Synthesis and structural characterization of four di­chlorido­bis­(cyclo­propyl­alkynyl­amidine)­metal complexes

Transition-metal amidine complexes of the type MCl₂[c-C₃H₅—C≡C—C(NR′)(NHR′)]₂ (M = Mn, Fe, Co) are readily available by a two-step synthesis starting from cyclo­proplacetyl­ene.

Abstract

Deliberate hydrolysis of lithium cyclo­propyl­alkynylamidinates, Li[c-C₃H₅—C≡C(NR′)₂] [R′ = ⁱPr, Cy = cyclo­hex­yl)], afforded the hitherto unknown neutral cyclo­propyl­alkynyl­amidine derivatives c-C₃H₅—C≡C—C(NR′)(NHR′) [R′ = ⁱPr (1), Cy (2)]. Subsequent reactions of 1 or 2 with metal(II) chlorides, MCl₂ (M = Mn, Fe, Co), provided the title complexes di­chlorido­bis­(3-cyclo­propyl-N,N′-diisopropyl­prop-2-ynamidine)­manganese(II), [MnCl₂(C₁₂H₂₀N₂)₂], (3), di­chlorido­bis­(3-cyclo­propyl-N,N′-diisopropyl­prop-2-ynamidine)­iron(II), [FeCl₂(C₁₂H₂₀N₂)₂], (4), di­chlorido­bis­(N,N′-di­cyclo­hexyl-3-cyclo­propyl­prop-2-ynamidine)­iron(II), [FeCl₂(C₁₈H₂₈N₂)₂], (5), and di­chlorido­bis­(N,N′-di­cyclo­hexyl-3-cyclo­propyl­prop-2-ynamidine)­cobalt(II), [CoCl₂(C₁₈H₂₈N₂)₂], (6), or more generally MCl₂[c-C₃H₅—C≡C—C(NR′)(NHR′)]₂ [R′ = ⁱPr, M = Mn (3), Fe (4); R′ = Cy, M = Fe (5), Co (6)] in moderate yields (30–39%). Besides their spectroscopic data (IR and MS) and elemental analyses, all complexes 3–6 were structurally characterized. The two isopropyl-substituted complexes 3 and 4 are isotypic, and so are the cyclo­hexyl-substituted complexes 5 and 6. In all cases, the central metal atom is coordinated by two Cl atoms and two N atoms in a distorted-tetra­hedral fashion, and the structure is supported by intra­molecular N—H⋯Cl hydrogen bonds.

Chemical context  

Over the past three decades, chelating anionic 1,3-di­aza­allyl-type ligands such as amidinates, [RC(NR′)₂]⁻, and guanidin­ates, [R ₂NC(NR′)₂]⁻, have gained tremendous importance in various fields of organometallic and coordination chemistry. These highly versatile N-chelating ligands are generally regarded as steric equivalents of the ubiquitous cyclo­penta­dienyl ligands (Collins, 2011 ▸; Edelmann, 2009 ▸, 2012 ▸, 2013 ▸). Unlike the closely related carboxyl­ate anions, [RCO₂]⁻, the steric properties of amidinate anions can be tuned in a wide range by introducing different substituents at all three atoms of the NCN 1,3-di­aza­allyl unit. A rather inter­esting and potentially useful variation of the amidinate group is the use of alkinyl groups at the central C atom. Alkinyl­amidines of the composition RC≡C—C(=NR′)(NR′) are of inter­est because of their applications in organic synthesis (Ong et al., 2006 ▸; Xu et al., 2008 ▸; Weingärtner & Maas, 2012 ▸) and in biological and pharmacological systems (Rowley et al., 2005 ▸; Sienkiewicz et al., 2005 ▸). Moreover, alkinylamidinate complexes of transition metals and lanthanides effectively catalyze the addition of C—H, N—H and P—H bonds to carbodi­imides as well as the polymerization of polar monomers such as ∊-caprolactone. Previously used alkynylamidinate anions have mainly included the C-phenyl and C-tri­methyl­silyl derivatives [R—C≡C—C(NR′)₂]⁻ (R = Ph, SiMe₃; R′ = ⁱPr, Cy; Dröse et al., 2010a ▸,b ▸; Seidel et al., 2012 ▸; Xu et al., 2013 ▸).

We recently began with an investigation of alkinylamidinate ligands and complexes derived from cyclo­propyl­acetyl­ene. The cyclo­propyl group was selected because of its well-established electron-donating ability to an adjacent electron-deficient center. This way it is possible to electronically modify the amidinate ligand system rather than just changing its steric demand. In a first study, we described the synthesis and characterization of a series of lithium cyclo­propyl­ethinyl­amidinates, Li[c-C₃H₅—C≡C—C(NR′)₂] [R′ = ⁱPr, Cy (= cyclo­hex­yl)], which are readily accessible on a large scale using commercially available starting materials (cyclo­propyl­acetyl­ene, N,N′-diorganocarbodi­imides; Sroor et al., 2013 ▸). Subsequently, these ligands have been employed for the preparation of new di- and trivalent lanthanide complexes (Sroor et al., 2015a ▸,b ▸,c ▸,d ▸, 2016 ▸; Wang et al., 2016 ▸). More recently, we became inter­ested in the chemistry of 3d metal complexes containing cyclo­propyl­ethinylamidinate ligands. In the course of this work, we occasionally observed and structurally characterized hydrolysis products of the composition MCl₂[c-C₃H₅—C≡C—C(NR′)(NHR′)] (M = Mn, Fe, Co; R′ = ⁱPr, Cy), which contain the neutral amidines c-C₃H₅-C≡C—C(NR′)(NHR′) as new ligands. Neutral amidines are highly versatile ligands in coordination chemistry in their own right (Barker & Kilner, 1994 ▸; Coles, 2006 ▸). We report here the deliberate synthesis of two new cylo­propyl­alkynyl­amidines, c-C₃H₅—C≡C—C(NR′)(NHR′) (R′ = ⁱPr, Cy) as well as the preparation and structural characterization of four first-row transition metal complexes of the type MCl₂[c-C₃H₅—C≡C—C(NR′)(NHR′)] (M = Mn, Fe, Co; R′ = ⁱPr, Cy).

The title compounds were first discovered serendipitously when studying reactions of anhydrous metal(II) chlorides MCl₂ (M = Mn, Fe, Co) with 2 equiv. of the lithium cyclo­propyl­ethinylamidinates, Li[c-C₃H₅—C≡C—C(NR′)₂] (R′ = ⁱPr, Cy) in THF solution. Occasionally, small amounts of well-formed crystals were obtained, which turned out (by X-ray diffraction studies) to be the aforementioned hydrolysis products MCl₂[c-C₃H₅—C≡C—C(NR′)(NHR′)] (M = Mn, Fe, Co; R′ = ⁱPr, Cy). We then decided to prepare these complexes in a deliberate manner. As illustrated in Fig. 1 ▸, the bottom-up synthesis starts with the readily available lithium cyclo­propyl­ethinylamidinates, Li[c-C₃H₅—C≡C—C(NR′)₂] (R′ = ⁱPr, Cy; Sroor et al., 2013 ▸), which were made by addition of c-C₃H₅—C≡C—Li (prepared in situ from cyclo­propyl­acetyl­ene and ⁿBuLi) to the carbodiimides R′—N=C=N—R′ (R = ⁱPr, Cy). The lithium amidinate inter­mediates were then carefully hydrolyzed under controlled conditions to afford the neutral amidines c-C₃H₅—C≡C—C(NR′)(NHR′) [R′ = ⁱPr (1), Cy (2)] in >70% isolated yields. Both compounds form yellow oils, which were characterized by the usual set of spectroscopic data (MS, ¹H NMR, ¹³C NMR, IR) and elemental analysis. With the free amidine ligands in hand, the metal complexes with first-row transition metals could easily be prepared by treatment of metal(II) chlorides MCl₂ (M = Mn, Fe, Co) with 2 equiv. of either 1 or 2 in THF solution. The manganese(II) complex 3 as well as the two iron(II) complexes 4 and 5 form colourless crystals, while the cobalt(II) complex 6 is blue. The compositions of all four products as 1:2 complexes were confirmed by elemental analyses. The title compounds 3–6 were also characterized by their IR and mass spectra. The mass spectra showed a number of readily inter­pretable peaks resulting e.g. from loss of one amidine ligand or one or both chlorine atoms. IR bands in the region above ca 3100 cm⁻¹ could be assigned to the ν(N—H) vibrations, while strong bands around 1570 cm⁻¹ were characteristic for the C=N double bond in the amidine ligands. In the far-infrared region, the M—Cl bands could be clearly assigned by comparison with literature values (Clark & Williams, 1965 ▸; Takemoto et al., 1974 ▸) and IR spectra of the respective anhydrous metal(II) chlorides, MCl₂ (M = Mn, Fe, Co; for details see the Synthesis and crystallization section).

Figure 1.

Bottom-up synthesis of the title compounds 3–6 starting from cyclo­propyl­acetyl­ene.

Structural commentary  

MnCl₂[c-C₃H₅—C≡C—C(NⁱPr)(NHⁱPr)]₂ (3; Fig. 2 ▸) and FeCl₂ [c-C₃H₅—C≡C—C(NⁱPr)(NHⁱPr)]₂ (4; Fig. 3 ▸) crystallize isotypic­ally in the ortho­rhom­bic space group Fdd2. The metal atom is situated on a crystallographic twofold axis and is surrounded by two symmetry-equivalent chlorido ligands and two symmetry-equivalent amidine ligands. The latter are attached to the metal atom in a monodentate κN mode via the non-protonated nitro­gen atom (N1). The N—H moiety is involved in an intra­molecular N—H⋯Cl bond (Tables 1 ▸ and 2 ▸). The crystal structures of FeCl₂[c-C₃H₅—C≡C—C(NCy)(NHCy)]₂ (5; Fig. 4 ▸) and CoCl₂[c-C₃H₅-C≡C—C(NCy)(NHCy)]₂ (6; Fig. 5 ▸) are isotypic in the monoclinic space group P2₁/c. In this case, the two amidine ligands are not symmetry-equivalent, but nonetheless the mol­ecular structures resemble those of 3 and 4.

Figure 2.

Mol­ecular structure of 3 in the crystal. Displacement ellipsoids are drawn at the 50% level, C-bound H atoms omitted for clarity. Symmetry code: (′) 1 − x, 1 − y, z.

Figure 3.

Mol­ecular structure of 4 in the crystal. Displacement ellipsoids are drawn at the 50% level, C-bound H atoms omitted for clarity. Symmetry code: (′) 1 − x, 1 − y, z.

Table 1. Hydrogen-bond geometry (Å, °) for 3 .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H1⋯Cl	0.85 (2)	2.36 (2)	3.197 (3)	170 (3)
C8—H9⋯Cli	0.98	2.88	3.776 (4)	152
C5—H4⋯Clii	0.99	2.95	3.931 (4)	172
C10—H14⋯Clii	1.00	2.93	3.643 (3)	129
C4—H2⋯Cliii	1.00	2.67	3.516 (3)	143

Symmetry codes: (i) ; (ii) ; (iii) .

Table 2. Hydrogen-bond geometry (Å, °) for 4 .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H1⋯Cl	0.87 (2)	2.32 (3)	3.175 (3)	169 (4)
C8—H9⋯Cli	0.98	2.84	3.728 (5)	151
C5—H4⋯Clii	0.99	2.98	3.963 (5)	172
C10—H14⋯Clii	1.00	2.98	3.679 (4)	128
C4—H2⋯Cliii	1.00	2.68	3.510 (4)	140

Symmetry codes: (i) ; (ii) ; (iii) .

Figure 4.

Mol­ecular structure of 5 in the crystal. Displacement ellipsoids are drawn at the 50% level, C-bound H atoms omitted for clarity.

Figure 5.

Mol­ecular structure of 6 in the crystal. Displacement ellipsoids are drawn at the 50% level, C-bound H atoms omitted for clarity.

Compound 3 represents a rare example of a complex of tetra-coordinated manganese with nitro­gen ligands, while a larger number of the corresponding iron and cobalt complexes are known. The Mn—N bond length in 3 is 2.160 (2) Å and therefore comparable with literature data (Handley et al., 2001 ▸; Wang, 2009 ▸). In the iron complexes, the Fe—N distances are very similar at 2.088 (3) Å (4), and 2.073 (2)–2.079 (2) Å (5). These values are in the range of Fe—N distances usually observed in MCl₂ L ₂-type complexes, where L is a ligand with an sp ²-hybridized nitro­gen donor (Benson et al., 2010 ▸; Xiao et al., 2011 ▸; Batcup et al., 2014 ▸). The same is true for the cobalt complex 6, having Co—N bond lengths of 2.041 (2) and 2.043 (2) Å (Riggio et al.; 2001 ▸; Jian et al., 2003 ▸; Xiao et al., 2011 ▸). The set of C—N bond lengths within the NCN group of the amidine ligands is virtually equal in 3–6, including one formal C=N double bond at 1.309 (2)–1.315 (4) Å, and one formal C—N single bond at 1.337 (4)–1.340 (2) Å. The small difference between single- and double-bond length may indicate some degree of delocalization of the π-electron density. The observed values are consistent with other metal complexes having metal-coordinated amidine moieties (Dröse et al., 2010a ▸,b ▸; Harmgarth et al., 2014 ▸, 2017a ▸,b ▸; Hillebrand et al., 2014 ▸). The hydrogen-bonded N⋯Cl separations are similar in 3–6, being in the narrow range of 3.175 (3)–3.251 (2) Å (Tables 1 ▸–4 ▸ ▸ ▸).

Table 3. Hydrogen-bond geometry (Å, °) for 5 .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H1⋯Cl2	0.84 (2)	2.42 (2)	3.2511 (19)	169 (2)
N4—H29⋯Cl1	0.85 (2)	2.41 (2)	3.2459 (18)	170 (2)
C22—H30⋯Cl1i	1.00	2.90	3.744 (3)	143
C35—H53⋯Cl1i	0.99	3.05	3.613 (2)	118
C28—H40⋯Cl2ii	0.99	2.91	3.699 (2)	138

Symmetry codes: (i) ; (ii) .

Table 4. Hydrogen-bond geometry (Å, °) for 6 .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H1⋯Cl2	0.85 (2)	2.37 (2)	3.1979 (16)	166 (2)
N4—H29⋯Cl1	0.86 (2)	2.35 (2)	3.1917 (15)	168 (2)
C22—H30⋯Cl1i	1.00	2.95	3.800 (2)	144
C33—H49⋯Cl1i	0.99	3.09	3.628 (2)	115
C28—H40⋯Cl2ii	0.99	2.96	3.758 (2)	139

Symmetry codes: (i) ; (ii) .

