A Bromine Adduct of 2,3,6,7,14,15-Hexamethyl-9,10-distibatriptycene. The First Stibonium–Stiborate Zwitterion

Abstract
2,3,6,7,14,15-Hexamethyl-9,10-distibatriptycene (3) reacted with bromine to give an adduct 4 with the composition of 3·2Br2. X-ray structure analysis and 1H NMR studies revealed that the bromine adduct 4 forms an intramolecular salt composed of a tetracoordinate bromostibonium ion moiety, R3SbBr+, and a hexacoordinate tribromostiborate ion moiety, R3SbBr3, both in the crystalline state and in solution.

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