Bis[μ-3-(1H-pyrazol-1-yl)benzonitrile-κ2N:N′]bis­[perchloratosilver(I)]

Niu, C.-Y.; Zhang, H.-Y.; Feng, C.-L.; Wan, X.-S.; Kou, C.-H.

doi:10.1107/S1600536808030602

metal-organic compounds

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ISSN: 2056-9890

Volume 64| Part 10| October 2008| Pages m1332-m1333

doi:10.1107/S1600536808030602

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Bis[μ-3-(1H-pyrazol-1-yl)benzonitrile-κ²N:N′]bis[perchloratosilver(I)]

Cao-Yuan Niu,^a ^* Hai-Yan Zhang,^a Cao-Ling Feng,^a Xin-Sheng Wan ^a and Chun-Hong Kou ^a

^aCollege of Sciences, Henan Agricultural University, Zhengzhou 450002, People's Republic of China
^*Correspondence e-mail: niu_cy2000@yahoo.com.cn

(Received 31 July 2008; accepted 23 September 2008; online 27 September 2008)

In the title centrosymmetric complex, [Ag₂(ClO₄)₂(C₁₀H₇N₃)₂], the unique Ag^I ion is coordinated by an N atom from a carbonitrile group, an N atom from a symmetry-related pyrazole group and an O atom of a perchlorate ligand to form a distorted T-shaped environment. Two 3-(1H-pyrazol-1-yl)benzonitrile ligands each bridge two Ag^I ions to form a dinuclear complex. In the crystal structure, there are weak Ag⋯O interactions within the range 2.70–3.01 Å linking dimeric units into layers approximately parallel to (100). The O atoms of the perchlorate ligand are disordered over two sites with occupancies of 0.570 (11) and 0.430 (11), respectively.

Related literature

For background information, see: Antonioli et al. (2006 ); Bourlier et al. (2007 ); Niu et al. (2007 ); Sumby & Hardie (2005 ).

Experimental

Crystal data

[Ag₂(ClO₄)₂(C₁₀H₇N₃)₂]
M_r = 753.02
Monoclinic, P 2₁ /n
a = 7.8522 (13) Å
b = 10.6086 (17) Å
c = 15.322 (2) Å
β = 101.100 (2)°
V = 1252.5 (3) Å³
Z = 2
Mo Kα radiation
μ = 1.83 mm⁻¹
T = 173 (2) K
0.51 × 0.47 × 0.36 mm

Data collection

Siemens SMART CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.455, T_max = 0.558 (expected range = 0.421–0.517)
7721 measured reflections
2833 independent reflections
2180 reflections with I > 2σ(I)
R_int = 0.021

Refinement

R[F² > 2σ(F²)] = 0.042
wR(F²) = 0.114
S = 0.96
2833 reflections
209 parameters
74 restraints
H-atom parameters constrained
Δρ_max = 0.75 e Å⁻³
Δρ_min = −0.59 e Å⁻³

Table 1
Selected geometric parameters (Å, °)

Ag1—N3ⁱ	2.154 (6)
Ag1—N1	2.198 (4)
Ag1—O4	2.495 (6)
Ag1—O4′ⁱⁱ	2.609 (6)

N3ⁱ—Ag1—N1	147.16 (17)
N3ⁱ—Ag1—O4	105.89 (19)
N1—Ag1—O4	89.96 (19)
N1—Ag1—O4′ⁱⁱ	98.4 (19)
N3ⁱ—Ag1—O4′ⁱⁱ	110.8 (19)
Symmetry codes: (i) -x+1, -y+1, -z+2; (ii) $[-x+{\script{3\over 2}}, y-{\script{1\over 2}}, -z+{\script{3\over 2}}]$ .

