Synthesis and Structure of [Sn4Se11]6–, [Sn2Se52–], and [Sn3Se72–] – Model Anions for the Solventothermal Reaction Pathway to Lamellar Selenidostannates(IV) |
| |
Authors: | Anja Loose William S. Sheldrick |
| |
Abstract: | Reaction of A2CO3 (A = K, Rb) with Sn and Se in an H2O/CH3OH mixture at 115–130°C affords the isotypic selenidostannates(IV) A6Sn4Se11 _. xH2O (A = K, x = 8) 1 and 2 whose discrete [Sn4Se11]6– anions each contain two corner‐bridged ditetrahedral [Sn2Se6]4– species. Similar reaction conditions with A = Cs afford Cs2Sn2Se5 _. H2O ( 3a ) and Cs2Sn2Se5 ( 3b ) in which such [Sn2Se6]4– building blocks are connected through common Se atoms into infinite [Sn2Se52–] chains. The [Sn3Se72–] ribbons of (Et4N)2Sn3Se7 ( 4 ), formed by treating (Et4N)I with Sn and Se in methanol at 130°C, can be regarded as resulting from the condensation of [Sn2Se52–] chains with molecular [SnSe4]4– anions. The anions [Sn4Se11]6–, [Sn2Se52–], and [Sn3Se72–] represent the products of individual reaction steps on the potential condensation pathway of [Sn2Se6]4– to the lamellar selenidostannates(IV) [Sn4Se92–] or [Sn3Se72–]. |
| |
Keywords: | Selenium Tin Selenidostannates Crystal Structure |
|
|