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Acta Cryst. (2009). E65, m1452    [ doi:10.1107/S1600536809043566 ]

catena-Poly[[[[3-(2-pyridyl)-1H-pyrazole]cadmium(II)]-[mu]-oxalato] dihydrate]

L. Zhu and Z. An

Abstract top

In the title compound, {[Cd(C2O4)(C8H7N3)]·2H2O}n, the CdII ion is chelated by two O,O'-bidentate oxalate ions and an N,N'-bidentate 3-(2-pyridyl)-1H-pyrazole molecule, thereby generating a distorted cis-CdN2O4 octahedral geometry. Adjacent pairs of Cd ions are bridged by oxalate ions, resulting in wave-like polymeric chains propagating in [100]. The packing is consolidated by N-H-O and O-H-O hydrogen bonds.

Comment top

Tridentate ligand 3-(2-pyridyl)pyrazole and its derivatives have been used widely in the construction of supramolecular architectures by way of metal-organic coordination (Ward et al. 1998; 2001).

As a continuation of these studies, we now report the crystal structure of the title complex.

As shown in figure 1, the CdII ions are hexcoordianted, chelated by two oxalate and one 3-(2-pyridyl)pyrazole ligand (Table 1). While each oxalate ligand acts as one bridige to chalate two Cd ions, forming one wave-like line with Cd···Cd distance being 5.950 /%A, shown in Figure 2. The structure is consolidated by N—H···O and O—H···O hydrogen bonds (Table 2, Figure 3).

Related literature top

For coordination compounds with pyridyl-pyrazolide ligands, see: Ward et al. (1998, 2001).

Experimental top

A mixture of Cd(CH3COO)2.2H2O (1 mmol, 0.027 g), oxalic acid (1 mmol, 0.09 g), sodium hydroxide (0.04 g, 1 mmol) and 3-(2-pyridyl)pyrazole (1 mmol, 0.15 g) and water (12 ml) was stirred for 30 min in air. The mixture was then transferred to a 25 ml Teflon-lined hydrothermal bomb. The bomb was kept at 433 K for 72 h under autogenous pressure. Upon cooling, colorless prisms of (I) were obtained from the reaction mixture.

Refinement top

All hydrogen atoms bound to carbon were refined using a riding model with C—H = 0.93 and Uiso(H) = 1.2Ueq(C). Two solvent water molecules are refined by using the 'DFIX' command with the hydrogen atoms were separated with 1.38 Å, and the lengths of bond H—O were constrained with 0.82 Å with error 0.02Å and Uiso = 1.5Ueq (O).

