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首页> 外文期刊>Chemistry: A European journal >Synthesis and Photoinduced Intramolecular Processes of Light-Harvesting Silicon Phthalocyanine–Naphthalenediimide–Fullerene Connected Systems
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Synthesis and Photoinduced Intramolecular Processes of Light-Harvesting Silicon Phthalocyanine–Naphthalenediimide–Fullerene Connected Systems

机译：集光酞菁硅-萘二酰亚胺-富勒烯连接体系的合成及光诱导的分子内过程

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摘要

Photoinduced intramolecular processes of a newly synthesized pentad composed of silicon phthalocyanine (SiPc) that is connected with two units of naphthalenediimide (NDI) and fullerene C60 to form SiPc-(NDI)_2- (C_60)_2 have been studied and the results are compared with the reference compounds, namely, the SiPc-(NDI)_2 triad and NDI-C60 dyad. Upon photoexcitation, the main quenching pathway in polar solvents involved electron transfer via the singlet excited states of SiPc-(NDI)_2-(C_60)_2 and SiPc-(NDI)_2, but not NDI-C_60 for which the energy transfer is dominant. The occurrence of electron-transfer processes of SiPc- (NDI)_2-(C_60)_2 and SiPc-(NDI)_2 were studied by time-resolved emission and transient absorption techniques and confirmed by redox measurements and molecular orbital calculations with ab initio B3LYP/3–21G(*) methods. Fast and efficient charge-separation processes via the singlet excited states of NDI and SiPc were monitored, followed by charge recombination to populate the C60 and SiPc triplet states. The lifetimes of charge-separated states were estimated as 1000 and 250 ps for SiPc- (NDI)_2-(C_60)_2 and SiPc-(NDI)_2, ACHTUNGTRENUNGrespectively.
机译：研究了由酞菁硅（SiPc）与萘二酰亚胺（NDI）和富勒烯C60两个单元连接形成SiPc-（NDI）_2-（C_60）_2的新合成五单元化合物的光诱导分子内过程。与参考化合物，即SiPc-（NDI）_2三元组和NDI-C60二元组。光激发时，极性溶剂中的主要淬灭途径涉及通过SiPc-（NDI）_2-（C_60）_2和SiPc-（NDI）_2的单重激发态进行电子转移，但不涉及能量转移占主导的NDI-C_60 。通过时间分辨发射和瞬态吸收技术研究了SiPc-（NDI）_2-（C_60）_2和SiPc-（NDI）_2电子转移过程的发生，并通过从头算起B3LYP的氧化还原测量和分子轨道计算来证实/ 3–21G（*）方法。通过NDI和SiPc的单重激发态监测快速有效的电荷分离过程，然后进行电荷重组以填充C60和SiPc三重态。对于SiPc-（NDI）_2-（C_60）_2和SiPc-（NDI）_2，ACTHUNGTRENUNG，电荷分离态的寿命分别估计为1000和250 ps。

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