摘要
The excited-state intramolecular proton transfer of 2-(2-hydroxyphenyl)benzoxazole dye in different solvents is investigated using ultrafast femtosecond transient absorption spectroscopy combined with quantum chemical calculations.Conformational conversion from the syn-enol configuration to the keto configuration is proposed as the mechanism of excited-state intramolecular proton transfer.The duration of excited-state intramolecular proton transfer is measured to range from 50 fs to 200 fs in different solvents.This time is strongly dependent on the calculated energy gap between the N-S;and T-S;structures in the S;state.Along the proton transfer reaction coordinate,the vibrational relaxation process on the S;state potential surface is observed.The duration of the vibrational relaxation process is determined to be from8.7 ps to 35 ps dependent on the excess vibrational energy.
作者
Simei Sun
Song Zhang
Jiao Song
Xiaoshan Guo
Chao Jiang
Jingyu Sun
Saiyu Wang
孙四梅;张嵩;宋娇;郭小珊;江超;孙静俞;王赛玉(Huangshi Key Laboratory of Photoelectric Technology and Materials,College of Physics and Electronic Science,Hubei Normal University,Huangshi 435002,China;State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China;Hubei Key Laboratory of Pollutant Analysis&Reuse Technology,College of Chemistry and Chemical Engineering,Hubei Normal University,Huangshi 435002,China)
基金
supported by the Natural Science Foundation of Hubei Province,China(Grant No.2020CFB468)
the Guiding Project of Scientific Research Plan of Department of Education of Hubei Province,China(Grant No.B2020136)
the National Key Research and Development Program of China(Grant No.2019YFA0307700)
the National Natural Science Foundation of China(Grant Nos.11974381,11674355,and 21507027)。
