A novel hydrogen-bonded complex formed by reaction between bromine and 1,4-diazabicyclo[2.2.2]octane in dichloromethane solution

Abstract

The reaction between bromine and 1,4-diazabicyclo[2.2.2]octane (DABCO) in dichloromethane solution produces a novel complex consisting of a linear chain of three hydrogen-bonded DABCO units terminated at each end by a Br₃·Br₃·Br counterion apparently bearing a total formal charge of 3-; these chains are cross-linked by hydrogen bonds to a fourth diprotonated DABCO unit, and the whole structure is characterised by a number of unusually close interatomic contacts.