Supra­molecular features  

All four title compounds 3–6 display weak intra- and inter­molecular C—H⋯Cl contacts (Tables 1 ▸–4 ▸ ▸ ▸) involving the cyclo-propyl and iso-propyl or cyclo-hexyl groups, respectively.

Chemistry of related structures  

For reviews on the coordination chemistry of neutral amidines, see Barker & Kilner (1994 ▸) and Coles (2006 ▸).

Synthesis and crystallization  

General Procedures: All reactions were carried out in oven-dried or flame-dried glassware in an inert atmosphere of dry argon employing standard Schlenk and glovebox techniques. The solvent THF was distilled from sodium/benzo­phenone in a nitro­gen atmosphere prior to use. n-Butyl­lithium (1.6 M in hexa­nes) was purchased from Sigma–Aldrich. ¹H NMR (400 MHz) and ¹³C NMR (100.6 MHz) spectra were recorded in THF-d₈ solutions using a Bruker DPX 400 spectrometer at 298 K. Chemical shifts are referenced to tetra­methyl­silane. IR spectra were measured with a Bruker Vertex 70V spectrom­eter equipped with a diamond ATR unit between 4000 and 50 cm⁻¹. The relative intensities of the absorption bands are given as very strong (vs), strong (s), medium (m), weak (w) and shoulder (sh). Electron impact mass spectra were measured on a MAT95 spectrometer with an ionization energy of 70 eV. Microanalyses of the compounds were performed using a vario EL cube apparatus from Elementar Analysensysteme GmbH.

Synthesis of 3-cyclo­propyl- N,N′-diiso­propyl­propynamidine, c -C₃H₅—C≡C—C(N ⁱ Pr)(NH ⁱ Pr) (1): A THF (80 ml) solution of cyclo­propyl­acetyl­ene (4.2 ml, 50 mmol) in a Schlenk flask (250 ml) was cooled to 253 K and treated slowly with n-butyl­lithium (50 mmol, 1.6 M solution in hexa­nes). After 30 min, neat N,N′-diiso­propyl­carbodi­imide (7.8 ml, 50 mmol) was added and the mixture was stirred for 15 min at 253 K. The solution was warmed to room temperature and stirred for 1 h. During this time, the solution colour turned yellow. 20 ml of distilled water were added and stirring was continued for 30 min. The solution was separated using a separatory funnel and allowed to stand overnight after adding 3.0 g of anhydrous magnesium sulfate to remove the remaining water. The solvents were removed under vacuum to obtain 1 as a yellow oil. Yield: 6.9 g, 72%. Elemental analysis for C₁₂H₂₀N₂ (192.30 g mol⁻¹): C, 74.95; H, 10.48; N, 14.57; found C, 74.74; H, 10.46; N, 14.58. MS (EI, M = 192.30): m/z (%) 107.04 (10) [M – 2ⁱPr]⁺, 149.11 (68) [M − ⁱPr]⁺, 164.12 (47) [M − 2CH₃]⁺, 177.13 (100) [M − CH₃]⁺, 191.14 (43) [M]^{+. 1}H NMR (400.1 MHz, THF-d₈, 298 K): δ (ppm) 4.71–4.78 (br, 1H, NH, NHCN), 3.72–3.88 (s, 2H, CH, ⁱPr), 1.31–1.38 (m, 1H, CH, c-C₃H₅), 0.97–1.04 (d, 12H, CH ₃, ⁱPr), 0.79–0.84 (m, 4H, CH ₂, c-C₃H₅), 0.66–0.69 (m, 4H, CH ₂, c-C₃H₅). ¹³C NMR (100.6 MHz, THF-d₈, 298 K): δ (ppm) 140.5 (NHCN), 96.6 (CH—C≡C), 69.2 (C≡C—C), 67.8 (CH, ⁱPr), 26.8 (CH₃, ⁱPr), 9.83 (CH₂, c-C₃H₅), 0.37 (CH, c-C₃H₅). IR (ATR): ν (cm⁻¹) 3440 (w, N—H), 3415 (w, N—H), 3096 (w), 3014 (w), 2963 (s, C—H), 2931 (m), 2867 (m, C—H), 2614 (w), 2226 (m), 1606 (vs, N=C), 1487 (m), 1466 (m), 1453 (m), 1375 (m), 1360 (m), 1344 (m), 1317 (m), 1263 (m), 1178 (m), 1132 (m), 1088 (w), 1055 (w), 1031 (w), 970 (w), 943 (m), 880 (w), 849 (w), 812 (w), 685 (m), 616 (w), 472 (w), 424 (w), 254 (w), 105 (w), 71 (w), 60 (w).

Synthesis of 3-cyclo­propyl- N,N′-di­cyclo­hexyl­propyn­amid­ine, c -C₃H₅—C≡C—C(NCy)(NHCy) (2): A THF (100 ml) solution of cyclo­propyl­acetyl­ene (4.2 ml, 50 mmol) in a Schlenk flask (250 ml) was cooled to 253 K and treated slowly with n-butyl­lithium (50 mmol, 1.6 M solution in hexa­nes). After 30 min, N,N′-di­cyclo­hexyl­carbodi­imide (10.3 g, 50 mmol) was added and the rest of the reaction mixture was worked up as described for 1. The solvent was removed under vacuum to obtain 2 as a yellow oil. Yield: 10.1 g, 74%. Elemental analysis for C₁₈H₂₈N₂ (272.43 g mol⁻¹): C, 79.36; H, 10.36; N, 10.28; found C, 79.36; H, 10.30; N, 10.38. MS (EI, M = 272.40): m/z (%) 109.06 (19) [M − 2Cy]⁺, 189.13 (75) [M − Cy]⁺, 272.23 (79) [M]^{+. 1}H NMR (400.1 MHz, THF-d₈, 293 K): δ (ppm) 4.87–4.95 (s, 1H, NHCN), 1.69–1.06 (m, 20H, CH ₂, Cy), 1.40–1.34 (m, 1H, CH, c-C₃H₅), 0.79–0.86 (m, 2H, CH ₂, c-C₃H₅), 0.61–0.69 (m, 2H, CH ₂, c-C₃H₅). ¹³C NMR (100.6 MHz, THF-d₈, 298 K): δ (ppm) 141.5 (NHCN), 95.6 (CH—C≡C), 69.2 (C≡C—C), 64.5 (CH, Cy), 25.1–26.8 (CH₂, Cy), 8.83 (CH₂, c-C₃H₅), 0.37 (CH, c-C₃H₅). IR (ATR): ν (cm⁻¹) 3351 (w, N—H), 3062 (w), 2960 (vs, C—H), 2925 (s), 2866 (m, C—H), 2225 (w), 2116 (w), 1917 (w), 1855 (w), 1796 (w), 1661 (w), 1626 (m, N=C), 1601 (m), 1591 (m), 1530 (w), 1382 (m), 1361 (m), 1330 (m), 1314 (m), 1255 (s), 1177 (m), 1162 (m), 1146 (m), 1107 (m), 1058 (m), 1043 (m), 972 (w), 956 (w), 923 (m), 888 (w), 865 (w), 839 (w), 819 (m), 794 (s), 753 (vs), 706 (w), 678 (m), 622 (w), 601 (w), 577 (w), 527 (w), 519 (w), 465 (w), 441 (m), 416 (m), 326 (s), 275 (s), 169 (m), 152 (m), 114 (m), 88 (m), 57 (w).

Synthesis of di­chlorido­bis­(3-cyclo­propyl- N,N ′-diiso­propyl­prop-2-ynamidine)­manganese(II), MnCl₂[ c -C₃H₅—C≡C—C(N ⁱ Pr)(NH ⁱ Pr)]₂ (3): A solution of anhydrous MnCl₂ (0.33 g, 2.6 mmol) in 30 ml of THF was added to a solution of 1 (1.0 g, 5.2 mmol) in 50 ml of THF. The reaction mixture was heated to 333 K by water bath and stirred at room temperature for 12 h, resulting in a brown suspension. The filtrate was concentrated to ca 10 ml. Crystallization at r.t. afforded 3 as colourless crystals. Yield: 0.52 g, 39%. M.p. = 395 K. Elemental analysis for C₂₄H₄₀Cl₂MnN₄ (510.45 g mol⁻¹): C, 56.47; H, 7.90; N, 10.98; found C, 56.49; H, 7.93; N, 10.98. MS (EI, M = 510.45): m/z (%) 425.2 (50) [M − 2Cl − CH₃]⁺, 433.2 (2) [M − Cl – ⁱPr]⁺, 498.2 (100) [M − CH₂ + 2H]⁺. IR (ATR): ν (cm⁻¹) 3411 (w, N—H), 3239 (m, N—H), 3129 (w, N—H), 2967 (m), 2930 (w), 2872 (w), 2217 (s), 1628 (w), 1571 (vs, N=C), 1464 (s), 1432 (vs), 1382 (w), 1363 (m), 1330 (m), 1313 (m), 1243 (m), 1172 (m), 1132 (vs), 1061 (w), 1032 (w), 963 (s), 940 (w), 879 (w), 843 (m), 831 (m), 705 (s), 658 (m), 603 (w), 520 (w), 489 (w), 460 (w), 387 (w), 333 (m), 279 (vs, Mn—Cl), 207 (m), 173 (m), 128 (vs).

Synthesis of di­chlorido­bis­(3-cyclo­propyl- N,N ′-diiso­propyl­prop-2-ynamidine)­iron(II), FeCl₂[ c -C₃H₅—C≡C—C(N ⁱ Pr)(NH ⁱ Pr)]₂ (4): A solution of anhydrous FeCl₂ (0.33 g, 2.6 mmol) in 30 ml of THF was added to a solution of 1 (1.0 g, 5.2 mmol) in 50 ml of THF following the procedure given for 3. Crystallization at room temperature afforded 4 as colourless crystals. Yield: 0.40 g, 30%. M.p. = 400 K. Elemental analysis for C₂₄H₄₀Cl₂FeN₄ (511.35 g mol⁻¹): C, 56.37; H, 7.88; N, 10.96; found C, 56.34; H, 7.75; N, 10.98%. MS (EI, M = 511.35): m/z (%) 432.4 (100) [M − Cl − ⁱPr]⁺, 439.1 (40) [M − 2Cl]⁺, 475.4 (63) [M − Cl]⁺, 501.0 (100) [M − CH₂ + 2H]⁺. IR (ATR): ν (cm⁻¹) 3290 (w, N—H), 3222 (w, N—H), 3119 (w, N—H), 2976 (m, C—H), 2933 (w), 2874 (w, C—H), 2225 (m), 1619 (s), 1568 (m, N=C), 1485 (w), 1463 (w), 1429 (w), 1392 (w), 1372 (w), 1309 (w), 1244 (w), 1169 (m), 1129 (m), 1062 (w), 1033 (w), 963 (m), 939 (m), 879 (m), 846 (m), 818 (w), 793 (w), 709 (s), 691 (s), 649 (s), 599 (s), 520 (s), 460 (s), 353 (vs), 313 (vs), 280 (vs), 211 (vs, Fe—Cl), 134 (s), 68 (s).

Synthesis of di­chlorido­bis­( N,N ′-di­cyclo­hexyl-3-cyclo­prop­yl­prop-2-ynamidine)­iron(II), FeCl₂[ c -C₃H₅-C≡C—C(NCy)(NHCy)]₂ (5): A solution of anhydrous FeCl₂ (0.23 g, 1.8 mmol) in 30 ml of THF was added to a solution of 2 (1.0 g, 3.6 mmol) in 50 ml of THF. The reaction mixture was heated to 333 K by water bath and stirred at room temperature for 12 h, resulting in a brown suspension. The filtrate was concentrated to ca 10 ml. Crystallization at 278 K afforded 5 in the form of colorless crystals. Yield: 0.45 g, 37%. M.p. = 405 K. Elemental analysis for C₃₆H₅₆Cl₂FeN₄ (671.61 g mol⁻¹): C, 65.66; H, 8.21; N, 8.57; found C, 64.38; H, 8.40; N, 8.34%. MS (EI, M = 671.61): m/z (%) 363.17 (24) [M − c-C₃H₅—C≡C—C(NCy)(NHCy) − Cl]⁺, 457.08 (74) [M − 3C₃H₇ − C₆H₁₁]⁺, 540.13 (100) [M − 3C₃H₇]⁺. IR (ATR): ν (cm⁻¹) 3214 (w, N—H), 2928 (s, C—H), 2852 (s, C—H), 2227 (s), 1573 (vs, N=C), 1448 (s), 1365 (m), 1347 (w), 1308 (w), 1245 (m), 1188 (w), 1154 (w), 1062 (w), 1031 (w), 974 (m), 891 (w), 858 (w), 842 (w), 814 (w), 702 (m), 603 (w), 549 (w), 474 (w), 443 (w), 279 (s), 198 (vs, Fe—Cl), 140 (s), 121 (s), 107 (s), 89 (m).

Synthesis of di­chlorido­bis­( N,N ’-di­cyclo­hexyl-3-cyclo­propyl­prop-2-ynamidine)­cobalt(II), CoCl₂[ c -C₃H₅-C≡C—C(NCy)(NHCy)]₂CoCl₂ (6): A solution of anhydrous CoCl₂ (0.23 g, 1.8 mmol) in 30 ml of THF was added to a solution of 2 (1.0 g, 3.6 mmol) in 50 ml of THF following the procedure given for 5. Crystallization at 278 K afforded 6 in the form of blue crystals. Yield: 0.45 g, 37%. M.p. = 399 K. Elemental analysis for C₃₆H₅₆Cl₂CoN₄ (674.69 g mol⁻¹): C, 64.09; H, 8.37; N, 8.30; found C, 63.69; H, 8.31; N, 9.26%. MS (EI, M = 674.69): m/z (%) 402.23 (24) [M − c-C₃H₅—C≡C—C(NCy)(NHCy)]⁺, 461.32 (89) [M − 3C₃H₇ − C₆H₁₁]⁺, 544.39 (15) [M − 3C₃H₇]⁺. IR (ATR): ν (cm⁻¹) 3440 (w, N—H), 3212 (w, N—H), 3128 (w, N—H), 3090 (w), 3008 (w), 2925 (vs, C—H), 2850 (s, C—H), 2662 (w), 2228 (m), 1690 (w), 1635 (w), 1605 (m), 1575 (N=C), 1486 (m), 1447 (vs), 1433 (s), 1363 (s), 1346 (m), 1300 (w), 1257 (m), 1221 (w), 1188 (w), 1157 (w), 1090 (w), 1064 (m), 1031 (m), 973 (m), 889 (w), 858 (m), 841 (w), 815 (w), 788 (w), 701 (s), 656 (m), 549 (w), 475 (w), 444 (w), 430 (w), 392 (w), 349 (w), 292 (vs, Co—Cl), 228 (m), 204 (w), 166 (w), 127 (vs), 74 (w).

