Redetermination of 2,2′-bipyridine-1,1′-diium dibromide

Abstract

In the title molecular salt, C10H10N22+.2Br-, the dihedral angle between the aromatic rings is 20.83 (14)° and the N - H groups have a transoid conformaton [N - C - C - N = 158.5 (3)°]. In the crystal, the cations are linked to the anions by two N - H·Br and five C - H·Br hydrogen bonds, generating corrugated sheets incorporating R21(7), R 24(10), R 24(11) and two different R 24(12) loops. This structure was originally reported by Nakatsu et al. [Acta Cryst (1972), A28, S24], but no atomic coordinates are available.