Intramolecular photoinduced processes of newly synthesized dual zinc porphyrin-fullerene triad with flexible linkers
Intramolecular photoinduced processes of newly synthesized dual zinc porphyrin-fullerene triad with flexible linkers
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DOI：
10.1142/s1088424606000752
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发表时间：
2006-01-01
影响因子：
1.5
通讯作者：
Arai, Tatsuo
中科院分区：
文献类型：
--
作者：
El-Khouly, Mohamed E.;Hasegawa, Jun;Arai, Tatsuo
锌卟啉-富勒烯-锌卟啉三联体是由两个锌卟啉（ZnP）部分和一个富勒烯（C11）部分通过柔性键连接而成的，它有望成为光合作用天线反应中心的工作模型。用时间分辨发射和瞬态吸收技术研究了它的物理性质。激发三单元组的锌卟啉部分诱导电荷分离，产生自由基离子对，其中电子定位在C1部分上，空穴定位在锌卟啉部分上。在极性溶剂中，电荷分离状态衰减的寿命为300600 ns返回到基态。与ZnP-C-60二联体相比，ZnP-C-60-ZnP三联体由于两个ZnP部分的构象而显示出更长的自由基离子对寿命。研究了配位试剂对锌原子的影响，并期望两个ZnP部分相对于C-60的构象变化。版权所有（c）2006年卟啉和酞菁协会。
Zinc porphyrin-fullerene-zinc porphyrin triad, in which two zinc porphyrin (ZnP) moieties and a fullerene (C,,) moiety are linked by flexible bonds and which is intended to be a working model of the photosynthetic antenna-reaction centre, has been newly synthesized. Its photophysical properties have been investigated by both time-resolved emission and transient absorption techniques. Excitation of the zinc porphyrin moiety of the triad induced charge separation, generating the radical ion pair, in which the electron localizes on the C, moiety and the hole localizes on the zinc porphyrin moiety. In polar solvents, the charge-separated states decayed with lifetimes of 300600 ns returning to the ground state. Compared with ZnP-C-60 dyad, ZnP-C-60-ZnP triad showed longer lifetimes for the radical ion pair due to the conformation of the two ZnP moieties. The effects of the coordinating reagents on the zinc atom have been studied, with the expectation of conformational change of the two ZnP moieties with respect to C-60. Copyright (c) 2006 Society of Porphyrins & Phthalocyanines.