Acta Cryst. (2007). E63, m2986  [ doi:10.1107/S1600536807056164 ]

Poly[₆-benzene-1,2,4,5-tetracarboxylato-⁶O¹:O²:O^2':O⁴:O⁵:O^5'-bis[diaquazinc(II)]]

J. Wang, L. Lu, B. Yang, B.-Z. Zhao and S. W. Ng

Abstract: The benzenetetracarboxylate tetraanion in the title compound, [Zn₂(C₈H₂O₈)(H₂O)₄]_n, lies on a center of inversion. Two delocalized carboxylate -CO₂ groups are each connected to two different diaquazinc units, whereas the other two localized carboxylate -CO₂ are each bonded to one different diaquazinc unit. The metal atom is five-coordinate as a consequence of such ₆-bridging; the water molecules occupy an axial and an equatorial site of the trigonal bipyramid in the three-dimensional network. The architecture is further consolidated by extensive hydrogen bonding in which one water molecule serves as a donor and the other as both a donor and an acceptor.

Online 14 November 2007

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