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Excited-state proton transfer in 2-(2'-hydroxyphenyl)benzothiazole: formation of the anion in polar solvents
Institution:1. Department of Chemistry, Bohai University, Jinzhou 121013, China;2. State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining and Metallurgy, Beijing 102600, China;1. Université de Nantes, UFR Sciences et Techniques, UMR CNRS 6230, CEISAM, 2 rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France;2. Institut Universitaire de France, 1 rue Descartes, 75231 Paris Cedex 05, France;1. Ministry of Education Key Laboratory of Synthetic and Natural Functional Molecule Chemistry, College of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710127, PR China;2. Key Laboratory of Resource Biology and Biotechnology in Western China (Northwest University), Ministry of Education, Biomedicine Key Laboratory of Shaanxi Province, Northwest University, Xi’an, Shaanxi 710069, PR China;3. College of Chemistry and Chemical Engineering, Xi''an University of Science and Technology, Xi''an, Shaanxi 710054, PR China
Abstract:Excited-state proton transfer in 2-(2'-hydroxyphenyl)benzothiazole (HBT) dissolved in pyridine is investigated. New absorptions and fluorescence bands are detected after addition of water or NaOH to the solution. The spectra are identical to the HBT anion absorption and fluorescence. Picosecond spectroscopy is used to determine the kinetics of electronically excited states. The excited-state lifetime of the anion is 3.5 ns. The tautomeric fluorescence of HBT after proton transfer builds up within 4 ps after excitation and decays with a time constant of 20 ps.
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