Time-resolved interaction of polar solvents with excited pyrylium cations |
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| Affiliation: | 1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada;2. Affiliate, Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA 94720, USA;3. Guest Scientist, Isotopes Project, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;1. School of Mechanical Engineering, Korea University, Seoul, 02841, Republic of Korea;2. Department of Chemical & Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260-4200, USA;1. Department of Chemical and Materials Engineering and Green Technology Research Center, Chang Gung University, Kwei-shan, Taoyuan 333, Taiwan;2. Green Energy and Environment Research Laboratories, Industrial Technology Research Institute (ITRI), Hsin-Chu 310, Taiwan;1. Department of Organic Chemistry, Faculty of Chemistry, University of Lodz, 91-403 Lodz, Poland;2. Laboratory of Separation and Spectroscopic Methods Applications, Center for Interdisciplinary Research, The John Paul II Catholic University of Lublin, al. Krasnicka 102, 20-718 Lublin, Poland;3. Screening Laboratory, Institute of Medical Biology of the Polish Academy of Sciences, Lodz 92-232, Poland;4. Department of Theoretical and Structural Chemistry, Faculty of Chemistry, University of Lodz, 90-236 Pomorska 163/165, Lodz, Poland;5. Faculty of Biology and Chemistry, Department of Theoretical Chemistry, University of Bialystok, Bialystok 15-399, Poland |
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| Abstract: | ![]()
The time-resolved fluorescence spectra of two pyrylium-ion derivatives have been investigated. In the temperature range 77 to 190 K, a red-shift of the fluorescence spectra of the order of 25–70 nm is observed and assigned to a fast solvent relaxation process. Time-resolved experiments carried out at 160 K showed a rapid decrease of the emission from the non-relaxed excited state at short wavelengths and a corresponding build-up of the emission of the relaxed one at longer wavelengths. At 120 K emission from the non-relaxed electronic state is predominant. |
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