Bis(l-leucinium) hexa­chlorido­stannate(IV) dihydrate

The l-leucinium cations in the title compound adopt extended conformations that maximize the separation between the methyl groups [–CH(CH₃)₂] and the polar NH₃⁺ and COOH groups.

Abstract

The title compound, (C₆H₁₄NO₂)₂[SnCl₆]·2H₂O, features l-leucinium cations adopting extended conformations, which maximizes the separation between the methyl groups [–CH(CH₃)₂] and the polar NH₃⁺ and COOH moieties. Additionally, an intra­molecular hydrogen bond between the ammonium (NH₃⁺) group and the carboxyl group induces a slight reduction in the C—C—N bond angles, with an average value of 106.5°, compared to the ideal tetra­hedral angle of 109.5°. The NH₃⁺ group is nearly coplanar with the C—C—C—C carbon chain in both fragments, whereas the carboxyl (COOH) group and the methyl group at the C5 position deviate significantly from this plane. The octa­hedral complex anion is close to regular. In the crystal, an extensive network of hydrogen bonds links the components into a three-dimensional network.

Structure description

The title compound, 2(C₆H₁₄NO₂)⁺·[SnCl₆]^2–·2H₂O, crystallizes in the monoclinic space group P2₁. The asymmetric unit consists of two protonated l-leucinium cations, one hexa­chloro­stannate(IV) anion, and two water mol­ecules of crystallization (Fig. 1 ▸). Equivalent atoms in the cations are labelled C1A and C1B, etc.

Figure 1.

The mol­ecular structure of the title compound with displacement ellipsoids drawn at the 50% probability level.

During synthesis, the oxidation state of tin atom changed from +II to +IV, resulting in a tin(IV) atom hexa­coordinated by chloride ions and forming a slightly distorted octa­hedral geometry. The Sn—Cl bond lengths range from 2.4045 (11) to 2.4387 (11) Å, while the Cl—Sn—Cl angles deviate by approximately ±1° [88.62 (4)–91.38 (4)°] from the ideal 90° of a regular octa­hedron, indicating only minimal angular distortion. The absence of more significant distortions can likely be attributed to the fact that the hexa­chloro­stannate(IV) anions are discrete; nevertheless, they accept numerous N—H⋯Cl and O—H⋯Cl hydrogen bonds from the organic cations and water mol­ecules, as seen in related structures (Ghallab et al., 2020 ▸; Gheribi et al., 2022 ▸).

The l-leucinium cations in the title compound adopt extended conformations, maximizing the separation between the methyl groups [–CH(CH₃)₂] and the polar NH₃⁺ and COOH groups. This arrangement results in C1—C2 bond lengths that are slightly longer than the median value typically observed for a single C—C bond, with measured values of 1.521 (6) and 1.517 (7) Å for the two cations. The C2—C3—C4 angles, at 115.2 (3) and 115.8 (3)°, are larger than the other C—C—C angles in the carbon backbone (mean: 109.5°), a difference attributed to steric hindrance between the methyl groups and the polar functions. Additionally, an intra­molecular hydrogen bond between the NH₃⁺ group and the carboxyl group slightly reduce the C1—C2—N1 angles, which average 106.5°, compared to the theoretical tetra­hedral value of 109.5°.

The N atoms of the NH₃⁺ groups are nearly coplanar with the C2—C3—C4—C6 chains, as indicated by the torsion angles N1—C2—C3—C4 [–68.6 (4) and −62.0 (4)° for the A and B cations, respectively] and C2—C3—C4—C6 [168.7 (3) and 170.9 (4)°]. In contrast, the COOH group and the methyl group at C5 deviate significantly from this plane, with torsion angles of 170.1 (3) and 178.2 (3)° for C1—C2—C3—C4 and −68.7 (4) and −66.6 (4)° for C5—C4—C3—C2. This extended conformation is consistent with that observed for free l-leucine and its salts with inorganic acids (Zeghouan et al., 2012 ▸; Fleck et al., 2013 ▸; Janczak et al., 2007 ▸), with the notable exception of l-leucinium oxalate (Rajagopal et al., 2003 ▸) and l-leucinium picrate (Anitha et al., 2005 ▸), where the carboxyl group is nearly coplanar with the C2—C3—C4—C6 backbone.

