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光触发轮烷中的分子穿梭：对接近度和电荷复合的控制。

Light triggers molecular shuttling in rotaxanes: control over proximity and charge recombination.

作者信息

Wolf Maximilian, Ogawa Ayumu, Bechtold Mareike, Vonesch Maxime, Wytko Jennifer A, Oohora Koji, Campidelli Stéphane, Hayashi Takashi, Guldi Dirk M, Weiss Jean

机构信息

Friedrich-Alexander-Universität Erlangen-Nürnberg , Department of Chemistry and Pharmacy , Egerlandstraße 3 , 91058 Erlangen , Germany . Email:

Department of Applied Chemistry , Graduate School of Engineering , Osaka University , 2-1 Yamadaoka , Suita 565-0871 , Japan . Email:

出版信息

Chem Sci. 2019 Feb 27;10(13):3846-3853. doi: 10.1039/c8sc05328f. eCollection 2019 Apr 7.

DOI:10.1039/c8sc05328f
PMID:30996970
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6446966/
Abstract

We present the synthesis of novel rotaxanes based on mechanically interlocked porphyrins and fullerene and their advanced investigations by means of photophysical measurements. To this end, a fullerene-capped dumbbell-type axle containing a central triazole was threaded through strapped (metallo)porphyrins-either a free-base or a zinc porphyrin. Femtosecond-resolved transient absorption measurements revealed charge-separation between the porphyrin and fullerene upon light excitation. Solvent polarity and solvent coordination effects induced molecular motion of the rotaxanes upon charge separation and enabled, for the first time, subtle control over the charge recombination by enabling and controlling the directionality of shuttling.

摘要

我们展示了基于机械互锁卟啉和富勒烯的新型轮烷的合成及其通过光物理测量进行的深入研究。为此，一个含有中心三唑的富勒烯封端哑铃型轴穿过带状（金属）卟啉——即游离碱卟啉或锌卟啉。飞秒分辨瞬态吸收测量表明，光激发后卟啉和富勒烯之间发生了电荷分离。溶剂极性和溶剂配位效应在电荷分离时诱导了轮烷的分子运动，并首次通过实现和控制穿梭的方向性，对电荷复合进行了精细控制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/db9e/6446966/2268b7795ea0/c8sc05328f-f7.jpg
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