有机化学 ›› 2020, Vol. 40 ›› Issue (9): 2919-2928.DOI: 10.6023/cjoc202005035 上一篇    下一篇

研究论文

靛红并苊醌二甲酰亚胺类共轭分子的设计合成及性质研究

谭丹a, 吴赛a, 魏欢b, 胡袁源b, 陈华杰a   

  1. a 湘潭大学化学学院 环境友好化学与应用教育部重点实验室 湖南湘潭 411105;
    b 湖南大学物理与微电子科学学院 微纳光电器件及应用教育部重点实验室 长沙 410082
  • 收稿日期:2020-05-14 修回日期:2020-06-12 发布日期:2020-06-28
  • 通讯作者: 陈华杰 E-mail:chenhjoe@163.com, chenhjoe@xtu.edu.cn
  • 基金资助:
    国家自然科学基金(No.21875202)、湖南省自然科学基金杰出青年基金(No.2018JJ1024)和湖南省科技厅计划(No.2017RS3048)资助项目.

Design, Synthesis, and Properties of Conjuated Molecules with Isatin-Fused Acenaphthenequinone Imide Moieties

Tan Dana, Wu Saia, Wei Huanb, Hu Yuanyuanb, Chen Huajiea   

  1. a Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan 411105;
    b Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082
  • Received:2020-05-14 Revised:2020-06-12 Published:2020-06-28
  • Supported by:
    Project supported by the National Natural Science Foundation of China (No. 21875202), the Hunan Provincial Natural Science Foundation of China (No. 2018JJ1024), and the Science and Technology Planning Project of Hunan Province (No. 2017RS3048).

将靛红和氮杂靛红衍生物单元分别与苊醌二甲酰亚胺进行Knoevenagel缩合,开发了两个结构新型、强缺电特性的异靛青衍生物受体单元,包括靛红并苊醌二甲酰亚胺单元(A1)和氮杂靛红并苊醌二甲酰亚胺单元(A2).然后运用"双受体策略",进一步设计并合成了两个含A1A2受体单元的A-A型二联体共轭分子(BA1BA2),并对比研究了吡啶氮原子对共轭分子的骨架结构、吸收光谱、能级结构以及载流子迁移率的影响.研究发现:相比经典的异靛蓝受体,A1A2受体单元拥有更低的LUMO能级(ca.-4.0 eV)和更大的骨架共轭;相比A1A2,二联体化合物BA1BA2不仅拥有更大的骨架共轭和更好的分子对称性,而且在整个紫外-可见光区的展现出强的光捕获能力;吡啶氮原子的引入增强了A2BA2的骨架共平面性以及电子亲和力,有效地降低了A2BA2的HOMO和LUMO能级值.基于BA1BA2薄膜,制备了n-型场效应晶体管器件,其电子迁移率分别达1.64×10-3和2.52×10-3 cm2·V-1·s-1.

关键词: 靛红, 苊醌二甲酰亚胺, 异靛青, 电子迁移率

Two highly electron-deficient, novel isoindigo (IID) derivative acceptor units, including isatin-fused acenaphthenequinone imide (A1) and nitrogen-doped isatin-fused acenaphthenequinone imide (A2), were designed and synthesized via Knoevenagel consendation reaction. In comparison with the well-known IID unit, both A1 and A2 acceptor units exhibit reduced LUMO energy levels (ca. -4.0 eV) and extended π-conjugation backbone owing to the incorporation of strongly electron-withdrawing acenaphthenequinone imide. The properties observed here for both A1 and A2 are thus indicative of promising potential in the development of n-type organic semiconductors. On the basis of both A1 and A2 acceptor units, two A-A type organic π-conjugated molecules (BA1 and BA2) were further designed and synthesized by self-coupling of two identical A1 or A2 acceptor units. The effect of pyridal nitrogen on the backbone structure, optical absorption, energy level, and carrier mobility of the as-prepared π-conjugated molecules is studied systematically. The comparative investigation reveals that self-coupling of dual acceptor units into BA1 and BA2 not only endows them with extended conjugation backbone and enhanced molecular symmetry, but also improves their light-capturing abilities in the whole ultraviolet-visible region as relative to their parent acceptor units (A1 and A2). Moreover, the pyridal N-containing BA1 and BA2 possess enhanced backbone coplanarity and electron affinity as compared to their parent units (A1 and A2), thereby leading to reduced HOMO and LUMO energy levels. Finally, n-type thin-film transistors are further fabricated by adopting both BA1 and BA2 as the active layers, affording the electron motilities of 1.64×10-3 and 2.52×10-3 cm2·V-1·s-1, respectively.

Key words: isatin, acenaphthenequinone imide, isoindigo, electron mobility