Abstract

Bismuth complex [Bu4N]2+[Bi2I8 · 2Me2S=O]2−(I) was synthesized by reacting tetrabutylammonium iodide with bismuth iodide. In the cations, an N atom has a distorted tetrahedral coordination (CNC angles change in the range from 107.9(5)° to 111.9(5)°). In the centrosymmetric binuclear anion, octahedral bismuth atoms are bound to each other through the bridging (br) iodine atoms (Bi-Ibr, 3.2779(7) A and 3.3156(9) A), which are coplanar with four terminal (t) iodine atoms (Bi-It, 2.9392(7) A and 2.9534(8) A). Two remaining positions near the bismuth atom are occupied by an iodine atom (Bi-I, 3.0079(8) dimethyl sulfoxide (DMSO) molecule (Bi-O, 2.456(5) A).

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