STRUCTURAL-ANALYSIS OF SOME BENZOXAZOLES CONTAINING STRONG ELECTRON DONOR-ACCEPTOR GROUPS

The crystal structure analysis of two benzoxazole containing molecules is reported: 2-[4-N,N-bis(2-hydroxyethyl)] phenyl-6-nitrobenzoxazole monohydrate (1) and 2-[4-N-(6-hydroxyhexyl)-N-methyl] phenyl-6-nitrobe nzoxazole (2). These compounds are monomer precursors of polymers with nonlinear optical properties of the second order, The crystal structu res have been determined at room temperature by direct methods and ref ined by full-matrix least-squares method. Some differences have been f ound in the molecular geometry of 1 and 2 as compared to published dat a on similar benzoxazole containing compounds. These differences are d ue to the strong electron donor effect of the amino group and indicate enhanced conjugation in the molecules. The pattern of hydrogen bondin g in the two compounds is also discussed.