Isotypic crystal structures of 2,6-dibromo-N,N-bis(4-nitrophenyl)aniline and 2,6-dichloro-N,N-bis(4-nitrophenyl)aniline

Abstract

In the molecules of the two isotypic title compounds, C18H11Br2N3O4 (I) and C18H11Cl2N3O4 (II), the triphenylamine N atoms show no sign of pyramidalization, with marginal displacements of the N atoms from the mean plane of the three connecting C atoms: 0.0058 (13) Å for the Br compound (I) and 0.0074 (9) Å for the Cl compound (II). In the crystals, molecules are linked through C—H...O hydrogen bonds between phenyl rings and nitro groups and by X...O (X = Br, Cl) interactions, that are shorter than the sum of the van der Waals radii, leading to a three-dimensional network.

Keywords

• crystal structure
• arylamines
• isotypism