The three-dimensional architecture of the extended structure of the title compound is consolidated by an extensive hydrogen-bonding network (Table 1 ▸). A central feature of this network is the (10) graph-set motif formed by the N1B—H1BA⋯O2A and N1A—H1AC⋯O2B hydrogen bonds (Fig. 2 ▸). This motif organizes the cations into dimers, which propagate along the crystallographic a-axis to form hydrogen-bonded layers lying parallel to the ac plane.

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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1A—H1AA⋯Cl3i	0.91	2.78	3.470 (4)	133
N1A—H1AA⋯Cl5i	0.91	2.58	3.342 (4)	142
N1A—H1AB⋯Cl4ii	0.91	2.77	3.471 (4)	134
N1A—H1AB⋯Cl6ii	0.91	2.65	3.452 (4)	148
N1A—H1AC⋯O2A	0.91	2.17	2.620 (5)	110
N1A—H1AC⋯O2B	0.91	2.26	2.959 (5)	133
N1B—H1BA⋯O2A	0.91	1.99	2.873 (5)	164
N1B—H1BA⋯O2B	0.91	2.27	2.626 (5)	103
N1B—H1BB⋯Cl2	0.91	2.47	3.352 (4)	164
N1B—H1BC⋯Cl1iii	0.91	2.71	3.583 (4)	162
O1A—H1A⋯O1W	0.84	1.79	2.624 (5)	169
O1B—H1B⋯O2W	0.84	1.79	2.627 (6)	173
O1W—H1WA⋯Cl6iii	0.87	2.69	3.440 (3)	145
O1W—H1WB⋯Cl1	0.87	2.44	3.283 (4)	162
O2W—H2WA⋯Cl3ii	0.87	2.48	3.312 (4)	161
O2W—H2WB⋯Cl5i	0.87	2.63	3.393 (3)	147

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

Figure 2.

Projection onto the ac plane showing (10) graph-set motifs that organize the mol­ecules into dimers.

The water mol­ecules (O1W, O2W) act as critical structural mediators. Their participation in four key hydrogen bonds, viz., O1W—H1WA⋯Cl6, O1W—H1WB⋯Cl1, O2W—H2WA⋯Cl3 and O2W—H2WB⋯Cl5, anchors the anionic layer. Furthermore, the water mol­ecules bridge the cationic and anionic layers via acceptor–donor inter­actions (O1A—H1A⋯O1W and O1B—H1B⋯O2W), effectively inter­connecting the two substructures (Fig. 3 ▸). Additional consolidation arises from N—H⋯Cl hydrogen bonds, which reinforce the cohesion between adjacent layers. These inter­actions, combined with the water-mediated network, create a robust three-dimensional framework.

Figure 3.

Projection onto the bc plane showing the inter­connection of the cationic and anionic sublayers mediated by water mol­ecules.

The synergy between dimer-forming (10) motifs, water-mediated inter­layer connectivity, and N—H⋯Cl inter­actions highlights the hierarchical role of hydrogen bonding in directing the crystal packing. This architecture underscores the importance of solvent mol­ecules in templating anion–cation organization in hybrid inorganic–organic systems.

Synthesis and crystallization

A mixture of l-leucine (0.262 g) and tin(II) chloride dihydrate (SnCl₂·2H₂O, 0.255 g) was dissolved in 20 ml of distilled water acidified with 3 drops of concentrated hydro­chloric acid (HCl, 37%). The solution was stirred and heated at 60°C for 1 h. It was then left to slowly evaporate at room temperature. After 7 days, colourless single crystals suitable for X-ray diffraction analysis were obtained.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸.

Table 2. Experimental details.

Crystal data
Chemical formula	(C6H14NO2)2[SnCl6]·2H2O
M r	631.78
Crystal system, space group	Monoclinic, P21
Temperature (K)	150
a, b, c (Å)	10.9838 (11), 10.7837 (11), 10.8556 (11)
β (°)	102.316 (4)
V (Å3)	1256.2 (2)
Z	2
Radiation type	Mo Kα
μ (mm−1)	1.68
Crystal size (mm)	0.17 × 0.13 × 0.11
Data collection
Diffractometer	D8 VENTURE Bruker AXS
Absorption correction	Multi-scan (SADABS; Krause et al., 2015 ▸)
Tmin, Tmax	0.769, 0.831
No. of measured, independent and observed [I > 2σ(I)] reflections	13707, 5560, 5406
R int	0.024
(sin θ/λ)max (Å−1)	0.649
Refinement
R[F2 > 2σ(F2)], wR(F2), S	0.021, 0.052, 1.08
No. of reflections	5560
No. of parameters	255
No. of restraints	1
H-atom treatment	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	1.14, −0.96
Absolute structure	Flack x determined using 2423 quotients [(I+)−(I−)]/[(I+)+(I−)] (Parsons et al., 2013 ▸)
Absolute structure parameter	−0.004 (10)

