Poly[[di-μ3-nicotinato-μ3-oxalato-samarium(III)silver(I)] dihydrate]

Zhu, L.-C.; Zhao, Z.-G.; Yu, S.-J.

doi:10.1107/S1600536809032115

metal-organic compounds

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ISSN: 2056-9890

Volume 65| Part 9| September 2009| Page m1105

doi:10.1107/S1600536809032115

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ADDENDA AND ERRATA

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Poly[[di-μ₃-nicotinato-μ₃-oxalato-samarium(III)silver(I)] dihydrate]

Li-Cai Zhu,^a Zhen-Gang Zhao ^b and Shu-Juan Yu ^b ^*

^aSchool of Chemistry and Environment, South China Normal University, Guangzhou 510631, People's Republic of China, and ^bCollege of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510641, People's Republic of China
^*Correspondence e-mail: lfshjyu@scut.edu.cn

(Received 15 July 2009; accepted 13 August 2009; online 19 August 2009)

In the title three-dimensional heterometallic complex, {[AgSm(C₆H₄NO₂)₂(C₂O₄)]·2H₂O}_n, the Sm^III ion is eight-coordinated by four O atoms from four different nicotinate ligands and four O atoms from two different oxalate ligands. The three-coordinate Ag^I ion is bonded to two N atoms from two different nicotinate anions and one O atom from an oxalate anion. These metal coordination units are connected by bridging nicotinate and oxalate ligands, generating a three-dimensional network. The uncoordinated water molecules link the carboxylate groups via O—H⋯O hydrogen bonding. The crystal structure is further stabilized by hydrogen bonds between the water molecules.

Related literature

For theapplications of lanthanide–transition metal heterometallic complexes with bridging multifunctional organic ligands, see: Cheng et al. (2006 ); Kuang et al. (2007 ); Luo et al. (2007 ); Peng et al. (2008 ).

Experimental

Crystal data

[AgSm(C₆H₄NO₂)₂(C₂O₄)]·2H₂O
M_r = 626.49
Monoclinic, P 2₁ /c
a = 9.7145 (9) Å
b = 22.3444 (15) Å
c = 9.1726 (6) Å
β = 117.295 (1)°
V = 1769.4 (2) Å³
Z = 4
Mo Kα radiation
μ = 4.45 mm⁻¹
T = 296 K
0.23 × 0.20 × 0.19 mm

Data collection

Bruker APEXII area-detector diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 1996 ) T_min = 0.374, T_max = 0.429
8972 measured reflections
3171 independent reflections
2995 reflections with I > 2σ(I)
R_int = 0.027

Refinement

R[F² > 2σ(F²)] = 0.023
wR(F²) = 0.052
S = 1.12
3171 reflections
254 parameters
H-atom parameters constrained
Δρ_max = 0.84 e Å⁻³
Δρ_min = −0.65 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1W—H1W⋯O7ⁱ	0.86	2.10	2.960 (5)	175
O1W—H2W⋯O2W	0.86	2.06	2.892 (7)	161
O2W—H4W⋯O1Wⁱ	0.87	1.92	2.780 (7)	171
Symmetry code: (i) $[x, -y+{\script{3\over 2}}, z+{\script{1\over 2}}]$ .

Data collection: APEX2 (Bruker, 2004 ); cell refinement: SAINT (Bruker, 2004); 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); software used to prepare material for publication: SHELXL97.

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536809032115/pv2185sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536809032115/pv2185Isup2.hkl

checkCIF report

Comment top

In the past few years, lanthanide-transition metal heterometallic complexs with bridging multifunctionnal organic ligands have generated much interest, not only because of their impressive topological structures, but also due to their versatile applications in ion exchange, magnetism, bimetallic catalysis and luminescent probe (Cheng et al., 2006; Kuang et al., 2007; Luo et al., 2007; Peng et al., 2008). As an extension of this research, we report here the structure of the title compound, a new heterometallic coordination polymer.

