Ethylenediammonium sodium tetrakis[bis(ethylenediamine-κ2N,N′)(oxalato-κ2O1,O2)cobalt(III)] [pentahydrogen di(phosphatooctadecatungstate)] tetradecahydrate

Abstract

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—H...O and O—H...O hydrogen bonds, which together with C—H...O 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.