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首页> 外文期刊>Journal of photochemistry and photobiology, C. Photochemistry reviews >Dynamics of superexchange photoinduced electron transfer in duplex DNA
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Dynamics of superexchange photoinduced electron transfer in duplex DNA

机译:双交换DNA中超交换光诱导电子转移的动力学

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Photoinduced electron transfer (PET) in DNA can occur via one of two mechanisms, single-step superexchange and multi-step hole hopping. The dynamics of superexchange charge separation and charge recombination has recently been investigated in several structurally well-defined systems. In each of these systems, an electron acceptor is separated from a guanine or deazaguanine nucleobase donor by a variable number of A:T base pairs. The results of experimental studies on these and related systems are presented and analyzed within the framework of semi-classical electron transfer theory. Comparison of the results with those for other bridge-mediated electron transfer systems indicates that the π-stacked bases of DNA provide a better medium for electron transfer than the sigma bonded pathways of proteins and saturated hydrocarbons but do not function as a molecular wire.
机译:DNA中的光诱导电子转移(PET)可以通过两种机制之一发生,即单步超交换和多步空穴跳跃。最近在几个结构明确的系统中研究了超交换电荷分离和电荷重组的动力学。在这些系统的每一个中,电子受体通过可变数目的A:T碱基对与鸟嘌呤或脱氮鸟嘌呤核苷供体分开。在半经典电子转移理论的框架内,对这些及相关系统的实验研究结果进行了介绍和分析。将结果与其他桥介导的电子转移系统的结果进行比较表明,与蛋白质和饱和烃的sigma键合途径相比,DNA的π堆积碱基为电子转移提供了更好的介质,但没有充当分子导线。

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