Computing details top

Data collection: SMART (Bruker, 20033); cell refinement: SAINT-Plus (Bruker, 2003); data reduction: SAINT-Plus (Bruker, 2003); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. , A view of the title compound with the unique atom-labelling scheme. Displacement ellipsoids are drawn at the 30% probability level. Atoms labeled with A are at the symmetry position (-x,-y + 2,-z + 2).
[Figure 2] Fig. 2. , A view of the chain strcuture of (I).
[Figure 3] Fig. 3. , A view of the packing strcuture of (I).
catena-Poly[[[[3-(2-pyridyl)-1H-pyrazole]cadmium(II)]-µ-oxalato] dihydrate] top
Crystal data top
[Cd(C2O4)(C8H7N3)]·2H2OZ = 2
Mr = 381.63F(000) = 376
Triclinic, P1Dx = 1.902 Mg m−3
Hall symbol: -P 1Mo Kα radiation, λ = 0.71073 Å
a = 7.920 (2) ÅCell parameters from 3167 reflections
b = 9.663 (2) Åθ = 2.9–28.3°
c = 9.675 (2) ŵ = 1.67 mm−1
α = 92.940 (4)°T = 293 K
β = 108.555 (3)°Block, colorless
γ = 106.164 (4)°0.12 × 0.10 × 0.08 mm
V = 666.2 (3) Å3
Data collection top
Bruker SMART CCD
diffractometer		2346 independent reflections
Radiation source: fine-focus sealed tube2247 reflections with I > 2σ(I)
graphiteRint = 0.008
ω scansθmax = 25.0°, θmin = 2.3°
Absorption correction: multi-scan
(SADABS; Bruker, 2003)		h = −8→9
Tmin = 0.825, Tmax = 0.878k = −11→9
3416 measured reflectionsl = −11→10
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.018Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.050H atoms treated by a mixture of independent and constrained refinement
S = 1.00 w = 1/[σ2(Fo2) + (0.031P)2 + 0.429P]
where P = (Fo2 + 2Fc2)/3
2346 reflections(Δ/σ)max = 0.001
193 parametersΔρmax = 0.38 e Å−3
6 restraintsΔρmin = −0.30 e Å−3
Crystal data top
[Cd(C2O4)(C8H7N3)]·2H2Oγ = 106.164 (4)°
Mr = 381.63V = 666.2 (3) Å3
Triclinic, P1Z = 2
a = 7.920 (2) ÅMo Kα radiation
b = 9.663 (2) ŵ = 1.67 mm−1
c = 9.675 (2) ÅT = 293 K
α = 92.940 (4)°0.12 × 0.10 × 0.08 mm
β = 108.555 (3)°
Data collection top
Bruker SMART CCD
diffractometer		2346 independent reflections
Absorption correction: multi-scan
(SADABS; Bruker, 2003)		2247 reflections with I > 2σ(I)
Tmin = 0.825, Tmax = 0.878Rint = 0.008
3416 measured reflectionsθmax = 25.0°
Refinement top
R[F2 > 2σ(F2)] = 0.018H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.050Δρmax = 0.38 e Å−3
S = 1.00Δρmin = −0.30 e Å−3
2346 reflectionsAbsolute structure: ?
193 parametersFlack parameter: ?
6 restraintsRogers parameter: ?
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
xyzUiso*/Ueq
Cd10.49223 (2)0.741369 (17)0.821503 (17)0.03309 (8)
C10.1758 (4)0.4289 (3)0.6244 (3)0.0458 (6)
H10.16050.41200.71410.055*
C20.0730 (4)0.3235 (3)0.5038 (4)0.0543 (7)
H2−0.00850.23660.51200.065*
C30.0924 (4)0.3483 (3)0.3708 (3)0.0531 (7)
H30.02320.27910.28690.064*
