Ultrafast Ground-State Intramolecular Proton Transfer in Diethylaminohydroxyflavone Resolved with Pump-Dump-Probe Spectroscopy

doi:10.1021/acs.jpclett.8b01826

	Ultrafast Ground-State Intramolecular Proton Transfer in Diethylaminohydroxyflavone Resolved with Pump-Dump-Probe Spectroscopy
	Kuang, Zhuoran 1,2; Guo, Qanjin 1; Wang, Xian 1,2; Song, Hongwei 1,2; Maroncelli, Mark 3; Xia, Andong 1,2
刊名	JOURNAL OF PHYSICAL CHEMISTRY LETTERS
	2018-08-02
卷号	9 期号:15 页码:4174-4181
ISSN号	1948-7185
DOI	10.1021/acs.jpclett.8b01826
英文摘要	4'-N,N-Diethylamino-3-hydroxyflavone (DEAHF), due to excited-state intramolecular proton transfer (ESIPT) reaction, exhibits two solvent-dependent emission bands. Because of the slow formation and fast decay of the ground-state tautomer, its population does not accumulate enough for its detection during the normal photocycle. As a result, the details of the ground-state intramolecular proton-transfer (GSIPT) reaction have remained unknown. The present work uses femtosecond pump dump probe spectroscopy to prepare the short-lived ground-state tautomer and track this GSIPT process in solution. By simultaneously measuring femtosecond pump probe and pump dump probe spectra, ultrafast kinetics of the ESIPT and GSIPT reactions are obtained. The GSIPT reaction is shown to be a solvent-dependent irreversible two-state process in two solvents, with estimated time constants of 1.7 ps in toluene and 10 ps in the more polar tetrahydrofuran. These results are of great value in both fully describing the photocycle of this four-level proton transfer molecule and for providing a deeper understanding of dynamical solvent effects on tautomerization.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000440956500006
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/41931]
专题	化学研究所_光化学实验室
通讯作者	Maroncelli, Mark; Xia, Andong
作者单位	1.Chinese Acad Sci, Inst Chem, Key Lab Photochem, BNLMS, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Penn State Univ, Dept Chem, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Kuang, Zhuoran,Guo, Qanjin,Wang, Xian,et al. Ultrafast Ground-State Intramolecular Proton Transfer in Diethylaminohydroxyflavone Resolved with Pump-Dump-Probe Spectroscopy[J]. JOURNAL OF PHYSICAL CHEMISTRY LETTERS,2018,9(15):4174-4181.
APA	Kuang, Zhuoran,Guo, Qanjin,Wang, Xian,Song, Hongwei,Maroncelli, Mark,&Xia, Andong.(2018).Ultrafast Ground-State Intramolecular Proton Transfer in Diethylaminohydroxyflavone Resolved with Pump-Dump-Probe Spectroscopy.JOURNAL OF PHYSICAL CHEMISTRY LETTERS,9(15),4174-4181.
MLA	Kuang, Zhuoran,et al."Ultrafast Ground-State Intramolecular Proton Transfer in Diethylaminohydroxyflavone Resolved with Pump-Dump-Probe Spectroscopy".JOURNAL OF PHYSICAL CHEMISTRY LETTERS 9.15(2018):4174-4181.