文献类型：期刊文献

英文题名：Invisible photochromism and optical anti-counterfeiting based on D-A type inverse diarylethene

作者：Wang, Jiaxing[1,2];Gao, Ya[3];Zhang, Junji[1,2];Tian, He[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, Shanghai 200237, Peoples R China;[3]Shanghai Univ Engn Sci, Coll Fundamental Studies, Shanghai 201620, Peoples R China

年份：2017

卷号：5

期号：18

起止页码：4571

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20172803900324);WOS:【SCI-EXPANDED(收录号:WOS:000401103000029)】；

基金：This research is supported by the National Natural Science Foundation of China (21402050, 21420102004), the Programme of Introducing Talents of Discipline to Universities (B16017) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Sulfur - Electrons - Olefins - Photochromism

摘要：In most cases, inverse type diarylethenes (DAEs) exhibit a bathochromic shift of the p-conjugation absorption band after photocyclization, which leads to "visible'' closed forms and "visible'' photochromic behaviors. The reason for the bathochromic shift is that the lone pair electrons on the sulfur atoms of the thiophene rings function as pi-electrons and participate in pi-conjugation. To make photochromic behaviors "invisible'', electron-withdrawing aldehyde groups were introduced into the inverse DAE to endow lone pair electrons on the sulfur atoms with more n-electron characteristics and then achieved the hypsochromic shift of the p-conjugation absorption band after photocyclization. As a result, the absorption changes of aldehyde modified inverse DAE (IDAEo-2CHO) remained "invisible'' during isomerization, and the only fluorescence changes can be observed by the naked eye after photocyclization. Taking advantage of this unique optical feature of IDAEo-2CHO, anti-counterfeiting applications were implemented.