Structural studies of group 5B–halide–dithio-ligand complexes. Part 4. Crystal structures of bis(tetraethylammonium) di-µ-iodo-bis[(NN-diethyldithiocarbamato)di-iodobismuthate(III)] and a partially brominated analogue

Abstract

Crystallization of 1 : 1 stoicheiometric dimethylformamide solutions of [Bi(S₂CNEt₂)I₂] and [NEt₄]I yields a complex of stoicheiometry [NEt₄][Bi(S₂CNEt₂)I₃]. Single-crystal X-ray diffraction studies show it to be [NEt₄]₂[I₂(Et₂NCS₂)BiI₂Bi(S₂CNEt₂)I₂], with a centrosymmetric anion containing iodine bridges. Use of [NEt₄]Br instead, yields the isostructural monobromide; its structure has also been determined and the bromine found to occupy one of the non-bridging co-ordination positions about the bismuth atom. The unit cell is triclinic, with a ca. 13.0, b ca. 10.7, c ca. 9.6 Å, α ca. 68, βca. 79, and γ ca. 75°.