STRUCTURAL STUDIES ON LANGMUIR-BLODGETT-FILMS CONTAINING NITROSTILBENE AND HEMICYANINE DYES

Infrared spectroscopic studies on amidonitrostilbene and hemicyanine dye Langmuir-Blodgett layers (in multilayer and bilayer configurations) were performed to provide information about the molecular interactions responsible for enhanced nonlinear optical properties. In particular, hydrogen bonding at the carbonyl groups (and other head group interactions) provides a means of aligning and partially separating the hemicyanine molecules in the bilayer configuration. Attempts have been made to assess the degree and nature of microscopic ordering as the number of monolayers increases. These data are assessed in the light of RHEED and ellipsometric measurements, and possible sources of discrepancy are discussed. © 1990, American Chemical Society. All rights reserved.