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Solvent effects on the intrinsic enhancement factors of the triplet exciplex generated by photoinduced electron transfer reaction between eosin Y and duroquinone

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2002

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Tachikawa, Takashi
Kobori, Yasuhiro
Akiyama, Kimio
Katsuki, Akio
Usui, Yoshiharu
Tero-Kubota, Shozo

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Molecular Physics. 2002, 100(9), pp. 1413-1420. ISSN 0026-8976. eISSN 1362-3028. Available under: doi: 10.1080/00268970110117962

Zusammenfassung

The spin dynamics of the duroquinone anion radical (DQ ·- ) generated by photoinduced electron transfer reactions from triplet eosin Y ( 3 EY 2- ) to DQ have been studied by using transient absorption and pulsed EPR spectroscopy. Unusual net-absorptive electron spin polarization plus net-emissive polarization were observed, suggesting the production of the triplet exciplex or contact radical pair as the reaction intermediate. The kinetic parameters and intrinsic enhancement factors of the electron spin polarization were determined in various alcoholic solvents. The net-absorptive electron spin polarization was also observed in ethanol- water mixed solvents. The solvent effects on the radical yield are analysed on the basis of a stochastic Liouville equation established for the magnetic field effects on the radical yield. The zero-field splitting constants of the triplet exciplex are estimated from the solvent viscosity dependence of the enhancement factors due to spin-orbit coupling induced depopulation of the reaction intermediate.

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540 Chemie

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ISO 690TACHIKAWA, Takashi, Yasuhiro KOBORI, Kimio AKIYAMA, Akio KATSUKI, Yoshiharu USUI, Ulrich STEINER, Shozo TERO-KUBOTA, 2002. Solvent effects on the intrinsic enhancement factors of the triplet exciplex generated by photoinduced electron transfer reaction between eosin Y and duroquinone. In: Molecular Physics. 2002, 100(9), pp. 1413-1420. ISSN 0026-8976. eISSN 1362-3028. Available under: doi: 10.1080/00268970110117962
BibTex
@article{Tachikawa2002Solve-10024,
  year={2002},
  doi={10.1080/00268970110117962},
  title={Solvent effects on the intrinsic enhancement factors of the triplet exciplex generated by photoinduced electron transfer reaction between eosin Y and duroquinone},
  number={9},
  volume={100},
  issn={0026-8976},
  journal={Molecular Physics},
  pages={1413--1420},
  author={Tachikawa, Takashi and Kobori, Yasuhiro and Akiyama, Kimio and Katsuki, Akio and Usui, Yoshiharu and Steiner, Ulrich and Tero-Kubota, Shozo}
}
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