CHEMICAL PREPARATION, STRUCTURAL INVESTIGATION, AND THERMAL-BEHAVIOR OF A NEW CYCLOHEXAPHOSPHATE - ZN2CS2P6O18.8H2O

We describe the chemical preparation and crystal structure of zinc-ces ium cyclohexaphosphate octahydrate: Zn2Cs2P6O18 . 8H2O. This new compo und is monoclinic, P2(1), with the dimolecular unit cell a = 11.895(9) , b = 12.663(7), c = 8.079(8) angstrom, beta = 94.33(7)-degrees. This new type of noncentric atomic arrangement has a typical layer organiza tion, built by corrugated layers of comer sharing ZnO6 and P6O18 entit ies, spreading perpendicular to the c direction. Cesium atoms are loca ted in channels created by this network. One of the water molecules do es not take part in the associated cation coordination polyhedra. The atomic arrangement was determined with a final R value of 0.035 for 45 83 independent reflections. The thermal behavior has been investigated and interpreted by comparison with IR absorption spectroscopy, DTA, a nd DTG experiments. (C) 1994 Academic Press, Inc.