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Acta Cryst. (2008). E64, m808    [ doi:10.1107/S1600536808013688 ]

Poly[aqua[[mu]3-5-(2-carboxylatophenyl)-1H-tetrazolato]zinc(II)]

X.-Z. Li and Z.-R. Qu

Abstract top

The title coordination polymer, [Zn(C8H4N4O2)(H2O)]n, was prepared by the hydrothermal reaction of zinc nitrate and 2-(1H-tetrazol-5-yl)benzoic acid. Two types of coordinated zinc cations exist in the structure. One is tetrahedrally coordinated by two O and two N from two ligands, the other is octahedrally coordinated by two N and two O from two ligands at equatorial sites and by two O atoms of water molecules at axial sites, resulting in a two-dimensional framework. The crystal structure is stabilized by intramolecular O-H...O and O-H...N hydrogen bonds.

Comment top

Coordination frameworks have received much attention over the past decade because of their potential applications. Multifunctional organic ligands are necessary to construct such frameworks. 2-(1H-Tetrazol-5-yl)benzoic acid is a ligand with two functional groups, a carboxylate group and a tetrazole ring. Tetrazole compounds have a wide range of applications in coordination chemistry, medicinal chemistry and material science (Hu, et al., 2007; Xiong, et al., 2002; Xue, et al., 2002; Wang, et al., 2005; Dunica, et al., 1991; Wittenberger & Donner, 1993). We report here the crystal structure of the title compound, which was obtained by the hydrothermal reaction of zinc nitrate and 2-(1H-tetrazol-5-yl)benzoic acid.

In the structure of the title compound, two types of coordinated zinc cations exist (Fig. 1). Zn1 is tetrahedrally coordinated by two O and two N from two ligands, while Zn2 is octahedrally coordinated, with two N and two O from two ligands at equatorial sites and two O atoms of H2O molecules at axial sites, resulting in a two-dimensional framework (Fig 2). Bond lengths and angles in the compound are within normal ranges (Li et al., 2005). The crystal structure is stabilized by intramolecular O—H···O and O—H···N hydrogen bonds (Table 1).

Related literature top

For the chemistry of tetrazoles, see: Xiong et al. (2002); Xue et al. (2002); Dunica et al. (1991); Wang et al. (2005); Wittenberger et al. (1993); Hu et al. (2007). For the crystal structure of a related compound, see: Li et al. (2005).

Experimental top

A mixture of Zn(NO3)2 (0.2 mmol) and 2-(1H-tetrazol-5-yl)benzoic acid (0.2 mmol) in H2O (4 ml) was heated in Pyrex tube at 100°C for two days. After slowly cooling down to room temperature over a period of 12 h, colourless crystals of the title compound suitable for diffraction were isolated.

Refinement top

Positional parameters of all the H atoms were calculated geometrically and were allowed to ride on their parent atoms, with C—H = 0.93 Å, O—H = 0.81Å and with Uiso(H) = 1.2 Ueq(C) or 1.5 Ueq(O).

Computing details top

Data collection: CrystalClear (Rigaku, 2005); cell refinement: CrystalClear (Rigaku, 2005); data reduction: CrystalClear (Rigaku, 2005); 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: PRPKAPPA (Ferguson, 1999).

