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Acta Cryst. (2013). E69, m252
[ doi:10.1107/S1600536813008933 ]

catena-Poly[[[diaquacobalt(II)]-bis{[mu]-2-[3-(4-carboxylatophenyl)pyridin-1-ium-1-yl]acetato}] dihydrate]

W. Gao and X.-M. Zhang

Abstract: In the title polymeric coordination compound, {[Co(C14H10NO4)2(H2O)2]·2H2O}n, the CoII ion resides on an inversion center and exhibits a distorted octahedral coordination geometry defined by four O atoms from two pairs of equivalent monodentate carboxylate groups from 2-[3-(4-carboxylatophenyl)pyridin-1-ium-1-yl]acetate ligands and by two O atoms from two equivalent coordinating water molecules. The zwitterionic dicarboxylate ligands serve as bridges with two monodentate carboxylate and the metal ions are linked by double bridges, forming polymeric chains running along [01-1]. The chains are further stabilized and associated into layers parallel to (011) through intra- and interchain hydrogen bonding and [pi]-[pi] stacking interactions [interplanar and centroid-centroid distances of 3.658 (3) Å and 3.653 (2) Å, respectively].

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