Solvothermal Syntheses and Characterizations of Selenidostannate Salts of Transition Metal Complex Cations: Conformational Flexibility of the Lamellar [Sn3Se72–]n Anion

Abstract

AbstractThe selenidostannates [Mn(dien)2]Sn3Se7·0.5H2O (1), [Fe(tatda)]Sn3Se7 (2), and [Mn(dien)2]2Sn2Se6 (3) (dien = diethylenetriamine, tatda = 3, 6,9, 12‐tetraazatetradecane‐1, 14‐diamine) were prepared under solvothermal conditions. In compounds 1 and 2, the six Sn3Se4 semi‐cubes are bridged by double μ2‐Se atoms to form the [Sn3Se72–]n lamellar anion containing a elliptical 24‐membered Sn12Se12 ring, which show conformational flexibility of the 2D [Sn3Se72–]n anion influenced by the counter cation. The [Mn(dien)2]2+ complex ion in 1 is in mer configuration. The [Fe(tatda)]2+ complex ion possesses similar configuration to the [Mn(dien)2]2+ ion in 1. The [Mn(dien)2]2+ and [Fe(tatda)]2+ cations are located between the [Sn3Se72–]n layers. Compound 3 consists of dimeric [Sn2Se6]4– anions and octahedral [Mn(dien)2]2+ complex cations with u‐fac configuration. Compounds 1–3 have potential for uses as semiconductors with bandgaps in the range of 1.89–2.34 eV.