Crystal structure and Hirshfeld surface analysis of ()-4-({2,2-di-chloro-1-[4-(di-methyl-amino)-phen-yl]ethenyl}diazen-yl)benzo-nitrile.

In the title compound, CHClN, the dihedral angle between the aromatic rings is 50.09 (9)°. The central -N=N- unit shows an configuration.

()-1-(2,6-Di-chloro-phen-yl)-2-(3-nitro-benzyl-idene)hydrazine: crystal structure and Hirshfeld surface analysis.

The stabilized conformation of the title compound, CHClNO, is similar to that of the isomeric compound ()-1-(2,6-di-chloro-phen-yl)-2-(2-nitro-benzyl-idene)hydrazine. The 2,6-di-chloro-phenyl ring and the nitro-substituted benzene ring form a dihedral angle of 26.25 (16)°.

Crystal structure and Hirshfeld surface analysis of ()-1-(2,6-di-chloro-phen-yl)-2-(2-nitro-benzyl-idene)hydrazine.

In the title compound, CHClNO, the 2,6-di-chloro-phenyl ring and the nitro-substituted benzene ring form a dihedral angle of 21.16 (14)°. In the crystal, face-to-face π-π stacking inter-actions occur along the axis direction between the centroids of the 2,6-di-chloro-phenyl ring and the nitro-substituted benzene ring.

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.