Structural characterization of a series of cyclohexaphosphates: M-0.5((C6H5CH2)(2)NH2)(5)P6O18 center dot H2O (M = Co, Cu, Cd)

Three new cyclohexaphosphates with general formula M-0.5((C6H5CH2)(2)NH2)(5 )P6O18. H2O (M = Co, Cu, Cd) are reported. They crystallize with monoclinic unit-cells and are isotropic. We have determined their structure from the salt M = Co. This later exhibits the following unit-cell parameters: a = 22 .739(5), b = 17.682(3), c = 18.342(3) Angstrom, beta = 91.22(1)degrees, Z = 4, P2(1)/n, V = 7373 Angstrom(3), and Dx = 1.373 g cm(-3). The atomic arra ngement can be described as layers containing P6O18 ring anions and CoO6 oc tahedra spreading in the (101) planes and intercalated by the dibenzylammon ium groups and the water molecules. Synthesis and characterization by X-ray diffraction, IR absorption, and TA are described.