SYNTHESIS AND CRYSTAL-STRUCTURE OF COBALT(II)-HEXAOXODIPHOSPHATE(P-P)(4-)-DODECAHYDRATE, CO2P2O6-CENTER-DOT-12H2O

Co2P2O6.12H(2)O was obtained by cleavage and simultaneous oxidation of cyclo-hexaphosphate(III) in a solution of ethanol and aqueous ammonia. The crystal structure has been determined (1898 independent diffractometer data): space group Pbam (No. 55), a = 6.710(2), b = 12.196(2), c = 10.073(3) Angstrom, V = 825.3(1) Angstrom(3), Z = 2, R = 0.060. The P2O64- anions show site symmetry C-2h and are connected to form chains via cobalt. Two cobalt ions together with two sets of four water molecules and two oxygen atoms of P2O64- form pairs of edge connected octahedra. The common edges are formed by the oxygen atoms of the P2O6 groups.