CHEMICAL PREPARATION, THERMAL-BEHAVIOR AND CRYSTAL-STRUCTURE OF CALCIUM-CESIUM CYCLOHEXAPHOSPHATE DIHYDRATE

Chemical preparation and crystal structure are given for a new monoval ent-divalent cation cyclohexaphosphate. This compound is monoclinic P2 (1)/c with the following unit cell parameters: a = 9.087(2), b = 12.24 6(4), c = 9.895(4) Angstrom, beta = 116.98(2)degrees, Z = 2, V = 981(1 ) Angstrom(3), and Dx = 2.897 g . cm(-3). The atomic arrangement can b e described as successive wide layers made by the P6O18 ring anions an d interconnected by the CaO6 and CsO8 polyhedra and the hydrogen bonds . Crystal structure was solved with a final R value of 0.032 for 6263 independent reflections. The thermal behavior has been investigated an d interpreted by comparison with IR absorption spectroscopy and X-ray diffraction experiments.