Crystal structure of ammonium divanadium(IV,V) tellurium(IV) heptaoxide

Abstract

The polyhedral building blocks of the layered inorganic network in the mixed-valence title compound, (NH4)(VIVO2)(VVO2)(TeO3), are vertex-sharing VVO4tetrahedra, distorted VIVO6octahedra and TeO3pyramids, which are linked by V—O—V and V—O—Te bonds, forming double layers lying parallel to (100). The presumed TeIVlone-pairs of electrons appear to be directed inwards into cavities in the double layers. The charge-balancing ammonium cations lie between the layers and probably interact with themviaN—H...O hydrogen bonds.