Received 14 November 2012
The dinuclear title complex, [Co2(C15H8O7)2(H2O)6], lies across an inversion center. The unique CoII ion is coordinated in a slightly distorted octahedral coordination geometry by two O atoms from a chelating 4-(carboxyphenoxy)phthalate ligand, three water O atoms and a further O atom from a bridging carboxylate group of a symmetry-related 4-(carboxyphenoxy)phthalate ligand. In the crystal, O-HO hydrogen bonds link the molecules into a three-dimensional network.
For background to metal-organic coordination complexes, see: Wang et al. (2009); Leininger et al. (2000). For Co-O bond lengths in related structures, see: Chu et al. (2011). For the isotypic NiII complex and the synthesis, see: Cai (2011).
Data collection: APEX2 (Bruker, 2004); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LH5557 ).
The author thanks the University of Science and Technology, Beijing, for support.
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