Crystal structure of a pyrazine-2,3-dicarboxamide ligand and of its silver(I) nitrate complex, a three-dimensional coordination polymer

The reaction of the ligand N ²,N ³-bis­(pyridin-4-ylmeth­yl)pyrazine-2,3-dicarboxamide with silver(I) nitrate led to the formation of a three-dimensional coordination polymer.

Abstract

The title ligand, C₁₈H₁₆N₆O₂·2H₂O (L1) [N ²,N ³-bis­(pyridin-4-ylmeth­yl)pyrazine-2,3-dicarboxamide], crystallized as a dihydrate. The mol­ecule is U-shaped with the carboxamide groups being cis to one another, making a dihedral angle of 81.6 (5)°. The terminal pyridine rings are inclined to one another by 58.5 (4)°. There is an intra­molecular N—H⋯N_pyrazine hydrogen bond present, forming an S(5) ring motif. In the crystal, adjacent mol­ecules are linked by N—H⋯O_carboxamide hydrogen bonds, forming a chain along [001]. A chain of hydrogen-bonded water mol­ecules is linked to the chain of (L1) mol­ecules by O—H⋯N hydrogen bonds, forming columns propagating along the c axis. The columns are linked by C—H⋯O and C—H⋯N hydrogen bonds, forming a three-dimensional supra­molecular structure. The reaction of ligand (L1) with silver(I) nitrate led to the formation of a new three-dimensional coordination polymer, {[Ag(C₁₈H₁₆N₆O₂)]NO₃}_n, poly[[[μ₄-N ²,N ³-bis­(pyridin-4-ylmeth­yl)pyrazine-2,3-dicarboxamide]­silver(I)] nitrate] (I). The asymmetric unit is composed of half of one silver ion, located on a twofold rotation axis, half a ligand mol­ecule and half a positionally disordered nitrate anion located about a twofold rotation axis. The full mol­ecule of the ligand is generated by twofold rotational symmetry, with this twofold axis bis­ecting the C_ar—C_ar bonds of the pyrazine ring and the Ag—Ag bond. The carboxamide groups are now trans to one another, making a dihedral angle of 65.8 (4)°. The two terminal pyridine rings are inclined to one another by 6.6 (3)°. Two ligands wrap around an Ag—Ag bond of 3.1638 (11) Å, forming a figure-of-eight-shaped complex mol­ecule. Each silver ion is coordinated by two pyridine N atoms and by two carboxamide O atoms of neighbouring mol­ecules, hence forming a three-dimensional framework. The nitrate anion is linked to the framework by N—H⋯O and C—H⋯O hydrogen bonds.

Chemical context  

The title ligand, N ²,N ³-bis­(pyridin-4-ylmeth­yl)pyrazine-2,3-dicarboxamide (L1), is one of a series of ligands synthesized in order to study the superexchange in supra­molecular complexes formed using pyrazine carboxamide derivatives and first row transition metal ions (Cati, 2002 ▸; Cati et al., 2004 ▸). To the best of our knowledge, neither the synthesis nor the crystal structure of (L1) have been described previously. It is very similar to the ligand N ²,N ³-bis­(pyridin-2-ylmeth­yl)pyrazine-2,3-dicarboxamide (L2), for which a number of transition metal complexes have been described, including some inter­esting tetra­nuclear 2×2 grid-like and square complexes (Hausmann et al., 2003 ▸; Klingele et al., 2007 ▸). Two such complexes, {[Cu₄(L2)₄](ClO₄)₄}·5CH₃OH·4H₂O and {[Ni₄(L2)₄]Cl₄}·5CH₃CN·13H₂O (Cati et al., 2004 ▸), exhibit anion encapsulation, and magnetic susceptibility measurements indicate that they are weakly anti-ferromagnetic, with J values of −5.87 and −2.64 cm⁻¹, respectively.

A search of the Cambridge Structural Database (CSD; Groom et al., 2016 ▸), indicated that silver nitrate is an excellent metal salt for the formation of multi-dimensional coordination polymers. The silver ion can have multiple coordination geometries and modes, and the nitrate anion has been shown to coordinate to metal ions in a number of different modes, many of which involve bridging metal ions. The properties of the complexes formed are extremely varied. For example, with the tetra­dendate ligand 1,6-bis­(2H-1,2,3-triazol-2-yl)hexane, Huo et al. (2016 ▸) synthesized the three-dimensional coordin­ation polymer, catena-[[μ-2,2′-(butane-1,4-di­yl)bis­(2H-1,2,3-triazole)]bis­(μ-nitrato)disilver]. They showed that it exhibits highly selective and sensitive luminescence sensing of Cr₂O₇ ²⁻ ions in aqueous solution. With the rigid tripodal arene-core-based nitro­gen ligand, 1,3,5-tris­(pyrazol-1-yl)benzene, Shu et al. (2006 ▸) formed a porous metal–organic framework, viz. catena-[bis­(μ₃-nitrato-O,O′,O′′)bis­(μ₃-1,3,5-tris­(pyrazol-1-yl)benzene-N,N′,N′′)tris­ilver(I) nitrate]. The nitrate counter-anions located in the cationic framework can be exchanged reversibly without destruction of the structure. Hence, this compound can act as a zeolite-like porous material for anion exchange.

The title ligand has potentially two bidentate (N,N) and two monodentate (N_pyridine) coordination sites. It is therefore an inter­esting ligand to study its coordination behaviour with silver nitrate, and herein, we describe the solid state structures of ligand (L1), and the new three-dimensional coordination polymer, poly[[[μ₄-N ²,N ³-bis­(pyridin-4-ylmeth­yl)pyrazine-2,3-dicarboxamide]­silver(I)]nitrate] (I).

Structural commentary  

The title ligand (L1) crystallized as a dihydrate, and its mol­ecular structure is illustrated in Fig. 1 ▸. The mol­ecule is U-shaped with the carboxamide groups (C6/N3/C5/O1) being cis to one another, making a dihedral angle of 81.6 (5)°. The terminal pyridine rings (N4/C7–C11) are inclined to one another by 58.5 (4)°. There is an intra­molecular N—H⋯N hydrogen bond present, forming an S(5) ring motif (Fig. 1 ▸ and Table 1 ▸).

Figure 1.

A view of the mol­ecular structure of ligand (L1), with atom labelling. Displacement ellipsoids are drawn at the 50% probability level. The intra­molecular N—H⋯N contact is shown as a dashed line (see Table 2 ▸).

