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arXiv 2006.13896physics.chem-ph
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光异构化耦合电子转移

Photoisomerization-coupled electron transfer

Jakub K. Sowa, Emily A. Weiss, Tamar Seideman

摘要:

光致变色分子结构构成了构建分子开关、传感器和存储器件的独特平台。它们最有前途的应用之一是作为光可切换的电子受体或供体单元。在这里,我们调查一个以前未探索的过程,我们假设可能会发生在这样的系统:超快电子转移引发的同时光异构化的供体或受体部分。我们提出了一个理论模型,这种现象,并与援助的DFT计算,将其应用到的情况下,二氢芘型光致变色分子供体。通过考虑波包动力学和光致异构化产率,我们表明,所涉及的两个过程,电子转移和光致异构化,一般是不可分割的,需要以统一的方式处理。最后,我们讨论了如何通过实验控制光异构化耦合电子转移的效率。

英文摘要:

Photochromic molecular structures constitute a unique platform for constructing molecular switches, sensors and memory devices. One of their most promising applications is as light-switchable electron acceptor or donor units. Here, we investigate a previously unexplored process that we postulate may occur in such systems: an ultrafast electron transfer triggered by a simultaneous photoisomerization of the donor or the acceptor moiety. We propose a theoretical model for this phenomenon and, with the aid of DFT calculations, apply it to the case of a dihydropyrene-type photochromic molecular donor. By considering the wavepacket dynamics and the photoisomerization yield, we show that the two processes involved, electron transfer and photoisomerization, are in general inseparable and need to be treated in a unified manner. We finish by discussing how the efficiency of photoisomerization-coupled electron transfer can be controlled experimentally.

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