A new mixed molybdenum–vanadium polyoxometalate double-supporting transition metal complex: {[Co(phen)2]2-C2O4} {H2P O44[Co(phen)2(H2O)]2}·7H2O

The new polyoxometalate double-supporting transition metal complexes, {[Co(phen)2]2C2O4} {H2P O44[Co(phen)2H2O]2}·7H2O (1) (phen = 1,10-phenanthroline) have been hydrothermally synthesized and characterized by single crystal X-ray analysis, IR, XPS, ESR and elemental analysis. Compound 1 is composed of a highly reduced tetra-capped pseudo-Keggin polyoxoanion supporting two transition metal complexes, a binuclear cobalt complex cation and lattice water. The magnetism and third-order non-linear optical properties of 1 have also been studied.