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

Fingerprint

Langmuir Blodgett films
Langmuir-Blodgett films
Isotopes
Paramagnetic resonance
electron paramagnetic resonance
Nitrogen
Dyes
isotopes
dyes
analogs
nitrogen
Substitution reactions
Coloring Agents
substitutes
Chromophores
Wave functions
hyperfine structure
chromophores
Charge transfer
charge transfer

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Electron spin resonance in Langmuir-Blodgett films of a merocyanine dye and its isotope-substituted analogs. / Kuroda, Shin ichi; Ikegami, Keiichi; Tabe, Yuka; Saito, Kazuhiro; Saito, Mitsuyoshi; Sugi, Michio; Yasui, Shigeo.

In: Thin Solid Films, Vol. 210-211, No. PART 2, 30.04.1992, p. 512-514.

Research output: Contribution to journalArticle

Kuroda, Shin ichi ; Ikegami, Keiichi ; Tabe, Yuka ; Saito, Kazuhiro ; Saito, Mitsuyoshi ; Sugi, Michio ; Yasui, Shigeo. / Electron spin resonance in Langmuir-Blodgett films of a merocyanine dye and its isotope-substituted analogs. In: Thin Solid Films. 1992 ; Vol. 210-211, No. PART 2. pp. 512-514.
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AU - Saito, Mitsuyoshi

AU - Sugi, Michio

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