SYNTHESIS, STRUCTURE, AND PROPERTIES OF BAVO2(ASO4) - A NEW VANADIUM ARSENATE CONTAINING THE V2O42+ CORE

The new vanadium arsenate BaAsVO6 has been synthesized hydrothermally and structurally characterized by single-crystal X-ray diffraction, IR spectroscopy, and magnetic susceptibility measurements. It crystalliz es in the monoclinic system, space group P2(1)/c with unit cell parame ters a = 5.645(1) Angstrom, b = 10.243(1) Angstrom, c = 8.945(1) Angst rom, beta = 90.60(1)degrees, and Z = 2; The layered structure is built up from V2O42+ units and AsO43- anions, the AsO43- ligands being coor dinated to two (V2O4)(2+) units in both, terminal and bridging mu(2)-A sO43- fashion. The [VO2(AsO4)](2-) layers are separated by Ba2+ cation s. The V2O42+ unit has no precedence in oxo-vanadium chemistry.