Physics 版 (精华区)
发信人: zjliu (秋天的萝卜), 信区: Physics
标 题: 力学互锁的分子转子中的单向旋转
发信站: 哈工大紫丁香 (Thu Jul 10 13:55:28 2003)
http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v424/n6945/ab
s/nature01758_fs.html
Unidirectional rotation in a mechanically interlocked molecular rotor
DAVID A. LEIGH*, JENNY K. Y. WONG*, FRAN?OIS DEHEZ? & FRANCESCO ZERBETTO?
* School of Chemistry, University of Edinburgh, The King's Buildings, West
Mains Road, Edinburgh EH9 3JJ, UK
? Dipartimento di Chimica 'G. Ciamician', Universita degli Studi di
Bologna, via F. Selmi 2, 40126 Bologna, Italy
Correspondence and requests for materials should be addressed to D.A.L.
(David.Leigh@ed.ac.uk).
Molecular motor proteins are ubiquitous in nature and have inspired
attempts to create artificial machines 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 120°
intramolecular rotation around a single bond; another is a molecule capable
of repetitive unimolecular rotation driven by multiple and successive
isomerization of its central double bond. 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 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. 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.
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