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Acta Cryst. (2012). E68, m1150
[ doi:10.1107/S1600536812034113 ]

Poly[[diaqua([mu]8-benzene-1,2,4,5-tetracarboxylato)calciumzinc] monohydrate]

Y.-Y. Jia, B. Chen and Y.-X. Yuan

Abstract: In the title complex, {[CaZn(C10H2O8)(H2O)2]·H2O}n, the ZnII ion is coordinated by four O atoms from four benzene-1,2,4,5-tetracarboxylate anions in a distorted tetrahedral geometry. The CaII ion is eight-coordinated by six O atoms from four benzene-1,2,4,5-tetracarboxylate anions and by two water molecules in a distorted square-antiprismatic geometry. The CaII and ZnII ions and the lattice water molecule are located on twofold rotation axes; the centroid of the benzene-1,2,4,5-tetracarboxylate anion is located on a centre of inversion. The [mu]8-bridging mode of the anion results in the formation of a three-dimensional structure with channels extending along [100] in which lattice water molecules are situated. Intermolecular O-H...O hydrogen bonds involving the coordinating and lattice water molecules as donors and the carboxylate O atoms and lattice water molecules as acceptors are present in the structure.


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