title: Redetermination of 2,2'-bipyridine-1,1'-diium dibromide.
abstract: In the title mol-ecular salt, C(10)H(10)N(2) (2+)·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 R(2) (1)(7), R(4) (2)(10), R(4) (2)(11) and two different R(4) (2)(12) loops. This structure was originally reported by Nakatsu et al. [Acta Cryst (1972), A28, S24], but no atomic coordinates are available.
authors.affiliation: Department of Chemistry, Al al-Bayt University, Mafraq 25113,  Jordan.
authors.forename: Basem F
authors.initials: BF
authors.lastname: Ali
authors.forename: Rawhi
authors.initials: R
authors.lastname: Al-Far
authors.forename: Salim F
authors.initials: SF
authors.lastname: Haddad