Solventothermal Synthesis of the Lamellar Selenidostannates(IV) A2Sn4Se9 · H2O (A = Rb, Cs) and Cs2Sn2Se6

Abstract

Abstract Reaction of A2CO3 with Sn and Se in an H2O/CH3OH mixture at 115 - 130°C affords the isotypic lamellar selenidostannates A2Sn4Se9-H2O 1 (A = Rb) and 2 (A = Cs). The polyanions 2 ∞[Sn4Se9 2-] exhibit Sn4Se5 es molecular building units, in which two adjacent Sn(IV) atoms of an Sn4Se4 8-membered ring are bridged by an additional Se atom. These units connect through (SnSe)2 4-membered rings to afford a 44 anionic net with 16-membered cavities. Cs2Sn2Se6 (3) may be prepared by methanolothermal reaction of Cs2CO3 with SnSe and Se at 130°C and contains porous 2 ∞[SnTSe2- ] sheets in which 1 ∞[SnSe3 2- ] ribbons are linked through Se-Se bonds. The resulting 44 net displays 14-membered pores in which the Cs cations reside.