Received 18 July 2013
The title compound, Na(C2H10N2)[Co(C2O4)(C2H8N2)2]4[H5(P2W18O62)2]·14H2O, prepared under hydrothermal conditions, consists of two Dawson-type [P2W18O62]6- anions, four isolated [Co(en)2(ox)]+ cations (en = ethylenediamine and ox = oxalate), one Na+ cation, one [H2en]2+ cation, and a number of ordered (14) and disordered solvent water molecules. The [P2W18O62]6- polyoxidometalate anion has site symmetry 1 and contains two structurally distinct types of W atoms: viz. six W atoms on vertical pseudo-mirror planes grouped in two sets of three, and 12 equatorial W atoms that do not lie in the pseudo-mirror planes grouped in two sets of six. In each [Co(en)2(ox)]+ cation, the CoIII ion is coordinated by four N atoms from two en ligands and two O atoms from the ox ligands, completing a distorted octahedral structure. The sodium cation lies on an inversion centre and additionally links the complex cations and anions. In the crystal, the various units are linked by N-HO and O-HO hydrogen bonds, which together with C-HO hydrogen bonds form a three-dimensional structure. The contribution of a region of disordered electron density, possibly highly disordered solvent water molecules, to the scattering was removed with the SQUEEZE option of PLATON [Spek (2009). Acta Cryst. D65, 148-155]. To equilibrate the charges five H+ ions have been added to the polyoxidometalate. These H+ ions and the disordered solvent contribution were not included in the reported molecular weight and density.
For general background to polyoxidometalate-based materials, see: Du et al. (2013); Dolbecq et al. (2010); Zheng & Yang (2012). For organic-inorganic hybrid materials constructed from components based on saturated polyoxidoanions and transition metal coordination complexes (TMCs), see: Liu et al. (2011); Wang et al. (2010). For related organic-inorganic hybrid compounds based on saturated Wells-Dawson-type polyoxidoanions and TMCs, and the synthesis of the POM precursor, Na6[P2W18O62]·19H2O, see: Wang et al. (2010); Contant (1990).
Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell refinement: CrysAlis CCD; data reduction: CrysAlis RED (Oxford Diffraction, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008) and DIAMOND (Brandenburg, 2006); software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: SU2626 ).
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