Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 24, Pages 7101-7105Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201502153
Keywords
diffusion; molecular machines; nanomaterials; scanning tunneling microscopy; surface chemistry
Categories
Funding
- UK EPSRC [EP/J019844/1, EP/F00981X/1]
- MICINN [TEC2011-29140-C03-02]
- 973 Program [2011CB933300]
- National Natural Science Foundation of China [11328403, 51271134, J1210061]
- Fundamental Research Funds for the Central Universities
- China Equipment and Education Resources System [CERS-1-26]
- Engineering and Physical Sciences Research Council [1556562, EP/F00981X/1, EP/J019844/1, EP/J019364/1, EP/M005178/1] Funding Source: researchfish
- EPSRC [EP/J019364/1, EP/F00981X/1, EP/M005178/1, EP/J019844/1] Funding Source: UKRI
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An on-surface bimolecular system is described, comprising a simple divalent bis(imidazolyl) molecule that is shown to walk at room temperature via an inchworm mechanism along a specific pathway terminated at each end by oligomeric fences constructed on a monocrystalline copper surface. Scanning tunneling microscopy shows that the motion of the walker occurs along the [1 (1) over bar 0] direction of the Cu surface with remarkably high selectivity and is effectively confined by the orthogonal construction of covalent porphyrin oligomers along the [001] surface direction, which serve as barriers. Density functional theory shows that the mobile molecule walks by attaching and detaching the nitrogen atoms in its imidazolyl legs to and from the protruding close-packed rows of the metal surface and that it can transit between two energetically equivalent extended and contracted conformations by overcoming a small energy barrier.
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