In the title compound (Fig. 1), there are one Sm^III ion, one Ag^I ion, two halves of oxalate ligand, two nicotinate ligands, and two lattice water molecules in the asymmetric unit. Each Sm^III ion is eight-coordinated by four O atoms from four different nicotinate ligands, and four O atoms of two different oxalate ligands. The Sm center can be described as having a bicapped trigonal prism coordination geometry. The three-coordinate Ag^I ion is bonded to two N atoms from two different nicotinate anions and one O atom from an oxalate anion. Thus the Ag^I ion is in a T-shaped configuration. These metal coordination units are connected by bridging nicotinate and oxalate ligands, generating a three-dimensional network (Fig. 2). The uncoordinated water molecules link the carboxylate groups by O—H···O hydrogen bonding (Table 1). The crystal structure is further stabilized by hydrogen bonds.

Related literature top

For theapplications of lanthanide–transition metal heterometallic complexes with bridging multifunctional organic ligands, see: Cheng et al. (2006); Kuang et al. (2007); Luo et al. (2007); Peng et al. (2008).

Experimental top

A mixture of AgNO₃ (0.057 g, 0.33 mmol), Sm₂O₃ (0.116 g, 0.33 mmol), nicotinic acid (0.164 g, 1.33 mmol), oxalic acid (0.119 g, 1.33 mmol), H₂O (7 ml), and HClO₄ (0.257 mmol)(pH 2) was sealed in a 20 ml Teflon-lined reaction vessel at 443 K for 6 days then slowly cooled to room temperature. The product was collected by filtration, washed with water and air-dried. Colorless block crystals suitable for X-ray analysis were obtained.

Computing details top

Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top

	Fig. 1. The molecular structure showing the atomic-numbering scheme and displacement ellipsoids drawn at the 30% probability level. Symmetry codes included in the atomic labels: (A) 2-x, 2-y, 1-z; (B) 1-x, 2-y, -z; (C) 1+x, y, z; (D) x, 1.5-y, -0.5+z; (E) 2-x, 0.5+y, 0.5-z.
	Fig. 2. A view of the three-dimensional structure of the title compound; dotted lines denote hydrogen bonds.

Poly[[di-µ₃-nicotinato-µ₃-oxalato-samarium(III)silver(I)] dihydrate] top

Crystal data top

[AgSm(C₆H₄NO₂)₂(C₂O₄)]·2H₂O	F(000) = 1196
M_r = 626.49	D_x = 2.352 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 6346 reflections
a = 9.7145 (9) Å	θ = 2.4–27.8°
b = 22.3444 (15) Å	µ = 4.45 mm⁻¹
c = 9.1726 (6) Å	T = 296 K
β = 117.295 (1)°	Block, colorless
V = 1769.4 (2) Å³	0.23 × 0.20 × 0.19 mm
Z = 4

Data collection top

Bruker APEXII area-detector diffractometer	3171 independent reflections
Radiation source: fine-focus sealed tube	2995 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.027
ϕ and ω scans	θ_max = 25.2°, θ_min = 2.4°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −5→11
T_min = 0.374, T_max = 0.429	k = −26→26
8972 measured reflections	l = −10→10

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.023	H-atom parameters constrained
wR(F²) = 0.052	w = 1/[σ²(F_o²) + (0.0174P)² + 1.7329P] where P = (F_o² + 2F_c²)/3
S = 1.12	(Δ/σ)_max = 0.002
3171 reflections	Δρ_max = 0.84 e Å⁻³
254 parameters	Δρ_min = −0.65 e Å⁻³
0 restraints	Extinction correction: SHELXL97 (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.00351 (16)

Crystal data top

[AgSm(C₆H₄NO₂)₂(C₂O₄)]·2H₂O	V = 1769.4 (2) Å³
M_r = 626.49	Z = 4
Monoclinic, P2₁/c	Mo Kα radiation
a = 9.7145 (9) Å	µ = 4.45 mm⁻¹
b = 22.3444 (15) Å	T = 296 K
c = 9.1726 (6) Å	0.23 × 0.20 × 0.19 mm
β = 117.295 (1)°

