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, 1H 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) Å, α = 90.842(9)°, β = 90.334(9)°, γ = 91.935(8)°, V = 1473.2(13) Å3, 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–NN–C– are 175.74° and −175.83°, respectively. The two molecules are interacted through C–H⋯O and C–H⋯N hydrogen bond. These pairs of molecules are arranged anti-parallel through π⋯π interaction (1 − x, 1 − y, 1 − z), and interacted through C–H⋯O hydrogen bond and C–H⋯π interaction forming ‘double chains’ along [010]. The ‘double chains’ are interacted through C–H⋯O, C–H⋯N hydrogen bonds and C–H⋯π interaction forming double layers along [110], which are in turn interacted by C–H⋯O, C–H⋯N hydrogen bonds and C–H⋯π interaction along [101] forming crystals.