Table 1. Hydrogen-bond geometry (Å, °) for (L1) .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N3—H3N⋯N1	0.88 (3)	2.08 (5)	2.718 (7)	129 (5)
N5—H5N⋯O1i	0.88 (3)	2.05 (4)	2.858 (7)	151 (6)
O1W—H1WA⋯O2W ii	0.86	1.91	2.762 (7)	177
O1W—H1WB⋯N6iii	0.94	1.97	2.886 (7)	164
O2W—H2WA⋯O1W iv	0.86	1.91	2.765 (8)	172
O2W—H2WB⋯N4	0.85	2.06	2.888 (7)	164
C3—H3⋯O1W v	0.95	2.38	3.273 (8)	156
C4—H4⋯O2W vi	0.95	2.58	3.253 (8)	128
C6—H6A⋯N2vii	0.99	2.57	3.515 (8)	159
C16—H16⋯N4iv	0.95	2.60	3.451 (9)	149

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) ; (vi) ; (vii) .

The reaction of the ligand with silver(I) nitrate led to the formation of a three-dimensional coordination polymer (I). The coordination of the ligand to the silver ions is illustrated in Fig. 2 ▸. Selected bond lengths and angles in (I) are given in Table 2 ▸. The asymmetric unit is composed of a silver ion, located on a twofold rotation axis, half a ligand mol­ecule and half a nitrate anion. The full mol­ecule of the ligand is generated by twofold rotational symmetry, with this twofold axis bis­ecting the C4—C4ⁱ bonds of the pyrazine ring and the Ag1—Ag1ⁱ bond (Table 2 ▸). The carboxamide groups (C6/N3/C5/O1) are now trans to one another, making a dihedral angle of 65.8 (4)°. The terminal pyridine rings (N4/C7–C11) are inclined to one another by 6.6 (3)°. Two ligands effectively wrap around a Ag—Ag bond of 3.1638 (11) Å, forming a figure-of-eight-shaped mol­ecule, with each silver ion being coordinated by two pyridine N atoms. The silver ions are each further coordinated by the carboxamide O atom, O1, of neighbouring mol­ecules, hence forming a three-dimensional framework, illustrated in Fig. 3 ▸. If one considers that the silver ion, Ag1, is fivefold coordinate (N₂O₂Agⁱ) then its coordination sphere can be described as distorted trigonal–bipyramidal, with a τ₅ value of 0.8 (τ₅ = 1 for perfect trigonal–pyramidal geometry and 0 for perfect square-pyramidal geometry; Addison et al., 1984 ▸). However, if one considers the Ag1 ion to be fourfold coordinate, N₂O₂, with a τ₄ value of 0.55, its coordination sphere can be described as inter­mediate between trigonal–pyramidal and seesaw (τ₄ = 1 for a perfect tetra­hedral geometry and 0 for a perfect square-planar geometry. For inter­mediate structures, including trigonal–pyramidal and seesaw, τ₄ falls within the range of 0 to 1; Yang et al., 2007 ▸). The nitrate anion that does not coordinate to the silver(I) ion is positionally disordered, and also located about a twofold rotation axis.

Figure 2.

A view of the figure-eight arrangement of the title complex (I), with atom labelling for the asymmetric unit and some symmetry-related atoms (see Table 1 ▸ for details). The unlabelled atoms of the ligand on the left-hand-side of the figure are related to the labelled atoms by twofold rotational symmetry (symmetry operation: −x + , −y + , z). The nitrate anions have been omitted for clarity.

Table 2. Selected geometric parameters (Å, °) for (I) .

Ag1—Ag1i	3.1638 (11)	Ag1—O1ii	2.814 (5)
Ag1—N4	2.109 (5)
N4—Ag1—N4iii	173.0 (2)	O1ii—Ag1—N4	97.80 (15)
O1ii—Ag1—O1iv	109.48 (14)	O1iv—Ag1—N4	86.26 (15)
Ag1i—Ag1—N4	86.51 (14)	Ag1i—Ag1—O1ii	125.26 (10)

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

Figure 3.

A view along the c axis of the three-dimensional framework of complex (I), showing the Ag⋯O bonds as dashed lines (see Table 2 ▸). The nitrate anions and the C-bound H atoms have been omitted for clarity.

Supra­molecular features  

In the crystal of ligand (L1), mol­ecules are linked by N—H⋯O(water) hydrogen bonds forming chains propagating along the c-axis direction (Table 1 ▸ and Fig. 4 ▸). Parallel to this chain of mol­ecules is a chain of hydrogen-bonded water mol­ecules (Table 1 ▸ and Fig. 4 ▸), which is linked to the chain of (L1) mol­ecules by O—H⋯N hydrogen bonds, forming columns propagating along the c axis. The columns are linked by C—H⋯O and C—H⋯N hydrogen bonds, forming a three-dimensional supra­molecular structure (Table 1 ▸ and Fig. 5 ▸).

Figure 4.

A partial view along direction [111] of the crystal packing of ligand (L1). The hydrogen bonds are shown as dashed lines (see Table 1 ▸)

Figure 5.

A view along the a axis of the crystal packing of ligand (L1). The columns of (L1) mol­ecules, linked by hydrogen bonds involving the water mol­ecules, are indicated by blue circles. The hydrogen bonds are shown as dashed lines (see Table 1 ▸), and for clarity, only the H atoms involved in hydrogen bonding have been included.

In (I), the nitrate anion is situated in the cavities of the three-dimensional framework and is linked to the framework by N—H⋯O and C—H⋯O hydrogen bonds (Table 3 ▸ and Fig. 6 ▸). The nitrate anion in (I) is not essential for forming the three-dimensional structure, although it may act as a template for the formation of the framework (Batten et al., 2009 ▸). This is in contrast to the MOF catena-[bis­(μ₃-nitrato-O,O′,O′′)bis(μ₃-1,3,5-tris­(pyrazol-1-yl)benzene-N,N′,N′′)tris­ilver(I) nitrate] mentioned above (Shu et al., 2006 ▸), in which there are nitrate anions coordinating the silver ions in a μ₃ fashion and present also in the framework cavities. There are, of course, other examples reported in the Cambridge Structural Database (Groom et al., 2016 ▸).

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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N3—H3N⋯O11v	0.88	1.86	2.744 (14)	178
N3—H3N⋯O13v	0.88	2.26	2.875 (13)	127
C4—H4⋯O11vi	0.95	2.45	3.378 (13)	165
C4—H4⋯O14vii	0.95	2.40	3.33 (2)	168
C9—H9⋯O13viii	0.95	2.50	3.224 (14)	133
C11—H11⋯O13v	0.95	2.51	3.154 (13)	126

Symmetry codes: (v) ; (vi) ; (vii) ; (viii) .

Figure 6.

