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Acta Cryst. (2009). E65, m831    [ doi:10.1107/S1600536809023940 ]

Diaquabis{2-[5-(2-pyridyl)-2H-tetrazol-2-yl]acetato-[kappa]2N4,N5}zinc(II)

B. Wang

Abstract top

The title compound, [Zn(C8H6N5O2)2(H2O)2], was synthesized by hydrothermal reaction of ZnBr2 with 2-[5-(2-pyridyl)-2H-tetrazol-2-yl]acetic acid. The ZnII atom lies on an inversion center in a distorted octahedral environment with two planar trans-related N,N'-chelating 2-[5-(2-pyridyl)-2H-tetrazol-2-yl]acetic acid ligands in the equatorial plane and two water molecules in the axial positions. In the crystal, O-H...O hydrogen bonds generate an infinite three-dimensional network.

Comment top

The tetrazole functional group has found a wide range of applications in coordination chemistry as ligands, in medicinal chemistry as a metabolically stable surrogate for a carboxylic acid group, and in materials science as high density energy materials(Wang et al., 2005; Fu et al., 2008; Wittenberger et al.,1993). We report here the crystal structure of the title compound, Bis[2-(5-(pyridin-2-yl)-2H-tetrazol-2-yl)acetic-K2N1,N2]Zinc(II).

In the title compound, the ZnII atom lies on an inversion center. The distorted octahedral ZnII environment contains two planar trans-related N,N-chelating 2-(5-(pyridin-2-yl)-2H-tetrazol-2-yl)acetic acid ligands in the equatorial plane and two water ligands in the axial positions. The pyridine and tetrazole rings are nearly coplanar and only twisted from each other by a dihedral angle of 7.06 ( 1 )°. The geometric parameters of the tetrazole rings are comparable to those in related molecules (Wittenberger et al., 1993; Dai & Fu 2008; Wen 2008).

The O atoms from water molecules are involved in intermolecular O—H···O hydrogen bonds building up an infinite three-dimensional network (Table 1 and Fig.2).

Related literature top

For the chemisty of tetrazoles, see: Fu et al. (2008); Dai & Fu (2008); Wang et al. (2005); Wen (2008); Wittenberger & Donner (1993).

Experimental top

A mixture of 2-(5-(pyridin-2-yl)-2H-tetrazol-2-yl)acetic acid (0.2 mmol), ZnBr2 (0.4 mmol), distilled water (1 ml) and a few drops of ethanol sealed in a glass tube was maintained at 110 °C. Colorless block crystals suitable for X-ray analysis were obtained after 3 days.

Refinement top

All H atoms attached to C atoms were fixed geometrically and treated as riding with C-H = 0.93 Å (aromatic) and 0.97 Å (methylene) with Uiso(H) = 1.2Ueq(C). H atoms of water molecule located in difference Fourier maps and freely refined using restraints (O-H= 0.85Å and H···H= 1.39Å with Uĩso~(H) = 1.5U~eq~(O). In the last stage of refinement they were treated as riding on the O atom.

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: ORTEPIII (Burnett & Johnson, 1996), ORTEP-3 for Windows (Farrugia, 1997) and XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. Molecular view of the title compound with the atomic numbering scheme. Displacement ellipsoids are drawn at the 30% probability level.[Symmetry codes: (i) -x+1, -y+1, -z+1]
[Figure 2] Fig. 2. The crystal packing of the title compound viewed along the a axis showing the three dimensionnal hydrogen bondings network (dashed line). Hydrogen atoms not involved in hydrogen bonding have been omitted for clarity.
Diaquabis{2-[5-(2-pyridyl)-2H-tetrazol-2-yl]acetato- κ2N4,N5}zinc(II) top
Crystal data top
[Zn(C8H6N5O2)2(H2O)2]F(000) = 520
Mr = 509.76Dx = 1.784 Mg m−3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 1984 reflections
a = 7.6407 (15) Åθ = 3.6–27.5°
b = 8.2583 (17) ŵ = 1.36 mm−1
c = 15.155 (3) ÅT = 298 K
β = 97.17 (3)°Block, colorless
V = 948.8 (3) Å30.35 × 0.25 × 0.20 mm
Z = 2
Data collection top
Rigaku Mercury2
diffractometer		2177 independent reflections
Radiation source: fine-focus sealed tube1984 reflections with I > 2σ(I)
graphiteRint = 0.031
Detector resolution: 13.6612 pixels mm-1θmax = 27.5°, θmin = 3.6°
CCD profile fitting scansh = −9→9
Absorption correction: multi-scan
(CrystalClear; Rigaku, 2005)		k = −10→10
Tmin = 0.762, Tmax = 0.841l = −19→19
9600 measured reflections
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)] = 0.027Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.075H-atom parameters constrained
S = 1.11 w = 1/[σ2(Fo2) + (0.0393P)2 + 0.3221P]
where P = (Fo2 + 2Fc2)/3
2177 reflections(Δ/σ)max < 0.001
151 parametersΔρmax = 0.25 e Å−3
0 restraintsΔρmin = −0.41 e Å−3
Crystal data top
[Zn(C8H6N5O2)2(H2O)2]V = 948.8 (3) Å3
Mr = 509.76Z = 2
Monoclinic, P21/cMo Kα radiation
a = 7.6407 (15) ŵ = 1.36 mm−1
b = 8.2583 (17) ÅT = 298 K
c = 15.155 (3) Å0.35 × 0.25 × 0.20 mm
β = 97.17 (3)°
Data collection top
Rigaku Mercury2
diffractometer		2177 independent reflections
Absorption correction: multi-scan
(CrystalClear; Rigaku, 2005)		1984 reflections with I > 2σ(I)
Tmin = 0.762, Tmax = 0.841Rint = 0.031
9600 measured reflectionsθmax = 27.5°
Refinement top
R[F2 > 2σ(F2)] = 0.027H-atom parameters constrained
wR(F2) = 0.075Δρmax = 0.25 e Å−3
S = 1.11Δρmin = −0.41 e Å−3
2177 reflectionsAbsolute structure: ?
151 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
Special details top

