Synthesis, structural characterization, and spectroscopic studies of bis-tetraethylammonium hexabromostannate [N(C2H5)4]2SnBr6

Abstract

The structure of the new organic–inorganic hybrid compound (TEA)2SnBr6 (TEA+ = tetraethylammonium cation, [N(C2H5)4]+), synthesized by slow solvent evaporation at room temperature, has been determined by single-crystal X-ray diffraction analysis. At room temperature, it crystallizes in the trigonal-centrosymmetric space group R-3c (167) with parameters a = b = 10.7912(2) Å and c = 42.5740(11) Å, as expressed in the corresponding hexagonal cell. The structure of (TEA)2SnBr6 is built up of isolated SnBr6 octahedra (0D) arranged in a quasi-face-centered system (F).The Raman spectrum of (TEA)2SnBr6 has been acquired at room temperature in the wavenumber range 10–3600 cm−1. The results have been analyzed on the basis of group theory (predictions based on space group and compatibility relationships from free SnBr62− and TEA+ entities), comparison with studies of [N(CH3)4]2SnBr6, and ab initio calculations on TEA+, and are consistent with the structure.