Unidirectional rotation in a mechanically interlocked molecular rotor

被引:785
作者
Leigh, DA
Wong, JKY
Dehez, F
Zerbetto, F
机构
[1] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JJ, Midlothian, Scotland
[2] Univ Bologna, Dipartimento Chim G Ciamician, I-40126 Bologna, Italy
基金
美国国家科学基金会;
关键词
D O I
10.1038/nature01758
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Molecular motor proteins are ubiquitous in nature(1) and have inspired attempts to create artificial machines(2) that mimic their ability to produce controlled motion on the molecular level. A recent example of an artificial molecular rotor is a molecule undergoing a unidirectional 120degrees intramolecular rotation around a single bond(3,4); another is a molecule capable of repetitive unimolecular rotation driven by multiple and successive isomerization of its central double bond(5-8). Here we show that sequential and unidirectional rotation can also be induced in mechanically interlocked assemblies comprised of one or two small rings moving around one larger ring. The small rings in these [2]- and [3] catenanes(9) move in discrete steps between different binding sites located on the larger ring, with the movement driven by light, heat or chemical stimuli that change the relative affinity of the small rings for the different binding sites(10-12). We find that the small ring in the [2] catenane moves with high positional integrity but without control over its direction of motion, while the two rings in the [3] catenane mutually block each other's movement to ensure an overall stimuli-induced unidirectional motion around the larger ring.
引用
收藏
页码:174 / 179
页数:6
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