Thallium(III) selenite, Tl2(SeO3)3.
The structure of Tl2(SeO3)3 [dithallium(III) triselenium(IV) nonaoxide] is monoclinic (P21/n symmetry), with all atoms in general positions. It is built up from TlO6 octahedra, distorted TlO7 pentagonal bipyramids and (SeO3)2- pyramids sharing vertices and edges to form corrugated (001) layers. The Se lone pairs of electrons are accommodated in the interlayer regions.
Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen, AB24 3UE, Scotland.
William T A
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Harrison