Studies of thermally stimulated reversible restructuring and variation of the optical parameters of molecular layers of polymethine dyes

摘要

This paper discusses the thermally Stimulated restructuring of the molecular components of layers of symmetric polymethine dicarbocyanine dyes. Heating the layer to a temperature above 100 degrees C causes a partially reversible conversion of the dimers into monomeric stereoisomers (the all-trans isomer and the beta-cis isomer) and into J aggregates, as well as restructuring the beta-cis isomer into the all-trans isomer. The restructuring time is tens of minutes. The rate of such conversions depends on the components present in the layer, the structure of the heterocyclic end groups of the monomeric molecules, and the temperature. (C) 2008 Optical Society America.