A cadmium vanadophosphate built up from rutile and HTB-TYPE ribbons: CdVO2(H2O)PO4

A new cadmium vanadophosphate, CdVO2(H2O)PO4 involving V(V), has been synth esized using hydrothermal technique. Its structure has been solved from a t winned crystal. It crystallizes in the space group P2(1) with a = 5.3086(8) , b = 7.1465(9), c = 7.6871(9) Angstrom, beta = 115.48(2)degrees. The frame work is simple and original: it consists of rutile ribbons [CdO4](infinity) and hexagonal tungsten bronze (HTB) ribbons [VO5](infinity) running along (b) over right arrow, and forming six-sided tunnels. The rutile and HTB rib bons share the apices of their CdO5(H2O) and VO5(H2O) octahedra forming [Cd VO6(H2O)](infinity) layers parallel to b, c and interconnected through PO4 tetrahedra. The presence of H2O in this framework, in the form of rather st rong V-H2O-Cd bonds, explains the great stability of this phosphate, which decomposes only above 300 degrees C. (C) 2000 Editions scientifiques et med icales Elsevier SAS. All rights reserved.