PREPARATION AND CRYSTAL-STRUCTURE OF GUANIDINIUM CYCLODODECAPHOSPHATETELLURIC ACID HYDRATE - ]12P12O36-CENTER-DOT-12TE(OH)(6)CENTER-DOT-24H(2)O

The title compound ist the first example of an adduct between telluric acid and the twenty four membered ring anion of a cyclododecaphosphat e. [C(NH2)(3)]12P12O36 . 12Te(OH)(6) . 24H(2)O crystallizes trigonal ( rhomboedral: R3) with Z = 3 and the unit-cell dimensions a = 15.854(9) , c = 51.26(2) Angstrom in the hexagonal setting. The crystal structur e was solved by direct methods and refined to a final R value of 0.031 . It is characterized by a succession of three different typs of alter nating layers perpendicular to the c direction. This layers are connec ted only by hydrogen bonds. The individual layers are built up of A: P 12O36 anions, guanidinium cations and water of crystallisation, B: hex agonal arranged Te(OH)(6) groups and guanidinium cations and C: water of crystallization.