For comparison, the far infrared spectra of the anhydrous metal dichlorides MCl₂ (M = Mn, Fe, Co) were also measured:

IR (KBr): ν MnCl₂ (cm⁻¹) 1064 (w), 1230 (w), 492 (w), 434 (w), 318 (w), 163 (vs, Mn—Cl) , 83 (s), 64 (s).

IR (KBr): ν FeCl₂ (cm⁻¹) 3461 (w), 2977 (w), 2113 (w), 1993 (w), 1599 (w), 1389 (w), 1096 (w), 931 (w), 812 (w), 330 (w), 144 (vs, Fe—Cl), 54 (s).

IR (KBr): ν CoCl₂ (cm⁻¹) 1599 (w), 615 (w), 348 (w), 189 (vs, Co—Cl).

X-ray quality single crystals of complexes 3–6 were obtained at r.t. from concentrated solutions in THF.

Refinement  

Crystal data, data collection and structure refinement details are summarized in Table 5 ▸. H atoms attached to C atoms were fixed geometrically and refined using a riding model. The CH₃ groups in 3 and 4 were allowed to rotate freely around the C—C vector, the corresponding C—H distances were constrained to 0.98 Å. C—H distances within CH₂ groups were constrained to 0.99 Å, C—H distances within CH groups to 1.00 Å. H atoms attached to N atoms were located in the difference-Fourier map and refined, the N—H distances were restrained to 0.88 (2) Å. The U _iso(H) values were set at 1.5U _eq(C) for the methyl groups in 3 and 4, and at 1.2U _eq(X) (X = C, N) in all other cases. For 6, the reflections (011) and (002) disagreed strongly with the structural model and were therefore omitted from the refinement.

Table 5. Experimental details.

	3	4	5	6
Crystal data
Chemical formula	[MnCl2(C12H20N2)2]	[FeCl2(C12H20N2)2]	[FeCl2(C18H28N2)2]	[CoCl2(C18H28N2)2]
M r	510.44	511.35	671.59	674.67
Crystal system, space group	Orthorhombic, F d d2	Orthorhombic, F d d2	Monoclinic, P21/c	Monoclinic, P21/c
Temperature (K)	153	153	100	153
a, b, c (Å)	17.6701 (10), 30.9809 (19), 10.1452 (5)	17.5703 (9), 30.9167 (12), 10.1110 (6)	13.905 (7), 12.500 (6), 20.742 (11)	13.8898 (3), 12.5574 (3), 20.8394 (5)
α, β, γ (°)	90, 90, 90	90, 90, 90	90, 92.24 (4), 90	90, 91.717 (2), 90
V (Å3)	5553.8 (5)	5492.5 (5)	3603 (3)	3633.17 (15)
Z	8	8	4	4
Radiation type	Mo Kα	Mo Kα	Mo Kα	Mo Kα
μ (mm−1)	0.69	0.76	0.60	0.65
Crystal size (mm)	0.33 × 0.24 × 0.10	0.27 × 0.25 × 0.25	0.26 × 0.19 × 0.12	0.39 × 0.19 × 0.10
Data collection
Diffractometer	Stoe IPDS 2T	Stoe IPDS 2T	Stoe IPDS 2T	Stoe IPDS 2T
Absorption correction	Numerical X-AREA and X-RED (Stoe & Cie, 2002 ▸)	Numerical X-AREA and X-RED (Stoe & Cie, 2002 ▸)	Numerical X-AREA and X-RED (Stoe & Cie, 2002 ▸)	Numerical X-AREA and X-RED (Stoe & Cie, 2002 ▸)
T min, T max	0.851, 0.932	0.837, 0.888	0.838, 0.908	0.807, 0.938
No. of measured, independent and observed [I > 2σ(I)] reflections	5371, 2432, 2203	5377, 2495, 2239	18866, 7036, 6355	22018, 7124, 5922
R int	0.030	0.037	0.029	0.042
(sin θ/λ)max (Å−1)	0.617	0.616	0.617	0.617
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.026, 0.054, 0.98	0.033, 0.074, 1.01	0.033, 0.075, 1.14	0.035, 0.083, 1.03
No. of reflections	2432	2495	7036	7124
No. of parameters	148	148	395	394
No. of restraints	2	2	2	2
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement	H atoms treated by a mixture of independent and constrained refinement	H atoms treated by a mixture of independent and constrained refinement	H atoms treated by a mixture of independent and constrained refinement
Δρmax, Δρmin (e Å−3)	0.17, −0.16	0.21, −0.42	0.40, −0.33	0.65, −0.36
Absolute structure	Flack x determined using 804 quotients [(I +)−(I −)]/[(I +)+(I −)] (Parsons et al., 2013 ▸).	Flack x determined using 846 quotients [(I +)−(I −)]/[(I +)+(I −)] (Parsons et al., 2013 ▸).	–	–
Absolute structure parameter	0.005 (17)	−0.03 (3)	–	–

Computer programs: X-AREA X-AREA and X-RED (Stoe & Cie, 2002 ▸), SHELXT2014/5 (Sheldrick, 2015a ▸), SHELXL2018/3 (Sheldrick, 2015b ▸), DIAMOND (Brandenburg, 1999 ▸) and publCIF (Westrip, 2010 ▸).

Supplementary Material

CCDC references: 1848876, 1848879, 1848878, 1848877

Additional supporting information: crystallographic information; 3D view; checkCIF report

supplementary crystallographic information

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)manganese(II) (3) . Crystal data

[MnCl2(C12H20N2)2]	Dx = 1.221 Mg m−3
Mr = 510.44	Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, Fdd2	Cell parameters from 5371 reflections
a = 17.6701 (10) Å	θ = 2.4–26.0°
b = 30.9809 (19) Å	µ = 0.69 mm−1
c = 10.1452 (5) Å	T = 153 K
V = 5553.8 (5) Å3	Plate, colorless
Z = 8	0.33 × 0.24 × 0.10 mm
F(000) = 2168

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)manganese(II) (3) . Data collection

Stoe IPDS 2T diffractometer	2432 independent reflections
Radiation source: fine-focus sealed tube	2203 reflections with I > 2σ(I)
Detector resolution: 6.67 pixels mm-1	Rint = 0.030
area detector scans	θmax = 26.0°, θmin = 2.4°
Absorption correction: numerical X-Area and X-Red (Stoe & Cie, 2002)	h = −21→19
Tmin = 0.851, Tmax = 0.932	k = −38→36
5371 measured reflections	l = −10→12

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)manganese(II) (3) . Refinement

Refinement on F2	Hydrogen site location: mixed
Least-squares matrix: full	H atoms treated by a mixture of independent and constrained refinement
R[F2 > 2σ(F2)] = 0.026	w = 1/[σ2(Fo2) + (0.0295P)2] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.054	(Δ/σ)max < 0.001
S = 0.98	Δρmax = 0.17 e Å−3
2432 reflections	Δρmin = −0.16 e Å−3
148 parameters	Absolute structure: Flack x determined using 804 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013).
2 restraints	Absolute structure parameter: 0.005 (17)
Primary atom site location: dual

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)manganese(II) (3) . Special details

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)manganese(II) (3) . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
C1	0.36882 (15)	0.54929 (8)	0.4904 (3)	0.0249 (6)
C2	0.33550 (15)	0.58031 (8)	0.5793 (3)	0.0275 (6)
C3	0.30913 (16)	0.60729 (9)	0.6494 (3)	0.0302 (7)
C4	0.28074 (18)	0.63992 (9)	0.7356 (3)	0.0356 (7)
H2	0.319053	0.653154	0.795855	0.043*
C5	0.20206 (19)	0.63718 (12)	0.7899 (4)	0.0499 (9)
H4	0.170588	0.612238	0.763079	0.060*
H3	0.193744	0.647216	0.881390	0.060*
C6	0.2193 (2)	0.66970 (11)	0.6900 (4)	0.0533 (10)
H5	0.221801	0.700214	0.718620	0.064*
H6	0.198644	0.665236	0.600306	0.064*
C7	0.48948 (16)	0.58097 (9)	0.5311 (3)	0.0306 (7)
H7	0.459936	0.594392	0.604475	0.037*
C8	0.5092 (2)	0.61607 (9)	0.4321 (4)	0.0483 (9)
H8	0.462550	0.629138	0.398310	0.072*
H9	0.537769	0.603441	0.358799	0.072*
H10	0.539979	0.638262	0.475250	0.072*
C9	0.55984 (19)	0.56063 (11)	0.5888 (5)	0.0523 (10)
H11	0.545423	0.536465	0.645823	0.078*
H12	0.587472	0.582183	0.640576	0.078*
H13	0.592242	0.550058	0.517331	0.078*
C10	0.24079 (15)	0.51535 (9)	0.4664 (3)	0.0309 (6)
H14	0.231615	0.528595	0.554861	0.037*
C11	0.1891 (2)	0.53643 (15)	0.3699 (5)	0.0730 (14)
H15	0.198631	0.567589	0.368767	0.110*
H16	0.136417	0.531090	0.395577	0.110*
H17	0.198092	0.524486	0.281836	0.110*
C12	0.2262 (2)	0.46796 (10)	0.4771 (5)	0.0589 (11)
H18	0.263622	0.454904	0.536161	0.088*
H19	0.230123	0.454725	0.389606	0.088*
H20	0.175270	0.463185	0.512437	0.088*
Cl	0.40889 (4)	0.46957 (2)	0.20903 (8)	0.03750 (19)
N1	0.44187 (12)	0.54779 (6)	0.4682 (2)	0.0244 (5)
N2	0.32035 (14)	0.52226 (8)	0.4319 (3)	0.0329 (6)
H1	0.3386 (17)	0.5071 (10)	0.370 (3)	0.039*
Mn	0.500000	0.500000	0.35079 (6)	0.02229 (14)

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)manganese(II) (3) . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
C1	0.0270 (13)	0.0210 (12)	0.0267 (16)	0.0043 (11)	0.0022 (12)	−0.0021 (10)
C2	0.0233 (13)	0.0260 (13)	0.0333 (18)	−0.0001 (11)	0.0014 (13)	−0.0054 (12)
C3	0.0241 (14)	0.0314 (14)	0.0350 (17)	−0.0011 (12)	0.0005 (13)	−0.0042 (12)
C4	0.0299 (15)	0.0393 (15)	0.038 (2)	0.0014 (12)	0.0019 (15)	−0.0162 (14)
C5	0.0372 (19)	0.056 (2)	0.057 (2)	−0.0006 (17)	0.0173 (18)	−0.0191 (17)
C6	0.054 (2)	0.052 (2)	0.055 (3)	0.0212 (17)	0.0009 (19)	−0.0145 (18)
C7	0.0229 (15)	0.0293 (14)	0.0396 (18)	0.0019 (12)	0.0027 (13)	−0.0124 (12)
C8	0.045 (2)	0.0315 (15)	0.068 (3)	−0.0095 (14)	0.0084 (19)	−0.0053 (15)
C9	0.0413 (17)	0.0463 (17)	0.069 (3)	0.0074 (15)	−0.020 (2)	−0.024 (2)
C10	0.0228 (14)	0.0325 (13)	0.0372 (18)	0.0001 (11)	0.0046 (15)	−0.0029 (12)
C11	0.0348 (18)	0.099 (3)	0.085 (4)	0.014 (2)	0.005 (2)	0.044 (3)
C12	0.0396 (18)	0.0394 (17)	0.098 (4)	−0.0071 (15)	0.008 (2)	0.005 (2)
Cl	0.0345 (4)	0.0426 (4)	0.0354 (4)	0.0088 (3)	−0.0083 (4)	−0.0170 (3)
N1	0.0231 (11)	0.0225 (10)	0.0276 (14)	0.0023 (8)	0.0001 (11)	−0.0048 (10)
N2	0.0239 (12)	0.0346 (12)	0.0402 (17)	−0.0013 (10)	0.0060 (11)	−0.0183 (11)
Mn	0.0229 (3)	0.0206 (2)	0.0234 (3)	0.0048 (3)	0.000	0.000

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)manganese(II) (3) . Geometric parameters (Å, º)

C1—N1	1.311 (3)	C8—H9	0.9800
C1—N2	1.337 (4)	C8—H10	0.9800
C1—C2	1.444 (4)	C9—H11	0.9800
C2—C3	1.192 (4)	C9—H12	0.9800
C3—C4	1.428 (4)	C9—H13	0.9800
C4—C5	1.498 (4)	C10—N2	1.465 (3)
C4—C6	1.498 (5)	C10—C11	1.491 (5)
C4—H2	1.0000	C10—C12	1.494 (4)
C5—C6	1.461 (6)	C10—H14	1.0000
C5—H4	0.9900	C11—H15	0.9800
C5—H3	0.9900	C11—H16	0.9800
C6—H5	0.9900	C11—H17	0.9800
C6—H6	0.9900	C12—H18	0.9800
C7—N1	1.473 (3)	C12—H19	0.9800
C7—C9	1.512 (4)	C12—H20	0.9800
C7—C8	1.521 (5)	Cl—Mn	2.3556 (8)
C7—H7	1.0000	N1—Mn	2.160 (2)
C8—H8	0.9800	N2—H1	0.85 (2)
N1—C1—N2	122.2 (2)	C7—C9—H12	109.5
N1—C1—C2	122.2 (2)	H11—C9—H12	109.5
N2—C1—C2	115.7 (2)	C7—C9—H13	109.5
C3—C2—C1	177.2 (3)	H11—C9—H13	109.5
C2—C3—C4	177.5 (3)	H12—C9—H13	109.5
C3—C4—C5	120.7 (3)	N2—C10—C11	111.6 (3)
C3—C4—C6	120.1 (3)	N2—C10—C12	109.1 (2)
C5—C4—C6	58.4 (2)	C11—C10—C12	111.9 (3)
C3—C4—H2	115.3	N2—C10—H14	108.1
C5—C4—H2	115.3	C11—C10—H14	108.1
C6—C4—H2	115.3	C12—C10—H14	108.1
C6—C5—C4	60.8 (2)	C10—C11—H15	109.5
C6—C5—H4	117.7	C10—C11—H16	109.5
C4—C5—H4	117.7	H15—C11—H16	109.5
C6—C5—H3	117.7	C10—C11—H17	109.5
C4—C5—H3	117.7	H15—C11—H17	109.5
H4—C5—H3	114.8	H16—C11—H17	109.5
C5—C6—C4	60.8 (2)	C10—C12—H18	109.5
C5—C6—H5	117.7	C10—C12—H19	109.5
C4—C6—H5	117.7	H18—C12—H19	109.5
C5—C6—H6	117.7	C10—C12—H20	109.5
C4—C6—H6	117.7	H18—C12—H20	109.5
H5—C6—H6	114.8	H19—C12—H20	109.5
N1—C7—C9	110.3 (2)	C1—N1—C7	117.6 (2)
N1—C7—C8	110.1 (3)	C1—N1—Mn	125.95 (18)
C9—C7—C8	111.4 (3)	C7—N1—Mn	116.44 (16)
N1—C7—H7	108.3	C1—N2—C10	126.9 (2)
C9—C7—H7	108.3	C1—N2—H1	116 (2)
C8—C7—H7	108.3	C10—N2—H1	117 (2)
C7—C8—H8	109.5	N1—Mn—N1i	113.06 (13)
C7—C8—H9	109.5	N1—Mn—Cl	106.62 (6)
H8—C8—H9	109.5	N1i—Mn—Cl	112.79 (6)
C7—C8—H10	109.5	N1—Mn—Cli	112.80 (6)
H8—C8—H10	109.5	N1i—Mn—Cli	106.62 (6)
H9—C8—H10	109.5	Cl—Mn—Cli	104.74 (5)
C7—C9—H11	109.5
C3—C4—C5—C6	−108.6 (4)	C8—C7—N1—C1	−100.7 (3)
C3—C4—C6—C5	109.7 (3)	C9—C7—N1—Mn	−42.7 (3)
N2—C1—N1—C7	176.0 (3)	C8—C7—N1—Mn	80.7 (2)
C2—C1—N1—C7	−3.8 (4)	N1—C1—N2—C10	167.7 (3)
N2—C1—N1—Mn	−5.5 (4)	C2—C1—N2—C10	−12.5 (4)
C2—C1—N1—Mn	174.66 (19)	C11—C10—N2—C1	104.8 (4)
C9—C7—N1—C1	135.9 (3)	C12—C10—N2—C1	−131.2 (3)

Symmetry code: (i) −x+1, −y+1, z.

