Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1987.doi: 10.7503/cjcu20200770

• Polymer Chemistry • Previous Articles     Next Articles

Construction of Room Temperature Phosphorescence System of Thioflavin-based Polylactide/Benzenesulfonic Acid

LI Xinyu, LI Zhiwei, ZHANG Xingyuan()   

  1. Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026,China
  • Received:2020-10-23 Online:2021-06-10 Published:2021-06-08
  • Contact: ZHANG Xingyuan E-mail:zxym@ustc.edu.cn
  • Supported by:
    the National High?tech Research and Development Projects of China(2015AA033903)

Abstract:

The electron?donating groups, —OH, —SH and —MeOH, were respectively introduced on thioflavin, and three thioflavin derivatives, 2?[4?(benzothiazole?2?yl) phenoxy ethan?1?ol](BT?OH), 2?{[4?(benzothiazole?2?yl)phenyl]thio} ethan?1?ol(BT?SH) and 2?[4?(benzothiazole?2?yl)?2?methoxyphenoxy] ethan?1?ol(BT?M?OH), were synthesized. The derivatives were used as initiators for the polymerization of DL?lactide to obtain three thioflavin?based polylactides. Benzenesulfonic acid was subsequently added to construct thioflavin?based polylactide/benzenesulfonic acid system that can produce room temperature phosphorescence. The tunable molecular emission from fluorescence to phosphorescence was realized, and the longest life of phosphorescence is 108.19 ms. The results reveal that the introduction of benzenesulfonic acid can cause the thioflavin?based polylactide to produce an intramolecular charge?transfer state, and the protonation effect leads to green and orange phosphorescent emission.

Key words: Polymer room temperature phosphorescence, Charge?transfer state, Thioflavin?based polylactide, Benzenesulfonic acid

CLC Number: 

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