Effect of end substitution on optical properties and molecular orientationof distyrylbenzene derivatives in thin film

Three distyrylbenzene (DSB) derivatives were vacuum-evaporated on a (001) s urface of KBr. DSB derivative molecules formed nuclei by interaction betwee n the electron donative methoxyl group and Br- ion of the substrate crystal and oriented their longitudinal axis obliquely to the substrate surface. T he peak shift between the emission peaks of solution and film decreased dep ending on the number of substituent. This phenomenon was originated to redu ction of molecular interaction between neighboring molecules by steric hind rance of end substituents. (C) 2000 Elsevier Science S.A. All rights reserv ed.