Trans-cis isomerization of crown ether-substituted azobenzene amphiphiles in Langmuir-Blodgett membranes

Junichi Anzai, Shin ichi Sakasegawa, Tetsuji Takemura, Tetsuo Osa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The photochemical and thermal isomerization of crown ether-substituted azobenzene amphiphiles were studied in Langmuir-Blodgett (LB) membrane and in solution. The photoisomerization of the azobenzene amphiphiles from trans to cis form tended to be suppressed in LB membrane as compared with those in solution. The cis-trans ratio at the photostationary state under UV light irradiation depended strongly on the chemical structure of the amphiphiles. The trans-cis isomerization was not fully reversible in the LB membranes because the azobenzene amphiphiles are highly densely packed. However, the isomerization reaction was fully reversible in the case of relatively loosely-packed LB membranes. In both membranes, the thermal isomerization from cis to trans form followed first-order kinetics.

Original languageEnglish
Pages (from-to)107-112
Number of pages6
JournalMaterials Science and Engineering C
Volume2
Issue number1-2
DOIs
Publication statusPublished - 1994 Jan 1

Keywords

  • Azobenzene
  • Crown ether amphiphiles
  • Langmuir-Blodgett membranes
  • Trans-cis isomerization

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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