Zhuo-Cheng Li, Hao Cui, Su-Hang Xu, Zi-Hang Zhang, Zuo-Qin Liang, Chang-Qing Ye and Xiao-Mei Wang
{"title":"Effect of cis/trans isomerization on the photochromic performances of triphenylethylene†","authors":"Zhuo-Cheng Li, Hao Cui, Su-Hang Xu, Zi-Hang Zhang, Zuo-Qin Liang, Chang-Qing Ye and Xiao-Mei Wang","doi":"10.1039/D4NJ02060J","DOIUrl":null,"url":null,"abstract":"<p >Revealing the structure–property relationships is crucial for promoting the development of photochromic materials and achieving the desired function in practical applications. Herein, a series of triphenylethylene photochromic materials (<strong>TP</strong>, <strong>TP-F</strong>, <strong>TP-Cl</strong> and <strong>TP-Br</strong>) have been synthesized and their photochromic properties were investigated. Monohalogenated <strong>TP-F</strong>, <strong>TP-Cl</strong> and <strong>TP-Br</strong> display obvious photochromic behaviors in solution, the solid state and polymer film. It is found that the halogen atoms with weak electron withdrawing ability can dramatically enhance the photocolorabilities of triphenylethylene. Moreover, <strong>TP-Cl</strong> and <strong>TP-Br</strong> exhibit different fatigue processes from <strong>TP-F</strong>. The further characterization reveals that the key factor leading to the diverse photochromic properties is <em>cis</em>/<em>trans</em> isomerization of triphenylethylene. The coloration of triphenylethylene mainly comes from the photo-triggered cyclization of <em>cis</em>-isomers. The initial attenuation of <strong>TP-Cl</strong> and <strong>TP-Br</strong> under UV irradiation is mostly caused by <em>cis–trans</em> photoisomerization, rather than the oxygen-involved photooxidation reactions. Based on the controllable “turn-on” and “turn-off” photobehaviors, <strong>TP-Cl</strong> and <strong>TP-Br</strong> were applied in the photoswitchable patterns, showing an enhanced signal-to-background ratio.</p>","PeriodicalId":95,"journal":{"name":"New Journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"New Journal of Chemistry","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/nj/d4nj02060j","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Revealing the structure–property relationships is crucial for promoting the development of photochromic materials and achieving the desired function in practical applications. Herein, a series of triphenylethylene photochromic materials (TP, TP-F, TP-Cl and TP-Br) have been synthesized and their photochromic properties were investigated. Monohalogenated TP-F, TP-Cl and TP-Br display obvious photochromic behaviors in solution, the solid state and polymer film. It is found that the halogen atoms with weak electron withdrawing ability can dramatically enhance the photocolorabilities of triphenylethylene. Moreover, TP-Cl and TP-Br exhibit different fatigue processes from TP-F. The further characterization reveals that the key factor leading to the diverse photochromic properties is cis/trans isomerization of triphenylethylene. The coloration of triphenylethylene mainly comes from the photo-triggered cyclization of cis-isomers. The initial attenuation of TP-Cl and TP-Br under UV irradiation is mostly caused by cis–trans photoisomerization, rather than the oxygen-involved photooxidation reactions. Based on the controllable “turn-on” and “turn-off” photobehaviors, TP-Cl and TP-Br were applied in the photoswitchable patterns, showing an enhanced signal-to-background ratio.