An unprecedented μ4-Sn2Se9ligand: solvothermal syntheses and characterizations of novel lanthanum selenidostannates [{La(dien)2}4(μ4-Sn2Se9)(μ-Sn2Se6)]∞ and [La2(en)8(μ-Se2)]Sn2Se6

Abstract

Solvothermal reaction of La₂O₃, Sn and Se in dien yields a novel lanthanide selenidostannate [{La(dien)₂}₄(μ₄-Sn₂Se₉)(μ-Sn₂Se₆)]_∞, the first example of the coordination of Sn₂Se₉ and Sn₂Se₆ ligands to hard Lewis acidic lanthanide metals, while the reaction in en yields an ionic compound [La₂(en)₈(μ-Se₂)]Sn₂Se₆ containing a ten-coordinated binuclear lanthanum complex [La₂(en)₈(Se₂)]⁴⁺ with the diselenide Se₂²⁻group as a bridging ligand.