National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology, School of Material Science and Engineering, Shaanxi University of Technology (SNUT), Hanzhong, 723001, P. R. China.
Macromol Rapid Commun. 2018 Jun;39(11):e1800073. doi: 10.1002/marc.201800073. Epub 2018 May 3.
Two novel, donor-acceptor-type π-conjugated polymers (P1 and P2) with 3'-(thieno[3,2-b]thiophene-2,5-diylbis(methan-1-yl-1-ylidene))bis-(indolin-2-one) (ITTI) as the acceptor and thiophene/bithiophene as the donor are designed and synthesized by palladium-catalyzed Stille coupling. The optical and electrochemical properties of these polymers are characterized and further implemented into organic field-effect transistors (OFET). Both polymers exhibit excellent thermal stability, broad UV-vis absorption, and high highest occupied molecular orbital energy levels. Thermal annealing induces a well-ordered structure, a highly planar π-system (oxygen-sulfur interaction), and a bathochromic shift in the polymers; furthermore, significant enhancement of the long wavelength intensity is also observed. Both polymers exhibit p-type charge transport behavior, with hole mobilities up to 0.51 cm V s for P1 and 0.65 cm V s for P2. This work demonstrates that ITTI can be a promising building block for the construction of donor-acceptor polymers with high-performance OFETs.
两种新型给体-受体型π-共轭聚合物（P1 和 P2），以 3'-(噻吩[3,2-b]噻吩-2,5-二基双（甲烷-1-基-1-亚基））双（吲哚啉-2-酮）（ITTI）为受体，噻吩/联噻吩为供体，通过钯催化的 Stille 偶联反应设计和合成。这些聚合物的光学和电化学性质得到了表征，并进一步应用于有机场效应晶体管（OFET）中。两种聚合物均表现出优异的热稳定性、宽的紫外-可见吸收和高的最高占据分子轨道能级。热退火诱导聚合物形成有序结构、高度平面的π-体系（氧-硫相互作用）和红移，并且还观察到长波长强度的显著增强。两种聚合物均表现出 p 型电荷输运行为，其中 P1 的空穴迁移率高达 0.51 cm V s，P2 的空穴迁移率高达 0.65 cm V s。这项工作表明，ITTI 可以成为构建具有高性能 OFET 的给体-受体聚合物的有前途的构建模块。
