3,4-Ethylenedioxythiophene-Based Isomer-Free Quinoidal Building Block and Conjugated Polymers for Organic Field-Effect Transistors
作者:Kyoungtae Hwang、Min-Hye Lee、Jihong Kim、Yeon-Ju Kim、Yunseul Kim、Hansu Hwang、In-Bok Kim、Dong-Yu Kim
DOI:10.1021/acs.macromol.9b02237
日期:2020.3.24
quinoidal building block (bis-QEDOT). As a result, isomer-free bis-QEDOT is synthesized by introducing the 3,4-ethylenedioxy group, and the geometrical structure of bis-QEDOT is identified by thin-layer chromatography, 1H NMR, and density functional theory calculation. Furthermore, thiophene (T), bithiophene (2T), and thienylene vinylene (TV) as π-conjugated building blocks are polymerized with bis-QEDOT
由于quinoidal分子在芳环之间具有双键连接,因此,由于具有高平面性和扩展的π共轭长度,它们对于有效的电荷传输具有许多优势。然而,它们不可避免地产生一些异构体,这导致纯化和表征困难。在这项研究中,引入了硫氧构象锁定和空间排斥方法来控制喹啉结构单元(bis-QEDOT)的顺式和反式异构化。结果,通过引入3,4-乙二氧基合成了无异构体的bis-QEDOT,并通过薄层色谱法鉴定了bis-QEDOT的几何结构,11 H NMR和密度泛函理论计算。此外,将作为π共轭结构单元的噻吩(T),联噻吩(2T)和亚噻吩基亚乙烯基(TV)与bis-QEDOT聚合。由于采用了醌型结构,PQEDOT-T,PQEDOT-2T和PQEDOT-TV表现出增强的近红外吸收和〜1.16 eV左右的低带隙。掠入射的广角X射线衍射表明,在250°C的温度下进行退火后,三种醌型聚合物在(h 00)衍射峰中均显示出高达三阶的峰,