Donor–Acceptor Polymers: A Conjugated Oligo(p-Phenylene Vinylene) Main Chain with Dangling Perylene Bisimides
作者:Edda E. Neuteboom、Paul A. van Hal、René A. J. Janssen
DOI:10.1002/chem.200400097
日期:2004.8.20
temperatures. A strong fluorescence quenching of both chromophores indicates an efficient photoinduced charge transfer after photoexcitation of either donor or acceptor. The formation and recombination kinetics of the charge-separated state were investigated in detail with femtosecond and near-steady-state photoinduced absorption spectroscopy. The charge-separated state forms within 1 ps after excitation
通过使用Suzuki交叉偶联聚合反应,已合成了两种新的供体-受体共聚物,它们由对映体纯的低聚对苯撑亚乙烯基主链与悬挂的per双酰亚胺组成。吸收和圆二色性光谱显示,即使在高温下,主链中供体的过渡偶极矩与共聚物的悬空受体部分也以螺旋取向偶联并成螺旋取向。两个生色团的强烈荧光猝灭表明在供体或受体光激发后有效的光诱导电荷转移。用飞秒和近稳态光致吸收光谱法详细研究了电荷分离态的形成和复合动力学。激发后1 ps内形成电荷分离状态,并且在溶液和固态下均以45-60 ps的时间常数发生重组。这些光学特性表明富电子供体链和悬挂的贫电子受体发色团之间的距离短且有明显的相互作用。