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Time-Resolved ESR Study on Complex Radical Pairs Formed in the Photolysis of Methylene Blue Included in Water-Soluble Sulfonated Calixarenes |
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| Authors: | Akiko Tanaka Haruhiko Yashiro Asako Ishigaki Hisao Murai |
| Institution: | 1. Department of Chemistry, Faculty of Science, Tohoku University, Sendai, 980-8578, Japan 2. Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama, 332-0012, Japan 3. Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Toyonaka, Osaka, 560-8531, Japan 4. Japan Society for the Promotion of Science Fellow, Tokyo, 102-8471, Japan 5. Department of Chemistry, Faculty of Science, Shizuoka University, Shizuoka, 422-8529, Japan |
| Abstract: | The photochemical reactions of methylene blue (MB) included in water-soluble sulfonated calixn]arenes (n = 4, 6, 8) are studied using a time-resolved electron spin resonance method. The chemically induced dynamic electron polarization (CIDEP) spectra show the formation of the complex radical pair composed of the MB monocation radical and calixarene (phenoxyl-type) radical. The lifetime and broadened spectral shape are dependent on the size of the calixarene and are due to the longitudinal and transverse relaxation mainly induced by the tumbling motion of the radical pair with the spin dipole–dipole interaction. The pair dissociates in a few hundreds of nanoseconds in cases of n = 6 and 8. |
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