Crystal structure and Hirshfeld surface analysis of ()-2-(4-bromo-phen-yl)-1-[2,2-di-bromo-1-(4-nitro-phen-yl)ethen-yl]diazene.

The mol-ecule of the title compound, CHBrNO, consists of three almost planar groups: the central di-bromo-ethenyldiazene fragment and two attached aromatic rings. The mean planes of these rings form dihedral angles with the plane of the central fragment of 26.35 (15) and 72.

Crystal structures and Hirshfeld surface analyses of the two isotypic compounds ()-1-(4-bromo-phen-yl)-2-[2,2-di-chloro-1-(4-nitro-phen-yl)ethen-yl]diazene and ()-1-(4-chloro-phen-yl)-2-[2,2-di-chloro-1-(4-nitro-phen-yl)ethen-yl]diazene.

In the two isotypic title compounds, CHBrClNO, (), and CHClNO, (), the substitution of one of the phenyl rings is different [Br for () and Cl for ()]. Aromatic rings form dihedral angles of 60.9 (2) and 64.