Synthesis and crystal structure of (p-CH3C6H4NH3)(6)P6O18 center dot 8H(2)O

Preparation and complete structural characterization by X-ray diffraction ( XRD), IR absorption, thermogravimetric and differential thermal analysis (T G-DTA), and mass angle spinning (MAS) NMR spectroscopy are given for a new cyclohexaphosphate, (p-CH3C6H4NH3)(6)P6O18. 8H(2)O. This compound is monocl inic in space group P2(1)/c, with Z = 2 and unit-cell parameters a = 10.695 (6), b = 24.952(8), c = 11.163(4) Angstrom, and beta = 97.53(4)degrees. The crystal structure was solved and refined down to R = 0.036, using 4168 ind ependent reflections. The atomic arrangement can be described as layer orga nization. Layers built by P6O18 ring anions and water molecules spread para llel to the plane (010). Between these layers are located the organic group s that form hydrogen bonds with P6O18 ring oxygens. Geometrical characteris tics of the hydrogen bonds are described. (C) 1999 Elsevier Science Ltd.