A B C
Z. Naturforsch. 2013, 68b, 611 – 615
doi:10.5560/ZNB.2013-3049
Novel Polyanionic Topologies in Ag2VAsO6 and Ag6V2As2O13
Jürgen Nuss, Jan Curda and Martin Jansen
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
Reprint requests to M. Jansen. Fax: +49 (0) 711 6891502. E-mail: m.jansen@fkf.mpg.de
Received February 14, 2013 / published online Juli 2, 2013
Dedicated to Professor Heinrich Nöth on the occasion of his 85 birthday
Two new silver vanadate arsenates, Ag2VAsO6 and Ag6V2As2O13, have been prepared applying high oxygen pressure syntheses in stainless-steel autoclaves. Ag2VAsO6 crystallizes in space group P1̅ with unit cell parameters a = 639.1(1), b = 646.1(1), c = 706.6(1) pm, α = 116.105(3), β = 91.759(4), γ =90.067(4)°, and Z = 2 (R1 = 0.058, 3935 independent reflections). The structure consists of AsO4 tetrahedra and VO6 octahedra which are linked to form two-dimensional 2[VAsO6]2− polyanions, separated by silver cations. Ag6V2As2O13 (C2/c, a = 1895.9(2), b = 536.40(6), c = 1308.5(2) pm, β =113.578(2)°, Z = 4; R1 = 0.030, 2571 independent reflections) displays as primary building units AsO4 tetrahedra and VO5 trigonal bipyramids which are condensed by sharing edges to one-dimensional 1[V2As2O13]6− ladder-like strands, set apart by the silver cations. These heteropolyanions are without precedent.
Key words: Silver, Vanadates, Arsenates, Crystal Structure, High Pressure Synthesis
Full-text PDF