Computer programs: APEX2 and SAINT (Bruker, 2014 ▸), SHELXT2018/2 (Sheldrick, 2015a ▸), SHELXL2019/3 (Sheldrick, 2015b ▸) and OLEX2 (Dolomanov et al., 2009 ▸).

Supplementary Material

CCDC reference: 2478499

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

full crystallographic data

Bis(L-leucinium) hexachloridostannate(IV) dihydrate . Crystal data

(C6H14NO2)2[SnCl6]·2H2O	F(000) = 636
Mr = 631.78	Dx = 1.670 Mg m−3
Monoclinic, P21	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P2yb	Cell parameters from 5406 reflections
a = 10.9838 (11) Å	θ = 2.4–27.5°
b = 10.7837 (11) Å	µ = 1.68 mm−1
c = 10.8556 (11) Å	T = 150 K
β = 102.316 (4)°	Block, white
V = 1256.2 (2) Å3	0.17 × 0.13 × 0.11 mm
Z = 2

Bis(L-leucinium) hexachloridostannate(IV) dihydrate . Data collection

D8 VENTURE Bruker AXS diffractometer	5406 reflections with I > 2σ(I)
Radiation source: Enraf Nonius FR590	Rint = 0.024
CCD rotation images, thick slices scans	θmax = 27.5°, θmin = 1.9°
Absorption correction: multi-scan (SADABS; Krause et al., 2015)	h = −14→14
Tmin = 0.769, Tmax = 0.831	k = −12→13
13707 measured reflections	l = −14→14
5560 independent reflections

Bis(L-leucinium) hexachloridostannate(IV) dihydrate . Refinement

Refinement on F2	H-atom parameters constrained
Least-squares matrix: full	w = 1/[σ2(Fo2) + (0.0152P)2 + 0.9168P] where P = (Fo2 + 2Fc2)/3
R[F2 > 2σ(F2)] = 0.021	(Δ/σ)max = 0.001
wR(F2) = 0.052	Δρmax = 1.14 e Å−3
S = 1.08	Δρmin = −0.96 e Å−3
5560 reflections	Absolute structure: Flack x determined using 2423 quotients [(I+)-(I-)]/[(I+)+(I-)] (Parsons et al., 2013)
255 parameters	Absolute structure parameter: −0.004 (10)
1 restraint

Bis(L-leucinium) hexachloridostannate(IV) dihydrate . 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.

Refinement. Hydrogen atom positions were located in the difference Fourier map, then placed in idealized positions and refined using a riding model, with their displacement parameters set relative to those of their parent atoms. Key experimental parameters and refinement details are provided in the accompanying table.

