Star-shaped donor-pi-acceptor conjugated molecules: synthesis, properties, and modification of their absorptions features.
Star-shaped donor-pi-acceptor conjugated molecules: synthesis, properties, and modification of their absorptions features.
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DOI：
10.1021/jo100388c
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
Zhengming Tang;T. Lei;Jin-Liang Wang;Yuguo Ma;J. Pei
中科院分区：
文献类型：
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作者：
Zhengming Tang;T. Lei;Jin-Liang Wang;Yuguo Ma;J. Pei
通过简单的合成路线，以不同比例引入三苯胺(TPA)为电子给体，2-dicyanomethylen-3-cyano-4，5，5-trimethyl-2，5-dihydrofuran(Tcf)为电子受体，构建了具有广谱吸收特征的星形给电子体-PI受体元共轭体系。光物理性质的研究表明，这些化合物的吸收带覆盖了300-800 nm的整个可见光范围。例如，在薄膜中，D1A2T2的吸收起始波长约为780 nm，峰值位于606 nm。稳态和瞬时发射光谱表明，这些化合物在这样的偏共轭体系中存在分子内的能量转移，这进一步得到了我们的计算研究的支持。我们的系统结构变化使我们深入了解D-pi-A体系的光学性质的调节策略，并为我们提供了一系列广泛的吸收分子。
Well-defined star-shaped donor-pi-acceptor meta-conjugated systems with broad absorption features were constructed through facilely synthetic routes, in which triphenylamine (TPA) moiety as an electron donor and 2-dicyanomethylen-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF) unit as an electron acceptor were introduced in various ratios. The investigation of the photophysical properties indicated that the absorption bands of these compounds covered the whole visible range from 300 to 800 nm. For instance, the absorption onset of D1A2T2 was located at about 780 nm and peaked at 606 nm in thin film. The steady and transient emission spectra showed that these compounds possess an intramolecular energy transfer in such a meta-conjugation system, which was further supported by our computational investigation. Our systematic structural variation provides us insight into the tuning strategy of optical properties in D-pi-A systems and offered us a series of broad absorption molecules.