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)manganese(II) (3) . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N2—H1···Cl	0.85 (2)	2.36 (2)	3.197 (3)	170 (3)
C8—H9···Cli	0.98	2.88	3.776 (4)	152
C5—H4···Clii	0.99	2.95	3.931 (4)	172
C10—H14···Clii	1.00	2.93	3.643 (3)	129
C4—H2···Cliii	1.00	2.67	3.516 (3)	143

Symmetry codes: (i) −x+1, −y+1, z; (ii) −x+1/2, −y+1, z+1/2; (iii) −x+3/4, y+1/4, z+3/4.

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)iron(II) (4) . Crystal data

[FeCl2(C12H20N2)2]	Dx = 1.237 Mg m−3
Mr = 511.35	Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, Fdd2	Cell parameters from 5377 reflections
a = 17.5703 (9) Å	θ = 2.4–26.0°
b = 30.9167 (12) Å	µ = 0.76 mm−1
c = 10.1110 (6) Å	T = 153 K
V = 5492.5 (5) Å3	Block, colorless
Z = 8	0.27 × 0.25 × 0.25 mm
F(000) = 2176

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)iron(II) (4) . Data collection

Stoe IPDS 2T diffractometer	2495 independent reflections
Radiation source: fine-focus sealed tube	2239 reflections with I > 2σ(I)
Detector resolution: 6.67 pixels mm-1	Rint = 0.037
area detector scans	θmax = 26.0°, θmin = 2.4°
Absorption correction: numerical X-Area and X-Red (Stoe & Cie, 2002)	h = −20→21
Tmin = 0.837, Tmax = 0.888	k = −38→36
5377 measured reflections	l = −10→12

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)iron(II) (4) . Refinement

Refinement on F2	Hydrogen site location: mixed
Least-squares matrix: full	H atoms treated by a mixture of independent and constrained refinement
R[F2 > 2σ(F2)] = 0.033	w = 1/[σ2(Fo2) + (0.045P)2] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.074	(Δ/σ)max < 0.001
S = 1.01	Δρmax = 0.21 e Å−3
2495 reflections	Δρmin = −0.42 e Å−3
148 parameters	Absolute structure: Flack x determined using 846 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013).
2 restraints	Absolute structure parameter: −0.03 (3)
Primary atom site location: dual

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)iron(II) (4) . Special details

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)iron(II) (4) . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
C1	0.3709 (2)	0.54820 (11)	0.4918 (4)	0.0256 (7)
C2	0.3378 (2)	0.57953 (11)	0.5794 (4)	0.0295 (8)
C3	0.3110 (2)	0.60671 (12)	0.6491 (4)	0.0311 (8)
C4	0.2823 (2)	0.63943 (13)	0.7355 (4)	0.0370 (9)
H2	0.320708	0.652558	0.796514	0.044*
C5	0.2031 (3)	0.63654 (17)	0.7896 (5)	0.0516 (12)
H4	0.171514	0.611617	0.761998	0.062*
H3	0.194600	0.646416	0.881537	0.062*
C6	0.2208 (3)	0.66945 (15)	0.6897 (5)	0.0506 (12)
H5	0.223392	0.699970	0.718986	0.061*
H6	0.200305	0.665170	0.599444	0.061*
C7	0.4920 (2)	0.58015 (12)	0.5319 (4)	0.0309 (8)
H7	0.462208	0.593479	0.605717	0.037*
C8	0.5106 (3)	0.61521 (13)	0.4324 (6)	0.0506 (12)
H8	0.463312	0.628650	0.401441	0.076*
H9	0.537663	0.602488	0.357185	0.076*
H10	0.542756	0.637176	0.474331	0.076*
C9	0.5635 (2)	0.56028 (15)	0.5897 (6)	0.0531 (13)
H11	0.549567	0.536538	0.649137	0.080*
H12	0.591635	0.582334	0.639198	0.080*
H13	0.595472	0.549128	0.517965	0.080*
C10	0.24171 (19)	0.51490 (12)	0.4677 (4)	0.0313 (8)
H14	0.232841	0.527648	0.557256	0.038*
C11	0.1912 (3)	0.5375 (2)	0.3711 (7)	0.0717 (17)
H15	0.204279	0.568265	0.368259	0.108*
H16	0.137983	0.534183	0.398571	0.108*
H17	0.198034	0.524779	0.283094	0.108*
C12	0.2255 (3)	0.46742 (15)	0.4745 (7)	0.0597 (14)
H18	0.261781	0.453556	0.534649	0.090*
H19	0.230443	0.454738	0.386081	0.090*
H20	0.173590	0.462874	0.507208	0.090*
Cl	0.41255 (5)	0.47033 (3)	0.20952 (10)	0.0389 (3)
N1	0.44457 (15)	0.54633 (9)	0.4699 (3)	0.0251 (6)
N2	0.32222 (17)	0.52105 (11)	0.4330 (4)	0.0323 (7)
H1	0.341 (2)	0.5058 (13)	0.369 (4)	0.039*
Fe	0.500000	0.500000	0.35458 (7)	0.02332 (17)

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)iron(II) (4) . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
C1	0.0283 (17)	0.0242 (16)	0.0243 (19)	0.0046 (15)	0.0015 (14)	−0.0018 (14)
C2	0.0241 (17)	0.0299 (18)	0.035 (2)	0.0018 (15)	−0.0011 (15)	−0.0040 (16)
C3	0.0289 (19)	0.0305 (19)	0.034 (2)	−0.0010 (17)	0.0009 (16)	−0.0044 (16)
C4	0.0326 (19)	0.040 (2)	0.038 (2)	0.0020 (17)	0.0027 (17)	−0.0109 (18)
C5	0.041 (2)	0.062 (3)	0.051 (3)	−0.001 (2)	0.016 (2)	−0.020 (2)
C6	0.051 (3)	0.053 (3)	0.047 (3)	0.021 (2)	0.001 (2)	−0.013 (2)
C7	0.0254 (19)	0.0298 (19)	0.038 (2)	0.0034 (16)	−0.0001 (16)	−0.0123 (15)
C8	0.048 (3)	0.033 (2)	0.071 (3)	−0.0063 (19)	0.011 (2)	−0.005 (2)
C9	0.041 (2)	0.051 (2)	0.067 (4)	0.008 (2)	−0.023 (2)	−0.024 (3)
C10	0.0236 (17)	0.0345 (18)	0.036 (2)	−0.0011 (15)	0.0012 (17)	−0.0033 (16)
C11	0.037 (2)	0.099 (4)	0.080 (4)	0.016 (3)	0.001 (3)	0.039 (4)
C12	0.039 (2)	0.043 (2)	0.097 (5)	−0.010 (2)	0.002 (3)	0.001 (3)
Cl	0.0359 (5)	0.0484 (5)	0.0324 (5)	0.0061 (4)	−0.0068 (4)	−0.0161 (4)
N1	0.0225 (13)	0.0273 (14)	0.0257 (16)	0.0020 (12)	0.0005 (12)	−0.0032 (13)
N2	0.0243 (15)	0.0359 (16)	0.037 (2)	−0.0002 (13)	0.0039 (13)	−0.0130 (13)
Fe	0.0243 (3)	0.0243 (3)	0.0214 (3)	0.0044 (3)	0.000	0.000

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)iron(II) (4) . Geometric parameters (Å, º)

C1—N1	1.315 (4)	C8—H9	0.9800
C1—N2	1.337 (5)	C8—H10	0.9800
C1—C2	1.435 (5)	C9—H11	0.9800
C2—C3	1.193 (5)	C9—H12	0.9800
C3—C4	1.429 (5)	C9—H13	0.9800
C4—C5	1.497 (6)	C10—N2	1.470 (4)
C4—C6	1.498 (6)	C10—C11	1.493 (6)
C4—H2	1.0000	C10—C12	1.497 (6)
C5—C6	1.467 (7)	C10—H14	1.0000
C5—H4	0.9900	C11—H15	0.9800
C5—H3	0.9900	C11—H16	0.9800
C6—H5	0.9900	C11—H17	0.9800
C6—H6	0.9900	C12—H18	0.9800
C7—N1	1.477 (5)	C12—H19	0.9800
C7—C8	1.514 (6)	C12—H20	0.9800
C7—C9	1.515 (6)	Cl—Fe	2.3139 (10)
C7—H7	1.0000	N1—Fe	2.088 (3)
C8—H8	0.9800	N2—H1	0.87 (2)
N1—C1—N2	121.8 (3)	C7—C9—H12	109.5
N1—C1—C2	122.1 (3)	H11—C9—H12	109.5
N2—C1—C2	116.1 (3)	C7—C9—H13	109.5
C3—C2—C1	177.6 (4)	H11—C9—H13	109.5
C2—C3—C4	177.3 (4)	H12—C9—H13	109.5
C3—C4—C5	120.6 (4)	N2—C10—C11	110.8 (4)
C3—C4—C6	120.3 (4)	N2—C10—C12	108.7 (3)
C5—C4—C6	58.6 (3)	C11—C10—C12	112.0 (4)
C3—C4—H2	115.2	N2—C10—H14	108.4
C5—C4—H2	115.2	C11—C10—H14	108.4
C6—C4—H2	115.2	C12—C10—H14	108.4
C6—C5—C4	60.7 (3)	C10—C11—H15	109.5
C6—C5—H4	117.7	C10—C11—H16	109.5
C4—C5—H4	117.7	H15—C11—H16	109.5
C6—C5—H3	117.7	C10—C11—H17	109.5
C4—C5—H3	117.7	H15—C11—H17	109.5
H4—C5—H3	114.8	H16—C11—H17	109.5
C5—C6—C4	60.7 (3)	C10—C12—H18	109.5
C5—C6—H5	117.7	C10—C12—H19	109.5
C4—C6—H5	117.7	H18—C12—H19	109.5
C5—C6—H6	117.7	C10—C12—H20	109.5
C4—C6—H6	117.7	H18—C12—H20	109.5
H5—C6—H6	114.8	H19—C12—H20	109.5
N1—C7—C8	110.2 (3)	C1—N1—C7	116.9 (3)
N1—C7—C9	110.1 (3)	C1—N1—Fe	125.7 (2)
C8—C7—C9	111.6 (4)	C7—N1—Fe	117.4 (2)
N1—C7—H7	108.3	C1—N2—C10	126.2 (3)
C8—C7—H7	108.3	C1—N2—H1	115 (3)
C9—C7—H7	108.3	C10—N2—H1	118 (3)
C7—C8—H8	109.5	N1i—Fe—N1	112.13 (17)
C7—C8—H9	109.5	N1i—Fe—Cl	113.06 (9)
H8—C8—H9	109.5	N1—Fe—Cl	108.42 (8)
C7—C8—H10	109.5	N1i—Fe—Cli	108.42 (8)
H8—C8—H10	109.5	N1—Fe—Cli	113.06 (9)
H9—C8—H10	109.5	Cl—Fe—Cli	101.32 (6)
C7—C9—H11	109.5
C3—C4—C5—C6	−109.0 (5)	C9—C7—N1—C1	137.1 (4)
C3—C4—C6—C5	109.5 (4)	C8—C7—N1—Fe	80.4 (3)
N2—C1—N1—C7	175.2 (3)	C9—C7—N1—Fe	−43.2 (4)
C2—C1—N1—C7	−4.4 (5)	N1—C1—N2—C10	168.1 (4)
N2—C1—N1—Fe	−4.5 (5)	C2—C1—N2—C10	−12.3 (6)
C2—C1—N1—Fe	175.9 (3)	C11—C10—N2—C1	102.8 (5)
C8—C7—N1—C1	−99.4 (4)	C12—C10—N2—C1	−133.6 (5)

Symmetry code: (i) −x+1, −y+1, z.

Dichloridobis(3-cyclopropyl-N,N'-diisopropylprop-2-ynamidine)iron(II) (4) . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N2—H1···Cl	0.87 (2)	2.32 (3)	3.175 (3)	169 (4)
C8—H9···Cli	0.98	2.84	3.728 (5)	151
C5—H4···Clii	0.99	2.98	3.963 (5)	172
C10—H14···Clii	1.00	2.98	3.679 (4)	128
C4—H2···Cliii	1.00	2.68	3.510 (4)	140

Symmetry codes: (i) −x+1, −y+1, z; (ii) −x+1/2, −y+1, z+1/2; (iii) −x+3/4, y+1/4, z+3/4.