Bis(L-leucinium) hexachloridostannate(IV) dihydrate . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Sn1	0.49452 (2)	0.82589 (8)	0.24933 (3)	0.01803 (6)
Cl5	0.50217 (10)	0.62101 (9)	0.15898 (10)	0.0274 (2)
Cl2	0.58501 (10)	0.74656 (10)	0.45596 (10)	0.0300 (2)
Cl4	0.40557 (10)	0.90459 (10)	0.04246 (10)	0.0279 (2)
Cl1	0.28821 (10)	0.78517 (11)	0.28989 (12)	0.0362 (3)
Cl6	0.48614 (11)	1.03090 (9)	0.33714 (10)	0.0285 (2)
Cl3	0.70110 (9)	0.86564 (11)	0.21024 (11)	0.0332 (3)
O2B	0.6272 (3)	0.2663 (3)	0.2471 (3)	0.0309 (7)
O1B	0.8180 (2)	0.3081 (4)	0.2165 (3)	0.0317 (7)
H1B	0.805837	0.244024	0.171470	0.048*
O2W	0.7671 (3)	0.1178 (4)	0.0630 (3)	0.0370 (8)
H2WA	0.741271	0.045743	0.083037	0.055*
H2WB	0.721040	0.133722	−0.010916	0.055*
O1A	0.1824 (3)	0.3717 (3)	0.2622 (3)	0.0356 (9)
H1A	0.201961	0.416162	0.327006	0.053*
N1B	0.6272 (3)	0.4429 (4)	0.4137 (3)	0.0211 (7)
H1BA	0.558359	0.422507	0.354275	0.025*
H1BB	0.618522	0.521155	0.442085	0.025*
H1BC	0.636197	0.388650	0.479181	0.025*
O1W	0.2364 (3)	0.5357 (4)	0.4443 (3)	0.0368 (8)
H1WA	0.295281	0.499525	0.498906	0.055*
H1WB	0.267860	0.596358	0.408457	0.055*
N1A	0.3796 (3)	0.2222 (4)	0.0820 (3)	0.0245 (8)
H1AA	0.375746	0.212276	−0.001998	0.029*
H1AB	0.399377	0.148537	0.122200	0.029*
H1AC	0.438963	0.279448	0.113534	0.029*
C4A	0.1241 (3)	0.0902 (4)	−0.0217 (4)	0.0235 (9)
H4A	0.199029	0.069140	−0.056190	0.028*
O2A	0.3855 (3)	0.3808 (4)	0.2660 (3)	0.0297 (7)
C1B	0.7214 (3)	0.3273 (7)	0.2674 (3)	0.0214 (7)
C5B	0.9132 (4)	0.6561 (5)	0.4828 (5)	0.0380 (11)
H5BA	0.924071	0.725335	0.542663	0.057*
H5BB	0.843498	0.673945	0.412213	0.057*
H5BC	0.989605	0.645129	0.451034	0.057*
C5A	0.0377 (4)	0.1692 (5)	−0.1179 (4)	0.0342 (10)
H5AA	0.015946	0.124339	−0.198095	0.051*
H5AB	0.079523	0.247040	−0.130280	0.051*
H5AC	−0.038261	0.187265	−0.087508	0.051*
C6B	0.9955 (4)	0.5050 (5)	0.6554 (4)	0.0411 (12)
H6BA	1.068981	0.487570	0.620531	0.062*
H6BB	0.974653	0.431433	0.699814	0.062*
H6BC	1.013350	0.574610	0.714509	0.062*
C6A	0.0592 (4)	−0.0310 (4)	0.0008 (5)	0.0313 (9)
H6AA	−0.014605	−0.012152	0.034615	0.047*
H6AB	0.116771	−0.082361	0.061285	0.047*
H6AC	0.034027	−0.075865	−0.079050	0.047*
C3A	0.1681 (3)	0.1569 (4)	0.1045 (3)	0.0240 (7)
H3AA	0.093960	0.187346	0.133558	0.029*
H3AB	0.210690	0.095956	0.167339	0.029*
C4B	0.8860 (4)	0.5380 (5)	0.5489 (4)	0.0274 (9)
H4B	0.811157	0.552556	0.585628	0.033*
C2A	0.2556 (3)	0.2656 (4)	0.1022 (3)	0.0219 (7)
H2A	0.217645	0.319994	0.029534	0.026*
C3B	0.8591 (3)	0.4281 (4)	0.4578 (3)	0.0235 (7)
H3BA	0.930140	0.418688	0.415750	0.028*
H3BB	0.854849	0.351957	0.507577	0.028*
C2B	0.7402 (3)	0.4372 (3)	0.3568 (3)	0.0198 (7)
H2B	0.743701	0.514475	0.306735	0.024*
C1A	0.2819 (3)	0.3453 (5)	0.2205 (4)	0.0206 (10)

