Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.294, 177-180, 1997
An Infrared Study on Molecular-Orientation in Mixed-Stack Charge-Transfer Films of 2-Octadecyl-7,7,8,8-Tetracyanoquinodimethane and 3,3’,5,5’-Tetramethylbenzidine Prepared by the Langmuir-Blodgett Technique and Donor Doping
Molecular orientation in mixed-stack charge transfer (CT) films of 2-octadecyl-7,7,8,8-tetracyanoquinodimethane (acceptor, A) doped with 3,3’,5,5’-tetramethylbenzidine (donor, D) has been investigated by infrared (IR) transmission and reflection absorption (RA) spectroscopy. A comparison of relative intensities of IR bands originated from chromophores of D and A reveals that the long axes of both D and A are almost parallel to the substrate in a one-layer CT film. A layer dependence of the molecular orientation has been explored by a comparison of IR transmission and RA spectra of multilayer mixed-stack CT films.