Data collection top

Bruker APEXII area-detector diffractometer	3171 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	2995 reflections with I > 2σ(I)
T_min = 0.374, T_max = 0.429	R_int = 0.027
8972 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.023	0 restraints
wR(F²) = 0.052	H-atom parameters constrained
S = 1.12	Δρ_max = 0.84 e Å⁻³
3171 reflections	Δρ_min = −0.65 e Å⁻³
254 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
Sm1	0.85715 (2)	0.991315 (8)	0.11767 (2)	0.01683 (8)
Ag2	0.82067 (4)	0.852371 (14)	0.48309 (5)	0.04794 (12)
O1	0.8835 (3)	0.94402 (11)	0.3695 (3)	0.0275 (6)
N1	0.6254 (4)	0.88411 (15)	0.5163 (4)	0.0346 (8)
C4	0.3834 (4)	0.93617 (16)	0.4147 (4)	0.0231 (8)
C3	0.4789 (5)	0.88129 (19)	0.6648 (5)	0.0368 (10)
H3	0.4696	0.8681	0.7560	0.044*
C1	0.5154 (4)	0.91951 (17)	0.4047 (5)	0.0291 (9)
H1	0.5291	0.9334	0.3166	0.035*
C2	0.6042 (5)	0.86566 (19)	0.6441 (5)	0.0382 (10)
H2	0.6788	0.8410	0.7221	0.046*
C6	0.2586 (4)	0.97226 (16)	0.2811 (4)	0.0222 (8)
C5	0.3662 (5)	0.91690 (17)	0.5490 (4)	0.0293 (9)
H5	0.2795	0.9279	0.5608	0.035*
O3	0.2900 (3)	0.99674 (11)	0.1769 (3)	0.0284 (6)
O2	0.1309 (3)	0.97383 (13)	0.2834 (3)	0.0313 (6)
N2	0.9619 (4)	0.78296 (14)	0.4537 (4)	0.0332 (8)
C7	0.9364 (4)	0.72618 (16)	0.4792 (5)	0.0287 (8)
H7	0.8605	0.7184	0.5117	0.034*
C9	1.1309 (5)	0.6899 (2)	0.4136 (5)	0.0390 (10)
H9	1.1876	0.6589	0.3994	0.047*
C8	1.0722 (5)	0.79305 (19)	0.4069 (5)	0.0408 (10)
H8	1.0903	0.8322	0.3859	0.049*
O7	0.6156 (3)	0.93618 (11)	0.0496 (3)	0.0253 (6)
C10	1.0169 (4)	0.67816 (16)	0.4599 (4)	0.0239 (8)
C12	1.1588 (5)	0.7483 (2)	0.3889 (6)	0.0490 (12)
H12	1.2365	0.7573	0.3600	0.059*
C13	0.9793 (4)	0.96697 (16)	0.5028 (4)	0.0207 (7)
O8	1.0418 (3)	0.94114 (11)	0.6386 (3)	0.0255 (6)
O6	0.3580 (3)	0.94430 (11)	−0.0787 (3)	0.0280 (6)
O1W	0.6113 (6)	0.69616 (19)	0.5607 (5)	0.0925 (14)
H1W	0.6115	0.6576	0.5630	0.139*
H2W	0.5551	0.7081	0.6053	0.139*
O2W	0.4884 (7)	0.7331 (2)	0.7801 (6)	0.1179 (19)
H3W	0.4044	0.7508	0.7119	0.177*
H4W	0.5226	0.7525	0.8720	0.177*
C11	0.9771 (4)	0.61643 (15)	0.4922 (4)	0.0236 (8)
O4	0.8882 (3)	0.61157 (11)	0.5557 (3)	0.0322 (6)
O5	1.0350 (3)	0.57246 (12)	0.4552 (3)	0.0353 (7)