Figures top
[Figure 1] Fig. 1. A partial packing diagram of the title compound, with displacement ellipsoids drawn at the 30% probability level. H atoms are omitted for clarity. [Symmetry codes: (A) 2-x, -y, 1-z; (B) x, y-1, z; (C) 2-x, y-1, 1/2-z; (D) 2-x, y, 1/2-z].
[Figure 2] Fig. 2. Packing diagram of the title compound, showing the structure along the b axis. H atoms are omitted for clarity.
Poly[aqua[µ3-5-(2-carboxylatophenyl)-1H-tetrazolato]zinc(II)] top
Crystal data top
[Zn(C8H4N4O2)(H2O)]F000 = 1088.0
Mr = 271.56Dx = 1.888 Mg m−3
Monoclinic, C2/cMo Kα radiation
λ = 0.71073 Å
Hall symbol: -C 2ycCell parameters from 1979 reflections
a = 19.696 (8) Åθ = 3.1–27.5º
b = 7.1340 (18) ŵ = 2.57 mm−1
c = 14.932 (6) ÅT = 293 (2) K
β = 114.39 (2)ºBlock, colourless
V = 1910.9 (12) Å30.07 × 0.07 × 0.06 mm
Z = 8
Data collection top
Rigaku SCXmini
diffractometer		2173 independent reflections
Radiation source: fine-focus sealed tube1623 reflections with I > 2σ(I)
Monochromator: graphiteRint = 0.085
Detector resolution: 13.6612 pixels mm-1θmax = 27.5º
T = 293(2) Kθmin = 3.1º
ω scansh = −25→25
Absorption correction: multi-scan
(CrystalClear; Rigaku, 2005)		k = −9→9
Tmin = 0.835, Tmax = 0.860l = −19→19
9320 measured reflections
Refinement top
Refinement on F2Secondary atom site location: difference Fourier map
Least-squares matrix: fullHydrogen site location: inferred from neighbouring sites
R[F2 > 2σ(F2)] = 0.050H-atom parameters constrained
wR(F2) = 0.112  w = 1/[σ2(Fo2) + (0.0929P)2 + 0.0509P]
whereP = (Fo2 + 2Fc2)/3
S = 1.08(Δ/σ)max < 0.001
2173 reflectionsΔρmax = 0.63 e Å−3
147 parametersΔρmin = −0.60 e Å−3
Primary atom site location: structure-invariant direct methodsExtinction correction: none
Crystal data top
[Zn(C8H4N4O2)(H2O)]V = 1910.9 (12) Å3
Mr = 271.56Z = 8
Monoclinic, C2/cMo Kα
a = 19.696 (8) ŵ = 2.57 mm−1
b = 7.1340 (18) ÅT = 293 (2) K
c = 14.932 (6) Å0.07 × 0.07 × 0.06 mm
β = 114.39 (2)º
Data collection top
Rigaku SCXmini
diffractometer		2173 independent reflections
Absorption correction: multi-scan
(CrystalClear; Rigaku, 2005)		1623 reflections with I > 2σ(I)
Tmin = 0.835, Tmax = 0.860Rint = 0.085
9320 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.050147 parameters
wR(F2) = 0.112H-atom parameters constrained
S = 1.08Δρmax = 0.63 e Å−3
2173 reflectionsΔρmin = −0.60 e Å−3
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 F^2^ against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The threshold expression of F^2^ > σ(F^2^) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ 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
Zn11.0000−0.31787 (9)0.25000.0245 (2)
Zn21.00000.00000.50000.0242 (2)
C10.9761 (2)0.3503 (5)0.3649 (3)0.0202 (8)
C20.8990 (2)0.3170 (6)0.2905 (3)0.0213 (8)
C30.8527 (2)0.4731 (6)0.2629 (3)0.0289 (10)
H30.86930.58590.29590.035*
C40.7821 (3)0.4630 (6)0.1866 (4)0.0383 (12)
H40.75140.56810.16930.046*
C50.7577 (3)0.2978 (7)0.1370 (4)0.0410 (12)
H50.71040.29100.08580.049*
C60.8032 (3)0.1407 (6)0.1630 (3)0.0339 (11)
H60.78640.02990.12790.041*
C70.8733 (2)0.1459 (6)0.2405 (3)0.0222 (9)
C80.9165 (2)−0.0327 (5)0.2671 (3)0.0217 (9)
N11.0151 (2)0.2573 (5)0.4466 (2)0.0241 (8)
N21.0788 (2)0.3533 (5)0.4939 (3)0.0295 (9)
N31.0792 (2)0.4999 (5)0.4424 (3)0.0280 (8)
N41.01491 (19)0.5018 (4)0.3598 (2)0.0220 (7)
O10.91662 (17)−0.1326 (4)0.1958 (2)0.0270 (7)
O20.94994 (17)−0.0846 (4)0.3536 (2)0.0314 (7)
O1W0.89412 (16)0.0990 (4)0.4984 (2)0.0322 (7)