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 (Å2) top
xyzUiso*/Ueq
Zn10.50000.50000.50000.02160 (10)
N10.32018 (18)0.61053 (17)0.39557 (9)0.0230 (3)
O1W0.72023 (15)0.59206 (14)0.44676 (8)0.0267 (3)
H1WA0.75640.51990.41350.040*
H1WB0.80130.62330.48650.040*
N50.45085 (17)0.73160 (16)0.55431 (9)0.0212 (3)
O1−0.0465 (2)0.79027 (18)0.07872 (9)0.0417 (3)
N20.22867 (19)0.57379 (18)0.31894 (9)0.0253 (3)
O20.16960 (18)0.89846 (16)0.17318 (8)0.0353 (3)
N30.11283 (18)0.68988 (17)0.30393 (9)0.0238 (3)
C50.3275 (2)0.82286 (19)0.50739 (10)0.0211 (3)
C60.2532 (2)0.74873 (19)0.42345 (10)0.0213 (3)
N40.12076 (19)0.80232 (17)0.36653 (9)0.0260 (3)
C10.5300 (2)0.7902 (2)0.63096 (11)0.0275 (4)
H10.61490.72710.66430.033*
C40.2795 (2)0.9734 (2)0.53507 (12)0.0281 (4)
H40.19251.03360.50130.034*
C20.4912 (3)0.9404 (2)0.66288 (12)0.0320 (4)
H20.55010.97870.71620.038*
C30.3640 (3)1.0324 (2)0.61438 (13)0.0330 (4)
H30.33491.13390.63480.040*
C7−0.0122 (2)0.6946 (2)0.22339 (11)0.0303 (4)
H7A−0.12550.73070.23840.036*
H7B−0.02730.58580.19960.036*
C80.0445 (2)0.8059 (2)0.15154 (11)0.0258 (3)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Zn10.02190 (16)0.02041 (15)0.02109 (15)0.00495 (9)−0.00280 (10)−0.00076 (9)
N10.0233 (7)0.0239 (7)0.0206 (6)0.0030 (5)−0.0022 (5)0.0012 (5)
O1W0.0250 (6)0.0283 (6)0.0263 (6)0.0004 (5)0.0008 (5)−0.0052 (5)
N50.0203 (6)0.0205 (6)0.0221 (7)0.0006 (5)−0.0002 (5)0.0001 (5)
O10.0499 (8)0.0481 (9)0.0238 (6)0.0109 (7)−0.0081 (6)0.0047 (6)
N20.0269 (7)0.0258 (7)0.0213 (7)0.0009 (6)−0.0041 (5)0.0027 (5)
O20.0390 (7)0.0371 (7)0.0304 (7)−0.0054 (6)0.0071 (5)0.0062 (6)
N30.0234 (7)0.0250 (7)0.0211 (7)−0.0008 (5)−0.0043 (5)0.0048 (5)
C50.0198 (7)0.0216 (7)0.0217 (8)−0.0003 (6)0.0018 (6)0.0029 (6)
C60.0211 (7)0.0211 (7)0.0214 (8)0.0005 (6)0.0012 (6)0.0044 (6)
N40.0254 (7)0.0257 (7)0.0253 (7)0.0031 (6)−0.0031 (5)0.0032 (6)
C10.0249 (8)0.0301 (9)0.0258 (8)−0.0007 (7)−0.0034 (7)−0.0010 (7)
C40.0293 (9)0.0231 (8)0.0317 (9)0.0049 (7)0.0035 (7)0.0030 (7)
C20.0362 (10)0.0319 (9)0.0270 (9)−0.0047 (8)0.0002 (7)−0.0069 (7)
C30.0430 (11)0.0229 (8)0.0342 (10)0.0004 (7)0.0089 (8)−0.0060 (7)
C70.0284 (9)0.0334 (9)0.0254 (8)−0.0047 (7)−0.0109 (7)0.0067 (7)
