The crystal structure of 4-[(2-methoxy-4-nitro-phenylazo)-phenyl]-dimethyl-amine

A monoazo dye, 4-[(2-methoxy-4-nitro-phenylazo)-phenyl]-dimethyl-amine (C15H16N4O3) was synthesized and characterized by X-ray diffraction, IR. H-1 NMR, and elemental analysis. The title molecule crystallizes in the triclinic system, space group P-1 (#2), a = 7.301(4), b = 13.854(7). c = 14.575(7) angstrom, alpha = 90.842(9)degrees, beta = 90.334(9)degrees, gamma = 91.935(8)degrees, V = 1473.2(13) angstrom(3), Z = 4. There are two independent molecules in the asymmetric unit. They have trans-geometry about the azo linkage and the torsion angles of central -C-N=N-C- are 175.74 degrees and -175.83 degrees. respectively. The two molecules are interacted through C-(HO)-O-... and C-(HN)-N-... hydrogen bond. These pairs of molecules are arranged anti-parallel through pi(...)pi interaction (1 - x, 1 - y, 1 - z), and interacted through C-(HO)-O-... hydrogen bond and C-H-...pi interaction forming 'double chains' along [010]. The 'double chains' are interacted through C-(HO)-O-..., C-(HN)-N-... hydrogen bonds and C-H-...pi interaction forming double layers along [110], which are in turn interacted by C-(HO)-O-..., C-(HN)-N-... hydrogen bonds and C-H-...pi interaction along [101] forming crystals. (c) 2006 Elsevier Ltd. All rights reserved.