The cyclo-tetra­phosphate Cd2P4O12, a member of the isotypic series M 2P4O12 (M = Mg, Mn, Fe, Co, Ni, Cu)

摘要

The title compound, Cd2P4O12, dicadmium cyclo-tetra­phosphate, crystallizes isotypically with the members of the series M II 2P4O12, where M = Mg, Mn, Fe, Co, Ni or Cu. Two CdO6 octa­hedra, one with 2 and one with symmetry, share corners with the centrosymmetric P4O12 4− ring anion that is built up from four corner-sharing PO4 tetra­hedra. The isolated ring anions are arranged in layers parallel to (10) with the CdO6 octa­hedra situated between these layers. The main difference between the individual M II 2P4O12 structures pertains to the different sizes of the MO6 octa­hedra whereas the geometric parameters of all cyclo-P4O12 4− anions are very similar.