文献类型：期刊文献

英文题名：All-Visible-Light-Activated Dithienylethenes Induced by Intramolecular Proton Transfer

作者：Xi, Hancheng[1,2];Zhang, Zhipeng[1,2];Zhang, Weiwei[1,2];Li, Mengqi[1,2];Lian, Cheng[1,2];Luo, Qianfu[1,2];Tian, He[1,2];Zhu, Wei-Hong[1,2]

机构：[1]East China Univ Sci & Technol, Key Lab Adv Mat, Inst Fine Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Joint Int Res Lab Precis Chem & Mol Engn, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn,Inst Fine Chem,Shanghai Key L, Shanghai 200237, Peoples R China

年份：2019

卷号：141

期号：46

起止页码：18467

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20194607687718);WOS:【SCI-EXPANDED(收录号:WOS:000499738700017)】；

基金：This work was supported by NSFC/China for the Science Center Program (21788102), Creative Research Groups (21421004) and Key Project (21636002), NSFC/China (21905091), National Key Research and Development Program (2016YFA0200300), Shanghai Municipal Science and Technology Major Project (Grant 2018SHZDZX03), the Innovation Program of Shanghai Municipal Education Commission, Scientific Committee of Shanghai (15XD1501400), Programme of Introducing Talents of Discipline to Universities (B16017), and China Postdoctoral Science Foundation (2019M651418).

语种：英文

外文关键词：Proton transfer - Ultraviolet radiation - Photochromism

摘要：The fast light-responsive dithienylethenes (DTEs) are one of the most attractive photochromic families because of their excellent thermal irreversibility and fatigue resistance. However, the all-visible-light-activated DTE system still remains challenging because most of them require the harmful high-energy ultraviolet light to trigger their photocyclization reaction. Here, we have for the first time borrowed a specific intramolecular proton transfer (IPT) process and rationally designed a series of all-visible-light-driven DTEs. Incorporating the IPT-functional group to DTE unit gives rise to an extra absorption band with a distinct red shift, which enables the photocyclization of DTEs under stimuli of visible light at 450 nm, as well as ensuring the desirable photoswitching efficiency. The isomerization from OH form to NH form induced by IPT can decrease the energy gap for excitation and photocyclization, thereby affording the all-visible-light-triggered photochromic performance, which can not only work well in a polar solvent system but also show its effectiveness in polymeric gel systems. In this regard, we can provide a general and reliable platform to construct all-visible-light-driven DTEs with excellent reversible photoswitching and broad applicability, especially with avoiding the use of harmful ultraviolet light to induce their photocyclization.