C14	0.4919 (4)	0.96531 (16)	−0.0083 (4)	0.0216 (8)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Sm1	0.01410 (11)	0.01776 (12)	0.01771 (11)	0.00069 (7)	0.00649 (8)	0.00163 (7)
Ag2	0.0358 (2)	0.02335 (18)	0.0903 (3)	0.00795 (13)	0.0338 (2)	0.00929 (16)
O1	0.0327 (16)	0.0290 (14)	0.0187 (12)	−0.0129 (12)	0.0100 (12)	−0.0031 (10)
N1	0.0243 (18)	0.0306 (19)	0.046 (2)	0.0061 (14)	0.0134 (16)	0.0060 (15)
C4	0.021 (2)	0.026 (2)	0.0181 (17)	−0.0007 (15)	0.0052 (15)	0.0010 (14)
C3	0.044 (3)	0.042 (3)	0.024 (2)	0.010 (2)	0.0148 (19)	0.0092 (17)
C1	0.023 (2)	0.032 (2)	0.032 (2)	0.0064 (16)	0.0126 (17)	0.0080 (17)
C2	0.032 (3)	0.037 (2)	0.034 (2)	0.0069 (19)	0.005 (2)	0.0100 (18)
C6	0.0167 (19)	0.0244 (19)	0.0190 (17)	0.0007 (15)	0.0027 (15)	−0.0008 (14)
C5	0.026 (2)	0.035 (2)	0.027 (2)	0.0038 (17)	0.0124 (17)	0.0024 (17)
O3	0.0231 (15)	0.0376 (16)	0.0205 (13)	0.0005 (11)	0.0066 (11)	0.0056 (11)
O2	0.0161 (14)	0.0495 (17)	0.0254 (14)	0.0082 (12)	0.0070 (11)	0.0042 (12)
N2	0.0314 (19)	0.0210 (17)	0.048 (2)	0.0001 (14)	0.0188 (16)	0.0057 (15)
C7	0.024 (2)	0.023 (2)	0.041 (2)	0.0007 (16)	0.0171 (18)	0.0021 (16)
C9	0.036 (3)	0.037 (3)	0.053 (3)	0.0067 (19)	0.029 (2)	0.005 (2)
C8	0.044 (3)	0.031 (2)	0.053 (3)	−0.0032 (19)	0.026 (2)	0.010 (2)
O7	0.0179 (14)	0.0232 (13)	0.0326 (14)	0.0020 (11)	0.0097 (11)	0.0017 (11)
C10	0.022 (2)	0.0234 (19)	0.0251 (18)	0.0017 (15)	0.0098 (16)	−0.0018 (15)
C12	0.041 (3)	0.051 (3)	0.071 (3)	−0.002 (2)	0.040 (3)	0.011 (2)
C13	0.0181 (19)	0.0234 (19)	0.0239 (19)	0.0007 (14)	0.0126 (16)	0.0006 (14)
O8	0.0291 (15)	0.0218 (13)	0.0221 (13)	0.0012 (11)	0.0088 (11)	0.0022 (10)
O6	0.0179 (14)	0.0271 (14)	0.0371 (15)	−0.0011 (11)	0.0109 (12)	−0.0066 (11)
O1W	0.120 (4)	0.060 (3)	0.108 (3)	0.008 (3)	0.062 (3)	−0.012 (2)
O2W	0.147 (5)	0.100 (4)	0.106 (4)	0.027 (4)	0.056 (4)	0.012 (3)
C11	0.024 (2)	0.0162 (18)	0.0233 (18)	0.0018 (14)	0.0045 (16)	−0.0033 (14)
O4	0.0308 (16)	0.0235 (14)	0.0488 (17)	−0.0014 (11)	0.0239 (14)	0.0039 (12)
O5	0.0417 (18)	0.0265 (15)	0.0296 (14)	0.0111 (12)	0.0092 (13)	−0.0050 (11)
C14	0.021 (2)	0.025 (2)	0.0208 (18)	−0.0003 (15)	0.0115 (16)	−0.0035 (14)

