CuInOVO_4-Single Crystals of a Copper(II) Indium Oxide Vanadate by Oxidation of Cu/In/V Alloys

摘要

Red-brown crystals of the new compound CuInOVO_4 (monoclinc, P2_1/c, a = 879.3(2)) pm, b = 615.42(6) pm, c= 1526.2(2) pm, #beta# = 106.69(2) deg, Z = 4) were prepared by the reaction of Cu/In/V alloys with oxygen. The investigated crystals were twins by pseudo-merohedry with a (001) twinning plane. The structure contains isolated Cu_4O_(18)-groups consisting of trans edge sharing CuO_(6-) octahedra. Interconnection of the groups by _infinity~1[In_4O_(16)]-ribbons running along [010] which are built of edge- and corner-sharing InO_6-octahedra results in the formation of slabs perpendicular to the c-axis. The slabs are linked to a threedimensional framework by VO_4~(3-) groups. The structure may be derived from a cubic closest packing of the oxygen atoms with copper and indium atoms in the octahedral and vanadium atoms in the tetrahedral vacancies.