Bis(L-leucinium) hexachloridostannate(IV) dihydrate . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
Sn1	0.02014 (10)	0.01690 (10)	0.01714 (9)	0.00183 (9)	0.00416 (6)	0.00103 (6)
Cl5	0.0400 (5)	0.0191 (5)	0.0216 (5)	0.0049 (4)	0.0034 (4)	−0.0014 (4)
Cl2	0.0463 (6)	0.0236 (6)	0.0180 (5)	0.0054 (4)	0.0025 (4)	0.0018 (5)
Cl4	0.0347 (5)	0.0249 (6)	0.0208 (5)	0.0069 (4)	−0.0017 (4)	0.0037 (5)
Cl1	0.0262 (5)	0.0373 (7)	0.0479 (7)	−0.0030 (4)	0.0144 (4)	0.0040 (5)
Cl6	0.0451 (6)	0.0177 (5)	0.0243 (5)	0.0020 (4)	0.0108 (4)	−0.0003 (5)
Cl3	0.0214 (4)	0.0423 (8)	0.0365 (6)	−0.0018 (4)	0.0076 (4)	0.0016 (5)
O2B	0.0273 (14)	0.0302 (17)	0.0378 (17)	−0.0067 (13)	0.0124 (12)	−0.0103 (15)
O1B	0.0242 (12)	0.043 (2)	0.0310 (14)	−0.0022 (13)	0.0118 (10)	−0.0100 (15)
O2W	0.0369 (17)	0.040 (2)	0.0329 (18)	0.0103 (15)	0.0050 (14)	−0.0023 (17)
O1A	0.0240 (13)	0.045 (2)	0.0383 (17)	−0.0010 (12)	0.0077 (12)	−0.0157 (15)
N1B	0.0181 (14)	0.0225 (18)	0.0216 (16)	0.0006 (13)	0.0017 (12)	−0.0006 (15)
O1W	0.0373 (17)	0.040 (2)	0.0320 (18)	0.0051 (15)	0.0046 (14)	−0.0062 (17)
N1A	0.0205 (15)	0.028 (2)	0.0271 (18)	−0.0009 (14)	0.0086 (13)	−0.0004 (16)
C4A	0.0170 (16)	0.028 (2)	0.0248 (19)	0.0019 (14)	0.0029 (14)	−0.0025 (16)
O2A	0.0222 (13)	0.0346 (18)	0.0308 (16)	−0.0059 (12)	0.0022 (12)	−0.0057 (14)
C1B	0.0194 (14)	0.0223 (18)	0.0229 (16)	0.0035 (19)	0.0052 (12)	0.004 (2)
C5B	0.031 (2)	0.033 (3)	0.048 (3)	−0.0072 (18)	0.0033 (19)	−0.004 (2)
C5A	0.032 (2)	0.034 (2)	0.033 (2)	−0.0001 (18)	−0.0029 (17)	0.0020 (19)
C6B	0.028 (2)	0.059 (3)	0.033 (2)	0.001 (2)	−0.0021 (18)	−0.004 (2)
C6A	0.026 (2)	0.029 (2)	0.038 (2)	−0.0026 (17)	0.0049 (17)	−0.0039 (18)
C3A	0.0216 (17)	0.0269 (19)	0.0234 (16)	−0.0024 (14)	0.0042 (13)	0.0026 (15)
C4B	0.0179 (17)	0.035 (2)	0.028 (2)	−0.0027 (16)	0.0015 (14)	−0.0082 (18)
C2A	0.0180 (15)	0.0249 (19)	0.0224 (17)	0.0003 (14)	0.0033 (13)	0.0015 (15)
C3B	0.0169 (15)	0.0259 (19)	0.0264 (17)	0.0040 (13)	0.0016 (14)	0.0011 (14)
C2B	0.0151 (15)	0.0201 (18)	0.0243 (17)	0.0002 (13)	0.0038 (13)	0.0026 (14)
C1A	0.0209 (15)	0.020 (3)	0.0202 (16)	0.0003 (15)	0.0029 (12)	0.0044 (16)

Bis(L-leucinium) hexachloridostannate(IV) dihydrate . Geometric parameters (Å, º)

