Electron spin resonance in Langmuir-Blodgett films of a merocyanine dye and its isotope-substituted analogs

Shin ichi Kuroda, Keiichi Ikegami, Yuka Tabe, Kazuhiro Saito, Mitsuyoshi Saito, Michio Sugi, Shigeo Yasui

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Stable radical species existing in mixed Langmuir-Blodgett films of a merocyanine dye and arachidic acid are studied through their hyperfine couplings using the isotope substitution technique. One of the species shows a nitrogen hyperfine structure possibly arising from one of the two nitrogen sites in the molecule. With the employment of two dye analogs in which either one of the 14N nuclei is replaced by 15N, the observed nitrogen site has been identified to be the one in benzothiazole. That is, the wave function of the radical is directly associated with the dye chromophore. The photo-induced spectra have shown a similar change as the dark spectra upon 15N-substitution, indicating that the dark and photo-induced signals arise from a common species. These facts together with the recently observed correlation between the anisotropic behaviour of ESR and optical J-band strongly suggest an intermolecular charge transfer in J-aggregates as the origin of radical generation.

Original languageEnglish
Pages (from-to)512-514
Number of pages3
JournalThin Solid Films
Volume210-211
Issue numberPART 2
DOIs
Publication statusPublished - 1992 Apr 30
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Electron spin resonance in Langmuir-Blodgett films of a merocyanine dye and its isotope-substituted analogs'. Together they form a unique fingerprint.

  • Cite this