A view along the a axis of the crystal packing of complex (I), showing the Ag⋯O bonds as dashed lines (see Table 2 ▸). For clarity, all H atoms have been omitted.

In describing compound (I) as a three-dimensional coordination polymer, we make here the distinction between a coordination polymer and a metal–organic framework. Both have a three-dimensional framework but there are no cavities, even small ones, in the structure of (I). Hence, it should be classed as a three-dimensional coordination polymer according to the IUPAC recommendations on the ‘Terminology of metal–organic frameworks and coordination polymers’ (Batten et al., 2013 ▸).

Database survey  

A search of the Cambridge Structural Database (Version 5.38, update February 2017; Groom et al., 2016 ▸) for Ag–Ag complexes, excluding silver ion clusters of any kind, gave 321 hits. Limiting the search to Ag–Ag complexes with each silver ion coordinated by two pyridine N atoms, gave 95 hits. The Ag—Ag distances vary between ca 2.6–3.6 Å. One compound, bis­[μ₂-2,7-di-tert-butyl-9,9-dimethyl-N,N′-bis­[(3-pyrid­yl)meth­yl]xanthene-4,5-dicarboxamide]­disilver bis­(tri­fluoro­methane­sulfonate) chloro­form solvate (HIFKUD; Yue et al., 2007 ▸), is particularly inter­esting because it too involves a dicarboxamide ligand, viz. N,N′-bis­[(3-pyrid­yl)methy]xanth­ene-4,5-dicarboxamide), that wraps around an Ag—Ag bond forming a similar figure-of-eight-shaped complex. Here the Ag—Ag bond length is 3.134 (1) Å, slightly shorter than the value of 3.1638 (11) Å observed in (I); Table 2 ▸. A search for the benzene analogue of ligand (L1), N-(4-pyridyl­meth­yl)carbamo­yl)benzene, gave only two hits. Both of them are mercury(II) complexes, viz. the binuclear complex bis­{μ₂-1,2-bis­[N-(4-pyridyl­meth­yl)carbamo­yl]benzene}­tetra­kis­(tri­fluoro­acetato)­dimercury(II) methanol solvate (XAHSIJ; Burchell et al., 2004 ▸) and the two-dimensional network catena-[bis­{μ₂-1,2-bis­[N-(4-pyridyl­meth­yl)carbamo­yl]benzene}­dichlorido­mercury(II) 1,2-di­chloro­ethane solvate] (XAHSOP; Burchell et al., 2004 ▸). A search for the benzene analogue of ligand (L2), [N-(2-pyridyl­meth­yl)carbamo­yl]benzene, gave zero hits, while that for [N-(3-pyridyl­meth­yl)carbamo­yl]benzene gave eight hits. The latter includes the crystal structure of the dihydrate of the ligand itself (PANROM; Ge et al., 2005 ▸) and the structures of seven first-row transition metal one-, two- and three-dimensional coordination polymers.

Synthesis and crystallization  

Ligand (L1) was prepared using the same procedure as for ligand (L2) (Cati et al., 2004 ▸). Dimethyl pyrazine-2,3-di­carboxyl­ate (1.96 g, 10 mmol; Alvarez-Ibarra et al., 1994 ▸) and an excess of 4-(amino­meth­yl)pyridine (3.24 g, 30 mmol) in 35 ml of methanol were heated to reflux and heating was continued for 72 h in a two-necked flask (100 ml). The brown solution that formed was concentrated and 15 ml of water were added, which precipitated qu­anti­tatively ligand (L1). The solid was collected by filtration, washed with 10 ml of water and dried in air. Recrystallization in ethanol gave colourless plate-like crystals (yield is qu­anti­tative; m.p. 474 K). Spectroscopic data: ¹H NMR (400 MHz, DMSO-d6): 9.33 (t, 1H, J _hg = 6.1, Hh); 8.86 (s, 1H, Hn = Hm); 8.49 (dd, 2H, J _ba = 4.5, J _be = 1.5, Hb = Hd); 7.39 (dd, 2H, J _ab = 4.5, J _eb = 1.5, Ha = He); 4.52 (d, 2H, J _gh = 6.1, Hg). ¹³C NMR (400 MHz, DMSO-d6): 165.8, 150.3, 148.9, 147.6, 145.6, 123.0, 42.2. IR (KBr pellet, cm⁻¹): 3273 (s), 3031 (s), 1675 (vs), 1602 (vs), 1564 (vs), 1520 (vs), 1416 (vs), 1364 (s), 1311 (s), 1292 (s), 1220 (s), 1185 (m), 1164 (m), 1124 (s), 1069 (m), 995 (s), 871 (w), 830 (m), 787 (m), 745 (m), 715 (m), 611 (m), 575 (w), 504 (m), 495 (m), 475 (m). Elemental analysis for [C₁₈H₁₆N₆O₂]·H₂O (M _r = 366.39 g mol⁻¹): calculated: C: 59.01 H: 4.95 N: 22.94%; found: C: 59.10 H: 5.05 N: 23.10%.

Complex (I): A solution of (L1) (46 mg; 0.126 mmol) in 6 ml CHCl₃ was introduced into a 13 mm diameter glass tube. It was layered with methanol (ca 2 ml) used as a buffer zone. A solution of AgNO₃ (21 mg, 0.126 mmol) in MeOH (6 ml) was then added gently to avoid possible mixing. The glass tube was sealed with a perforated parafilm and left at room temperature. Colourless block-like crystals were obtained after a few days (yield 60 mg, 92%). Elemental analysis for AgC₁₈H₁₆N₇O₅: (M _r = 518.25 g mol⁻¹): calculated: C: 41.72 H: 3.11 N: 18.92%; found: C: 41.65 H: 3.09 N: 18.85%.

Refinement  

Crystal data, data collection and structure refinement details are summarized in Table 4 ▸. For the ligand (L1), the NH and water H atoms were located in difference-Fourier maps and refined with distance restraints: O—H = 0.85 (2) Å, N—H = 0.88 (2) Å with U _iso(H) = 1.5U _eq(O) and 1.2U _eq(N). In the final cycles of refinement, the water H atoms were treated as riding atoms. For complex (I), the NH H atoms were included in calculated positions and treated as riding: N—H = 0.88 Å with U _iso(H) = 1.2U _eq(N). For both compounds, the C-bound H atoms were included in calculated positions and refined as riding: C—H = 0.95–0.99 Å with U _iso(H) = 1.2U _eq(C). The nitrate anion is positionally disordered about a twofold rotation axis and was refined with fixed occupancies (N10A and N10B = 0.5, O11 and O13 = 0.5, O12 and O14 = 0.25), and all their ADP’s were made equal to that of atom O11. Using a one-circle image-plate diffraction system it is not possible to measure 100% of the Ewald sphere, particularly for triclinic or monoclinic systems. This is the case for ligand (L1), which crystallized in the monoclinic space group Pc and for which only 94.7% of the Ewald sphere was accessible.