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)iron(II) (5) . Crystal data

[FeCl2(C18H28N2)2]	F(000) = 1440
Mr = 671.59	Dx = 1.238 Mg m−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
a = 13.905 (7) Å	Cell parameters from 17648 reflections
b = 12.500 (6) Å	θ = 1.9–25.4°
c = 20.742 (11) Å	µ = 0.60 mm−1
β = 92.24 (4)°	T = 100 K
V = 3603 (3) Å3	Plate, colorless
Z = 4	0.26 × 0.19 × 0.12 mm

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)iron(II) (5) . Data collection

Stoe IPDS 2T diffractometer	7036 independent reflections
Radiation source: fine-focus sealed tube	6355 reflections with I > 2σ(I)
Detector resolution: 6.67 pixels mm-1	Rint = 0.029
area detector scans	θmax = 26.0°, θmin = 1.9°
Absorption correction: numerical X-Area and X-Red (Stoe & Cie, 2002)	h = −17→16
Tmin = 0.838, Tmax = 0.908	k = −14→15
18866 measured reflections	l = −25→25

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)iron(II) (5) . Refinement

Refinement on F2	Hydrogen site location: mixed
Least-squares matrix: full	H atoms treated by a mixture of independent and constrained refinement
R[F2 > 2σ(F2)] = 0.033	w = 1/[σ2(Fo2) + (0.0293P)2 + 1.8416P] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.075	(Δ/σ)max = 0.001
S = 1.14	Δρmax = 0.40 e Å−3
7036 reflections	Δρmin = −0.33 e Å−3
395 parameters	Extinction correction: SHELXL-2018/3 (Sheldrick 2015b), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
2 restraints	Extinction coefficient: 0.0028 (4)
Primary atom site location: dual

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)iron(II) (5) . Special details

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)iron(II) (5) . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
C1	0.18374 (11)	0.73239 (12)	0.51035 (7)	0.0161 (3)
C2	0.18720 (11)	0.66376 (13)	0.45462 (7)	0.0168 (3)
C3	0.19066 (11)	0.60813 (13)	0.40810 (7)	0.0170 (3)
C4	0.19602 (12)	0.54251 (13)	0.35178 (8)	0.0177 (3)
H2	0.139809	0.546681	0.320304	0.021*
C5	0.24578 (12)	0.43512 (13)	0.35720 (8)	0.0212 (3)
H3	0.273324	0.413811	0.400026	0.025*
H4	0.219025	0.375546	0.330658	0.025*
C6	0.29280 (13)	0.52459 (14)	0.32327 (8)	0.0244 (4)
H5	0.295258	0.520379	0.275701	0.029*
H6	0.349545	0.558635	0.345053	0.029*
C7	0.34866 (11)	0.69174 (12)	0.53244 (7)	0.0155 (3)
H7	0.331881	0.624187	0.508755	0.019*
C8	0.40490 (12)	0.76358 (13)	0.48786 (8)	0.0194 (3)
H8	0.420275	0.831957	0.510038	0.023*
H9	0.364745	0.779817	0.448615	0.023*
C9	0.49799 (12)	0.70959 (15)	0.46867 (8)	0.0231 (4)
H10	0.482171	0.646833	0.441134	0.028*
H11	0.535678	0.760259	0.443040	0.028*
C10	0.55896 (12)	0.67335 (16)	0.52738 (8)	0.0261 (4)
H12	0.614416	0.631283	0.512864	0.031*
H13	0.584414	0.736967	0.550800	0.031*
C11	0.50120 (12)	0.60571 (14)	0.57284 (8)	0.0214 (3)
H14	0.541338	0.589208	0.612053	0.026*
H15	0.483612	0.537232	0.551501	0.026*
C12	0.41006 (11)	0.66312 (13)	0.59209 (7)	0.0173 (3)
H16	0.372995	0.616336	0.620556	0.021*
H17	0.427449	0.729027	0.616312	0.021*
C13	0.01049 (11)	0.75831 (13)	0.48221 (7)	0.0171 (3)
H18	0.026349	0.739901	0.436925	0.020*
C14	−0.05565 (12)	0.85514 (13)	0.47973 (8)	0.0196 (3)
H19	−0.023073	0.915540	0.458747	0.024*
H20	−0.070252	0.877139	0.524145	0.024*
C15	−0.14923 (12)	0.82858 (14)	0.44199 (8)	0.0210 (3)
H21	−0.193205	0.890760	0.443257	0.025*
H22	−0.135037	0.814825	0.396327	0.025*
C16	−0.19864 (12)	0.73113 (15)	0.46954 (8)	0.0234 (4)
H23	−0.256468	0.713587	0.442226	0.028*
H24	−0.219839	0.747881	0.513424	0.028*
C17	−0.13164 (13)	0.63472 (14)	0.47271 (9)	0.0246 (4)
H25	−0.116038	0.612820	0.428457	0.030*
H26	−0.164296	0.574063	0.493383	0.030*
C18	−0.03899 (12)	0.66161 (13)	0.51117 (8)	0.0225 (3)
H27	−0.054045	0.677124	0.556482	0.027*
H28	0.004969	0.599326	0.511027	0.027*
C19	0.34950 (11)	0.72475 (12)	0.75081 (7)	0.0143 (3)
C20	0.35781 (11)	0.64968 (12)	0.80354 (7)	0.0165 (3)
C21	0.35957 (11)	0.58263 (13)	0.84443 (7)	0.0179 (3)
C22	0.35866 (13)	0.50039 (14)	0.89235 (8)	0.0246 (4)
H30	0.422855	0.471409	0.907068	0.030*
C23	0.28235 (16)	0.50218 (17)	0.94202 (9)	0.0337 (4)
H31	0.300638	0.477198	0.986107	0.040*
H32	0.235451	0.561790	0.940136	0.040*
C24	0.27579 (14)	0.42104 (15)	0.88987 (9)	0.0289 (4)
H33	0.225023	0.430424	0.855535	0.035*
H34	0.290246	0.345786	0.901532	0.035*
C25	0.19047 (11)	0.65995 (12)	0.72937 (7)	0.0161 (3)
H35	0.217077	0.593327	0.749938	0.019*
C26	0.12855 (12)	0.71616 (14)	0.77799 (8)	0.0212 (3)
H36	0.167993	0.731520	0.817682	0.025*
H37	0.105625	0.785192	0.759745	0.025*
C27	0.04233 (13)	0.64810 (16)	0.79503 (8)	0.0278 (4)
H38	0.001660	0.688525	0.824667	0.033*
H39	0.065054	0.582447	0.817556	0.033*
C28	−0.01730 (12)	0.61746 (16)	0.73466 (8)	0.0263 (4)
H40	−0.071153	0.570605	0.746631	0.032*
H41	−0.044864	0.682696	0.714150	0.032*
C29	0.04498 (12)	0.55937 (14)	0.68713 (8)	0.0226 (4)
H42	0.005834	0.541935	0.647639	0.027*
H43	0.068426	0.491401	0.706556	0.027*
C30	0.13082 (11)	0.62796 (13)	0.66927 (7)	0.0173 (3)
H44	0.171569	0.587352	0.639778	0.021*
H45	0.107523	0.693073	0.646411	0.021*
C31	0.51602 (11)	0.78749 (12)	0.78087 (7)	0.0154 (3)
H46	0.501379	0.770673	0.826590	0.018*
C32	0.55969 (12)	0.89931 (13)	0.77874 (8)	0.0198 (3)
H47	0.514586	0.951259	0.797183	0.024*
H48	0.569124	0.919683	0.733302	0.024*
C33	0.65602 (12)	0.90446 (13)	0.81646 (8)	0.0212 (3)
H49	0.684691	0.976251	0.811104	0.025*
H50	0.645231	0.893817	0.862918	0.025*
C34	0.72569 (12)	0.82016 (14)	0.79387 (8)	0.0220 (3)
H51	0.785401	0.822357	0.821440	0.026*
H52	0.742891	0.835846	0.748973	0.026*
C35	0.68131 (12)	0.70902 (14)	0.79694 (8)	0.0223 (4)
H53	0.669835	0.690603	0.842419	0.027*
H54	0.726701	0.655847	0.780054	0.027*
C36	0.58615 (12)	0.70403 (13)	0.75741 (8)	0.0211 (3)
H55	0.598301	0.716785	0.711324	0.025*
H56	0.557596	0.631888	0.761341	0.025*
N1	0.25819 (9)	0.74443 (10)	0.55028 (6)	0.0152 (3)
N2	0.10047 (10)	0.78421 (11)	0.51761 (7)	0.0183 (3)
H1	0.0964 (14)	0.8248 (14)	0.5499 (8)	0.022*
N3	0.27221 (9)	0.72905 (10)	0.71271 (6)	0.0152 (3)
N4	0.42557 (10)	0.78865 (11)	0.74247 (6)	0.0164 (3)
H29	0.4208 (14)	0.8347 (14)	0.7126 (8)	0.020*
Fe	0.25601 (2)	0.83290 (2)	0.63472 (2)	0.01437 (8)
Cl1	0.37746 (3)	0.95842 (3)	0.62727 (2)	0.02006 (10)
Cl2	0.11601 (3)	0.92675 (3)	0.64870 (2)	0.02200 (10)

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)iron(II) (5) . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
C1	0.0192 (8)	0.0150 (7)	0.0144 (7)	−0.0004 (6)	0.0018 (6)	0.0015 (6)
C2	0.0155 (7)	0.0178 (8)	0.0171 (8)	0.0012 (6)	0.0000 (6)	0.0017 (6)
C3	0.0161 (7)	0.0175 (8)	0.0172 (8)	0.0000 (6)	−0.0004 (6)	0.0018 (6)
C4	0.0191 (8)	0.0179 (8)	0.0159 (7)	0.0001 (6)	−0.0013 (6)	−0.0025 (6)
C5	0.0242 (8)	0.0186 (8)	0.0209 (8)	0.0027 (7)	0.0011 (7)	−0.0009 (6)
C6	0.0272 (9)	0.0245 (9)	0.0218 (8)	0.0012 (7)	0.0064 (7)	−0.0033 (7)
C7	0.0165 (7)	0.0159 (7)	0.0140 (7)	0.0021 (6)	0.0020 (6)	−0.0008 (6)
C8	0.0212 (8)	0.0210 (8)	0.0163 (8)	0.0007 (7)	0.0034 (6)	0.0032 (6)
C9	0.0222 (8)	0.0286 (9)	0.0188 (8)	0.0022 (7)	0.0062 (7)	0.0037 (7)
C10	0.0164 (8)	0.0380 (10)	0.0240 (9)	0.0031 (7)	0.0026 (7)	0.0010 (8)
C11	0.0214 (8)	0.0267 (9)	0.0161 (8)	0.0074 (7)	0.0001 (6)	0.0011 (7)
C12	0.0186 (8)	0.0191 (8)	0.0142 (7)	0.0023 (6)	0.0015 (6)	0.0009 (6)
C13	0.0162 (8)	0.0187 (8)	0.0162 (7)	0.0004 (6)	−0.0005 (6)	−0.0011 (6)
C14	0.0190 (8)	0.0174 (8)	0.0223 (8)	0.0017 (6)	−0.0003 (6)	−0.0005 (6)
C15	0.0168 (8)	0.0241 (8)	0.0220 (8)	0.0028 (7)	−0.0002 (6)	−0.0005 (7)
C16	0.0176 (8)	0.0324 (10)	0.0201 (8)	−0.0038 (7)	0.0013 (6)	−0.0010 (7)
C17	0.0259 (9)	0.0227 (9)	0.0252 (9)	−0.0072 (7)	0.0003 (7)	0.0012 (7)
C18	0.0248 (8)	0.0197 (8)	0.0229 (8)	0.0007 (7)	−0.0013 (7)	0.0031 (7)
C19	0.0177 (7)	0.0127 (7)	0.0125 (7)	0.0012 (6)	0.0028 (6)	−0.0017 (6)
C20	0.0162 (7)	0.0178 (8)	0.0154 (7)	−0.0016 (6)	0.0004 (6)	−0.0014 (6)
C21	0.0180 (8)	0.0205 (8)	0.0153 (7)	−0.0008 (6)	0.0019 (6)	−0.0019 (6)
C22	0.0275 (9)	0.0249 (9)	0.0213 (8)	−0.0021 (7)	0.0000 (7)	0.0084 (7)
C23	0.0471 (12)	0.0335 (10)	0.0215 (9)	−0.0152 (9)	0.0115 (8)	0.0009 (8)
C24	0.0387 (10)	0.0209 (9)	0.0272 (9)	−0.0069 (8)	0.0034 (8)	0.0049 (7)
C25	0.0173 (7)	0.0163 (7)	0.0147 (7)	−0.0029 (6)	0.0016 (6)	0.0001 (6)
C26	0.0208 (8)	0.0270 (9)	0.0161 (8)	−0.0055 (7)	0.0036 (6)	−0.0053 (7)
C27	0.0257 (9)	0.0401 (11)	0.0180 (8)	−0.0120 (8)	0.0067 (7)	−0.0055 (7)
C28	0.0200 (8)	0.0377 (10)	0.0215 (8)	−0.0109 (8)	0.0040 (7)	−0.0023 (7)
C29	0.0246 (9)	0.0267 (9)	0.0164 (8)	−0.0093 (7)	0.0002 (7)	−0.0010 (7)
C30	0.0196 (8)	0.0186 (8)	0.0138 (7)	−0.0028 (6)	0.0021 (6)	−0.0018 (6)
C31	0.0164 (7)	0.0163 (7)	0.0134 (7)	−0.0024 (6)	−0.0002 (6)	−0.0001 (6)
C32	0.0197 (8)	0.0163 (8)	0.0232 (8)	−0.0018 (6)	−0.0007 (6)	0.0011 (6)
C33	0.0207 (8)	0.0182 (8)	0.0244 (8)	−0.0044 (7)	−0.0025 (7)	0.0009 (7)
C34	0.0179 (8)	0.0270 (9)	0.0210 (8)	−0.0029 (7)	−0.0012 (6)	0.0022 (7)
C35	0.0208 (8)	0.0210 (8)	0.0247 (8)	0.0039 (7)	−0.0025 (7)	−0.0027 (7)
C36	0.0213 (8)	0.0196 (8)	0.0221 (8)	0.0007 (7)	−0.0023 (7)	−0.0042 (7)
N1	0.0154 (6)	0.0160 (6)	0.0141 (6)	0.0015 (5)	0.0010 (5)	0.0004 (5)
N2	0.0179 (7)	0.0204 (7)	0.0166 (7)	0.0026 (6)	−0.0017 (5)	−0.0047 (5)
N3	0.0168 (6)	0.0157 (6)	0.0133 (6)	−0.0012 (5)	0.0020 (5)	−0.0011 (5)
N4	0.0179 (7)	0.0172 (7)	0.0140 (6)	−0.0023 (5)	−0.0006 (5)	0.0040 (5)
Fe	0.01670 (12)	0.01337 (12)	0.01306 (12)	0.00048 (9)	0.00100 (8)	−0.00022 (8)
Cl1	0.0227 (2)	0.01594 (18)	0.02139 (19)	−0.00324 (15)	−0.00072 (15)	0.00174 (14)
Cl2	0.0226 (2)	0.0198 (2)	0.0237 (2)	0.00596 (15)	0.00141 (15)	−0.00294 (15)

