CHEMICAL PREPARATION, THERMAL-BEHAVIOR AND CRYSTAL-STRUCTURE OF CADMIUM-POTASSIUM CYCLOHEXAPHOSPHATE OCTAHYDRATE

Chemical preparation and crystal structure are given for a new monoval ent-divalent cation cyclohexaphosphate, Cd2K2P6O18.8H(2)O. This compou nd is triclinic P (1) over bar with the following unit cell parameters : a = 7.403(2), b = 11.403(5), c = 14.113(4)Angstrom, alpha = 97.60(2) , beta = 91.07(2), gamma = 82.01(2)degrees, Z = 2, V = 1169(1) Angstro m(3) and Dx = 2.618 g.cm(-3). In its atomic arrangement, layers built by CdO6 octahedra and P6O18 ring anions spread in planes (10 (1) over bar). Between these layers are located other CdO6 octahedra, polyhedra KO7 and KO9, and water molecules. Crystal structure was solved with a final R value of 0.023 for 6405 independent reflections. The thermal behavior has been investigated and interpreted by comparison with IR a bsorption spectroscopy and X-ray diffraction experiments.