title: 4,4',6,6'-Tetra-bromo-2,2'-(2,8-diazonia-5-azanona-1,8-diene-1,9-diyl)diphenolate.
abstract: In the zwitterionic title compound, C(18)H(17)Br(4)N(3)O(2), the two salicylaldimine groups form a dihedral angle of 51.94 (2)° and the dihedral angle between the aromatic ring planes is 51.14 (2)°. One of the C atoms adjacent to the aza N atom is disordered over two positions; the site-occupancy factors are 0.51 (1) and 0.49 (1). There are two strong intra-molecular N-H⋯O hydrogen bonds in the mol-ecule.
authors.forename: Zhu-Jun
authors.initials: ZJ
authors.lastname: Chen
authors.forename: Ke-Wei
authors.initials: KW
authors.lastname: Lei