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)iron(II) (5) . Geometric parameters (Å, º)

C1—N1	1.309 (2)	C20—C21	1.192 (2)
C1—N2	1.340 (2)	C21—C22	1.430 (2)
C1—C2	1.442 (2)	C22—C23	1.508 (3)
C2—C3	1.192 (2)	C22—C24	1.520 (3)
C3—C4	1.432 (2)	C22—H30	1.0000
C4—C6	1.508 (2)	C23—C24	1.483 (3)
C4—C5	1.512 (2)	C23—H31	0.9900
C4—H2	1.0000	C23—H32	0.9900
C5—C6	1.486 (2)	C24—H33	0.9900
C5—H3	0.9900	C24—H34	0.9900
C5—H4	0.9900	C25—N3	1.479 (2)
C6—H5	0.9900	C25—C26	1.523 (2)
C6—H6	0.9900	C25—C30	1.524 (2)
C7—N1	1.480 (2)	C25—H35	1.0000
C7—C12	1.518 (2)	C26—C27	1.523 (2)
C7—C8	1.526 (2)	C26—H36	0.9900
C7—H7	1.0000	C26—H37	0.9900
C8—C9	1.526 (2)	C27—C28	1.524 (2)
C8—H8	0.9900	C27—H38	0.9900
C8—H9	0.9900	C27—H39	0.9900
C9—C10	1.525 (2)	C28—C29	1.522 (3)
C9—H10	0.9900	C28—H40	0.9900
C9—H11	0.9900	C28—H41	0.9900
C10—C11	1.519 (2)	C29—C30	1.527 (2)
C10—H12	0.9900	C29—H42	0.9900
C10—H13	0.9900	C29—H43	0.9900
C11—C12	1.523 (2)	C30—H44	0.9900
C11—H14	0.9900	C30—H45	0.9900
C11—H15	0.9900	C31—N4	1.462 (2)
C12—H16	0.9900	C31—C36	1.521 (2)
C12—H17	0.9900	C31—C32	1.525 (2)
C13—N2	1.462 (2)	C31—H46	1.0000
C13—C14	1.520 (2)	C32—C33	1.526 (2)
C13—C18	1.526 (2)	C32—H47	0.9900
C13—H18	1.0000	C32—H48	0.9900
C14—C15	1.529 (2)	C33—C34	1.518 (2)
C14—H19	0.9900	C33—H49	0.9900
C14—H20	0.9900	C33—H50	0.9900
C15—C16	1.521 (2)	C34—C35	1.522 (2)
C15—H21	0.9900	C34—H51	0.9900
C15—H22	0.9900	C34—H52	0.9900
C16—C17	1.523 (3)	C35—C36	1.531 (2)
C16—H23	0.9900	C35—H53	0.9900
C16—H24	0.9900	C35—H54	0.9900
C17—C18	1.526 (2)	C36—H55	0.9900
C17—H25	0.9900	C36—H56	0.9900
C17—H26	0.9900	N1—Fe	2.0727 (15)
C18—H27	0.9900	N2—H1	0.844 (15)
C18—H28	0.9900	N3—Fe	2.0795 (15)
C19—N3	1.310 (2)	N4—H29	0.847 (15)
C19—N4	1.342 (2)	Fe—Cl2	2.3009 (10)
C19—C20	1.442 (2)	Fe—Cl1	2.3147 (9)
N1—C1—N2	122.59 (15)	C23—C22—H30	116.1
N1—C1—C2	121.70 (15)	C24—C22—H30	116.1
N2—C1—C2	115.70 (14)	C24—C23—C22	61.07 (13)
C3—C2—C1	179.10 (18)	C24—C23—H31	117.7
C2—C3—C4	179.02 (18)	C22—C23—H31	117.7
C3—C4—C6	118.74 (14)	C24—C23—H32	117.7
C3—C4—C5	119.09 (14)	C22—C23—H32	117.7
C6—C4—C5	58.96 (11)	H31—C23—H32	114.8
C3—C4—H2	116.0	C23—C24—C22	60.26 (13)
C6—C4—H2	116.0	C23—C24—H33	117.7
C5—C4—H2	116.0	C22—C24—H33	117.7
C6—C5—C4	60.36 (11)	C23—C24—H34	117.7
C6—C5—H3	117.7	C22—C24—H34	117.7
C4—C5—H3	117.7	H33—C24—H34	114.9
C6—C5—H4	117.7	N3—C25—C26	110.16 (13)
C4—C5—H4	117.7	N3—C25—C30	111.15 (13)
H3—C5—H4	114.9	C26—C25—C30	111.04 (13)
C5—C6—C4	60.67 (11)	N3—C25—H35	108.1
C5—C6—H5	117.7	C26—C25—H35	108.1
C4—C6—H5	117.7	C30—C25—H35	108.1
C5—C6—H6	117.7	C27—C26—C25	111.50 (14)
C4—C6—H6	117.7	C27—C26—H36	109.3
H5—C6—H6	114.8	C25—C26—H36	109.3
N1—C7—C12	110.96 (13)	C27—C26—H37	109.3
N1—C7—C8	110.50 (13)	C25—C26—H37	109.3
C12—C7—C8	110.32 (13)	H36—C26—H37	108.0
N1—C7—H7	108.3	C26—C27—C28	110.96 (14)
C12—C7—H7	108.3	C26—C27—H38	109.4
C8—C7—H7	108.3	C28—C27—H38	109.4
C7—C8—C9	110.96 (14)	C26—C27—H39	109.4
C7—C8—H8	109.4	C28—C27—H39	109.4
C9—C8—H8	109.4	H38—C27—H39	108.0
C7—C8—H9	109.4	C29—C28—C27	110.32 (15)
C9—C8—H9	109.4	C29—C28—H40	109.6
H8—C8—H9	108.0	C27—C28—H40	109.6
C10—C9—C8	111.94 (14)	C29—C28—H41	109.6
C10—C9—H10	109.2	C27—C28—H41	109.6
C8—C9—H10	109.2	H40—C28—H41	108.1
C10—C9—H11	109.2	C28—C29—C30	111.05 (14)
C8—C9—H11	109.2	C28—C29—H42	109.4
H10—C9—H11	107.9	C30—C29—H42	109.4
C11—C10—C9	111.72 (14)	C28—C29—H43	109.4
C11—C10—H12	109.3	C30—C29—H43	109.4
C9—C10—H12	109.3	H42—C29—H43	108.0
C11—C10—H13	109.3	C25—C30—C29	110.77 (13)
C9—C10—H13	109.3	C25—C30—H44	109.5
H12—C10—H13	107.9	C29—C30—H44	109.5
C10—C11—C12	111.46 (14)	C25—C30—H45	109.5
C10—C11—H14	109.3	C29—C30—H45	109.5
C12—C11—H14	109.3	H44—C30—H45	108.1
C10—C11—H15	109.3	N4—C31—C36	112.40 (13)
C12—C11—H15	109.3	N4—C31—C32	108.07 (13)
H14—C11—H15	108.0	C36—C31—C32	111.00 (14)
C7—C12—C11	110.16 (13)	N4—C31—H46	108.4
C7—C12—H16	109.6	C36—C31—H46	108.4
C11—C12—H16	109.6	C32—C31—H46	108.4
C7—C12—H17	109.6	C31—C32—C33	111.49 (13)
C11—C12—H17	109.6	C31—C32—H47	109.3
H16—C12—H17	108.1	C33—C32—H47	109.3
N2—C13—C14	110.21 (13)	C31—C32—H48	109.3
N2—C13—C18	111.59 (13)	C33—C32—H48	109.3
C14—C13—C18	111.26 (14)	H47—C32—H48	108.0
N2—C13—H18	107.9	C34—C33—C32	111.75 (14)
C14—C13—H18	107.9	C34—C33—H49	109.3
C18—C13—H18	107.9	C32—C33—H49	109.3
C13—C14—C15	110.26 (13)	C34—C33—H50	109.3
C13—C14—H19	109.6	C32—C33—H50	109.3
C15—C14—H19	109.6	H49—C33—H50	107.9
C13—C14—H20	109.6	C33—C34—C35	110.85 (14)
C15—C14—H20	109.6	C33—C34—H51	109.5
H19—C14—H20	108.1	C35—C34—H51	109.5
C16—C15—C14	111.69 (14)	C33—C34—H52	109.5
C16—C15—H21	109.3	C35—C34—H52	109.5
C14—C15—H21	109.3	H51—C34—H52	108.1
C16—C15—H22	109.3	C34—C35—C36	110.99 (14)
C14—C15—H22	109.3	C34—C35—H53	109.4
H21—C15—H22	107.9	C36—C35—H53	109.4
C15—C16—C17	111.43 (14)	C34—C35—H54	109.4
C15—C16—H23	109.3	C36—C35—H54	109.4
C17—C16—H23	109.3	H53—C35—H54	108.0
C15—C16—H24	109.3	C31—C36—C35	110.63 (13)
C17—C16—H24	109.3	C31—C36—H55	109.5
H23—C16—H24	108.0	C35—C36—H55	109.5
C16—C17—C18	110.53 (14)	C31—C36—H56	109.5
C16—C17—H25	109.5	C35—C36—H56	109.5
C18—C17—H25	109.5	H55—C36—H56	108.1
C16—C17—H26	109.5	C1—N1—C7	116.72 (13)
C18—C17—H26	109.5	C1—N1—Fe	123.97 (11)
H25—C17—H26	108.1	C7—N1—Fe	119.30 (10)
C13—C18—C17	110.69 (14)	C1—N2—C13	124.24 (14)
C13—C18—H27	109.5	C1—N2—H1	117.7 (14)
C17—C18—H27	109.5	C13—N2—H1	116.7 (14)
C13—C18—H28	109.5	C19—N3—C25	117.06 (13)
C17—C18—H28	109.5	C19—N3—Fe	123.80 (11)
H27—C18—H28	108.1	C25—N3—Fe	119.04 (10)
N3—C19—N4	122.01 (14)	C19—N4—C31	126.11 (13)
N3—C19—C20	121.58 (14)	C19—N4—H29	117.3 (13)
N4—C19—C20	116.41 (14)	C31—N4—H29	116.6 (13)
C21—C20—C19	174.78 (17)	N1—Fe—N3	108.64 (6)
C20—C21—C22	177.90 (18)	N1—Fe—Cl2	114.76 (5)
C21—C22—C23	119.33 (16)	N3—Fe—Cl2	106.66 (5)
C21—C22—C24	118.22 (15)	N1—Fe—Cl1	105.69 (5)
C23—C22—C24	58.66 (12)	N3—Fe—Cl1	114.71 (5)
C21—C22—H30	116.1	Cl2—Fe—Cl1	106.61 (4)
C3—C4—C5—C6	−107.90 (17)	C31—C32—C33—C34	54.38 (19)
C3—C4—C6—C5	108.49 (17)	C32—C33—C34—C35	−54.99 (19)
N1—C7—C8—C9	−179.50 (13)	C33—C34—C35—C36	56.42 (19)
C12—C7—C8—C9	57.43 (17)	N4—C31—C36—C35	177.45 (13)
C7—C8—C9—C10	−53.92 (19)	C32—C31—C36—C35	56.28 (18)
C8—C9—C10—C11	52.2 (2)	C34—C35—C36—C31	−57.25 (19)
C9—C10—C11—C12	−54.00 (19)	N2—C1—N1—C7	−173.40 (14)
N1—C7—C12—C11	178.12 (13)	C2—C1—N1—C7	5.2 (2)
C8—C7—C12—C11	−59.07 (18)	N2—C1—N1—Fe	5.9 (2)
C10—C11—C12—C7	57.54 (18)	C2—C1—N1—Fe	−175.49 (11)
N2—C13—C14—C15	179.28 (13)	C12—C7—N1—C1	−151.55 (14)
C18—C13—C14—C15	−56.38 (18)	C8—C7—N1—C1	85.76 (17)
C13—C14—C15—C16	55.25 (19)	C12—C7—N1—Fe	29.09 (16)
C14—C15—C16—C17	−55.31 (19)	C8—C7—N1—Fe	−93.61 (13)
C15—C16—C17—C18	55.58 (19)	N1—C1—N2—C13	−167.61 (15)
N2—C13—C18—C17	−178.89 (14)	C2—C1—N2—C13	13.7 (2)
C14—C13—C18—C17	57.55 (18)	C14—C13—N2—C1	−156.41 (15)
C16—C17—C18—C13	−56.52 (19)	C18—C13—N2—C1	79.44 (19)
C21—C22—C23—C24	107.03 (19)	N4—C19—N3—C25	−175.90 (14)
C21—C22—C24—C23	−108.9 (2)	C20—C19—N3—C25	5.0 (2)
N3—C25—C26—C27	178.69 (13)	N4—C19—N3—Fe	0.3 (2)
C30—C25—C26—C27	55.11 (18)	C20—C19—N3—Fe	−178.76 (11)
C25—C26—C27—C28	−55.9 (2)	C26—C25—N3—C19	85.50 (17)
C26—C27—C28—C29	56.7 (2)	C30—C25—N3—C19	−150.99 (14)
C27—C28—C29—C30	−57.4 (2)	C26—C25—N3—Fe	−90.90 (14)
N3—C25—C30—C29	−178.35 (13)	C30—C25—N3—Fe	32.62 (16)
C26—C25—C30—C29	−55.34 (18)	N3—C19—N4—C31	−177.79 (14)
C28—C29—C30—C25	56.85 (19)	C20—C19—N4—C31	1.3 (2)
N4—C31—C32—C33	−178.60 (13)	C36—C31—N4—C19	84.39 (19)
C36—C31—C32—C33	−54.92 (18)	C32—C31—N4—C19	−152.79 (15)

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)iron(II) (5) . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N2—H1···Cl2	0.84 (2)	2.42 (2)	3.2511 (19)	169 (2)
N4—H29···Cl1	0.85 (2)	2.41 (2)	3.2459 (18)	170 (2)
C22—H30···Cl1i	1.00	2.90	3.744 (3)	143
C35—H53···Cl1i	0.99	3.05	3.613 (2)	118
C28—H40···Cl2ii	0.99	2.91	3.699 (2)	138

Symmetry codes: (i) −x+1, y−1/2, −z+3/2; (ii) −x, y−1/2, −z+3/2.