Table 4. Experimental details.

	(L1)	(I)
Crystal data
Chemical formula	C18H16N6O2·2H2O	[Ag(C18H16N6O2)]NO3
M r	384.40	518.25
Crystal system, space group	Monoclinic, P c	Orthorhombic, F d d d
Temperature (K)	153	153
a, b, c (Å)	4.3677 (6), 14.0232 (12), 15.1816 (18)	14.9776 (16), 17.3228 (12), 29.570 (4)
α, β, γ (°)	90, 96.153 (16), 90	90, 90, 90
V (Å3)	924.50 (19)	7672.1 (14)
Z	2	16
Radiation type	Mo Kα	Mo Kα
μ (mm−1)	0.10	1.10
Crystal size (mm)	0.50 × 0.15 × 0.05	0.40 × 0.30 × 0.20
Data collection
Diffractometer	Stoe IPDS 1	Stoe IPDS 1
Absorption correction	Multi-scan (MULABS; Spek, 2009 ▸)	Multi-scan (MULABS; Spek, 2009 ▸)
T min, T max	0.763, 1.000	0.985, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	7134, 3388, 1693	13548, 1721, 1038
R int	0.107	0.096
(sin θ/λ)max (Å−1)	0.615	0.600
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.051, 0.122, 0.77	0.045, 0.107, 0.90
No. of reflections	3388	1721
No. of parameters	260	141
No. of restraints	8	0
H-atom treatment	H atoms treated by a mixture of independent and constrained refinement	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.21, −0.25	0.68, −0.65

Computer programs: EXPOSE, CELL and INTEGRATE in IPDS-I (Stoe & Cie, 2004 ▸), SHELXS2014 (Sheldrick, 2008 ▸), Mercury (Macrae et al., 2008 ▸), SHELXL2014 (Sheldrick, 2015 ▸), PLATON (Spek, 2009 ▸) and publCIF (Westrip, 2010 ▸).

Supplementary Material

CCDC references: 1546645, 1546644

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

supplementary crystallographic information

(L1) N²,N³-Bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide . Crystal data

C18H16N6O2·2H2O	F(000) = 404
Mr = 384.40	Dx = 1.381 Mg m−3
Monoclinic, Pc	Mo Kα radiation, λ = 0.71073 Å
a = 4.3677 (6) Å	Cell parameters from 3264 reflections
b = 14.0232 (12) Å	θ = 2.0–25.9°
c = 15.1816 (18) Å	µ = 0.10 mm−1
β = 96.153 (16)°	T = 153 K
V = 924.50 (19) Å3	Plate, colourless
Z = 2	0.50 × 0.15 × 0.05 mm

(L1) N²,N³-Bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide . Data collection

Stoe IPDS 1 diffractometer	3388 independent reflections
Radiation source: fine-focus sealed tube	1693 reflections with I > 2σ(I)
Plane graphite monochromator	Rint = 0.107
φ rotation scans	θmax = 25.9°, θmin = 2.0°
Absorption correction: multi-scan (MULABS; Spek, 2009)	h = −5→5
Tmin = 0.763, Tmax = 1.000	k = −17→16
7134 measured reflections	l = −18→18

(L1) N²,N³-Bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide . Refinement

Refinement on F2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: mixed
R[F2 > 2σ(F2)] = 0.051	H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.122	w = 1/[σ2(Fo2) + (0.0453P)2] where P = (Fo2 + 2Fc2)/3
S = 0.77	(Δ/σ)max < 0.001
3388 reflections	Δρmax = 0.21 e Å−3
260 parameters	Δρmin = −0.25 e Å−3
8 restraints	Extinction correction: (SHELXL2016; Sheldrick, 2015), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.036 (6)

(L1) N²,N³-Bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide . 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.

(L1) N²,N³-Bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
O1	0.7750 (11)	0.9108 (3)	0.4491 (3)	0.0358 (13)
O2	0.5478 (11)	0.9994 (3)	0.2578 (3)	0.0351 (12)
N1	0.4263 (14)	1.1135 (3)	0.5363 (4)	0.0321 (15)
N2	0.1716 (14)	1.1331 (4)	0.3588 (4)	0.0330 (15)
N3	0.7147 (13)	0.9491 (3)	0.5921 (3)	0.0258 (14)
H3N	0.612 (13)	0.998 (3)	0.609 (4)	0.031*
N4	0.4923 (14)	0.5966 (4)	0.6225 (4)	0.0403 (16)
N5	0.1699 (14)	0.9119 (4)	0.3107 (4)	0.0313 (14)
H5N	0.002 (11)	0.906 (5)	0.337 (4)	0.038*
N6	−0.0999 (16)	0.5615 (4)	0.3180 (4)	0.0436 (17)
C1	0.4668 (15)	1.0457 (4)	0.4743 (4)	0.0267 (17)
C2	0.3401 (16)	1.0564 (4)	0.3878 (4)	0.0258 (16)
C3	0.1396 (19)	1.1999 (5)	0.4209 (5)	0.043 (2)
H3	0.030625	1.256737	0.403978	0.051*
C4	0.2586 (18)	1.1888 (4)	0.5079 (5)	0.0360 (19)
H4	0.219526	1.236935	0.549295	0.043*
C5	0.6613 (15)	0.9624 (4)	0.5039 (4)	0.0280 (16)
C6	0.9192 (16)	0.8748 (4)	0.6312 (5)	0.0290 (17)
H6A	0.985533	0.891453	0.693707	0.035*
H6B	1.105193	0.872221	0.599314	0.035*
C7	0.7688 (16)	0.7778 (4)	0.6278 (5)	0.0307 (17)
C8	0.8016 (18)	0.7151 (4)	0.5602 (5)	0.0376 (19)
H8	0.917205	0.733033	0.513344	0.045*
C9	0.669 (2)	0.6270 (5)	0.5600 (5)	0.046 (2)
H9	0.702062	0.584555	0.513239	0.056*
C10	0.4698 (19)	0.6573 (5)	0.6889 (5)	0.044 (2)
H10	0.357252	0.636975	0.735668	0.053*
C11	0.5967 (17)	0.7473 (5)	0.6950 (5)	0.0374 (19)
H11	0.568042	0.787610	0.743743	0.045*
C12	0.3639 (17)	0.9848 (4)	0.3138 (4)	0.0297 (17)
C13	0.1367 (17)	0.8444 (4)	0.2372 (5)	0.0337 (18)
H13A	0.332934	0.841179	0.210178	0.040*
H13B	−0.024426	0.867753	0.191430	0.040*
C14	0.0529 (17)	0.7469 (4)	0.2655 (4)	0.0303 (17)
C15	−0.1501 (17)	0.6908 (5)	0.2141 (5)	0.0362 (18)
H15	−0.242090	0.714271	0.158778	0.043*
C16	−0.224 (2)	0.6001 (5)	0.2413 (5)	0.049 (2)
H16	−0.368187	0.563552	0.204091	0.058*
C17	0.1048 (19)	0.6151 (5)	0.3680 (6)	0.042 (2)
H17	0.200289	0.589113	0.421904	0.050*
C18	0.1843 (19)	0.7075 (5)	0.3446 (5)	0.0389 (18)
H18	0.327922	0.743333	0.382699	0.047*
O1W	0.7645 (12)	0.5986 (3)	0.9268 (3)	0.0503 (15)
H1WA	0.624209	0.595327	0.962023	0.075*
H1WB	0.768245	0.545186	0.889768	0.075*
O2W	0.3065 (12)	0.4183 (3)	0.5379 (3)	0.0478 (14)
H2WA	0.133161	0.418283	0.504471	0.072*
H2WB	0.327355	0.474826	0.557396	0.072*