C80.0292 (8)0.0260 (8)0.0217 (8)0.0103 (7)0.0012 (6)0.0034 (6)
Geometric parameters (Å, °) top
Zn1—O1W2.0974 (13)N3—N41.324 (2)
Zn1—O1Wi2.0974 (13)N3—C71.453 (2)
Zn1—N52.1340 (14)C5—C41.377 (2)
Zn1—N5i2.1340 (14)C5—C61.461 (2)
Zn1—N1i2.1640 (14)C6—N41.321 (2)
Zn1—N12.1640 (14)C1—C21.377 (3)
N1—N21.3142 (19)C1—H10.9300
N1—C61.341 (2)C4—C31.380 (3)
O1W—H1WA0.8486C4—H40.9300
O1W—H1WB0.8480C2—C31.373 (3)
N5—C11.332 (2)C2—H20.9300
N5—C51.339 (2)C3—H30.9300
O1—C81.235 (2)C7—C81.529 (2)
N2—N31.305 (2)C7—H7A0.9700
O2—C81.236 (2)C7—H7B0.9700
O1W—Zn1—O1Wi180.0N5—C5—C4122.90 (15)
O1W—Zn1—N590.67 (5)N5—C5—C6113.44 (14)
O1Wi—Zn1—N589.33 (5)C4—C5—C6123.65 (15)
O1W—Zn1—N5i89.33 (5)N4—C6—N1111.77 (14)
O1Wi—Zn1—N5i90.67 (5)N4—C6—C5127.65 (15)
N5—Zn1—N5i180.000 (1)N1—C6—C5120.58 (14)
O1W—Zn1—N1i88.14 (5)C6—N4—N3101.29 (13)
O1Wi—Zn1—N1i91.86 (5)N5—C1—C2122.66 (16)
N5—Zn1—N1i102.84 (5)N5—C1—H1118.7
N5i—Zn1—N1i77.16 (5)C2—C1—H1118.7
O1W—Zn1—N191.86 (5)C5—C4—C3118.07 (17)
O1Wi—Zn1—N188.14 (5)C5—C4—H4121.0
N5—Zn1—N177.16 (5)C3—C4—H4121.0
N5i—Zn1—N1102.84 (5)C3—C2—C1118.66 (17)
N1i—Zn1—N1180.0C3—C2—H2120.7
N2—N1—C6107.04 (13)C1—C2—H2120.7
N2—N1—Zn1140.18 (11)C2—C3—C4119.59 (17)
C6—N1—Zn1111.18 (10)C2—C3—H3120.2
Zn1—O1W—H1WA108.1C4—C3—H3120.2
Zn1—O1W—H1WB112.8N3—C7—C8113.54 (14)
H1WA—O1W—H1WB111.8N3—C7—H7A108.9
C1—N5—C5118.12 (14)C8—C7—H7A108.9
C1—N5—Zn1125.41 (11)N3—C7—H7B108.9
C5—N5—Zn1116.46 (11)C8—C7—H7B108.9
N3—N2—N1105.00 (13)H7A—C7—H7B107.7
N2—N3—N4114.90 (13)O1—C8—O2129.21 (17)
N2—N3—C7121.74 (15)O1—C8—C7113.30 (16)
N4—N3—C7123.35 (14)O2—C8—C7117.48 (15)
Symmetry codes: (i) −x+1, −y+1, −z+1.
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O1W—H1WB···O1ii0.851.852.6891 (19)172
O1W—H1WA···O2iii0.851.802.6365 (17)169
Symmetry codes: (ii) x+1, −y+3/2, z+1/2; (iii) −x+1, y−1/2, −z+1/2.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
O1W—H1WB···O1i0.851.852.6891 (19)172
O1W—H1WA···O2ii0.851.802.6365 (17)169
Symmetry codes: (i) x+1, −y+3/2, z+1/2; (ii) −x+1, y−1/2, −z+1/2.
Acknowledgements top

This work was supported by a start-up grant from Southeast University to Professor Ren-Gen Xiong.

references
References top

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