Sn1—Cl5	2.4259 (13)	O2A—C1A	1.202 (5)
Sn1—Cl2	2.4084 (11)	C1B—C2B	1.517 (7)
Sn1—Cl4	2.4045 (11)	C5B—H5BA	0.9800
Sn1—Cl1	2.4387 (11)	C5B—H5BB	0.9800
Sn1—Cl6	2.4171 (14)	C5B—H5BC	0.9800
Sn1—Cl3	2.4338 (11)	C5B—C4B	1.523 (7)
O2B—C1B	1.206 (6)	C5A—H5AA	0.9800
O1B—H1B	0.8400	C5A—H5AB	0.9800
O1B—C1B	1.313 (4)	C5A—H5AC	0.9800
O2W—H2WA	0.8700	C6B—H6BA	0.9800
O2W—H2WB	0.8700	C6B—H6BB	0.9800
O1A—H1A	0.8400	C6B—H6BC	0.9800
O1A—C1A	1.301 (5)	C6B—C4B	1.522 (6)
N1B—H1BA	0.9100	C6A—H6AA	0.9800
N1B—H1BB	0.9100	C6A—H6AB	0.9800
N1B—H1BC	0.9100	C6A—H6AC	0.9800
N1B—C2B	1.502 (4)	C3A—H3AA	0.9900
O1W—H1WA	0.8704	C3A—H3AB	0.9900
O1W—H1WB	0.8696	C3A—C2A	1.519 (5)
N1A—H1AA	0.9100	C4B—H4B	1.0000
N1A—H1AB	0.9100	C4B—C3B	1.531 (6)
N1A—H1AC	0.9100	C2A—H2A	1.0000
N1A—C2A	1.500 (5)	C2A—C1A	1.521 (6)
C4A—H4A	1.0000	C3B—H3BA	0.9900
C4A—C5A	1.515 (6)	C3B—H3BB	0.9900
C4A—C6A	1.533 (6)	C3B—C2B	1.518 (5)
C4A—C3A	1.532 (5)	C2B—H2B	1.0000
Cl5—Sn1—Cl1	91.30 (5)	H5AA—C5A—H5AB	109.5
Cl5—Sn1—Cl3	88.62 (4)	H5AA—C5A—H5AC	109.5
Cl2—Sn1—Cl5	90.58 (5)	H5AB—C5A—H5AC	109.5
Cl2—Sn1—Cl1	89.00 (4)	H6BA—C6B—H6BB	109.5
Cl2—Sn1—Cl6	90.02 (4)	H6BA—C6B—H6BC	109.5
Cl2—Sn1—Cl3	90.58 (4)	H6BB—C6B—H6BC	109.5
Cl4—Sn1—Cl5	89.20 (4)	C4B—C6B—H6BA	109.5
Cl4—Sn1—Cl2	179.56 (5)	C4B—C6B—H6BB	109.5
Cl4—Sn1—Cl1	91.38 (4)	C4B—C6B—H6BC	109.5
Cl4—Sn1—Cl6	90.20 (5)	C4A—C6A—H6AA	109.5
Cl4—Sn1—Cl3	89.04 (4)	C4A—C6A—H6AB	109.5
Cl6—Sn1—Cl5	179.40 (5)	C4A—C6A—H6AC	109.5
Cl6—Sn1—Cl1	88.77 (4)	H6AA—C6A—H6AB	109.5
Cl6—Sn1—Cl3	91.32 (5)	H6AA—C6A—H6AC	109.5
Cl3—Sn1—Cl1	179.57 (6)	H6AB—C6A—H6AC	109.5
C1B—O1B—H1B	109.5	C4A—C3A—H3AA	108.4
H2WA—O2W—H2WB	104.5	C4A—C3A—H3AB	108.4
C1A—O1A—H1A	109.5	H3AA—C3A—H3AB	107.5
H1BA—N1B—H1BB	109.5	C2A—C3A—C4A	115.3 (3)
H1BA—N1B—H1BC	109.5	C2A—C3A—H3AA	108.4
H1BB—N1B—H1BC	109.5	C2A—C3A—H3AB	108.4
C2B—N1B—H1BA	109.5	C5B—C4B—H4B	108.5
C2B—N1B—H1BB	109.5	C5B—C4B—C3B	111.9 (4)
C2B—N1B—H1BC	109.5	C6B—C4B—C5B	110.6 (4)
H1WA—O1W—H1WB	109.5	C6B—C4B—H4B	108.5
H1AA—N1A—H1AB	109.5	C6B—C4B—C3B	108.8 (4)
H1AA—N1A—H1AC	109.5	C3B—C4B—H4B	108.5
H1AB—N1A—H1AC	109.5	N1A—C2A—C3A	111.1 (3)
C2A—N1A—H1AA	109.5	N1A—C2A—H2A	107.9
C2A—N1A—H1AB	109.5	N1A—C2A—C1A	106.5 (3)
C2A—N1A—H1AC	109.5	C3A—C2A—H2A	107.9
C5A—C4A—H4A	108.3	C3A—C2A—C1A	115.4 (3)
C5A—C4A—C6A	110.2 (3)	C1A—C2A—H2A	107.9
C5A—C4A—C3A	112.6 (4)	C4B—C3B—H3BA	108.3
C6A—C4A—H4A	108.3	C4B—C3B—H3BB	108.3
C3A—C4A—H4A	108.3	H3BA—C3B—H3BB	107.4
C3A—C4A—C6A	109.1 (3)	C2B—C3B—C4B	115.8 (3)
O2B—C1B—O1B	125.1 (6)	C2B—C3B—H3BA	108.3
O2B—C1B—C2B	122.5 (3)	C2B—C3B—H3BB	108.3
O1B—C1B—C2B	112.4 (4)	N1B—C2B—C1B	106.5 (3)
H5BA—C5B—H5BB	109.5	N1B—C2B—C3B	111.4 (3)
H5BA—C5B—H5BC	109.5	N1B—C2B—H2B	108.6
H5BB—C5B—H5BC	109.5	C1B—C2B—C3B	113.0 (3)
C4B—C5B—H5BA	109.5	C1B—C2B—H2B	108.6
C4B—C5B—H5BB	109.5	C3B—C2B—H2B	108.6
C4B—C5B—H5BC	109.5	O1A—C1A—C2A	113.3 (3)
C4A—C5A—H5AA	109.5	O2A—C1A—O1A	125.4 (4)
C4A—C5A—H5AB	109.5	O2A—C1A—C2A	121.3 (4)
C4A—C5A—H5AC	109.5
O2B—C1B—C2B—N1B	3.6 (6)	C5B—C4B—C3B—C2B	−66.6 (4)
O2B—C1B—C2B—C3B	126.2 (5)	C5A—C4A—C3A—C2A	−68.7 (4)
O1B—C1B—C2B—N1B	−176.4 (4)	C6B—C4B—C3B—C2B	170.9 (4)
O1B—C1B—C2B—C3B	−53.9 (5)	C6A—C4A—C3A—C2A	168.7 (3)
N1A—C2A—C1A—O1A	−168.7 (4)	C3A—C2A—C1A—O1A	−44.9 (5)
N1A—C2A—C1A—O2A	13.0 (6)	C3A—C2A—C1A—O2A	136.8 (4)
C4A—C3A—C2A—N1A	−68.6 (4)	C4B—C3B—C2B—N1B	−62.0 (4)
C4A—C3A—C2A—C1A	170.1 (3)	C4B—C3B—C2B—C1B	178.2 (3)