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)cobalt(II) (6) . Crystal data

[CoCl2(C18H28N2)2]	F(000) = 1444
Mr = 674.67	Dx = 1.233 Mg m−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
a = 13.8898 (3) Å	Cell parameters from 25049 reflections
b = 12.5574 (3) Å	θ = 1.9–27.3°
c = 20.8394 (5) Å	µ = 0.65 mm−1
β = 91.717 (2)°	T = 153 K
V = 3633.17 (15) Å3	Rod, blue
Z = 4	0.39 × 0.19 × 0.10 mm

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)cobalt(II) (6) . Data collection

Stoe IPDS 2T diffractometer	7124 independent reflections
Radiation source: fine-focus sealed tube	5922 reflections with I > 2σ(I)
Detector resolution: 6.67 pixels mm-1	Rint = 0.042
area detector scans	θmax = 26.0°, θmin = 2.2°
Absorption correction: numerical X-Area and X-Red (Stoe & Cie, 2002)	h = −15→17
Tmin = 0.807, Tmax = 0.938	k = −15→15
22018 measured reflections	l = −25→25

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)cobalt(II) (6) . Refinement

Refinement on F2	Primary atom site location: dual
Least-squares matrix: full	Hydrogen site location: mixed
R[F2 > 2σ(F2)] = 0.035	H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.083	w = 1/[σ2(Fo2) + (0.0426P)2 + 1.0094P] where P = (Fo2 + 2Fc2)/3
S = 1.02	(Δ/σ)max = 0.001
7124 reflections	Δρmax = 0.65 e Å−3
394 parameters	Δρmin = −0.36 e Å−3
2 restraints

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)cobalt(II) (6) . Special details

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)cobalt(II) (6) . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
C1	0.68127 (13)	0.26772 (14)	0.01098 (8)	0.0221 (4)
C2	0.68620 (13)	0.33626 (15)	−0.04462 (8)	0.0246 (4)
C3	0.69022 (13)	0.39139 (14)	−0.09095 (8)	0.0238 (4)
C4	0.69597 (14)	0.45734 (15)	−0.14694 (8)	0.0255 (4)
H2	0.639622	0.453885	−0.177878	0.031*
C5	0.74656 (15)	0.56342 (15)	−0.14185 (9)	0.0314 (4)
H3	0.720164	0.623037	−0.168012	0.038*
H4	0.774340	0.584306	−0.099389	0.038*
C6	0.79318 (16)	0.47400 (17)	−0.17614 (10)	0.0357 (5)
H5	0.849734	0.439518	−0.154864	0.043*
H6	0.795549	0.478255	−0.223499	0.043*
C7	0.84593 (13)	0.30851 (14)	0.03345 (8)	0.0216 (4)
H7	0.829147	0.375167	0.009358	0.026*
C8	0.90582 (13)	0.33917 (15)	0.09268 (8)	0.0242 (4)
H8	0.923234	0.274419	0.117521	0.029*
H9	0.867750	0.386219	0.120380	0.029*
C9	0.99708 (14)	0.39662 (17)	0.07312 (9)	0.0311 (4)
H11	0.979370	0.464254	0.051400	0.037*
H10	1.036606	0.414083	0.112028	0.037*
C10	1.05599 (15)	0.3288 (2)	0.02837 (10)	0.0386 (5)
H13	1.111608	0.370733	0.013820	0.046*
H12	1.081342	0.266023	0.052129	0.046*
C11	0.99668 (15)	0.29143 (18)	−0.02980 (9)	0.0344 (5)
H15	1.035268	0.240872	−0.054871	0.041*
H14	0.980910	0.353300	−0.057618	0.041*
C12	0.90331 (14)	0.23711 (15)	−0.01041 (8)	0.0275 (4)
H17	0.863810	0.220094	−0.049399	0.033*
H16	0.918831	0.169466	0.012003	0.033*
C13	0.50831 (13)	0.24230 (15)	−0.01777 (8)	0.0251 (4)
H18	0.525235	0.259981	−0.062842	0.030*
C14	0.44241 (14)	0.14592 (16)	−0.01981 (9)	0.0293 (4)
H19	0.427183	0.124519	0.024470	0.035*
H20	0.475377	0.085598	−0.040437	0.035*
C15	0.34929 (14)	0.17201 (16)	−0.05751 (9)	0.0303 (4)
H22	0.364137	0.184913	−0.103020	0.036*
H21	0.305130	0.110251	−0.055881	0.036*
C16	0.29970 (14)	0.26938 (18)	−0.03075 (9)	0.0345 (5)
H24	0.242165	0.286411	−0.058018	0.041*
H23	0.277878	0.253451	0.013014	0.041*
C17	0.36628 (16)	0.36497 (17)	−0.02816 (10)	0.0369 (5)
H25	0.333240	0.425682	−0.007993	0.044*
H26	0.382614	0.386012	−0.072302	0.044*
C18	0.45860 (15)	0.33863 (16)	0.01048 (10)	0.0328 (4)
H27	0.502652	0.400597	0.010098	0.039*
H28	0.442784	0.323783	0.055614	0.039*
C19	0.84880 (13)	0.27434 (14)	0.25053 (8)	0.0213 (4)
C20	0.85597 (13)	0.34902 (14)	0.30319 (8)	0.0236 (4)
C21	0.85812 (14)	0.41499 (15)	0.34448 (8)	0.0259 (4)
C22	0.85834 (17)	0.49612 (17)	0.39270 (9)	0.0364 (5)
H30	0.922987	0.522900	0.407681	0.044*
C23	0.7774 (2)	0.57704 (18)	0.39069 (11)	0.0444 (6)
H31	0.793351	0.651330	0.402858	0.053*
H32	0.727111	0.569752	0.356306	0.053*
C24	0.7808 (2)	0.4955 (2)	0.44195 (11)	0.0510 (7)
H34	0.732534	0.437550	0.439489	0.061*
H33	0.798758	0.519109	0.486029	0.061*
C25	0.68956 (13)	0.33810 (15)	0.22933 (8)	0.0235 (4)
H35	0.715959	0.403773	0.250527	0.028*
C26	0.63157 (14)	0.37183 (15)	0.16962 (8)	0.0255 (4)
H37	0.607557	0.307863	0.146445	0.031*
H36	0.673432	0.412041	0.140594	0.031*
C27	0.54659 (15)	0.44134 (17)	0.18814 (9)	0.0336 (5)
H38	0.570996	0.508103	0.207974	0.040*
H39	0.508123	0.460339	0.149046	0.040*
C28	0.48268 (16)	0.3839 (2)	0.23505 (10)	0.0408 (5)
H40	0.429548	0.431574	0.247395	0.049*
H41	0.454034	0.320153	0.214098	0.049*
C29	0.54070 (16)	0.3506 (2)	0.29479 (10)	0.0420 (6)
H43	0.498800	0.310458	0.323824	0.050*
H42	0.564340	0.414812	0.317882	0.050*
C30	0.62621 (14)	0.28122 (17)	0.27699 (9)	0.0310 (4)
H44	0.664916	0.263746	0.316245	0.037*
H45	0.602324	0.213672	0.257887	0.037*
C31	1.01589 (13)	0.21371 (14)	0.28045 (8)	0.0223 (4)
H46	1.000389	0.228954	0.326094	0.027*
C32	1.08503 (14)	0.29842 (16)	0.25785 (9)	0.0296 (4)
H47	1.055450	0.369628	0.262519	0.036*
H48	1.097814	0.287215	0.211865	0.036*
C33	1.17997 (15)	0.29393 (16)	0.29703 (10)	0.0319 (4)
H50	1.224839	0.348128	0.280692	0.038*
H49	1.167746	0.310826	0.342464	0.038*
C34	1.22609 (14)	0.18423 (17)	0.29290 (10)	0.0323 (4)
H52	1.244067	0.170104	0.248086	0.039*
H51	1.285534	0.182371	0.320300	0.039*
C35	1.15711 (15)	0.09852 (16)	0.31466 (10)	0.0311 (4)
H53	1.145601	0.107716	0.360982	0.037*
H54	1.186802	0.027682	0.308657	0.037*
C36	1.06089 (14)	0.10306 (15)	0.27715 (9)	0.0289 (4)
H56	1.071126	0.084213	0.231730	0.035*
H55	1.016155	0.050150	0.295016	0.035*
N1	0.75490 (11)	0.25596 (12)	0.05117 (7)	0.0213 (3)
N2	0.59761 (11)	0.21671 (13)	0.01815 (7)	0.0262 (3)
H1	0.5925 (16)	0.1765 (16)	0.0506 (9)	0.031*
N3	0.77203 (11)	0.26909 (11)	0.21253 (7)	0.0211 (3)
N4	0.92585 (11)	0.21171 (13)	0.24215 (7)	0.0232 (3)
H29	0.9211 (16)	0.1646 (15)	0.2125 (9)	0.028*
Co	0.75507 (2)	0.17118 (2)	0.13474 (2)	0.02071 (7)
Cl1	0.87506 (4)	0.04756 (3)	0.12921 (2)	0.02899 (11)
Cl2	0.61692 (4)	0.07705 (4)	0.14621 (2)	0.03201 (11)

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)cobalt(II) (6) . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
C1	0.0268 (9)	0.0219 (8)	0.0176 (8)	−0.0004 (7)	0.0012 (7)	−0.0010 (6)
C2	0.0229 (9)	0.0268 (9)	0.0240 (9)	−0.0021 (8)	−0.0024 (7)	−0.0011 (7)
C3	0.0233 (9)	0.0248 (9)	0.0234 (9)	−0.0012 (7)	−0.0011 (7)	−0.0010 (7)
C4	0.0279 (10)	0.0252 (9)	0.0232 (8)	−0.0019 (8)	−0.0026 (7)	0.0047 (7)
C5	0.0367 (11)	0.0265 (10)	0.0310 (10)	−0.0053 (9)	0.0014 (8)	0.0010 (8)
C6	0.0396 (12)	0.0349 (11)	0.0330 (10)	0.0008 (10)	0.0105 (9)	0.0058 (9)
C7	0.0220 (9)	0.0234 (9)	0.0196 (8)	−0.0034 (7)	0.0007 (7)	0.0013 (7)
C8	0.0263 (9)	0.0264 (9)	0.0199 (8)	−0.0044 (8)	0.0012 (7)	−0.0021 (7)
C9	0.0273 (10)	0.0412 (11)	0.0248 (9)	−0.0108 (9)	−0.0008 (7)	−0.0020 (8)
C10	0.0245 (10)	0.0573 (14)	0.0342 (11)	−0.0047 (10)	0.0040 (8)	−0.0021 (10)
C11	0.0308 (11)	0.0451 (12)	0.0277 (9)	−0.0036 (9)	0.0081 (8)	−0.0068 (9)
C12	0.0285 (10)	0.0314 (10)	0.0227 (9)	−0.0033 (8)	0.0038 (7)	−0.0042 (7)
C13	0.0232 (9)	0.0290 (9)	0.0227 (8)	−0.0016 (8)	−0.0029 (7)	0.0026 (7)
C14	0.0273 (10)	0.0281 (10)	0.0323 (10)	−0.0023 (8)	−0.0014 (8)	0.0014 (8)
C15	0.0238 (9)	0.0354 (10)	0.0316 (10)	−0.0052 (8)	−0.0024 (8)	0.0019 (8)
C16	0.0248 (10)	0.0504 (13)	0.0282 (10)	0.0069 (9)	0.0013 (8)	0.0012 (9)
C17	0.0363 (12)	0.0352 (11)	0.0389 (11)	0.0105 (10)	−0.0014 (9)	−0.0026 (9)
C18	0.0343 (11)	0.0303 (10)	0.0335 (10)	0.0003 (9)	−0.0027 (8)	−0.0062 (8)
C19	0.0250 (9)	0.0219 (8)	0.0171 (8)	0.0009 (7)	0.0027 (7)	0.0018 (6)
C20	0.0242 (9)	0.0256 (9)	0.0211 (8)	0.0020 (8)	0.0006 (7)	0.0014 (7)
C21	0.0282 (10)	0.0280 (9)	0.0214 (8)	0.0023 (8)	−0.0002 (7)	0.0014 (7)
C22	0.0416 (12)	0.0371 (11)	0.0304 (10)	0.0013 (10)	−0.0008 (9)	−0.0133 (9)
C23	0.0635 (16)	0.0295 (11)	0.0404 (12)	0.0109 (11)	0.0054 (11)	−0.0069 (9)
C24	0.0733 (18)	0.0509 (14)	0.0297 (11)	0.0245 (13)	0.0150 (11)	−0.0016 (10)
C25	0.0246 (9)	0.0261 (9)	0.0200 (8)	0.0056 (8)	0.0010 (7)	0.0001 (7)
C26	0.0274 (10)	0.0292 (9)	0.0201 (8)	0.0069 (8)	0.0017 (7)	0.0026 (7)
C27	0.0367 (11)	0.0393 (11)	0.0247 (9)	0.0175 (9)	−0.0003 (8)	0.0022 (8)
C28	0.0305 (11)	0.0610 (15)	0.0313 (10)	0.0196 (11)	0.0069 (8)	0.0055 (10)
C29	0.0371 (12)	0.0635 (15)	0.0260 (10)	0.0199 (11)	0.0098 (9)	0.0089 (10)
C30	0.0280 (10)	0.0415 (11)	0.0238 (9)	0.0102 (9)	0.0046 (8)	0.0091 (8)
C31	0.0243 (9)	0.0239 (8)	0.0185 (8)	0.0026 (7)	−0.0019 (7)	0.0002 (7)
C32	0.0300 (10)	0.0267 (9)	0.0318 (10)	−0.0011 (8)	−0.0043 (8)	0.0069 (8)
C33	0.0287 (10)	0.0299 (10)	0.0366 (10)	−0.0046 (9)	−0.0070 (8)	0.0046 (8)
C34	0.0242 (10)	0.0399 (11)	0.0324 (10)	0.0027 (9)	−0.0030 (8)	−0.0040 (8)
C35	0.0306 (10)	0.0259 (9)	0.0365 (10)	0.0079 (8)	−0.0057 (8)	−0.0002 (8)
C36	0.0280 (10)	0.0233 (9)	0.0353 (10)	0.0018 (8)	−0.0021 (8)	−0.0022 (8)
N1	0.0217 (8)	0.0223 (7)	0.0198 (7)	−0.0024 (6)	0.0009 (6)	0.0000 (6)
N2	0.0230 (8)	0.0312 (8)	0.0242 (7)	−0.0041 (7)	−0.0040 (6)	0.0077 (6)
N3	0.0236 (8)	0.0213 (7)	0.0183 (7)	0.0027 (6)	0.0003 (6)	0.0023 (6)
N4	0.0241 (8)	0.0253 (8)	0.0200 (7)	0.0034 (7)	−0.0027 (6)	−0.0052 (6)
Co	0.02311 (13)	0.02012 (12)	0.01881 (12)	−0.00067 (10)	−0.00071 (9)	0.00079 (9)
Cl1	0.0338 (3)	0.0225 (2)	0.0304 (2)	0.00481 (19)	−0.00324 (18)	−0.00277 (17)
Cl2	0.0329 (3)	0.0295 (2)	0.0336 (2)	−0.0093 (2)	0.00000 (19)	0.00584 (18)

