One- and Two-Dimensional EPR Studies on the Radical Pair Generated by the Photoreduction of 9,10-Anthraquinone-1,5-disulfonate in Aerosol OT Reverse Micelles

DOI Web Site 被引用文献1件
  • Kimio Akiyama
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
  • Shozo Tero-Kubota
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

書誌事項

公開日
2002-02-09
DOI
  • 10.1021/jp0155157
公開者
American Chemical Society (ACS)

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説明

Spin-correlated radical pairs (SCRP) formed by the photoreduction of 9,10-anthraquinone-1, 5-disulfonic acid (1,5-AQDS) disodium salt in aerosol OT (AOT) reverse micelles were studied using time-resolved and pulsed electron paramagnetic resonance (EPR) techniques. Photoirradiation of 1,5-AQDS in AOT micellar solution exhibited a strong polarized EPR spectrum in the presence of water-soluble hydroquinones (H2Q). The polarization patterns varied from E*/A of radicals to the antiphase structure (APS) of SCRP in the early delay period after the laser pulse irradiation. By analysis of the spectra, the radicals were assigned to the corresponding benzoquinone anion radicals. On the basis of our results, the initial process of the 1,5-AQDS triplet quenching may be the electron transfer from H2Q. The consecutive reaction mechanism was proposed for the generation of the SCRP within the water pools. The slower evolution of the SCRP polarization is a result of the sequential radical reactions followed by the spin sel...

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