Comparison of photoinduced electron transfer reactions of aromatic carbonyl vs. cyano compounds with electron donors in condensed phase:the importance |
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| Institution: | 1. Department of Physics, Shahid Beheshti University, G.C., Evin, Tehran, Iran;2. School of Physics, Damghan University, Damghan, Iran;1. Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494, Japan;2. Disaster Prevention Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan;3. Department of Nuclear Engineering and Management, School of Engineering, University of Tokyo, Bunkyo, Tokyo 113-0032, Japan;4. High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan;5. Shimizu Corporation, Ecchujima, Tokyo 135-8530, Japan;6. Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan;7. ATOX Co., Ltd., Kashiwa, Chiba 277-0861, Japan;8. Fermi National Accelerator Laboratory, Batavia, IL 60510, USA;9. Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;10. Research Center for Nuclear Physics, Osaka University, Suita, Osaka 567-0047, Japan;11. Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA;12. Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA;13. Space Sciences Laboratory, University of California, Berkeley, CA 94720-7450, USA;14. RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan;1. Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China;2. College of Chemistry, Xiangtan University, Xiangtan 411105, China |
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| Abstract: | Photoinduced electron transfer reactions in acetonitrile with bensopheneone, anthraquinone, 9-cyanoanthracene and 9,10-dicyanoanthracene as electron acceptors, and with 1,4-diasabicyclo2,2,2]octane and N,N-dimethylaniline as electron donors have been studied with ns-laser flash photolysis and fluorescence quenching measurements. For these systems the resulting free ion yield depends on the spin state of the geminate ion pair: its separation is very efficient if formed in a triplet state (carbonyl compounds/donors), while it is very inefficient if formed in a singlet state (cyanoanthracenes/donors). In the triplet systems, geminate back electron transfer is limited by the rate of spin flip. |
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