KVTeO5 and a redetermination of the Na homologue

A single crystal of KVTeO(5), potassium vanadium tellurite, has been grown. The present structure determination has been conducted together with the refinement of the NaVTeO(5) homologue, sodium vanadium tellurite, for the sake of precise comparison. The network consists of [VTeO(5)](n) ribbons built up by VO(4) tetrahedra linking centrosymmetric Te(2)O(6) groups and stacked along the [010] direction; the alkali cations are intercalated in between. The Te(IV) atom exhibits a typical one-sided coordination number (CN) of 4, completed by a lone pair, which forms a distorted triangular bipyramid with the four O atoms.