C40.2164 (4)0.4777 (3)0.3633 (3)0.0462 (6)
H40.23170.49670.27410.055*
C50.3179 (3)0.5791 (3)0.4901 (3)0.0339 (5)
C70.4569 (3)0.7167 (3)0.4902 (3)0.0342 (5)
C80.4998 (4)0.7780 (3)0.3728 (3)0.0475 (6)
H80.44190.74140.27270.057*
C90.4002 (3)0.9947 (2)0.9452 (2)0.0311 (5)
C110.4082 (3)0.5038 (2)1.0129 (2)0.0295 (5)
C200.6454 (4)0.9036 (3)0.4371 (3)0.0496 (7)
H200.70650.96930.38840.060*
N10.2973 (3)0.5554 (2)0.6200 (2)0.0365 (4)
N20.5697 (3)0.8005 (2)0.6184 (2)0.0351 (4)
N30.6837 (3)0.9143 (2)0.5838 (2)0.0421 (5)
H3A0.77010.98470.64740.050*
O10.3288 (2)0.89932 (18)0.83387 (18)0.0377 (4)
O20.3257 (2)1.0843 (2)0.9777 (2)0.0450 (4)
O30.3446 (2)0.60271 (19)0.9645 (2)0.0409 (4)
O40.3377 (2)0.41014 (18)1.07962 (18)0.0364 (4)
O5−0.0175 (3)0.1137 (3)0.7858 (3)0.0753 (7)
H1W−0.063 (4)0.067 (5)0.841 (4)0.113*
H2W0.0949 (15)0.126 (5)0.805 (4)0.113*
O60.0648 (3)0.6774 (3)0.0467 (3)0.0863 (9)
H3W−0.016 (4)0.703 (5)−0.013 (4)0.130*
H4W0.143 (5)0.660 (5)0.015 (4)0.130*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cd10.04230 (12)0.02946 (11)0.02728 (11)0.01333 (8)0.01047 (8)0.00063 (7)
C10.0421 (14)0.0385 (14)0.0520 (16)0.0092 (11)0.0127 (12)0.0075 (12)
C20.0399 (14)0.0388 (14)0.071 (2)0.0056 (11)0.0093 (14)−0.0040 (13)
C30.0412 (15)0.0483 (16)0.0574 (17)0.0102 (12)0.0071 (13)−0.0147 (13)
C40.0400 (14)0.0520 (16)0.0393 (14)0.0122 (12)0.0092 (11)−0.0124 (12)
C50.0319 (12)0.0368 (12)0.0333 (12)0.0144 (10)0.0095 (9)−0.0023 (10)
C70.0338 (12)0.0372 (12)0.0312 (12)0.0138 (10)0.0093 (10)0.0004 (10)
C80.0505 (16)0.0583 (17)0.0315 (13)0.0162 (13)0.0121 (11)0.0055 (12)
C90.0329 (12)0.0288 (11)0.0286 (11)0.0096 (9)0.0070 (10)0.0024 (9)
C110.0301 (11)0.0357 (12)0.0242 (10)0.0137 (9)0.0091 (9)0.0009 (9)
C200.0571 (17)0.0508 (16)0.0447 (15)0.0159 (13)0.0220 (13)0.0172 (13)
N10.0355 (10)0.0348 (10)0.0362 (11)0.0109 (8)0.0090 (9)0.0011 (8)
N20.0384 (11)0.0332 (10)0.0336 (10)0.0108 (8)0.0132 (9)0.0027 (8)
N30.0458 (12)0.0328 (11)0.0432 (12)0.0079 (9)0.0138 (10)0.0036 (9)
O10.0402 (9)0.0347 (9)0.0311 (8)0.0152 (7)0.0014 (7)−0.0049 (7)
O20.0393 (9)0.0438 (10)0.0444 (10)0.0208 (8)0.0005 (8)−0.0119 (8)
O30.0448 (10)0.0459 (10)0.0487 (10)0.0268 (8)0.0260 (8)0.0158 (8)
O40.0361 (9)0.0426 (9)0.0392 (9)0.0170 (7)0.0197 (7)0.0123 (7)
O50.0519 (13)0.0818 (18)0.0707 (16)0.0203 (13)−0.0022 (11)−0.0180 (13)
O60.0464 (13)0.103 (2)0.0975 (19)0.0238 (13)0.0171 (13)−0.0409 (16)
Geometric parameters (Å, °) top
Cd1—O12.2802 (16)C8—C201.370 (4)
Cd1—O2i2.2850 (17)C8—H80.9300
Cd1—O32.3286 (17)C9—O11.245 (3)
Cd1—O4ii2.3010 (16)C9—O21.253 (3)
Cd1—N12.365 (2)C9—C9i1.571 (4)
Cd1—N22.292 (2)C11—O31.245 (3)
C1—N11.341 (3)C11—O41.247 (3)
C1—C21.369 (4)C11—C11ii1.572 (4)
C1—H10.9300C20—N31.345 (4)
C2—C31.369 (5)C20—H200.9300
C2—H20.9300N2—N31.346 (3)
