Tl2Sn2S5, ein Thallium(I)thiostannat(IV) mit fünffach koordiniertem Zinn / Tl2Sn2S5, a Thallium(I) Thiostannate(IV) with Fivefold Coordinated Tin

Abstract

Abstract The new compound Tl2Sn2S5 was prepared by fusion of a stoichiometric mixture of the elements followed by prolonged heating at 300 °C. The compound crystallizes in the monoclinic system in space group C2/c with lattice constants a - 11.115(2), 6 = 7.723(1), c = 11.492(2) Å, and β = 108.60(1)° (Z = 4). The Sn atoms are coordinated by five S atoms forming a considerably distorted trigonal bipyramid (mean distance Sn-S: 2.497 Å). By common edges the SnS5 bipyramids are linked into chains extending in the [110] and [11̄̄0] directions, respectively. The chains are cross-linked by sharing the remaining equatorial vertices of the SnSs bipyramids, thus forming a three-dimensional framework which is related to that described for Na4Sn3S8 [1]. The Tl atoms located in channels running parallel to the b axis are surrounded by nine S atoms. The distances Tl-S vary from 3.073 to 3.897 Å.