Self-assembly and photoisomerization of azobenzenealkanethiol derivatives on gold films: Infrared reflection absorption studies

T. Sato, K. Tsuji, E. Kokuryu, T. Wadayama, A. Hatta

Research output: Contribution to journalReview articlepeer-review

3 Citations (Scopus)

Abstract

Self-assembly and photoisomerization of 4-(4′-(phenylazo) phenoxy) undecane-1-thiol and its fluoro- and methoxy-phenylazo derivatives on evaporated gold films have been characterized by infrared reflection absorption spectrascopy. The infrared measurements as a function of self-assembling time show that their self-assembling proceeds through Langmuir adsorption with a settlement in alignment of the azobenzene moiety and the aliphatic long chain. Moreover, photoisomerizations of these compound's from trans to cis and vice versa are very limited in their close-packed monolayer films in contrast to the molecules in solution. However, such restrictions are somewhat relaxed for a self-assembly film of the cis-form methoxy-phenylazo derivative. This effect of preferential cis-form assembling is also demonstrated by the changes in the alignment of 4-cyano-4′-pentylbiphenyl (5CB) nematic liquid crystalline molecules caused by conformational changes of the underlying self-assembled molecules.

Original languageEnglish
Pages (from-to)13-39
Number of pages27
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume391
DOIs
Publication statusPublished - 2002

Keywords

  • Infrared spectroscopy
  • Liquid crystal
  • Molecular alignment
  • Photoisomerization
  • Self-assembly

ASJC Scopus subject areas

  • Condensed Matter Physics

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