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), R42(10), R42(11) and two different R42(12) loops. This structure was originally reported by Nakatsu et al. [Acta Cryst (1972), A28, S24], but no atomic coordinates are available.