STRUCTURE OF 1-ETHYL-2-(2'-CHLORO-4'-NITROSTYRYL)BENZIMIDAZOLE

The title compound C17H14ClN3O2 (et-4-nsbiz) is monoclinic, with a = 1 2.240(2), b = 12.144(4), c = 10.544(4) angstrom, beta = 100.09(2)-degr ees, V = 1543(1) angstrom3, Z = 4, D(x) = 1.411 g cm-3, lambda(MoKalph a) = 0.71073 angstrom, mu = 2.57 cm-1, F(000) = 680, M(r) = 327.77, T = 298K. The structure was solved by heavy atom and Fourier methods and refined to R = 0.049 for 1503 unique observed reflections in space gr oup P2(1)/c. Except for the ethyl group, the molecule is almost planar , with a dihedral angle of 9.5(5)-degrees between the benzimidazole an d phenyl rings. The dihedral angle between the ethyl group and the ben zimidazole ring to which it is attached is 91.5(2)-degrees.