Acta Cryst. (2008). E64, m466-m467  [ doi:10.1107/S1600536808003930 ]

Guanidinium (aqua-2O)(4-hydroxy-6-carboxypyridine-2-carboxylato-2³O²,N,O⁶)(-4-hydroxypyridine-2,6-dicarboxylato-1:2⁴O²,N,O⁶:O²)(4-hydroxypyridine-2,6-dicarboxylato-1³O²,N,O⁶)dizincate(II) dihydrate

H. Aghabozorg, S. Saadaty, E. Motyeian, M. Ghadermazi and F. Manteghi

Abstract: The title compound, (CH₆N₃)[Zn₂(C₇H₃NO₅)₂(C₇H₄NO₅)(H₂O)]·2H₂O, has an anionic binuclear complex of Zn^II balanced with a guanidinium cation. There are two uncoordinated water molecules in the structure. The asymmetric unit of the compound has two different coordination types (the coordination of Zn1 is distorted trigonal-bipyramidal, while that of Zn2 is distorted octahedral) of Zn^II in the crystal structure that are bridged to each other via one hypydc^2- group (hypydcH₂ is 4-hydroxypyridine-2,6-dicarboxylic acid). A variety of intermolecular O-HO, N-HO and C-HO hydrogen bonds involving water molecules, cations and anions, and also a weak - interaction [3.798 (1) Å], are responsible for extending the structure into a three-dimensional network.

Online 13 February 2008

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