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研究报道一种电动分子马达
作者:小柯机器人 发布时间:2023/1/14 15:40:56

美国西北大学Stoddart, J. Fraser团队报道了一种电动分子马达。相关研究成果发表在2023年1月11日出版的国际学术期刊《自然》。

宏观电机继续对现代社会的几乎每一个方面产生巨大影响。因此,开发可由电力驱动的分子马达的研究非常有意义。

该文中,研究人员描述了一种基于[3]链的电分子马达,其中两个环双(对羟基对苯基)(CBPQT4+)环由溶液中的电驱动,以围绕50元环单向旋转。环的构造确保两个环在闪烁能量棘轮的引导下进行高度(85%)的单向运动,而两个环之间的相互作用产生了二维势能面(PES),与FOF1 ATP合成酶所示的相似。单向性由振荡电压或氧化还原电位的外部调节提供动力。

最初,研究人员将注意力集中在同源的[2]连环上,但发现动力学不对称性不足以支持单环的单向运动。因此,引入了第二个CBPQT4+环,以通过两个移动环之间的相互作用产生进一步的对称破坏。这种电动驱动的两个环围绕[3]连环环中的一个环的连续旋转运动的演示不产生废物,代表了获得表面结合电动分子马达的重要一步。

附:英文原文

Title: An electric molecular motor

Author: Zhang, Long, Qiu, Yunyan, Liu, Wei-Guang, Chen, Hongliang, Shen, Dengke, Song, Bo, Cai, Kang, Wu, Huang, Jiao, Yang, Feng, Yuanning, Seale, James S. W., Pezzato, Cristian, Tian, Jia, Tan, Yu, Chen, Xiao-Yang, Guo, Qing-Hui, Stern, Charlotte L., Philp, Douglas, Astumian, R. Dean, Goddard, William A., Stoddart, J. Fraser

Issue&Volume: 2023-01-11

Abstract: Macroscopic electric motors continue to have a large impact on almost every aspect of modern society. Consequently, the effort towards developing molecular motors1,2,3 that can be driven by electricity could not be more timely. Here we describe an electric molecular motor based on a [3]catenane4,5, in which two cyclobis(paraquat-p-phenylene)6 (CBPQT4+) rings are powered by electricity in solution to circumrotate unidirectionally around a 50-membered loop. The constitution of the loop ensures that both rings undergo highly (85%) unidirectional movement under the guidance of a flashing energy ratchet7,8, whereas the interactions between the two rings give rise to a two-dimensional potential energy surface (PES) similar to that shown by FOF1 ATP synthase9. The unidirectionality is powered by an oscillating10 voltage11,12 or external modulation of the redox potential13. Initially, we focused our attention on the homologous [2]catenane, only to find that the kinetic asymmetry was insufficient to support unidirectional movement of the sole ring. Accordingly, we incorporated a second CBPQT4+ ring to provide further symmetry breaking by interactions between the two mobile rings. This demonstration of electrically driven continual circumrotatory motion of two rings around a loop in a [3]catenane is free from the production of waste products and represents an important step towards surface-bound14 electric molecular motors.

DOI: 10.1038/s41586-022-05421-6

Source: https://www.nature.com/articles/s41586-022-05421-6

期刊信息
Nature:《自然》,创刊于1869年。隶属于施普林格·自然出版集团,最新IF:69.504
官方网址:http://www.nature.com/
 
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