Diamminesilver(I) bis­(2-amino-5-nitro­benzoato-[kappa]²O¹,O^1')silver(I): a two-dimensional supra­molecular sheet with a short inter­sheet distance containing a rare four-coordinate planar silver(I) centre

The asymmetric unit of the title compound, [Ag(NH₃)₂][Ag(C₇H₅N₂O₄)₂], comprises half an [Ag(NH₃)₂]⁺ cation and half an [Ag(anbz)₂]^- anion (anbz is 2-amino-5-nitro­benzoate). Both Ag^I ions are located on inversion centres. The cation has a linear coordination geometry with two symmetry-related ammine ligands. The Ag^I cation in the anionic part shows a rare four-coordinate planar geometry completed by two chelating symmetry-related anbz ligands. Intra- and inter­molecular N-H...O hydrogen bonds create a slightly undulating two-dimensional supra­molecular sheet. Adjacent sheets are only ca 3.3 Å apart. Ag...O, Ag...N and [pi]-[pi] stacking inter­actions consolidate the packing of the mol­ecules in the solid state.

Computing details

Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell refinement: CrysAlis RED (Oxford Diffraction, 2008); data reduction: CrysAlis RED (Oxford Diffraction, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008) and publCIF (Westrip, 2010).

Diamminesilver(I) bis(2-amino-5-nitrobenzoato-κ²O¹,O¹')silver(I)

Crystal data

[Ag(NH3)2][Ag(C7H5N2O4)2]	Z = 1
Mr = 612.07	F(000) = 300
Triclinic, P1	Dx = 2.225 Mg m^−3
a = 7.1361 (5) Å	Mo Kα radiation, λ = 0.71073 Å
b = 7.4070 (6) Å	Cell parameters from 3627 reflections
c = 9.9686 (6) Å	θ = 3.1–30.4°
α = 87.064 (6)°	µ = 2.20 mm^−1
β = 79.170 (6)°	T = 173 K
γ = 62.077 (8)°	Block, colourless
V = 456.86 (6) Å^3	0.10 × 0.10 × 0.08 mm

Data collection

Oxford Xcalibur diffractometer with Sapphire3 Gemini Ultra detector	1800 independent reflections
Radiation source: Oxford Enhance (Mo) X-ray source	1627 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.014
Detector resolution: 16.1903 pixels mm^-1	θmax = 26.0°, θmin = 3.1°
ω scans	h = −8→8
Absorption correction: multi-scan [CrysAlisPro (Oxford Diffraction, 2009); empirical (using intensity measurements) absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm]	k = −9→8
Tmin = 0.810, Tmax = 0.843	l = −11→12
3721 measured reflections

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.017	Hydrogen site location: inferred from neighbouring sites
wR(F^2) = 0.048	H-atom parameters constrained
S = 1.07	w = 1/[σ^2(Fo^2) + (0.0303P)^2 + 0.1257P] where P = (Fo^2 + 2Fc^2)/3
1800 reflections	(Δ/σ)max < 0.001
140 parameters	Δρmax = 0.47 e Å^−3
0 restraints	Δρmin = −0.67 e Å^−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.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > 2sigma(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Ag1	1.0000	1.0000	0.0000	0.02992 (8)
Ag2	1.0000	0.5000	1.0000	0.03407 (8)
C1	0.4866 (3)	0.7740 (2)	0.43000 (19)	0.0215 (4)
H1A	0.4343	0.8069	0.3465	0.026*
C2	0.3679 (3)	0.7409 (3)	0.5431 (2)	0.0218 (4)
H2A	0.2307	0.7537	0.5377	0.026*
C3	0.4429 (3)	0.6881 (2)	0.66817 (18)	0.0171 (3)
C4	0.6448 (2)	0.6793 (2)	0.67621 (17)	0.0150 (3)
C5	0.7627 (2)	0.7147 (2)	0.56022 (17)	0.0163 (3)
H5A	0.8975	0.7084	0.5646	0.020*
C6	0.6876 (3)	0.7587 (2)	0.43890 (18)	0.0193 (4)
C7	0.7376 (2)	0.6277 (2)	0.80357 (17)	0.0159 (3)
N1	0.3238 (2)	0.6480 (2)	0.77528 (17)	0.0228 (3)
H1B	0.2000	0.6546	0.7672	0.027*
H1C	0.3698	0.6150	0.8534	0.027*
N2	0.8142 (2)	0.7948 (2)	0.32085 (16)	0.0239 (3)
N3	1.2634 (3)	0.8913 (2)	0.10419 (17)	0.0256 (3)
H3D	1.2650	0.9990	0.1430	0.031*
H3C	1.3890	0.8211	0.0439	0.031*
H3B	1.2494	0.8070	0.1705	0.031*
O1	0.9847 (2)	0.7918 (2)	0.33381 (14)	0.0295 (3)
O2	0.7486 (2)	0.8278 (2)	0.21135 (15)	0.0348 (3)
O3	0.90704 (19)	0.64409 (19)	0.80411 (13)	0.0224 (3)
O4	0.6493 (2)	0.5696 (2)	0.90552 (13)	0.0240 (3)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Ag1	0.02847 (12)	0.02926 (12)	0.02746 (13)	−0.00800 (9)	−0.00981 (9)	0.00019 (9)
Ag2	0.03202 (13)	0.05231 (15)	0.01693 (12)	−0.01760 (11)	−0.01052 (9)	0.00982 (9)
C1	0.0258 (9)	0.0168 (8)	0.0207 (9)	−0.0064 (7)	−0.0112 (7)	−0.0001 (7)
C2	0.0177 (8)	0.0205 (8)	0.0296 (10)	−0.0085 (7)	−0.0108 (7)	−0.0009 (7)
C3	0.0149 (7)	0.0134 (7)	0.0225 (9)	−0.0064 (6)	−0.0021 (6)	−0.0032 (6)
C4	0.0136 (7)	0.0132 (7)	0.0178 (8)	−0.0060 (6)	−0.0023 (6)	−0.0013 (6)
C5	0.0140 (7)	0.0139 (7)	0.0191 (8)	−0.0054 (6)	−0.0017 (6)	−0.0017 (6)
C6	0.0215 (8)	0.0151 (7)	0.0182 (9)	−0.0069 (7)	−0.0006 (7)	−0.0006 (6)
C7	0.0139 (7)	0.0156 (7)	0.0167 (8)	−0.0057 (6)	−0.0021 (6)	−0.0024 (6)
N1	0.0167 (7)	0.0326 (8)	0.0243 (8)	−0.0160 (6)	−0.0029 (6)	0.0002 (7)
N2	0.0289 (8)	0.0170 (7)	0.0174 (8)	−0.0057 (6)	0.0006 (6)	0.0007 (6)
N3	0.0284 (8)	0.0288 (8)	0.0209 (8)	−0.0145 (7)	−0.0047 (6)	0.0023 (6)
O1	0.0273 (7)	0.0316 (7)	0.0251 (7)	−0.0136 (6)	0.0045 (5)	0.0015 (6)
O2	0.0441 (8)	0.0330 (7)	0.0177 (7)	−0.0112 (6)	−0.0041 (6)	0.0046 (6)
O3	0.0203 (6)	0.0344 (7)	0.0199 (6)	−0.0179 (5)	−0.0072 (5)	0.0033 (5)
O4	0.0221 (6)	0.0355 (7)	0.0166 (6)	−0.0159 (6)	−0.0027 (5)	0.0059 (5)