Bis(L-leucinium) hexachloridostannate(IV) dihydrate . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N1A—H1AA···Cl3i	0.91	2.78	3.470 (4)	133
N1A—H1AA···Cl5i	0.91	2.58	3.342 (4)	142
N1A—H1AB···Cl4ii	0.91	2.77	3.471 (4)	134
N1A—H1AB···Cl6ii	0.91	2.65	3.452 (4)	148
N1A—H1AC···O2A	0.91	2.17	2.620 (5)	110
N1A—H1AC···O2B	0.91	2.26	2.959 (5)	133
N1B—H1BA···O2A	0.91	1.99	2.873 (5)	164
N1B—H1BA···O2B	0.91	2.27	2.626 (5)	103
N1B—H1BB···Cl2	0.91	2.47	3.352 (4)	164
N1B—H1BC···Cl1iii	0.91	2.71	3.583 (4)	162
O1A—H1A···O1W	0.84	1.79	2.624 (5)	169
O1B—H1B···O2W	0.84	1.79	2.627 (6)	173
O1W—H1WA···Cl6iii	0.87	2.69	3.440 (3)	145
O1W—H1WB···Cl1	0.87	2.44	3.283 (4)	162
O2W—H2WA···Cl3ii	0.87	2.48	3.312 (4)	161
O2W—H2WB···Cl5i	0.87	2.63	3.393 (3)	147

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

Funding Statement

Funding for this research was provided by: Laboratoire de Technologie des Matériaux Avancés, Ecole Nationale Polytechnique de Constantine, Algérie ; Unité de Recherche de Chimie de l’Environnement, Moléculaire et Structurale UR.CHEMS ; DRSDT-Algeria .