Data collection: SMART (Siemens, 1996 ); cell refinement: SAINT (Siemens, 1994 ); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2003 ); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536808030602/lh2676sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536808030602/lh2676Isup2.hkl

checkCIF report

Comment top

Silver coordination polymers have been widely studied not only for their utility in special functional materials, but also for their fascinating structures derived from variable coordination numbers from 2 to 6 of silver atoms and different conformations around silver metal centres (Sumby & Hardie, 2005; Niu et al., 2007). Nitrogen heterocycle organic compounds with multiple pyridyl, or pyrazole, or carbonitrile nitrogen atoms are good bridging organic ligands in coordination interactions with silver atoms (Antonioli et al., 2006; Bourlier et al., 2007). Herein we communicate the crystal structure of one silver coordination dimer with one asymmetric organic bridging ligand, 3-(1H-pyrazol-1-yl)benzonitrile, with carbonitrile and pyrazole coordinating groups.

In the title compound, (I), the central silver ion is coordinated by two nitrogen atoms [N1, N3ⁱ; Symmetry codes: (i) -x + 1, -y + 1, -z + 2] of carbonitrile and pyrazole groups from two different 3-(1H-pyrazol-1-yl)benzonitrile molecule and one oxygen atom [O4] from one perchlorate anion, forming the primary distorted T-shape coordination environment around the silver atom (Fig .1). The O atoms of the perchlorate ligand are disodered over two sites with maximum and minimum occupancies of 0.57 and 0.43. While an O atom of the major component coordinates to the unique Ag^I ion, an O atom of the minor component coordinates to a symmetry related Ag^I ion. The overall effect of the disorder is that two different slightly distorted T-shaped coordination enviroments are formed with the two Ag—O disorder components being approximately orthogonal to each other (Fig. 3).

In (I), the 3-(1H-pyrazol-1-yl)benzonitrile molecule ligand acts as a µ₂-bridging ligand. Two ligands each bridge two metal centres through one carbonitrile nitrogen atom and one pyrazole nitrogen atom to form a small centrosymmetric 2+2 Ag₂L₂ (L = ligand) ring as a constructing unit (Fig. 1). The Ag···Ag separation in one ring is about 6.852 (5) Å. There are weak Ag···O interactions between Ag1 and O1 and Ag1 and O3 with the separations of about 2.89 and 3.01 Å, respectively [Ag1···O1' = 2.70 Å]. Supramolecular two-dimensional layers are constructed through the strong Ag—O bonds and weak Ag···O interactions between perchlorate anions and silver atoms of dinuclear rings (Fig. 2). The layers lie approximately parallel to the bc plane.

Related literature top

For background information, see: Antonioli et al. (2006); Bourlier et al. (2007); Niu et al. (2007); Sumby & Hardie (2005).

Experimental top

A solution of AgClO₄.H₂O (0.023 g, 0.1 mmol) in methanol (10 ml) was carefully layered on a methanol/chloroform solution (5 ml/10 ml) of 3-(1H-pyrazol-1-yl)benzonitrile (0.017 g, 0.1 mmol) in a straight glass tube. About one week later, colourless single crystals of (I) suitable for X-ray analysis were obtained (yield 39%).

Computing details top

Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1994); data reduction: SAINT (Siemens, 1994); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2003); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

	Fig. 1. A view of the Ag^I coordination environment in the dimeric structure of (I), showing the atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level and H atoms are shown as small spheres of arbitrary radii. [Symmetry codes: (i) -x + 1, -y + 1, -z + 2] The minor component of disorder is shown with open bonds.
	Fig. 2. Part of the crystal structure of (I). Dashed lines show weak Ag···O interactions. The minor component of disorder is not shown.
	Fig. 3. Part of the crystal structure showing the major and minor (dashed bonds) components of disorder.

