Received 19 December 2012
In the title compound, [Co(H2O)6](C14H10O6)·2H2O, the 2,2'-[naphthalene-1,8-diylbis(oxy)]diacetate dianion L is not coordinated to the CoII ion. The asymmetric unit contains half of the L dianion, half of a [Co(H2O)6]2+ cation (both molecules being completed by inversion symmetry), and one water molecule. The crystal packing features O-HO hydrogen bonding between the carboxylate groups, the aqua ligands and the hydrate water molecules.
In recent years, metal complexes have been synthezised with potential applications in molecular sorption, electrical conductivity, catalysis, magnetism, non-linear optics and molecular sensing, see: James (2003); Murray et al. (2009); Karmakar et al. (2009); Kurmoo (2009); Bradshaw et al. (2005). The 5-carboxymethoxy-naphtalene1-yl(oxy)-acetate ligand can provide a dominant packing feature and it often controls the supramolecular assembly, see: Desiraju (2007). For Cd complexes with different co-ligands, see: Deka et al. (2011); Li et al. (2012) and for Zn complexes, see: Mondal et al. (2008).
Data collection: SMART (Siemens, 1996); cell refinement: SAINT (Siemens, 1996); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: VM2185 ).
This work was supported by the Fundamental Research Funds for the Central Universities (No. CQDXWL-2012-024).
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