Solvatochromism of a merocyanine derivative in a self-assembled monolayer on gold substrates

Katsuhiko Fujita, Masahiko Hara, Hiroyuki Sasabe, Wolfgang Knoll, Kazuma Tsuboi, Kotaro Kajikawa, Kazuhiko Seki, Yukio Ouchi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The merocyanine, 1-alkyl-4-(4-hydroxystyryl)pyridinium halide, shows solvatochromism depending on environmental condition such as pH and polarity of the solvent. We synthesized the merocyanine derivative with a disulfide group tethering it on metal surfaces to form a self-assembled monolayer. The adsorption process of the merocyanine derivative was monitored by in situ surface plasmon spectroscopy (SPS). The SPS and X-ray photoelectron spectroscopy independently indicated that the monolayer was densely packed on a gold substrate. To investigate the solvatochromism following the exposures to organic solutions we applied reflection spectroscopy in the UV - vis region. For more detailed discussions on the reflection spectra, theoretical calculations were carried out on the basis of Fresnel formulas. The results indicated that the merocyanine group shows solvatochromism even in the densely packed layer.

Original languageEnglish
Pages (from-to)7456-7462
Number of pages7
JournalLangmuir
Volume14
Issue number26
DOIs
Publication statusPublished - Dec 22 1998

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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