Bis[µ-3-(1H-pyrazol-1-yl)benzonitrile- κ²N:N']bis[perchloratosilver(I)] top

Crystal data top

[Ag₂(ClO₄)₂(C₁₀H₇N₃)₂]	F(000) = 736
M_r = 753.02	D_x = 1.997 Mg m⁻³
Monoclinic, P2₁/n	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yn	Cell parameters from 3269 reflections
a = 7.8522 (13) Å	θ = 2.7–27.5°
b = 10.6086 (17) Å	µ = 1.84 mm⁻¹
c = 15.322 (2) Å	T = 173 K
β = 101.100 (2)°	Prism, colourless
V = 1252.5 (3) Å³	0.51 × 0.47 × 0.36 mm
Z = 2

Data collection top

Siemens SMART CCD diffractometer	2833 independent reflections
Radiation source: fine-focus sealed tube	2180 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.021
ϕ and ω scans	θ_max = 27.5°, θ_min = 2.7°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −10→10
T_min = 0.455, T_max = 0.558	k = −13→9
7721 measured reflections	l = −17→19

Refinement top

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)] = 0.042	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.114	H-atom parameters constrained
S = 0.96	w = 1/[σ²(F_o²) + (0.0532P)² + 1.7339P] where P = (F_o² + 2F_c²)/3
2833 reflections	(Δ/σ)_max < 0.001
209 parameters	Δρ_max = 0.75 e Å⁻³
74 restraints	Δρ_min = −0.59 e Å⁻³

Crystal data top

[Ag₂(ClO₄)₂(C₁₀H₇N₃)₂]	V = 1252.5 (3) Å³
M_r = 753.02	Z = 2
Monoclinic, P2₁/n	Mo Kα radiation
a = 7.8522 (13) Å	µ = 1.84 mm⁻¹
b = 10.6086 (17) Å	T = 173 K
c = 15.322 (2) Å	0.51 × 0.47 × 0.36 mm
β = 101.100 (2)°

Data collection top

Siemens SMART CCD diffractometer	2833 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	2180 reflections with I > 2σ(I)
T_min = 0.455, T_max = 0.558	R_int = 0.021
7721 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.042	74 restraints
wR(F²) = 0.114	H-atom parameters constrained
S = 0.96	Δρ_max = 0.75 e Å⁻³
2833 reflections	Δρ_min = −0.59 e Å⁻³
209 parameters

Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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 > σ(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 (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Ag1	0.76740 (6)	0.39146 (4)	0.86430 (3)	0.07794 (19)
N1	1.0182 (5)	0.3203 (4)	0.9364 (2)	0.0701 (10)
N2	1.0408 (5)	0.2463 (4)	1.0104 (2)	0.0651 (9)
N3	0.4622 (7)	0.5000 (5)	1.1304 (3)	0.0911 (14)
Cl1	0.84901 (17)	0.60883 (10)	0.70970 (7)	0.0661 (3)
O1	0.7551 (17)	0.6867 (11)	0.7615 (9)	0.135 (6)	0.570 (11)
O2	0.7442 (18)	0.5787 (12)	0.6285 (7)	0.202 (8)	0.570 (11)
O3	0.9945 (14)	0.6862 (10)	0.6941 (9)	0.176 (6)	0.570 (11)
O4	0.9186 (10)	0.5048 (6)	0.7585 (5)	0.086 (3)	0.570 (11)
O1'	0.720 (2)	0.5094 (13)	0.7054 (9)	0.183 (8)	0.430 (11)
O2'	0.8668 (17)	0.6337 (11)	0.6228 (5)	0.107 (5)	0.430 (11)
O3'	1.0098 (17)	0.5589 (15)	0.7614 (8)	0.179 (9)	0.430 (11)
O4'	0.7999 (18)	0.7139 (10)	0.7552 (7)	0.085 (4)	0.430 (11)
C1	1.1968 (7)	0.1905 (5)	1.0250 (3)	0.0783 (13)
H1	1.2412	0.1350	1.0726	0.094*
C2	1.2802 (7)	0.2279 (6)	0.9589 (4)	0.0815 (14)
H2	1.3928	0.2041	0.9510	0.098*
C3	1.1662 (7)	0.3073 (5)	0.9066 (3)	0.0782 (14)
H3	1.1897	0.3484	0.8551	0.094*
C4	0.9047 (6)	0.2323 (4)	1.0594 (3)	0.0628 (11)
C5	0.8791 (8)	0.1159 (5)	1.0957 (3)	0.0760 (13)
H5	0.9520	0.0468	1.0885	0.091*
C6	0.7462 (8)	0.1014 (5)	1.1426 (4)	0.0865 (17)
H6	0.7288	0.0219	1.1681	0.104*
C7	0.6402 (8)	0.2000 (6)	1.1527 (3)	0.0802 (15)
H7	0.5488	0.1893	1.1846	0.096*
C8	0.6672 (7)	0.3159 (5)	1.1158 (3)	0.0674 (11)
C9	0.8030 (6)	0.3330 (4)	1.0700 (3)	0.0626 (10)
H9	0.8240	0.4133	1.0468	0.075*
C10	0.5544 (8)	0.4191 (6)	1.1244 (3)	0.0762 (14)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Ag1	0.0955 (3)	0.0756 (3)	0.0665 (3)	−0.0075 (2)	0.0251 (2)	0.00463 (17)
N1	0.086 (3)	0.074 (2)	0.0521 (19)	−0.016 (2)	0.0166 (18)	0.0037 (17)
N2	0.083 (3)	0.063 (2)	0.0512 (19)	−0.0112 (19)	0.0176 (18)	−0.0030 (16)
N3	0.103 (4)	0.095 (3)	0.084 (3)	−0.004 (3)	0.039 (3)	0.000 (3)
Cl1	0.0891 (8)	0.0551 (6)	0.0545 (6)	−0.0027 (5)	0.0151 (5)	0.0009 (4)
O1	0.158 (10)	0.110 (9)	0.157 (10)	0.023 (7)	0.079 (8)	0.002 (7)
O2	0.254 (15)	0.164 (11)	0.138 (11)	0.034 (10)	−0.087 (11)	−0.050 (9)
O3	0.217 (12)	0.148 (9)	0.187 (12)	−0.070 (8)	0.100 (10)	0.013 (8)
O4	0.096 (4)	0.076 (4)	0.096 (4)	0.022 (3)	0.042 (3)	0.038 (3)
O1'	0.246 (15)	0.191 (13)	0.128 (11)	−0.158 (12)	0.079 (10)	−0.058 (9)
O2'	0.145 (10)	0.127 (9)	0.063 (6)	0.017 (7)	0.052 (7)	0.033 (6)
O3'	0.164 (13)	0.198 (15)	0.135 (11)	0.075 (11)	−0.069 (10)	−0.072 (10)
O4'	0.125 (9)	0.069 (6)	0.058 (5)	0.016 (6)	0.007 (5)	−0.009 (4)
C1	0.091 (4)	0.077 (3)	0.067 (3)	0.000 (3)	0.016 (3)	0.002 (2)
C2	0.082 (3)	0.092 (4)	0.075 (3)	−0.010 (3)	0.026 (3)	−0.016 (3)
C3	0.094 (4)	0.087 (3)	0.059 (3)	−0.025 (3)	0.028 (3)	−0.008 (2)
C4	0.080 (3)	0.063 (3)	0.045 (2)	−0.016 (2)	0.0128 (19)	−0.0027 (18)
C5	0.101 (4)	0.066 (3)	0.061 (3)	−0.011 (3)	0.016 (3)	0.005 (2)
C6	0.115 (5)	0.075 (4)	0.071 (3)	−0.025 (3)	0.021 (3)	0.019 (3)
C7	0.093 (4)	0.091 (4)	0.058 (3)	−0.024 (3)	0.021 (2)	0.011 (2)
C8	0.078 (3)	0.076 (3)	0.048 (2)	−0.014 (2)	0.014 (2)	0.000 (2)
C9	0.084 (3)	0.058 (2)	0.047 (2)	−0.015 (2)	0.016 (2)	0.0004 (18)
C10	0.087 (3)	0.088 (4)	0.058 (3)	−0.016 (3)	0.025 (2)	0.001 (2)

