Aggregation-enhanced emission (AEE)-active polyamides with methylsulfonyltriphenylamine units for electrofluorochromic applications. (June 2017)

• Record Type: Journal Article
• Authors: Sun, Ningwei; Zhou, Ziwei; Meng, Shiyao; Chao, Danming; Chu, Xiaojing; Zhao, Xiaogang; Wang, Daming; Zhou, Hongwei; Chen, Chunhai
• Is Part Of: Dyes and pigments. Volume 141(2017)
• Page Start: 356
• Page End: 362
• Publication Date: 2017-06
• Subjects: Triphenylamine -- Sulfone -- Polyamide -- Electrochromism -- Electrofluorochromism; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2017.01.078
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: In this work, a series of AEE-active polyamides containing methylsulfonyltriphenylamine units were prepared from a newly synthesized diamine "4, 4′-diamine-4″-methylsulfonyltriphenylamine" and three dicarboxylic acids, which were highly soluble in various organic solvents and exhibited outstanding thermostability. The resulting polymer films showed one reversible redox couple along with apparent color changing from colorless to purple. The polymer solutions revealed relatively weak fluorescence with quantum yields in the range of 2.2–26.2%, which could be enhanced by induced aggregation in poor solvents. Furthermore, the bright fluorescence of the solid polymer film could be reversibly tuned by direct electrochemical redox of triphenylamine with a high contrast ratio ( I off / I on ) of 234. Overall, this comprehensive investigation of their interesting electrochromic and electrofluorochromic bifunctional properties not only supplies a deep understanding of the optical essence upon electrical stimuli but also paves the way for their future intelligent applications. Graphical abstract: A series of AEE-active polyamides containing methylsulfonyltriphenylamine units were prepared, which exhibited stable and high-contrast electrochromic/electrofluorochromic properties. Highlights: A new diamine with methylsulfonyltriphenylamine unit was synthesized. A series of polyamides with methylsulfonyltriphenylamine units were prepared. AEE fluorescence and solvatochromism of these polyamides were studied. These polyamides exhibited interesting electrochromic/electrofluorochromic dual-switching properties.