Spectral properties of naphthalimide dyes mixed with 4-heptyl-4′-cyanobiphenyl (7CB) in Langmuir-Blodgett films

Abstract

Langmuir-Blodgett (LB) films formed of some fluorescent dyes, namely derivatives of 4-aminonaphthalimide, and their binary mixtures with the liquid crystal 4-heptyl-4′-cyanobiphenyl (7CB) have been studied. The electronic absorption and fluorescence spectra were recorded. On the basis of these spectra, the spectral properties of the dyes and the intermolecular interactions in ultrathin ordered films were determined. The conclusions about the tendency to the creation of aggregates by dye molecules in LB films have been drawn. The measurements of absorption by using linearly polarised light have allowed us to determine the arrangement of the dye and liquid crystal molecules on the air-solid substrate interface.

Intermolecular Interactions in Organic Dye Monolayers Formed by Langmuir-Blodgett Technique

“…Because in the absorption spectrum such large band shift as in the fluorescence spectrum is not observed, it can be supposed that dyes AN1-AN6 in the LB films are able to create the excimers or their precursors, similarly as it was found for perylene-like dyes. The results of the recent study [23] seem to confirm this suggestion.…”

Intra- and Interlayer Energy Transfer in Planar Systems Based on Amphiphilic Naphthalimide Derivatives

“…Только единичные работы посвящены вопросам формирования организованных тонких пленок на основе производных нафталимида. [17][18][19] Причем в указанной группе публикаций для обеспечения возможности пере-носа пленок на твердые подложки авторы прибегают к помощи растекателей, придающих системе необходимые поверхностно-активные свойства. Использование для получения стабильных монослоев и пленок Ленгмюра-Блоджетт (ПЛБ) дифильных производных нафталимида с длинноцепочечными алкильными заместителями до настоящего времени в литературе не описано.…”