Ultrafast proton transfer dynamics of 2-(2′-hydroxyphenyl)benzoxazole dye in different solvents

被引：0
|
作者：
Sun, Simei [1 ]
Zhang, Song [2 ]
Song, Jiao [1 ]
Guo, Xiaoshan [1 ]
Jiang, Chao [1 ]
Sun, Jingyu [3 ]
Wang, Saiyu [1 ]
机构：
[1] Hubei Normal Univ, Coll Phys & Elect Sci, Huangshi Key Lab Photoelect Technol & Mat, Huangshi 435002, Hubei, Peoples R China
[2] Chinese Acad Sci, Innovat Acad Precis Measurement Sci & Technol, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
[3] Hubei Normal Univ, Coll Chem & Chem Engn, Hubei Key Lab Pollutant Anal & Reuse Technol, Huangshi 435002, Hubei, Peoples R China
来源：
CHINESE PHYSICS B | 2022年 / 31卷 / 02期
基金：
中国国家自然科学基金;
关键词：
proton transfer; vibrational relaxation; femtosecond transient absorption spectroscopy; quantum chemical calculations; EXCITED-STATE; TRANSFER ESIPT; CHARGE-TRANSFER; COUPLED PROTON; BENZOXAZOLE; HBO; FLUORESCENCE; BENZOTHIAZOLE; LUMINESCENCE; PHOTOPHYSICS;
D O I：
10.1088/1674-1056/ac3734
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
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-0 and T-S-1 structures in the S-1 state. Along the proton transfer reaction coordinate, the vibrational relaxation process on the S-1 state potential surface is observed. The duration of the vibrational relaxation process is determined to be from 8.7 ps to 35 ps dependent on the excess vibrational energy.
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页数：7
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