(L1) N²,N³-Bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
O1	0.051 (3)	0.039 (3)	0.021 (3)	0.009 (2)	0.019 (3)	0.000 (2)
O2	0.052 (3)	0.040 (2)	0.015 (3)	−0.005 (2)	0.015 (2)	−0.0003 (19)
N1	0.055 (4)	0.024 (3)	0.018 (3)	0.001 (3)	0.007 (3)	−0.002 (2)
N2	0.050 (4)	0.030 (3)	0.019 (3)	0.006 (3)	0.004 (3)	0.003 (2)
N3	0.041 (4)	0.025 (3)	0.012 (3)	0.004 (3)	0.009 (3)	−0.001 (2)
N4	0.047 (4)	0.032 (3)	0.041 (4)	0.001 (3)	0.001 (4)	0.007 (3)
N5	0.038 (4)	0.034 (3)	0.023 (3)	−0.010 (3)	0.006 (3)	−0.006 (2)
N6	0.054 (4)	0.033 (3)	0.044 (4)	−0.005 (3)	0.007 (4)	−0.003 (3)
C1	0.035 (5)	0.029 (3)	0.018 (4)	−0.002 (3)	0.009 (3)	0.001 (3)
C2	0.034 (4)	0.025 (3)	0.020 (4)	0.000 (3)	0.008 (3)	0.000 (3)
C3	0.061 (6)	0.027 (4)	0.040 (5)	0.011 (4)	0.003 (4)	0.003 (3)
C4	0.060 (5)	0.025 (4)	0.023 (4)	0.007 (4)	0.009 (4)	−0.003 (3)
C5	0.037 (4)	0.031 (4)	0.017 (4)	−0.001 (3)	0.006 (3)	0.008 (3)
C6	0.036 (4)	0.031 (4)	0.020 (4)	0.006 (3)	0.001 (3)	0.000 (3)
C7	0.032 (5)	0.030 (4)	0.027 (4)	0.013 (3)	−0.007 (4)	−0.002 (3)
C8	0.056 (5)	0.034 (4)	0.022 (5)	0.001 (4)	0.001 (4)	−0.001 (3)
C9	0.066 (6)	0.031 (4)	0.040 (5)	0.005 (4)	0.001 (5)	−0.005 (3)
C10	0.057 (6)	0.037 (4)	0.039 (5)	0.007 (4)	0.009 (4)	0.007 (4)
C11	0.053 (5)	0.035 (4)	0.024 (4)	0.002 (4)	0.006 (4)	−0.001 (3)
C12	0.047 (5)	0.027 (4)	0.015 (4)	0.007 (3)	−0.002 (4)	0.001 (3)
C13	0.047 (5)	0.029 (3)	0.025 (4)	−0.003 (3)	0.003 (4)	−0.007 (3)
C14	0.038 (5)	0.029 (3)	0.025 (5)	0.005 (3)	0.006 (4)	−0.005 (3)
C15	0.047 (5)	0.035 (4)	0.028 (4)	0.005 (4)	0.007 (4)	−0.003 (3)
C16	0.063 (6)	0.040 (4)	0.042 (5)	−0.008 (4)	0.000 (5)	−0.004 (4)
C17	0.052 (5)	0.038 (4)	0.038 (5)	0.001 (4)	0.012 (4)	0.003 (4)
C18	0.041 (5)	0.040 (4)	0.036 (5)	−0.003 (4)	0.002 (4)	−0.006 (3)
O1W	0.066 (4)	0.036 (3)	0.051 (4)	−0.006 (3)	0.013 (3)	−0.001 (2)
O2W	0.061 (4)	0.036 (3)	0.047 (3)	0.000 (2)	0.007 (3)	0.001 (2)

(L1) N²,N³-Bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide . Geometric parameters (Å, º)

