K. Balasubramanian, V. Cammarata, Q. Wu
May 1, 1995
Citations
0
Influential Citations
10
Citations
Journal
Langmuir
Abstract
Nine new 4,4'-bis(4-substituted-styryl)-2,2'-bipyridines were synthesized and characterized. These new materials and 4,4'-bis(4-methylstyryl)-2,2'-bipyridine were applied to the subphase of a Langmuir trough. Eight of the ten compounds (R = CN, COOCH 3 , N(CH 3 ) 2 , COOH, OCOCH 3 , NO 2 , OCH 3 , CH 3 ) made stable Langmuir films. These films were transferred by horizontal lifting to a variety of solid surfaces with transfer ratios close to unity. The transferred films were analyzed by transmission UV-vis, transmission IR, grazing angle relectance IR, and polarized attenuated total reflectance IR spectroscopies. Of the eight materials, two, 4,4'-bis(4-acetylstyryl)-2,2'-bipyridine and 4,4'-bis(4-methylstyryl)-2,2'-bipyridine, produce stable, highly anisotropic films. The other compounds form films with varying anisotropy from moderately anisotropic to totally isotropic. Thus, functional groups can have a profound influence on the ability of these materials to form stable LS films and direct the net material orientation within the films