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)cobalt(II) (6) . Geometric parameters (Å, º)

C1—N1	1.311 (2)	C20—C21	1.194 (3)
C1—N2	1.339 (2)	C21—C22	1.431 (3)
C1—C2	1.447 (2)	C22—C24	1.510 (3)
C2—C3	1.191 (3)	C22—C23	1.515 (3)
C3—C4	1.435 (2)	C22—H30	1.0000
C4—C5	1.508 (3)	C23—C24	1.479 (3)
C4—C6	1.512 (3)	C23—H31	0.9900
C4—H2	1.0000	C23—H32	0.9900
C5—C6	1.490 (3)	C24—H34	0.9900
C5—H3	0.9900	C24—H33	0.9900
C5—H4	0.9900	C25—N3	1.487 (2)
C6—H5	0.9900	C25—C26	1.522 (2)
C6—H6	0.9900	C25—C30	1.524 (2)
C7—N1	1.483 (2)	C25—H35	1.0000
C7—C8	1.517 (2)	C26—C27	1.527 (3)
C7—C12	1.523 (2)	C26—H37	0.9900
C7—H7	1.0000	C26—H36	0.9900
C8—C9	1.525 (3)	C27—C28	1.522 (3)
C8—H8	0.9900	C27—H38	0.9900
C8—H9	0.9900	C27—H39	0.9900
C9—C10	1.520 (3)	C28—C29	1.521 (3)
C9—H11	0.9900	C28—H40	0.9900
C9—H10	0.9900	C28—H41	0.9900
C10—C11	1.519 (3)	C29—C30	1.528 (3)
C10—H13	0.9900	C29—H43	0.9900
C10—H12	0.9900	C29—H42	0.9900
C11—C12	1.530 (3)	C30—H44	0.9900
C11—H15	0.9900	C30—H45	0.9900
C11—H14	0.9900	C31—N4	1.463 (2)
C12—H17	0.9900	C31—C32	1.517 (3)
C12—H16	0.9900	C31—C36	1.526 (3)
C13—N2	1.465 (2)	C31—H46	1.0000
C13—C14	1.517 (3)	C32—C33	1.531 (3)
C13—C18	1.520 (3)	C32—H47	0.9900
C13—H18	1.0000	C32—H48	0.9900
C14—C15	1.529 (3)	C33—C34	1.523 (3)
C14—H19	0.9900	C33—H50	0.9900
C14—H20	0.9900	C33—H49	0.9900
C15—C16	1.518 (3)	C34—C35	1.519 (3)
C15—H22	0.9900	C34—H52	0.9900
C15—H21	0.9900	C34—H51	0.9900
C16—C17	1.515 (3)	C35—C36	1.529 (3)
C16—H24	0.9900	C35—H53	0.9900
C16—H23	0.9900	C35—H54	0.9900
C17—C18	1.530 (3)	C36—H56	0.9900
C17—H25	0.9900	C36—H55	0.9900
C17—H26	0.9900	N1—Co	2.0412 (14)
C18—H27	0.9900	N2—H1	0.848 (15)
C18—H28	0.9900	N3—Co	2.0426 (14)
C19—N3	1.311 (2)	N4—H29	0.856 (15)
C19—N4	1.344 (2)	Co—Cl2	2.2725 (5)
C19—C20	1.445 (2)	Co—Cl1	2.2830 (5)
N1—C1—N2	122.55 (16)	C24—C22—H30	116.2
N1—C1—C2	121.60 (16)	C23—C22—H30	116.2
N2—C1—C2	115.85 (16)	C24—C23—C22	60.54 (15)
C3—C2—C1	179.04 (19)	C24—C23—H31	117.7
C2—C3—C4	179.4 (2)	C22—C23—H31	117.7
C3—C4—C5	119.33 (16)	C24—C23—H32	117.7
C3—C4—C6	118.63 (17)	C22—C23—H32	117.7
C5—C4—C6	59.10 (13)	H31—C23—H32	114.8
C3—C4—H2	116.0	C23—C24—C22	60.89 (16)
C5—C4—H2	116.0	C23—C24—H34	117.7
C6—C4—H2	116.0	C22—C24—H34	117.7
C6—C5—C4	60.58 (13)	C23—C24—H33	117.7
C6—C5—H3	117.7	C22—C24—H33	117.7
C4—C5—H3	117.7	H34—C24—H33	114.8
C6—C5—H4	117.7	N3—C25—C26	111.25 (14)
C4—C5—H4	117.7	N3—C25—C30	110.13 (15)
H3—C5—H4	114.8	C26—C25—C30	111.19 (16)
C5—C6—C4	60.33 (13)	N3—C25—H35	108.0
C5—C6—H5	117.7	C26—C25—H35	108.0
C4—C6—H5	117.7	C30—C25—H35	108.0
C5—C6—H6	117.7	C25—C26—C27	110.28 (14)
C4—C6—H6	117.7	C25—C26—H37	109.6
H5—C6—H6	114.9	C27—C26—H37	109.6
N1—C7—C8	111.17 (13)	C25—C26—H36	109.6
N1—C7—C12	110.67 (14)	C27—C26—H36	109.6
C8—C7—C12	110.71 (15)	H37—C26—H36	108.1
N1—C7—H7	108.1	C28—C27—C26	111.21 (17)
C8—C7—H7	108.1	C28—C27—H38	109.4
C12—C7—H7	108.1	C26—C27—H38	109.4
C7—C8—C9	110.03 (14)	C28—C27—H39	109.4
C7—C8—H8	109.7	C26—C27—H39	109.4
C9—C8—H8	109.7	H38—C27—H39	108.0
C7—C8—H9	109.7	C29—C28—C27	110.56 (19)
C9—C8—H9	109.7	C29—C28—H40	109.5
H8—C8—H9	108.2	C27—C28—H40	109.5
C10—C9—C8	111.47 (17)	C29—C28—H41	109.5
C10—C9—H11	109.3	C27—C28—H41	109.5
C8—C9—H11	109.3	H40—C28—H41	108.1
C10—C9—H10	109.3	C28—C29—C30	110.79 (16)
C8—C9—H10	109.3	C28—C29—H43	109.5
H11—C9—H10	108.0	C30—C29—H43	109.5
C11—C10—C9	111.94 (18)	C28—C29—H42	109.5
C11—C10—H13	109.2	C30—C29—H42	109.5
C9—C10—H13	109.2	H43—C29—H42	108.1
C11—C10—H12	109.2	C25—C30—C29	111.05 (17)
C9—C10—H12	109.2	C25—C30—H44	109.4
H13—C10—H12	107.9	C29—C30—H44	109.4
C10—C11—C12	111.75 (16)	C25—C30—H45	109.4
C10—C11—H15	109.3	C29—C30—H45	109.4
C12—C11—H15	109.3	H44—C30—H45	108.0
C10—C11—H14	109.3	N4—C31—C32	112.41 (14)
C12—C11—H14	109.3	N4—C31—C36	107.71 (15)
H15—C11—H14	107.9	C32—C31—C36	111.12 (16)
C7—C12—C11	111.04 (16)	N4—C31—H46	108.5
C7—C12—H17	109.4	C32—C31—H46	108.5
C11—C12—H17	109.4	C36—C31—H46	108.5
C7—C12—H16	109.4	C31—C32—C33	110.59 (15)
C11—C12—H16	109.4	C31—C32—H47	109.5
H17—C12—H16	108.0	C33—C32—H47	109.5
N2—C13—C14	109.88 (15)	C31—C32—H48	109.5
N2—C13—C18	111.35 (15)	C33—C32—H48	109.5
C14—C13—C18	111.41 (16)	H47—C32—H48	108.1
N2—C13—H18	108.0	C34—C33—C32	111.12 (16)
C14—C13—H18	108.0	C34—C33—H50	109.4
C18—C13—H18	108.0	C32—C33—H50	109.4
C13—C14—C15	110.11 (16)	C34—C33—H49	109.4
C13—C14—H19	109.6	C32—C33—H49	109.4
C15—C14—H19	109.6	H50—C33—H49	108.0
C13—C14—H20	109.6	C35—C34—C33	110.73 (16)
C15—C14—H20	109.6	C35—C34—H52	109.5
H19—C14—H20	108.2	C33—C34—H52	109.5
C16—C15—C14	111.73 (16)	C35—C34—H51	109.5
C16—C15—H22	109.3	C33—C34—H51	109.5
C14—C15—H22	109.3	H52—C34—H51	108.1
C16—C15—H21	109.3	C34—C35—C36	111.74 (16)
C14—C15—H21	109.3	C34—C35—H53	109.3
H22—C15—H21	107.9	C36—C35—H53	109.3
C17—C16—C15	111.59 (16)	C34—C35—H54	109.3
C17—C16—H24	109.3	C36—C35—H54	109.3
C15—C16—H24	109.3	H53—C35—H54	107.9
C17—C16—H23	109.3	C31—C36—C35	111.34 (16)
C15—C16—H23	109.3	C31—C36—H56	109.4
H24—C16—H23	108.0	C35—C36—H56	109.4
C16—C17—C18	110.40 (17)	C31—C36—H55	109.4
C16—C17—H25	109.6	C35—C36—H55	109.4
C18—C17—H25	109.6	H56—C36—H55	108.0
C16—C17—H26	109.6	C1—N1—C7	116.47 (14)
C18—C17—H26	109.6	C1—N1—Co	125.79 (12)
H25—C17—H26	108.1	C7—N1—Co	117.74 (11)
C13—C18—C17	110.58 (16)	C1—N2—C13	124.21 (15)
C13—C18—H27	109.5	C1—N2—H1	117.9 (16)
C17—C18—H27	109.5	C13—N2—H1	116.6 (16)
C13—C18—H28	109.5	C19—N3—C25	116.56 (14)
C17—C18—H28	109.5	C19—N3—Co	125.60 (12)
H27—C18—H28	108.1	C25—N3—Co	117.81 (11)
N3—C19—N4	121.93 (16)	C19—N4—C31	126.16 (15)
N3—C19—C20	121.86 (16)	C19—N4—H29	117.0 (15)
N4—C19—C20	116.20 (16)	C31—N4—H29	116.8 (15)
C21—C20—C19	175.8 (2)	N1—Co—N3	111.12 (6)
C20—C21—C22	178.0 (2)	N1—Co—Cl2	112.43 (4)
C21—C22—C24	119.2 (2)	N3—Co—Cl2	107.90 (4)
C21—C22—C23	118.18 (19)	N1—Co—Cl1	107.08 (4)
C24—C22—C23	58.57 (15)	N3—Co—Cl1	112.48 (4)
C21—C22—H30	116.2	Cl2—Co—Cl1	105.76 (2)
C3—C4—C5—C6	107.7 (2)	C31—C32—C33—C34	57.3 (2)
C3—C4—C6—C5	−108.88 (19)	C32—C33—C34—C35	−56.4 (2)
N1—C7—C8—C9	−177.91 (15)	C33—C34—C35—C36	55.0 (2)
C12—C7—C8—C9	58.6 (2)	N4—C31—C36—C35	178.57 (15)
C7—C8—C9—C10	−57.1 (2)	C32—C31—C36—C35	55.0 (2)
C8—C9—C10—C11	54.2 (2)	C34—C35—C36—C31	−54.4 (2)
C9—C10—C11—C12	−52.3 (3)	N2—C1—N1—C7	173.79 (16)
N1—C7—C12—C11	179.12 (15)	C2—C1—N1—C7	−5.4 (2)
C8—C7—C12—C11	−57.1 (2)	N2—C1—N1—Co	−5.6 (2)
C10—C11—C12—C7	53.7 (2)	C2—C1—N1—Co	175.14 (12)
N2—C13—C14—C15	−179.74 (15)	C8—C7—N1—C1	150.77 (16)
C18—C13—C14—C15	56.4 (2)	C12—C7—N1—C1	−85.76 (19)
C13—C14—C15—C16	−55.0 (2)	C8—C7—N1—Co	−29.76 (18)
C14—C15—C16—C17	55.4 (2)	C12—C7—N1—Co	93.71 (15)
C15—C16—C17—C18	−55.7 (2)	N1—C1—N2—C13	167.74 (17)
N2—C13—C18—C17	179.27 (16)	C2—C1—N2—C13	−13.0 (3)
C14—C13—C18—C17	−57.7 (2)	C14—C13—N2—C1	156.28 (17)
C16—C17—C18—C13	56.6 (2)	C18—C13—N2—C1	−79.8 (2)
C21—C22—C23—C24	108.7 (2)	N4—C19—N3—C25	176.46 (15)
C21—C22—C24—C23	−107.0 (2)	C20—C19—N3—C25	−4.6 (2)
N3—C25—C26—C27	179.25 (16)	N4—C19—N3—Co	−1.4 (2)
C30—C25—C26—C27	56.1 (2)	C20—C19—N3—Co	177.62 (12)
C25—C26—C27—C28	−56.9 (2)	C26—C25—N3—C19	149.59 (16)
C26—C27—C28—C29	57.3 (2)	C30—C25—N3—C19	−86.66 (19)
C27—C28—C29—C30	−56.5 (3)	C26—C25—N3—Co	−32.41 (18)
N3—C25—C30—C29	−179.81 (16)	C30—C25—N3—Co	91.34 (15)
C26—C25—C30—C29	−56.0 (2)	N3—C19—N4—C31	177.89 (16)
C28—C29—C30—C25	56.0 (3)	C20—C19—N4—C31	−1.1 (3)
N4—C31—C32—C33	−177.17 (15)	C32—C31—N4—C19	−83.8 (2)
C36—C31—C32—C33	−56.4 (2)	C36—C31—N4—C19	153.48 (17)

Dichloridobis(N,N'-dicyclohexyl-3-cyclopropylprop-2-ynamidine)cobalt(II) (6) . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N2—H1···Cl2	0.85 (2)	2.37 (2)	3.1979 (16)	166 (2)
N4—H29···Cl1	0.86 (2)	2.35 (2)	3.1917 (15)	168 (2)
C22—H30···Cl1i	1.00	2.95	3.800 (2)	144
C33—H49···Cl1i	0.99	3.09	3.628 (2)	115
C28—H40···Cl2ii	0.99	2.96	3.758 (2)	139

Symmetry codes: (i) −x+2, y+1/2, −z+1/2; (ii) −x+1, y+1/2, −z+1/2.

Funding Statement

This work was funded by China Scholarship Council grant 201508080111 to S. Wang. Universität Magdeburg grant .