NEW ALKALI CHALCOGENOSTANNATES(IV) WITH ISOLATED ZINTL ANIONS: Ferdinand Fabian & Kurt O. Klepp, Dept. of Inorg. Chemistry, Kepler University, Altenbergerstr. 69, A-4040 Linz, Austria

A number of new alkali chalcogenostannates were synthesized by high temperature methods and structurally characterized from CAD4-data obtained with MoK[[alpha]]-radiation. Their common structural feature is the formation of discrete anionic groups with Sn(IV) in tetrahedral chalcogen coordination. Apart from mononuclear species, binuclear, Sn₂Se₆^4-, and trinuclear, Sn₃Se₈^4- , anions are formed by condensation via common tetrahedral edges. Cs₈Sn₂Te₉ contains two different anionic species, SnTe₄^4- and SnTe₅^4-, in the latter an end on coordinated ditelluride group acts as a ligand on the central atom. A detailed discussion of the crystal structures is to be given on the meeting.

This study was supported by the Austrian National Science Foundation under project nr. P09981