Synthesis, Characterization, and OFET and OLED Properties of π-Extended Ladder-Type Heteroacenes Based on Indolodibenzothiophene
作者:Changsheng Wang、Jun-ichi Nishida、Martin R. Bryce、Yoshiro Yamashita
DOI:10.1246/bcsj.20110255
日期:2012.1.15
Ladder-type heteroacenes based on indolodibenzothiophene have been synthesized. The route involved a regioselective twofold intramolecular acid-induced cyclization of the central bis(butylsulfinyl)phenyl unit onto the adjacent carbazole units, followed by dealkylation to give diindolobenzobisbenzothiophene (DIBBBT) derivatives. Importantly, this sequence proceeded efficiently in the presence of the chloro substituents which provided reactive sites for further π-extension of the DIBBBT core. The chloro derivative underwent twofold palladium-catalyzed Suzuki–Miyaura reactions with phenylboronic acid or 4-n-octylphenylboronic acid. Compounds have been characterized by 1H NMR spectroscopy, mass spectrometry, elemental analysis, optical spectroscopy, and solution electrochemical studies. Organic field-effect transistors (OFETs) have been constructed based on drop-cast thin films and the performances as p-type semiconductor are presented. The chloro derivative was also copolymerized with 9,9-dioctyl-2,7-fluorenylenediboronic acid bis(1,3-propanediol) ester to give the alternating copolymer which exhibits blue photoluminescence in solution and blue-green electroluminescence in a solution processed organic light-emitting diode (OLED).
基于吲哚二苯并硫醚的阶梯型杂苊已被合成。该合成路线涉及中央双(丁基亚磺酰)苯基单元与相邻的咔唑单元之间的区域选择性双重分子内酸诱导环化,随后进行去烷基化以生成二吲哚苯并双苯并硫醚(DIBBBT)衍生物。重要的是,这一过程在氯取代基存在的条件下进行得非常高效,这为DIBBBT核心的进一步π-扩展提供了反应位点。氯衍生物经过两次钯催化的铃木-宫浦反应,与苯硼酸或4-n-辛基苯硼酸反应。通过1H NMR光谱、质谱、元素分析、光谱学和溶液电化学研究等手段对化合物进行了表征。基于滴铸薄膜构建了有机场效应晶体管(OFET),并展示了其作为p型半导体的性能。氯衍生物还与9,9-二辛基-2,7-荧烯二硼酸-1,3-丙二醇酯共聚合,形成交替共聚物,该共聚物在溶液中表现出蓝色光致发光,而在溶液处理的有机发光二极管(OLED)中展现出蓝绿电致发光。