Geometric parameters (Å, º) top

Sm1—O5ⁱ	2.340 (3)	N2—C7	1.334 (5)
Sm1—O2ⁱⁱ	2.414 (2)	N2—C8	1.342 (5)
Sm1—O4ⁱⁱⁱ	2.420 (3)	C7—C10	1.386 (5)
Sm1—O3^iv	2.424 (2)	C7—H7	0.9300
Sm1—O6^iv	2.425 (2)	C9—C12	1.372 (6)
Sm1—O1	2.444 (2)	C9—C10	1.381 (5)
Sm1—O7	2.464 (2)	C9—H9	0.9300
Sm1—O8^v	2.496 (2)	C8—C12	1.366 (6)
Ag2—N2	2.168 (3)	C8—H8	0.9300
Ag2—N1	2.174 (3)	O7—C14	1.251 (4)
Ag2—O1	2.497 (2)	C10—C11	1.498 (5)
O1—C13	1.257 (4)	C12—H12	0.9300
N1—C2	1.344 (5)	C13—O8	1.249 (4)
N1—C1	1.346 (5)	C13—C13^v	1.537 (7)
C4—C1	1.378 (5)	O8—Sm1^v	2.496 (2)
C4—C5	1.385 (5)	O6—C14	1.249 (4)
C4—C6	1.504 (5)	O6—Sm1^iv	2.425 (2)
C3—C2	1.361 (6)	O1W—H1W	0.8624
C3—C5	1.376 (5)	O1W—H2W	0.8612
C3—H3	0.9300	O2W—H3W	0.8629
C1—H1	0.9300	O2W—H4W	0.8667
C2—H2	0.9300	C11—O4	1.249 (4)
C6—O2	1.251 (4)	C11—O5	1.253 (4)
C6—O3	1.254 (4)	O4—Sm1^vii	2.420 (3)
C5—H5	0.9300	O5—Sm1^viii	2.340 (3)
O3—Sm1^iv	2.424 (2)	C14—C14^iv	1.559 (7)
O2—Sm1^vi	2.414 (2)