C3—C41.380 (4)N3—H3A0.8600
C3—H30.9300O2—Cd1i2.2850 (17)
C4—C51.386 (3)O4—Cd1ii2.3010 (16)
C4—H40.9300O5—H1W0.82 (4)
C5—N11.341 (3)O5—H2W0.82 (2)
C5—C71.471 (3)O6—H3W0.82 (4)
C7—N21.334 (3)O6—H4W0.82 (4)
C7—C81.400 (4)
O1—Cd1—O2i73.10 (6)N2—C7—C8110.4 (2)
O1—Cd1—N299.85 (7)N2—C7—C5119.4 (2)
O2i—Cd1—N2110.73 (7)C8—C7—C5130.2 (2)
O1—Cd1—O4ii153.29 (6)C20—C8—C7105.1 (2)
O2i—Cd1—O4ii89.10 (6)C20—C8—H8127.5
N2—Cd1—O4ii105.11 (6)C7—C8—H8127.5
O1—Cd1—O388.25 (6)O1—C9—O2125.3 (2)
O2i—Cd1—O390.72 (7)O1—C9—C9i118.1 (2)
N2—Cd1—O3158.43 (7)O2—C9—C9i116.6 (2)
O4ii—Cd1—O371.86 (6)O3—C11—O4125.3 (2)
O1—Cd1—N1106.71 (6)O3—C11—C11ii117.3 (2)
O2i—Cd1—N1177.56 (7)O4—C11—C11ii117.4 (2)
N2—Cd1—N171.72 (7)N3—C20—C8107.4 (2)
O4ii—Cd1—N190.22 (7)N3—C20—H20126.3
O3—Cd1—N186.84 (7)C8—C20—H20126.3
N1—C1—C2123.5 (3)C1—N1—C5117.8 (2)
N1—C1—H1118.3C1—N1—Cd1126.77 (18)
C2—C1—H1118.3C5—N1—Cd1115.34 (15)
C3—C2—C1118.7 (3)C7—N2—N3105.76 (19)
C3—C2—H2120.7C7—N2—Cd1116.09 (15)
C1—C2—H2120.7N3—N2—Cd1137.04 (15)
C2—C3—C4119.0 (3)C20—N3—N2111.3 (2)
C2—C3—H3120.5C20—N3—H3A124.3
C4—C3—H3120.5N2—N3—H3A124.3
C3—C4—C5119.4 (3)C9—O1—Cd1115.63 (14)
C3—C4—H4120.3C9—O2—Cd1i115.99 (14)
C5—C4—H4120.3C11—O3—Cd1115.95 (14)
N1—C5—C4121.6 (2)C11—O4—Cd1ii116.68 (14)
N1—C5—C7116.4 (2)H1W—O5—H2W115 (4)
C4—C5—C7121.9 (2)H3W—O6—H4W115 (4)
Symmetry codes: (i) −x+1, −y+2, −z+2; (ii) −x+1, −y+1, −z+2.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N3—H3A···O5iii0.861.852.696 (3)169
O5—H2W···O2iv0.82 (2)2.20 (2)2.861 (3)138 (3)
O6—H3W···O4v0.82 (4)2.34 (3)2.878 (3)124 (3)
O6—H4W···O3vi0.82 (4)2.01 (4)2.832 (3)171 (4)
Symmetry codes: (iii) x+1, y+1, z; (iv) x, y−1, z; (v) −x, −y+1, −z+1; (vi) x, y, z−1.
Table 1
Selected geometric parameters (Å) top
Cd1—O12.2802 (16)Cd1—O4ii2.3010 (16)
Cd1—O2i2.2850 (17)Cd1—N12.365 (2)
Cd1—O32.3286 (17)Cd1—N22.292 (2)
Symmetry codes: (i) −x+1, −y+2, −z+2; (ii) −x+1, −y+1, −z+2.
Table 2
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N3—H3A···O5iii0.861.852.696 (3)169
O5—H2W···O2iv0.82 (2)2.20 (2)2.861 (3)138 (3)
O6—H3W···O4v0.82 (4)2.34 (3)2.878 (3)124 (3)
O6—H4W···O3vi0.82 (4)2.01 (4)2.832 (3)171 (4)
Symmetry codes: (iii) x+1, y+1, z; (iv) x, y−1, z; (v) −x, −y+1, −z+1; (vi) x, y, z−1.
Acknowledgements top

The authors acknowledge financial support from the program for talent introduction in Guangdong Higher Education Institutions and the scientific research start-up funds of talent introduction in Maoming University.

references
References top

Bruker (2003). SMART, SAINT-Plus and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.

Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.

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Ward, M. D., McCleverty, J. A. & Jeffery, J. C. (2001). Coord. Chem. Rev. 222, 251–272.