H1W0.89130.06810.54970.048*
H2W0.88720.20610.50350.048*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Zn10.0335 (4)0.0167 (3)0.0215 (4)0.0000.0097 (3)0.000
Zn20.0341 (4)0.0186 (4)0.0186 (4)−0.0009 (3)0.0097 (3)0.0027 (3)
C10.026 (2)0.0153 (19)0.021 (2)−0.0018 (17)0.0104 (17)0.0000 (16)
C20.021 (2)0.022 (2)0.0183 (19)−0.0016 (17)0.0057 (17)0.0025 (16)
C30.032 (2)0.023 (2)0.030 (2)0.0042 (19)0.011 (2)0.0001 (18)
C40.031 (3)0.033 (3)0.045 (3)0.013 (2)0.009 (2)0.003 (2)
C50.026 (2)0.043 (3)0.039 (3)0.004 (2)−0.002 (2)−0.001 (2)
C60.029 (2)0.029 (2)0.035 (3)0.001 (2)0.004 (2)−0.004 (2)
C70.024 (2)0.019 (2)0.022 (2)0.0019 (17)0.0094 (18)0.0021 (16)
C80.023 (2)0.021 (2)0.021 (2)−0.0050 (16)0.0088 (18)−0.0013 (16)
N10.032 (2)0.0186 (17)0.0189 (17)−0.0044 (15)0.0083 (16)0.0033 (14)
N20.029 (2)0.0235 (19)0.030 (2)−0.0030 (16)0.0062 (17)0.0079 (16)
N30.031 (2)0.0223 (19)0.0235 (19)−0.0053 (15)0.0041 (17)0.0025 (14)
N40.0271 (18)0.0168 (17)0.0210 (18)−0.0020 (14)0.0088 (15)0.0001 (13)
O10.0390 (18)0.0226 (15)0.0179 (14)0.0056 (13)0.0101 (13)−0.0029 (12)
O20.048 (2)0.0232 (16)0.0191 (15)0.0050 (14)0.0100 (15)−0.0004 (12)
O1W0.0385 (18)0.0309 (17)0.0284 (17)0.0003 (15)0.0150 (15)−0.0012 (14)
Geometric parameters (Å, °) top
Zn1—O1i2.000 (3)C3—H30.9300
Zn1—O12.000 (3)C4—C51.369 (6)
Zn1—N4ii2.008 (3)C4—H40.9300
Zn1—N4iii2.008 (3)C5—C61.387 (6)
Zn2—N12.072 (3)C5—H50.9300
Zn2—N1iv2.072 (3)C6—C71.389 (6)
Zn2—O2iv2.082 (3)C6—H60.9300
Zn2—O22.082 (3)C7—C81.491 (5)
Zn2—O1Wiv2.193 (3)C8—O21.240 (5)
Zn2—O1W2.193 (3)C8—O11.281 (5)
C1—N11.321 (5)N1—N21.345 (5)
C1—N41.343 (5)N2—N31.300 (4)
C1—C21.484 (5)N3—N41.353 (5)
C2—C31.390 (5)N4—Zn1v2.008 (3)
C2—C71.411 (5)O1W—H1W0.8200
C3—C41.389 (6)O1W—H2W0.7851
O1i—Zn1—O197.27 (17)C2—C3—H3119.5
O1i—Zn1—N4ii124.90 (13)C5—C4—C3119.8 (4)
O1—Zn1—N4ii105.93 (12)C5—C4—H4120.1
O1i—Zn1—N4iii105.93 (12)C3—C4—H4120.1
O1—Zn1—N4iii124.90 (13)C4—C5—C6120.2 (4)
N4ii—Zn1—N4iii100.34 (19)C4—C5—H5119.9
N1—Zn2—N1iv180.000 (1)C6—C5—H5119.9
N1—Zn2—O2iv93.81 (13)C5—C6—C7121.1 (4)
N1iv—Zn2—O2iv86.19 (13)C5—C6—H6119.4
N1—Zn2—O286.19 (13)C7—C6—H6119.4
N1iv—Zn2—O293.81 (13)C6—C7—C2118.7 (4)
O2iv—Zn2—O2180.000 (1)C6—C7—C8117.4 (4)
N1—Zn2—O1Wiv90.11 (13)C2—C7—C8123.9 (3)
N1iv—Zn2—O1Wiv89.89 (13)O2—C8—O1121.1 (4)
O2iv—Zn2—O1Wiv92.66 (12)O2—C8—C7122.1 (4)
O2—Zn2—O1Wiv87.34 (12)O1—C8—C7116.8 (4)
N1—Zn2—O1W89.89 (13)C1—N1—N2106.9 (3)
N1iv—Zn2—O1W90.11 (13)C1—N1—Zn2132.8 (3)
O2iv—Zn2—O1W87.34 (12)N2—N1—Zn2120.0 (3)
O2—Zn2—O1W92.66 (12)N3—N2—N1109.3 (3)
O1Wiv—Zn2—O1W180.000 (1)N2—N3—N4108.4 (3)
N1—C1—N4109.2 (4)C1—N4—N3106.3 (3)
N1—C1—C2129.5 (4)C1—N4—Zn1v131.8 (3)
N4—C1—C2121.1 (3)N3—N4—Zn1v121.1 (3)
C3—C2—C7119.2 (4)C8—O1—Zn1108.4 (3)
C3—C2—C1115.9 (4)C8—O2—Zn2145.6 (3)
C7—C2—C1124.5 (4)Zn2—O1W—H1W109.5
C4—C3—C2120.9 (4)Zn2—O1W—H2W121.0
C4—C3—H3119.5H1W—O1W—H2W95.2
Symmetry codes: (i) −x+2, y, −z+1/2; (ii) −x+2, y−1, −z+1/2; (iii) x, y−1, z; (iv) −x+2, −y, −z+1; (v) x, y+1, z.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O1W—H1W···O1vi0.822.082.804 (4)147
O1W—H2W···N3vii0.792.252.976 (5)155
Symmetry codes: (vi) x, −y, z+1/2; (vii) −x+2, −y+1, −z+1.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O1W—H1W···O1i0.822.082.804 (4)147
O1W—H2W···N3ii0.792.252.976 (5)155
Symmetry codes: (i) x, −y, z+1/2; (ii) −x+2, −y+1, −z+1.
Acknowledgements top

This work was supported by a Start-up Grant from Southeast University to ZRQ.

references
References top

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