Geometric parameters (Å, º) top

Ag1—N3ⁱ	2.154 (6)	Cl1—O3	1.463 (7)
Ag1—N1	2.198 (4)	C1—C2	1.367 (7)
Ag1—O4	2.495 (6)	C1—H1	0.9500
Ag1—O4'ⁱⁱ	2.609 (6)	C2—C3	1.370 (8)
N1—C3	1.335 (7)	C2—H2	0.9500
N1—N2	1.362 (5)	C3—H3	0.9500
N2—C1	1.340 (7)	C4—C9	1.362 (7)
N2—C4	1.428 (6)	C4—C5	1.384 (6)
N3—C10	1.137 (7)	C5—C6	1.385 (8)
N3—Ag1ⁱ	2.154 (6)	C5—H5	0.9500
Cl1—O4	1.385 (5)	C6—C7	1.364 (8)
Cl1—O2	1.390 (6)	C6—H6	0.9500
Cl1—O2'	1.391 (6)	C7—C8	1.387 (7)
Cl1—O4'	1.407 (7)	C7—H7	0.9500
Cl1—O1	1.442 (7)	C8—C9	1.396 (6)
Cl1—O1'	1.453 (7)	C8—C10	1.430 (8)
Cl1—O3'	1.455 (7)	C9—H9	0.9500

N3ⁱ—Ag1—N1	147.16 (17)	O4'—Cl1—O3	86.2 (8)
N3ⁱ—Ag1—O4	105.89 (19)	O1—Cl1—O3	105.4 (6)
N1—Ag1—O4	89.96 (19)	O1'—Cl1—O3	163.3 (7)
N1—Ag1—O4'ⁱⁱ	98.4 (19)	O3'—Cl1—O3	70.7 (9)
N3ⁱ—Ag1—O4'ⁱⁱ	110.8 (19)	Cl1—O4—Ag1	123.1 (4)
C3—N1—N2	104.1 (4)	N2—C1—C2	107.5 (5)
C3—N1—Ag1	128.2 (3)	N2—C1—H1	126.2
N2—N1—Ag1	125.2 (3)	C2—C1—H1	126.2
C1—N2—N1	111.2 (4)	C1—C2—C3	105.1 (5)
C1—N2—C4	128.2 (4)	C1—C2—H2	127.5
N1—N2—C4	120.5 (4)	C3—C2—H2	127.5
C10—N3—Ag1ⁱ	163.0 (5)	N1—C3—C2	112.1 (5)
O4—Cl1—O2	113.8 (6)	N1—C3—H3	123.9
O4—Cl1—O2'	124.4 (6)	C2—C3—H3	123.9
O2—Cl1—O2'	48.6 (6)	C9—C4—C5	121.2 (4)
O4—Cl1—O4'	118.8 (6)	C9—C4—N2	119.8 (4)
O2—Cl1—O4'	117.0 (8)	C5—C4—N2	119.0 (5)
O2'—Cl1—O4'	114.3 (6)	C4—C5—C6	119.3 (5)
O4—Cl1—O1	110.5 (6)	C4—C5—H5	120.3
O2—Cl1—O1	110.3 (7)	C6—C5—H5	120.3
O2'—Cl1—O1	125.1 (8)	C7—C6—C5	120.7 (5)
O4—Cl1—O1'	69.2 (7)	C7—C6—H6	119.6
O2—Cl1—O1'	60.4 (7)	C5—C6—H6	119.6
O2'—Cl1—O1'	106.9 (6)	C6—C7—C8	119.3 (5)
O4'—Cl1—O1'	110.1 (7)	C6—C7—H7	120.4
O1—Cl1—O1'	90.9 (9)	C8—C7—H7	120.4
O2—Cl1—O3'	134.9 (8)	C7—C8—C9	120.8 (5)
O2'—Cl1—O3'	110.7 (7)	C7—C8—C10	119.7 (5)
O4'—Cl1—O3'	108.1 (6)	C9—C8—C10	119.5 (4)
O1—Cl1—O3'	113.0 (8)	C4—C9—C8	118.7 (4)
O1'—Cl1—O3'	106.5 (7)	C4—C9—H9	120.7
O4—Cl1—O3	107.2 (6)	C8—C9—H9	120.7
O2—Cl1—O3	109.2 (7)	N3—C10—C8	178.7 (6)
O2'—Cl1—O3	60.8 (6)

