A multistage rotational speed changing molecular rotor regulated by pH and metal cations.
A multistage rotational speed changing molecular rotor regulated by pH and metal cations.
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pH值和金属阳离子调节的多级变速分子转子
DOI:
10.1038/s41467-018-04323-4
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发表时间:
2018-05-16
影响因子:
16.6
通讯作者:
Wang Y
中科院分区:
文献类型:
--
作者:
Wu Y;Wang G;Li Q;Xiang J;Jiang H;Wang Y
Despite having significant applications in building nanomachines, molecular rotors with the rotational speed modulations to multiple stages in a wide range of frequency have not yet been well established. Here, we report the discovery of a stimuli-responsive molecular rotor, the rotational speed of which in the slow-to-fast range could be modulated to at least four stages triggered by acid/base and metal cations. The rotor itself rotates rapidly at ambient or elevated temperature but displays a restricted rotation after deprotonation due to the produced intramolecular electrostatic repulsion. Subsequent addition of Li+or Na+cations introduces an electrostatic bridge to stabilize the transition state of the deprotonated rotor, thus giving a cation-radius-dependent acceleration of the rotation to render the rotor running at a mid-speed. All the stimuli are highly reversible. Our studies provide a conceptual approach for constructing multistage rotational-speed-changing molecular rotors, and further, the practical nanomachines.
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