Doublet-doublet fluorescence of benzyl,p-methylbenzyl and p-chlorobenzyl radicals in solution |
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| Affiliation: | 1. Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, China;2. State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Meilong Road 130, Shanghai 200237, China;1. Facultad de Química, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, Coyoacán 04510, México D.F., Mexico;2. Indian Institute of Technology (IIT), Ropar, Punjab, India;3. Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México (UNAM), Ciudad Universitaria, Coyoacán 04510, México D.F., Mexico;1. Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal road, Tarnaka, Hyderabad 500007, India;2. R & D Center for Engineering and Science, JEC group of Colleges, Jaipur Engineering College, Kukas, Jaipur 303101, India;1. Department of Chemistry, Jadavpur University, Kolkata 700032, India;2. Department of Chemistry, Acharya B. N. Seal College, Cooch Behar, West Bengal 736101, India;1. Department of Biological Chemistry, Weizmann Institute of Science, Rehovot 7610001, Israel;2. Department of Structural Biology, Weizmann Institute of Science, Rehovot 7610001, Israel |
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| Abstract: | The doublet-doublet fluorescence spectra of benzyl, p-methylbenzyl and p-chlorobenzyl radicals were detected in the 450–650 nm region upon the double-pulse (248 nm→308 nm) excitation of corresponding benzyl chlorides in hexane at room temperature. The respective fluorescence lifetimes were determined to be ≈ 1 ns or less (benzyl), 14 ns (p-methylbenzyl) and 81 ns (p-chlorobenzyl). Extensively temperature-dependent non-radiative relaxation was confirmed for these benzyl radicals with close-lying lowest doublet excited states. |
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