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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Sequential charge separation in two axially linked phenothiazine- aluminum(III) porphyrin-fullerene triads
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Sequential charge separation in two axially linked phenothiazine- aluminum(III) porphyrin-fullerene triads

机译：两个轴向连接的吩噻嗪-铝（III）卟啉-富勒烯三联体中的顺序电荷分离

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摘要

New supramolecular triads (PTZpy→AlPor - C60, TPTZpy→AlPor - C60), containing aluminum(III) porphyrin (AlPor), fullerene (C60), and phenothiazine (phenothiazine = PTZ, 2-methylthiophenothaizine = TPTZ) have been constructed. In these triads the fullerene and phenothiazine units are bound axially to opposite faces of the porphyrin plane via covalent and coordination bonds, respectively. The ground-and excited-state properties of the triads and reference dyads are studied using steady-state and time-resolved spectroscopic techniques. The time-resolved data show that photoexcitation results in charge separation from the excited singlet state of the porphyrin to the C60 unit, generating (Donor)py→AlPor?+ - C60?-, Donor = PTZ and TPTZ. A subsequent hole shift from the porphyrin to phenothiazine generates the charge-separated state (Donor) ?+ py→AlPor - C60?-. The lifetime of the charge separation exhibits a modest increase from 39 ns in the absence of the donor to 100 ns in PTZpy→AlPor - C60 and 83 ns in TPTZpy→AlPor - C60. These lifetimes are discussed in terms of the electronic coupling between phenothiazine, the porphyrin, and C 60.
机译：已构建了新的超分子三元组（PTZpy→AlPor-C60，TPTZpy→AlPor-C60），其中包含铝（III）卟啉（AlPor），富勒烯（C60）和吩噻嗪（吩噻嗪= PTZ，2-甲基噻吩噻嗪= TPTZ）。在这些三单元组中，富勒烯和吩噻嗪单元分别通过共价键和配位键轴向结合到卟啉平面的相对面上。三元组和参考二元组的基态和激发态性质是使用稳态和时间分辨光谱技术研究的。时间分辨数据表明，光激发导致电荷从卟啉的激发单重态分离到C60单元，生成（Donor）py→AlPorα+-C60α-，施主= PTZ和TPTZ。随后的从卟啉到吩噻嗪的空穴转移产生电荷分离状态（Donor）δ+ py→AlPor-C60δ-。电荷分离的寿命从不存在供体的39 ns适度增加到PTZpy→AlPor-C60中的100 ns和TPTZpy→AlPor-C60中的83 ns。根据吩噻嗪，卟啉和C 60之间的电子偶联来讨论这些寿命。

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