O5ⁱ—Sm1—O2ⁱⁱ	78.29 (10)	N1—C2—C3	123.2 (4)
O5ⁱ—Sm1—O4ⁱⁱⁱ	123.28 (10)	N1—C2—H2	118.4
O2ⁱⁱ—Sm1—O4ⁱⁱⁱ	76.96 (9)	C3—C2—H2	118.4
O5ⁱ—Sm1—O3^iv	73.05 (9)	O2—C6—O3	126.2 (3)
O2ⁱⁱ—Sm1—O3^iv	129.50 (9)	O2—C6—C4	115.9 (3)
O4ⁱⁱⁱ—Sm1—O3^iv	85.19 (9)	O3—C6—C4	117.9 (3)
O5ⁱ—Sm1—O6^iv	88.09 (10)	C3—C5—C4	119.2 (4)
O2ⁱⁱ—Sm1—O6^iv	144.58 (9)	C3—C5—H5	120.4
O4ⁱⁱⁱ—Sm1—O6^iv	136.12 (9)	C4—C5—H5	120.4
O3^iv—Sm1—O6^iv	75.08 (9)	C6—O3—Sm1^iv	132.3 (2)
O5ⁱ—Sm1—O1	137.60 (8)	C6—O2—Sm1^vi	143.9 (2)
O2ⁱⁱ—Sm1—O1	74.16 (9)	C7—N2—C8	117.1 (4)
O4ⁱⁱⁱ—Sm1—O1	80.84 (9)	C7—N2—Ag2	118.6 (3)
O3^iv—Sm1—O1	148.63 (9)	C8—N2—Ag2	124.2 (3)
O6^iv—Sm1—O1	96.06 (9)	N2—C7—C10	123.6 (4)
O5ⁱ—Sm1—O7	144.52 (9)	N2—C7—H7	118.2
O2ⁱⁱ—Sm1—O7	136.44 (9)	C10—C7—H7	118.2
O4ⁱⁱⁱ—Sm1—O7	70.86 (9)	C12—C9—C10	118.5 (4)
O3^iv—Sm1—O7	76.49 (9)	C12—C9—H9	120.7
O6^iv—Sm1—O7	66.61 (8)	C10—C9—H9	120.7
O1—Sm1—O7	72.42 (8)	N2—C8—C12	122.8 (4)
O5ⁱ—Sm1—O8^v	75.15 (9)	N2—C8—H8	118.6
O2ⁱⁱ—Sm1—O8^v	70.51 (9)	C12—C8—H8	118.6
O4ⁱⁱⁱ—Sm1—O8^v	138.13 (9)	C14—O7—Sm1	117.7 (2)
O3^iv—Sm1—O8^v	136.13 (8)	C9—C10—C7	118.1 (4)
O6^iv—Sm1—O8^v	74.44 (8)	C9—C10—C11	123.5 (3)
O1—Sm1—O8^v	65.62 (8)	C7—C10—C11	118.4 (3)
O7—Sm1—O8^v	117.85 (8)	C8—C12—C9	119.8 (4)
N2—Ag2—N1	153.35 (12)	C8—C12—H12	120.1
N2—Ag2—O1	104.18 (11)	C9—C12—H12	120.1
N1—Ag2—O1	100.77 (11)	O8—C13—O1	125.9 (3)
C13—O1—Sm1	116.9 (2)	O8—C13—C13^v	117.5 (4)
C13—O1—Ag2	98.2 (2)	O1—C13—C13^v	116.6 (4)
Sm1—O1—Ag2	144.02 (10)	C13—O8—Sm1^v	115.2 (2)
C2—N1—C1	117.2 (4)	C14—O6—Sm1^iv	118.5 (2)
C2—N1—Ag2	120.9 (3)	H1W—O1W—H2W	106.9
C1—N1—Ag2	121.7 (3)	H3W—O2W—H4W	106.8
C1—C4—C5	118.1 (3)	O4—C11—O5	123.4 (3)
C1—C4—C6	121.2 (3)	O4—C11—C10	118.0 (3)
C5—C4—C6	120.7 (3)	O5—C11—C10	118.7 (3)
C2—C3—C5	119.1 (4)	C11—O4—Sm1^vii	112.3 (2)
C2—C3—H3	120.5	C11—O5—Sm1^viii	179.0 (3)
C5—C3—H3	120.5	O6—C14—O7	126.5 (3)
N1—C1—C4	123.1 (4)	O6—C14—C14^iv	117.3 (4)
N1—C1—H1	118.4	O7—C14—C14^iv	116.2 (4)
C4—C1—H1	118.4

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1W···O7^vii	0.86	2.10	2.960 (5)	175
O1W—H2W···O2W	0.86	2.06	2.892 (7)	161
O2W—H4W···O1W^vii	0.87	1.92	2.780 (7)	171

Symmetry code: (vii) x, −y+3/2, z+1/2.

Experimental details

Crystal data
Chemical formula	[AgSm(C₆H₄NO₂)₂(C₂O₄)]·2H₂O
M_r	626.49
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	296
a, b, c (Å)	9.7145 (9), 22.3444 (15), 9.1726 (6)
β (°)	117.295 (1)
V (Å³)	1769.4 (2)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	4.45
Crystal size (mm)	0.23 × 0.20 × 0.19

Data collection
Diffractometer	Bruker APEXII area-detector diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 1996)
T_min, T_max	0.374, 0.429
No. of measured, independent and observed [I > 2σ(I)] reflections	8972, 3171, 2995
R_int	0.027
(sin θ/λ)_max (Å⁻¹)	0.598

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.023, 0.052, 1.12
No. of reflections	3171
No. of parameters	254
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.84, −0.65

Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1W···O7ⁱ	0.86	2.10	2.960 (5)	175
O1W—H2W···O2W	0.86	2.06	2.892 (7)	161
O2W—H4W···O1Wⁱ	0.87	1.92	2.780 (7)	171

Symmetry code: (i) x, −y+3/2, z+1/2.

Acknowledgements

The authors acknowledge South China Normal University for supporting this work.

References

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