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

摘要

A monoazo dye,4-[(2-methoxy-4-nitro-phenylazo)-phenyl]-dimethyl-amine (C_(15)H_(16)N_4O_3) 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 = 7301(4) b = 13.854(7),c = 14.575(7) A,alpha = 90.842(9) deg,beta = 90.334(9) deg,gamma = 91.935(8) deg,V= 1473.2(13) A~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 deg and - 175.83 deg,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 pi...pi interaction (1 - x,1 - y,1 - z),and interacted through C-H...O hydrogen bond and C-H...pi interaction forming 'double chains' along [010].The 'double chains' are interacted through C-H...O,C-H...N hydrogen bonds and C-H...pi interaction forming double layers along [110],which are in turn interacted by C-H...O,C-H...N hydrogen bonds and C-H...pi interaction along [101] forming crystals.