Synthesis, two-photon absorption, and optical power limiting of new linear and hyperbranched conjugated polyynes based on bithiazole and triphenylamine
作者:Yihua Jiang、Yaochuan Wang、Jiabao Yang、Jianli Hua、Bing Wang、Shiqiong Qian、He Tian
DOI:10.1002/pola.24608
日期:2011.4.15
Two new linear and hyperbranched conjugated polymers P1 and P2 have been synthesized by Sonogashira coupling reaction, in which the main chain consists of bithiazole moieties as electron acceptors and triphenylamino groups as donors. The conjugated polymers were characterized by TGA, UV–vis absorption, fluorescence emission, electrochemical cyclic voltammetry, and two‐photon absorption measurements
通过Sonogashira偶联反应合成了两种新的线性和超支化共轭聚合物P1和P2,其中主链由作为电子受体的噻唑部分和作为供体的三苯氨基组成。共轭聚合物的特征在于TGA,紫外可见吸收,荧光发射,电化学循环伏安法和双光子吸收测量。它们在有机溶剂中显示出极好的溶解性,并具有很高的热稳定性(299°C时重量损失的5%)。通过开孔Z扫描技术使用140飞秒(fs)脉冲测量的双光子吸收截面(σ)被确定为每个重复单元P1和P2分别为1014和552 GM, 分别。该结果表明,线性共轭P1的σ高于超支化P2的σ ,表明线性聚合物提供了更好的分子内电荷转移能力。在THF中,P1和P2在800 nm处140 fs脉冲的激发下表现出强烈的频率上变频荧光,其峰值分别位于580 nm和548 nm。同时,通过使用聚焦时间为140 fs的800 nm聚焦激光束研究了聚合物的光学极限行为。人们发现,这些聚合物还表现出良好