O1—C5	1.245 (7)	C6—H6B	0.9900
O2—C12	1.248 (7)	C7—C8	1.370 (9)
N1—C4	1.331 (8)	C7—C11	1.398 (9)
N1—C1	1.364 (8)	C8—C9	1.364 (10)
N2—C3	1.346 (9)	C8—H8	0.9500
N2—C2	1.351 (8)	C9—H9	0.9500
N3—C5	1.347 (8)	C10—C11	1.378 (10)
N3—C6	1.456 (8)	C10—H10	0.9500
N3—H3N	0.88 (3)	C11—H11	0.9500
N4—C10	1.330 (9)	C13—C14	1.491 (8)
N4—C9	1.354 (10)	C13—H13A	0.9900
N5—C12	1.325 (8)	C13—H13B	0.9900
N5—C13	1.458 (8)	C14—C15	1.366 (10)
N5—H5N	0.88 (3)	C14—C18	1.389 (10)
N6—C17	1.340 (10)	C15—C16	1.386 (9)
N6—C16	1.344 (10)	C15—H15	0.9500
C1—C2	1.377 (9)	C16—H16	0.9500
C1—C5	1.485 (8)	C17—C18	1.397 (10)
C2—C12	1.518 (9)	C17—H17	0.9500
C3—C4	1.375 (10)	C18—H18	0.9500
C3—H3	0.9500	O1W—H1WA	0.8569
C4—H4	0.9500	O1W—H1WB	0.9371
C6—C7	1.510 (9)	O2W—H2WA	0.8649
C6—H6A	0.9900	O2W—H2WB	0.8483
C4—N1—C1	115.9 (6)	C7—C8—H8	119.9
C3—N2—C2	114.8 (6)	N4—C9—C8	123.9 (7)
C5—N3—C6	122.5 (5)	N4—C9—H9	118.1
C5—N3—H3N	99 (4)	C8—C9—H9	118.1
C6—N3—H3N	139 (5)	N4—C10—C11	125.2 (7)
C10—N4—C9	115.0 (6)	N4—C10—H10	117.4
C12—N5—C13	122.6 (6)	C11—C10—H10	117.4
C12—N5—H5N	128 (4)	C10—C11—C7	118.3 (6)
C13—N5—H5N	106 (4)	C10—C11—H11	120.8
C17—N6—C16	116.6 (6)	C7—C11—H11	120.8
N1—C1—C2	120.9 (6)	O2—C12—N5	123.9 (6)
N1—C1—C5	116.8 (6)	O2—C12—C2	119.7 (6)
C2—C1—C5	122.2 (5)	N5—C12—C2	116.2 (6)
N2—C2—C1	123.1 (5)	N5—C13—C14	112.5 (6)
N2—C2—C12	111.4 (6)	N5—C13—H13A	109.1
C1—C2—C12	125.5 (6)	C14—C13—H13A	109.1
N2—C3—C4	122.5 (7)	N5—C13—H13B	109.1
N2—C3—H3	118.7	C14—C13—H13B	109.1
C4—C3—H3	118.7	H13A—C13—H13B	107.8
N1—C4—C3	122.6 (6)	C15—C14—C18	116.6 (6)
N1—C4—H4	118.7	C15—C14—C13	121.9 (6)
C3—C4—H4	118.7	C18—C14—C13	121.5 (6)
O1—C5—N3	123.0 (6)	C14—C15—C16	121.0 (7)
O1—C5—C1	120.7 (6)	C14—C15—H15	119.5
N3—C5—C1	116.3 (5)	C16—C15—H15	119.5
N3—C6—C7	112.7 (6)	N6—C16—C15	122.9 (7)
N3—C6—H6A	109.1	N6—C16—H16	118.6
C7—C6—H6A	109.1	C15—C16—H16	118.6
N3—C6—H6B	109.1	N6—C17—C18	123.0 (8)
C7—C6—H6B	109.1	N6—C17—H17	118.5
H6A—C6—H6B	107.8	C18—C17—H17	118.5
C8—C7—C11	117.3 (6)	C14—C18—C17	119.9 (7)
C8—C7—C6	121.6 (6)	C14—C18—H18	120.1
C11—C7—C6	121.1 (6)	C17—C18—H18	120.1
C9—C8—C7	120.3 (7)	H1WA—O1W—H1WB	113.1
C9—C8—H8	119.9	H2WA—O2W—H2WB	105.0
C4—N1—C1—C2	0.2 (9)	C7—C8—C9—N4	2.1 (12)
C4—N1—C1—C5	178.1 (6)	C9—N4—C10—C11	3.4 (12)
C3—N2—C2—C1	0.9 (10)	N4—C10—C11—C7	−1.4 (12)
C3—N2—C2—C12	179.9 (6)	C8—C7—C11—C10	−0.5 (11)
N1—C1—C2—N2	0.3 (10)	C6—C7—C11—C10	−178.9 (6)
C5—C1—C2—N2	−177.6 (6)	C13—N5—C12—O2	−4.5 (10)
N1—C1—C2—C12	−178.5 (6)	C13—N5—C12—C2	171.7 (6)
C5—C1—C2—C12	3.6 (10)	N2—C2—C12—O2	78.2 (8)
C2—N2—C3—C4	−2.5 (11)	C1—C2—C12—O2	−102.8 (8)
C1—N1—C4—C3	−1.8 (10)	N2—C2—C12—N5	−98.1 (7)
N2—C3—C4—N1	3.2 (12)	C1—C2—C12—N5	80.8 (9)
C6—N3—C5—O1	2.1 (10)	C12—N5—C13—C14	148.9 (6)
C6—N3—C5—C1	−175.4 (5)	N5—C13—C14—C15	141.5 (7)
N1—C1—C5—O1	−161.3 (6)	N5—C13—C14—C18	−40.3 (9)
C2—C1—C5—O1	16.6 (9)	C18—C14—C15—C16	1.4 (10)
N1—C1—C5—N3	16.2 (8)	C13—C14—C15—C16	179.6 (6)
C2—C1—C5—N3	−165.8 (6)	C17—N6—C16—C15	−0.6 (11)
C5—N3—C6—C7	−79.3 (7)	C14—C15—C16—N6	−0.9 (12)
N3—C6—C7—C8	94.4 (7)	C16—N6—C17—C18	1.6 (11)
N3—C6—C7—C11	−87.3 (8)	C15—C14—C18—C17	−0.4 (10)
C11—C7—C8—C9	0.1 (11)	C13—C14—C18—C17	−178.7 (6)
C6—C7—C8—C9	178.5 (7)	N6—C17—C18—C14	−1.2 (11)
C10—N4—C9—C8	−3.8 (11)

(L1) N²,N³-Bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N3—H3N···N1	0.88 (3)	2.08 (5)	2.718 (7)	129 (5)
N5—H5N···O1i	0.88 (3)	2.05 (4)	2.858 (7)	151 (6)
O1W—H1WA···O2Wii	0.86	1.91	2.762 (7)	177
O1W—H1WB···N6iii	0.94	1.97	2.886 (7)	164
O2W—H2WA···O1Wiv	0.86	1.91	2.765 (8)	172
O2W—H2WB···N4	0.85	2.06	2.888 (7)	164
C3—H3···O1Wv	0.95	2.38	3.273 (8)	156
C4—H4···O2Wvi	0.95	2.58	3.253 (8)	128
C6—H6A···N2vii	0.99	2.57	3.515 (8)	159
C16—H16···N4iv	0.95	2.60	3.451 (9)	149

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

(I) Poly[[[µ₄-N²,N³-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide]silver(I)] nitrate] . Crystal data

[Ag(C18H16N6O2)]NO3	Dx = 1.795 Mg m−3
Mr = 518.25	Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, Fddd	Cell parameters from 6115 reflections
a = 14.9776 (16) Å	θ = 1.9–25.9°
b = 17.3228 (12) Å	µ = 1.10 mm−1
c = 29.570 (4) Å	T = 153 K
V = 7672.1 (14) Å3	Block, colourless
Z = 16	0.40 × 0.30 × 0.20 mm
F(000) = 4160

(I) Poly[[[µ₄-N²,N³-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide]silver(I)] nitrate] . Data collection