Geometric parameters (Å, º)

Ag1—N3^i	2.1193 (16)	C4—C5	1.387 (2)
Ag1—N3	2.1193 (16)	C4—C7	1.492 (2)
Ag1—O2	3.1195 (15)	C5—C6	1.377 (3)
Ag1—N1^ii	3.1885 (16)	C5—H5A	0.9500
Ag2—O3	2.2367 (12)	C6—N2	1.437 (2)
Ag2—O3^iii	2.2367 (12)	C7—O4	1.259 (2)
Ag2—O4	2.6541 (13)	C7—O3	1.2716 (19)
Ag2—O2^iv	2.9287 (15)	N1—H1B	0.8800
C1—C2	1.362 (3)	N1—H1C	0.8800
C1—C6	1.405 (3)	N2—O2	1.236 (2)
C1—H1A	0.9500	N2—O1	1.237 (2)
C2—C3	1.414 (3)	N3—H3D	0.9100
C2—H2A	0.9500	N3—H3C	0.9100
C3—N1	1.347 (2)	N3—H3B	0.9100
C3—C4	1.429 (2)
N3^i—Ag1—N3	180.0	C6—C5—C4	121.08 (15)
N3^i—Ag1—O2	86.84 (5)	C6—C5—H5A	119.5
N3—Ag1—O2	93.16 (5)	C4—C5—H5A	119.5
N3^i—Ag1—N1^ii	94.79 (5)	C5—C6—C1	120.84 (16)
N3—Ag1—N1^ii	85.21 (5)	C5—C6—N2	119.51 (16)
O2—Ag1—N1^ii	108.73 (4)	C1—C6—N2	119.63 (16)
O3—Ag2—O3^iii	180.000 (1)	O4—C7—O3	122.16 (16)
O3—Ag2—O4	53.02 (4)	O4—C7—C4	120.22 (14)
O3^iii—Ag2—O4	126.98 (4)	O3—C7—C4	117.62 (14)
O3—Ag2—O2^iv	74.82 (4)	C3—N1—H1B	120.0
O3^iii—Ag2—O2^iv	105.18 (4)	C3—N1—H1C	120.0
O4—Ag2—O2^iv	88.11 (4)	H1B—N1—H1C	120.0
C2—C1—C6	118.92 (16)	O2—N2—O1	122.86 (16)
C2—C1—H1A	120.5	O2—N2—C6	118.97 (16)
C6—C1—H1A	120.5	O1—N2—C6	118.17 (16)
C1—C2—C3	121.91 (16)	Ag1—N3—H3D	109.5
C1—C2—H2A	119.0	Ag1—N3—H3C	109.5
C3—C2—H2A	119.0	H3D—N3—H3C	109.5
N1—C3—C2	119.65 (16)	Ag1—N3—H3B	109.5
N1—C3—C4	122.09 (16)	H3D—N3—H3B	109.5
C2—C3—C4	118.26 (15)	H3C—N3—H3B	109.5
C5—C4—C3	118.92 (15)	C7—O3—Ag2	101.61 (10)
C5—C4—C7	118.39 (14)	C7—O4—Ag2	82.57 (10)
C3—C4—C7	122.67 (14)

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

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1B···O3^v	0.88	2.09	2.9473 (18)	164
N1—H1C···O4	0.88	2.03	2.685 (2)	131
N3—H3D···O3^vi	0.91	2.37	3.185 (2)	149
N3—H3C···O4^ii	0.91	2.21	3.077 (2)	159
N3—H3B···O1	0.91	2.29	3.038 (2)	139

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