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Significance Statement
Conjugated polymers have been envisioned as one of the most favored electrochromic materials including optical displays, smart windows, mirrors, and camouflage materials. Although many neutral-state red and blue polymers have been reported up to date, neutral-state green electrochromic materials appear to be limited only to benzothiadiazole derivatives and thieno[3,4-b]pyrazine derivatives based donor−acceptor-type polymers. This situation seriously impeded the development of neutral-state green electrochromic materials, further restricting the richness of multi-color electrochromic materials. Lately in China, Xu and Lu et al. employed a more electron deficient acceptor, thiadiazolo[3,4-c]pyridine (PT), for the development of novel neutral-state green electrochromic polymers. The designed polymer materials from 3,4-dioxyethylenethiophene end-capped PT was found to exhibit favorable redox activity and stability and also lower bandgap than its benzothiadiazole (BT) analog. Moreover, it also displayed very fast switching time, good optical memory, and higher coloration efficiency than the BT analog. From their results, it is quite expected that PT as an excellent acceptor could be further employed towards the rational design of high-performance neutral green electrochromic polymers.
![Thiadiazolo[3,4-c]pyridine as an Acceptor toward Fast-Switching Green Donor–Acceptor-Type Electrochromic Polymer with Low Bandgap. Advances in Engineering](https://advanceseng.com/wp-content/uploads/2015/07/Image-for-ACS-Appl.Mater_.Interfaces-2015711089−11098.jpg)
Journal Reference
Shouli Ming , Shijie Zhen , Kaiwen Lin , Li Zhao , Jingkun Xu , Baoyang Lu. ACS Appl. Mater. Interfaces, 2015, 7 (21), pp 11089–11098.
Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang, Jiangxi 330013, China
Abstract
Thiadiazolo[3,4-c]pyridine (PT), an important analog of benzothiadiazole (BT), has most recently been explored as a novel electron acceptor. It exhibits more electron-accepting ability and other unique properties and potential advantages over BT, thus inspiring us to investigate PT-based donor−acceptor-type (D−A) conjugated polymer in electrochromics. Herein, PT was employed for the rational design of novel donor−acceptor-type systems to yield a neutral green electrochromic polymer poly(4,7-di(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-[1,2,5]thiadiazolo[3,4-c]pyridine) (PEPTE). PEPTE revealed a lower bandgap (Eg,ele = 0.85 eV, Eg,opt = 1.12 eV) than its BT analog and also favorable redox activity and stability. Furthermore, electrochromic kinetic studies demonstrated that PEPTE displayed higher coloration efficiency than BT analog, good optical memory, and very fast switching time (0.3 s at all three wavelengths), indicating that PT would probably be a promising choice for developing novel neutral green electrochromic polymers by matching with various donor units.
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