Acta Cryst. (2004). E60, m1331-m1333  [ doi:10.1107/S1600536804020859 ]

Tetrahedral and octahedral coordination for zinc in polymeric tris(₃-4-carboxyphenoxyacetato)di-₃-hydroxo-bis(₂-4,4'-bipyridine)tetrazinc(IV) dihydrate

S. Gao, L.-H. Huo, C.-S. Gu, J.-G. Zhao and S. W. Ng

Abstract: The hydroxide group in the centrosymmetric title complex, {[Zn₄(C₉H₆O₅)₃(OH)₂(C₁₀H₈N₂)₂]·2H₂O}_n, which adopts a three-dimensional network structure, bridges three Zn atoms. One of the symmetry-independent dicarboxylate groups chelates to a Zn-OH-Zn unit through the carboxyl group on the aromatic ring, while its other oxyacetate arm uses only one O atom for binding. The other dicarboxylate dianion is disordered over a center of inversion and functions as a chelating ligand to two Zn-OH-Zn units. The modes of coordination by the hydroxide, heterocycle and dicarboxylate ligands give rise to tetrahedral coordination for one Zn atom and octahedral coordination for the other.

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