Hydrothermal synthesis and crystal structure of a new copper(II) molybdenum(VI) arsenate(III), (C5H5NH)(2)(H3O)(2)[(CuO6)Mo6O18(As3O3)(2)]

A new copper(II) molybdenum(VI) arsenate(III), (C5H5NH)(2)(H3O)(2)[(CuO6)Mo 6O18(As3O3)(2)], has been hydrothermally synthesized and characterized by s ingle crystal X-ray diffraction and TG analysis. The compound crystallizes in the monoclinic space group P2(1)/n with a = 9.303(2), b = 20.731(4), c = 12.617(3) Angstrom, beta = 104.17(3)degrees V = 2359.3(8) Angstrom(3), Z = 2 and R1(wR2) = 0.0296(0.0683). The structure is composed of pyridinium ca tions, proton hydrates and [(CuO6)Mo6O18(As3O3)(2)](4-) polyanions. The pol yanion framework derives from the Anderson type; the central octahedron is filled up by copper(II) and is capped on both sides by a cyclic As3O6 group . (C) 1999 Elsevier Science S.A. All rights reserved.