Stoe IPDS 1 diffractometer	1721 independent reflections
Radiation source: fine-focus sealed tube	1038 reflections with I > 2σ(I)
Plane graphite monochromator	Rint = 0.096
φ rotation scans	θmax = 25.3°, θmin = 2.7°
Absorption correction: multi-scan (MULABS; Spek, 2009)	h = −17→17
Tmin = 0.985, Tmax = 1.000	k = −20→20
13548 measured reflections	l = −35→35

(I) Poly[[[µ₄-N²,N³-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide]silver(I)] nitrate] . Refinement

Refinement on F2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.045	Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.107	H-atom parameters constrained
S = 0.90	w = 1/[σ2(Fo2) + (0.0575P)2] where P = (Fo2 + 2Fc2)/3
1721 reflections	(Δ/σ)max = 0.003
141 parameters	Δρmax = 0.68 e Å−3
0 restraints	Δρmin = −0.65 e Å−3

(I) Poly[[[µ₄-N²,N³-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide]silver(I)] nitrate] . Special details

Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell esds are taken into account in the estimation of distances, angles and torsion angles

(I) Poly[[[µ₄-N²,N³-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide]silver(I)] nitrate] . Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq	Occ. (<1)
Ag1	0.87500	0.96632 (4)	0.37500	0.0464 (2)
O1	0.9796 (3)	0.8101 (3)	0.14979 (13)	0.0483 (14)
N1	0.9673 (3)	0.8836 (3)	0.04722 (14)	0.0447 (18)
N3	1.0135 (3)	0.9361 (3)	0.14261 (16)	0.050 (2)
N4	0.9359 (3)	0.9589 (3)	0.31086 (16)	0.0427 (17)
C1	0.9207 (3)	0.8777 (4)	0.08584 (15)	0.0337 (16)
C4	0.9204 (4)	0.8805 (4)	0.00937 (17)	0.0453 (19)
C5	0.9745 (3)	0.8715 (4)	0.12935 (16)	0.0340 (18)
C6	1.0689 (4)	0.9393 (4)	0.18277 (18)	0.051 (2)
C7	1.0197 (4)	0.9446 (3)	0.22692 (19)	0.0437 (19)
C8	1.0640 (4)	0.9276 (4)	0.26675 (19)	0.045 (2)
C9	1.0221 (4)	0.9354 (4)	0.3075 (2)	0.046 (2)
C10	0.8921 (3)	0.9745 (3)	0.27201 (19)	0.043 (2)
C11	0.9302 (4)	0.9686 (4)	0.23033 (19)	0.0447 (19)
O11	0.9918 (8)	0.0666 (8)	0.0912 (4)	0.089 (3)	0.500
O12	1.0655 (16)	0.1323 (15)	0.1063 (6)	0.089 (3)	0.250
O13	0.9326 (9)	0.0862 (7)	0.1489 (4)	0.089 (3)	0.500
O14	0.9869 (18)	0.1233 (19)	0.1570 (7)	0.089 (3)	0.250
N10A	0.9614 (15)	0.12500	0.12500	0.089 (3)	0.500
N10B	0.9960 (16)	0.12500	0.12500	0.089 (3)	0.500
H4	0.95046	0.88600	−0.01873	0.0540*
H3N	1.00563	0.97838	0.12661	0.0600*
H6A	1.10904	0.98449	0.18023	0.0610*
H6B	1.10697	0.89253	0.18345	0.0610*
H8	1.12416	0.91024	0.26574	0.0540*
H9	1.05428	0.92399	0.33436	0.0560*
H10	0.83154	0.99047	0.27385	0.0520*
H11	0.89687	0.98062	0.20392	0.0530*

(I) Poly[[[µ₄-N²,N³-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide]silver(I)] nitrate] . Atomic displacement parameters (Ų)

	U11	U22	U33	U12	U13	U23
Ag1	0.0474 (4)	0.0397 (4)	0.0521 (4)	0.0000	0.0035 (4)	0.0000
O1	0.048 (2)	0.054 (3)	0.043 (2)	0.000 (2)	−0.005 (2)	0.010 (2)
N1	0.047 (3)	0.057 (4)	0.030 (2)	0.003 (3)	0.004 (2)	−0.004 (2)
N3	0.078 (4)	0.035 (4)	0.037 (3)	0.002 (3)	−0.015 (3)	−0.006 (2)
N4	0.042 (3)	0.039 (3)	0.047 (3)	0.001 (2)	−0.009 (2)	−0.006 (2)
C1	0.037 (2)	0.035 (3)	0.029 (3)	0.005 (3)	0.002 (2)	−0.010 (3)
C4	0.059 (3)	0.047 (4)	0.030 (3)	0.009 (4)	0.006 (2)	0.000 (3)
C5	0.030 (2)	0.046 (4)	0.026 (3)	0.005 (2)	0.010 (2)	−0.007 (4)
C6	0.062 (4)	0.057 (5)	0.033 (3)	−0.003 (3)	−0.008 (3)	−0.006 (3)
C7	0.051 (3)	0.036 (4)	0.044 (3)	−0.004 (3)	−0.012 (3)	−0.008 (3)
C8	0.046 (3)	0.044 (4)	0.045 (4)	0.007 (3)	−0.006 (3)	−0.004 (3)
C9	0.051 (4)	0.051 (4)	0.037 (3)	0.009 (3)	−0.008 (3)	0.000 (3)
C10	0.037 (4)	0.041 (4)	0.052 (3)	−0.004 (3)	−0.010 (3)	−0.006 (3)
C11	0.050 (3)	0.045 (4)	0.039 (3)	−0.001 (3)	−0.015 (3)	−0.008 (3)
O11	0.112 (6)	0.088 (6)	0.067 (4)	0.0000	0.0000	0.028 (4)
O12	0.112 (6)	0.088 (6)	0.067 (4)	0.0000	0.0000	0.028 (4)
O13	0.112 (6)	0.088 (6)	0.067 (4)	0.0000	0.0000	0.028 (4)
O14	0.112 (6)	0.088 (6)	0.067 (4)	0.0000	0.0000	0.028 (4)
N10A	0.112 (6)	0.088 (6)	0.067 (4)	0.0000	0.0000	0.028 (4)
N10B	0.112 (6)	0.088 (6)	0.067 (4)	0.0000	0.0000	0.028 (4)

(I) Poly[[[µ₄-N²,N³-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide]silver(I)] nitrate] . Geometric parameters (Å, º)

