pH Dependence of Photochemical Kinetics of Thioxanthen-9-one from Nanosecond Time-resolved Laser Flash Photolysis

作     者：Lin Chen Yuan-ming Li Min Zheng Xin Wei Lin Wang Lin Chen;Yuan-ming Li;Min Zheng;Xin Wei;Lin Wang

作者机构：School of Physics and Materials EngineeringHefei Normal UniversityHefei 230601China Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026China 

基　　金：This work was supported by the Educational Com-mission of Anhui Province of China(No.KJ2018A0491 and KJ2019A0736) the National Natural Science Foun-dation of China(No.21873089) the Natural Science Foundation of Anhui Province(No.1908085MB50) 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2021年第34卷第4期

页      码：443-452,I0003页

摘      要：pH dependent uorescence emission of a thioxanthone-based probe has been re-ported *** potential deter-minant factors of pH dependence may provide important clues to design novel thioxanthone-based probes in the *** dependence of photochemical kinetics of thioxanthone itself was inves-tigated in this work using nanosecond time-resolved laser ash *** nanosecond time-resolved transient absorption spectra and kinetics of TX in aqueous acetonitrile were recorded,as well as for a model reaction system including TX with diphenylamine(DPA)as a *** the well-known absorption peak of ^(3)TX*,other peaks at 417,518,673 and 780 nm,have been reliably attributed to major intermediates in the overall reaction between TX and DPA with photolysis,which has been con rmed to occur along a multistep *** the strong acidic solution(pH≈3.0),TX and protonated TX ions(TXH^(+))coexist due to protonated ***,high proton concentration promotes the predominant decay pathway after photolysis from electron transfer to proton ***,the di erent primary products,^(3)TXH^(+*)or TX^(·-),proceed di erent secondary reaction *** addition,within the wide pH range from weak acid(pH=5.0)to alkaline solution(pH=13.0),the overall reaction mechanism and rates do not show visible changes.

主 题 词：Nanosecond laser ash photolysis pH dependence Protonation Electron transfer Proton transfer 

学科分类：081704[081704] 07[理学] 08[工学] 0817[工学-轻工类] 070302[070302] 0703[理学-化学类] 

核心收录：

D　O　I：10.1063/1674-0068/cjcp2104057

馆 藏 号：203104856...