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

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...

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Bibliographic Details
Published in:Thin solid films 1992-04, Vol.210, p.512-514
Main Authors: Kuroda, Shin-ichi, Ikegami, Keiichi, Tabe, Yuka, Saito, Kazuhiro, Saito, Mitsuyoshi, Sugi, Michio, Yasui, Shigeo
Format: Article
Language:English
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Summary: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.
ISSN:0040-6090
1879-2731
DOI:10.1016/0040-6090(92)90327-8