Ag1—Ag1i	3.1638 (11)	C8—C9	1.365 (8)
Ag1—N4	2.109 (5)	C10—C11	1.362 (8)
Ag1—O1ii	2.814 (5)	O11—N10A	1.493 (14)
Ag1—O1iii	2.814 (5)	O11—N10B	1.424 (13)
Ag1—N4iv	2.109 (5)	O11—O12	1.65 (3)
O1—C5	1.226 (8)	O12—N10B	1.19 (3)
N1—C1	1.342 (6)	O12—N10A	1.66 (3)
N1—C4	1.323 (7)	O13—N10A	1.066 (15)
N3—C5	1.322 (8)	O13—N10B	1.36 (2)
N3—C6	1.450 (7)	O13—O14	1.06 (3)
N4—C9	1.357 (8)	O14—N10B	0.96 (2)
N4—C10	1.350 (7)	O14—N10A	1.02 (2)
C1—C5	1.522 (6)	C4—H4	0.9500
C1—C1v	1.372 (6)	C6—H6B	0.9900
C4—C4v	1.373 (9)	C6—H6A	0.9900
N3—H3N	0.8800	C8—H8	0.9500
C6—C7	1.502 (8)	C9—H9	0.9500
C7—C8	1.384 (8)	C10—H10	0.9500
C7—C11	1.407 (8)	C11—H11	0.9500
N4—Ag1—N4iv	173.0 (2)	C6—C7—C8	119.5 (5)
O1ii—Ag1—O1iii	109.48 (14)	C6—C7—C11	123.2 (5)
Ag1i—Ag1—N4	86.51 (14)	C7—C8—C9	120.7 (6)
O1ii—Ag1—N4	97.80 (15)	N4—C9—C8	122.1 (5)
O1iii—Ag1—N4	86.26 (15)	N4—C10—C11	123.5 (5)
Ag1i—Ag1—O1ii	125.26 (10)	C7—C11—C10	119.1 (5)
Ag1i—Ag1—O1iii	125.26 (10)	C4v—C4—H4	119.00
Ag1i—Ag1—N4iv	86.51 (14)	N1—C4—H4	119.00
O1ii—Ag1—N4iv	86.26 (15)	N3—C6—H6B	108.00
O1iii—Ag1—N4iv	97.80 (15)	C7—C6—H6A	108.00
Ag1vi—O1—C5	114.9 (3)	H6A—C6—H6B	107.00
C1—N1—C4	116.2 (5)	C7—C6—H6B	108.00
C5—N3—C6	121.9 (5)	N3—C6—H6A	108.00
Ag1—N4—C9	119.7 (4)	C7—C8—H8	120.00
Ag1—N4—C10	122.9 (3)	C9—C8—H8	120.00
C9—N4—C10	117.4 (5)	C8—C9—H9	119.00
N1—C1—C5	116.7 (4)	N4—C9—H9	119.00
N1—C1—C1v	121.6 (4)	N4—C10—H10	118.00
C1v—C1—C5	121.6 (4)	C11—C10—H10	118.00
N1—C4—C4v	122.1 (5)	O11—N10A—O13	98.0 (8)
C5—N3—H3N	119.00	O13—N10A—N10B	113.9 (13)
C6—N3—H3N	119.00	O11—N10A—N10B	72.3 (9)
O1—C5—N3	124.1 (5)	O11—N10B—N10A	87.5 (11)
O1—C5—C1	120.7 (6)	O11—N10B—O13	89.0 (10)
N3—C5—C1	115.2 (5)	O13—N10B—N10A	45.8 (9)
N3—C6—C7	115.7 (5)	C7—C11—H11	120.00
C8—C7—C11	117.3 (5)	C10—C11—H11	120.00
Ag1i—Ag1—N4—C9	−71.9 (5)	N1—C1—C5—O1	−106.9 (6)
Ag1i—Ag1—N4—C10	106.2 (4)	N1—C1—C5—N3	73.3 (7)
O1ii—Ag1—N4—C9	163.0 (5)	C1v—C1—C5—O1	68.8 (8)
O1ii—Ag1—N4—C10	−19.0 (5)	C1v—C1—C5—N3	−111.0 (7)
O1iii—Ag1—N4—C9	53.8 (5)	N1—C1—C1v—N1v	5.5 (11)
O1iii—Ag1—N4—C10	−128.1 (5)	N1—C1—C1v—C5v	−170.1 (6)
Ag1vi—O1—C5—N3	−89.1 (5)	C5—C1—C1v—N1v	−170.1 (6)
Ag1vi—O1—C5—C1	91.1 (5)	C5—C1—C1v—C5v	14.4 (10)
C4—N1—C1—C5	172.9 (6)	N1—C4—C4v—N1v	4.5 (11)
C4—N1—C1—C1v	−2.9 (10)	N3—C6—C7—C8	163.0 (6)
C1—N1—C4—C4v	−1.9 (10)	N3—C6—C7—C11	−19.0 (9)
C6—N3—C5—O1	1.7 (8)	C6—C7—C8—C9	177.0 (6)
C6—N3—C5—C1	−178.5 (4)	C11—C7—C8—C9	−1.1 (9)
C5—N3—C6—C7	−79.7 (7)	C6—C7—C11—C10	−177.5 (6)
Ag1—N4—C9—C8	178.2 (5)	C8—C7—C11—C10	0.5 (9)
C10—N4—C9—C8	0.1 (9)	C7—C8—C9—N4	0.9 (10)
Ag1—N4—C10—C11	−178.8 (5)	N4—C10—C11—C7	0.4 (9)
C9—N4—C10—C11	−0.7 (9)

Symmetry codes: (i) x, −y+7/4, −z+3/4; (ii) x−1/4, y+1/4, −z+1/2; (iii) −x+2, y+1/4, z+1/4; (iv) −x+7/4, y, −z+3/4; (v) −x+7/4, −y+7/4, z; (vi) −x+2, y−1/4, z−1/4.

(I) Poly[[[µ₄-N²,N³-bis(pyridin-4-ylmethyl)pyrazine-2,3-dicarboxamide]silver(I)] nitrate] . Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N3—H3N···O11vii	0.88	1.86	2.744 (14)	178
N3—H3N···O13vii	0.88	2.26	2.875 (13)	127
C4—H4···O11viii	0.95	2.45	3.378 (13)	165
C4—H4···O14ix	0.95	2.40	3.33 (2)	168
C9—H9···O13x	0.95	2.50	3.224 (14)	133
C11—H11···O13vii	0.95	2.51	3.154 (13)	126

Symmetry codes: (vii) x, y+1, z; (viii) −x+2, −y+1, −z; (ix) −x+2, y+3/4, z−1/4; (x) x+1/4, y+3/4, −z+1/2.

Funding Statement

This work was funded by Swiss National Science Foundation grant . University of Neuchâtel. grant .