A facile and efficient approach for the synthesis of new conjugated donor-π-acceptor (D-π-A) chromophores has been developed, in which benzodifuran (BDF) and/or triphenyl amine (TPA) units are the donor moieties, linked by ethylenic bridges to electron-deficient anthraquinone (AQ) and 11,11,12,12-tetracyano-9,10-anthraquinodimethane (TCAQ) as the acceptor moieties. The resultant triads either with a symmetric A–D–A or an asymmetric D′–D–A structure show intense absorption bands in the visible spectral region due to efficient intramolecular charge transfer (ICT) from the HOMO localized on the BDF core to the LUMO localized on the AQ or the TCAQ unit. Electronic interactions between these redox-active components were studied by a combination of cyclic voltammetry, spectroelectrochemistry, UV-visible and ultrafast transient absorption spectroscopy. Analysis of the femtosecond excited-state dynamics reveal that all triads undergo a rapid charge recombination process which occurs within a few picoseconds, indicating that ethylenic linkers can facilitate electron delocalization among BDF and AQ/TCAQ units and thus impart effective electronic interactions between them.

中文翻译：

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基于苯并二呋喃的三联体中的分子内电荷转移动力学

已经开发了一种合成新的共轭供体-π-受体 (D-π-A) 发色团的简便有效的方法，其中苯并二呋喃 (BDF) 和/或三苯胺 (TPA) 单元是供体部分，通过烯键连接到缺电子蒽醌 (AQ) 和 11,11,12,12-四氰基-9,10-蒽醌二甲烷 (TCAQ) 作为受体部分。由于有效的分子内电荷转移 (ICT) 从位于 BDF 核上的 HOMO 到LUMO 定位在 AQ 或 TCAQ 单元上。通过循环伏安法、光谱电化学、紫外-可见光和超快瞬态吸收光谱的组合研究了这些氧化还原活性组分之间的电子相互作用。