N3ⁱ—Ag1—N1—C3	−142.6 (4)	N2—C1—C2—C3	0.2 (6)
O4—Ag1—N1—C3	−22.4 (5)	N2—N1—C3—C2	0.2 (6)
N3ⁱ—Ag1—N1—N2	58.4 (5)	Ag1—N1—C3—C2	−162.3 (4)
O4—Ag1—N1—N2	178.6 (4)	C1—C2—C3—N1	−0.2 (6)
C3—N1—N2—C1	0.0 (5)	C1—N2—C4—C9	144.8 (5)
Ag1—N1—N2—C1	163.1 (3)	N1—N2—C4—C9	−38.0 (6)
C3—N1—N2—C4	−177.7 (4)	C1—N2—C4—C5	−34.9 (7)
Ag1—N1—N2—C4	−14.5 (5)	N1—N2—C4—C5	142.3 (4)
O2—Cl1—O4—Ag1	−88.2 (10)	C9—C4—C5—C6	0.9 (7)
O2'—Cl1—O4—Ag1	−143.1 (8)	N2—C4—C5—C6	−179.4 (5)
O4'—Cl1—O4—Ag1	55.7 (10)	C4—C5—C6—C7	0.5 (8)
O1—Cl1—O4—Ag1	36.5 (9)	C5—C6—C7—C8	−0.4 (8)
O1'—Cl1—O4—Ag1	−46.4 (7)	C6—C7—C8—C9	−1.1 (8)
O3'—Cl1—O4—Ag1	138.0 (15)	C6—C7—C8—C10	178.7 (5)
O3—Cl1—O4—Ag1	150.9 (7)	C5—C4—C9—C8	−2.3 (7)
N3ⁱ—Ag1—O4—Cl1	−5.6 (7)	N2—C4—C9—C8	177.9 (4)
N1—Ag1—O4—Cl1	−156.5 (6)	C7—C8—C9—C4	2.4 (7)
N1—N2—C1—C2	−0.2 (6)	C10—C8—C9—C4	−177.4 (4)
C4—N2—C1—C2	177.3 (4)

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

Experimental details

Crystal data
Chemical formula	[Ag₂(ClO₄)₂(C₁₀H₇N₃)₂]
M_r	753.02
Crystal system, space group	Monoclinic, P2₁/n
Temperature (K)	173
a, b, c (Å)	7.8522 (13), 10.6086 (17), 15.322 (2)
β (°)	101.100 (2)
V (Å³)	1252.5 (3)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	1.84
Crystal size (mm)	0.51 × 0.47 × 0.36

Data collection
Diffractometer	Siemens SMART CCD diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.455, 0.558
No. of measured, independent and observed [I > 2σ(I)] reflections	7721, 2833, 2180
R_int	0.021
(sin θ/λ)_max (Å⁻¹)	0.650

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.042, 0.114, 0.96
No. of reflections	2833
No. of parameters	209
No. of restraints	74
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.75, −0.59

Computer programs: SMART (Siemens, 1996), SAINT (Siemens, 1994), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2003), SHELXTL (Sheldrick, 2008).

Selected geometric parameters (Å, º) top

Ag1—N3ⁱ	2.154 (6)	Ag1—O4	2.495 (6)
Ag1—N1	2.198 (4)	Ag1—O4'ⁱⁱ	2.609 (6)

N3ⁱ—Ag1—N1	147.16 (17)	N1—Ag1—O4'ⁱⁱ	98.4 (19)
N3ⁱ—Ag1—O4	105.89 (19)	N3ⁱ—Ag1—O4'ⁱⁱ	110.8 (19)
N1—Ag1—O4	89.96 (19)

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

Acknowledgements

We are grateful to Mrs Li (Wuhan University) for her assistance with the X-ray crystallographic analysis. We also gratefully acknowledge financial support from the Natural Science Foundation of Henan Province (grant No. 2008B150008) and the Science and Technology Key Task of Henan Province (grant No. 0624040011).

References

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