Abstract
Hydrogen bonds are the path through which protons and hydrogen atoms can be transferred between molecules. The relay mechanism, in which H-atom transfer occurs in a sequential fashion along hydrogen bonds, plays an essential role in many functional compounds. Here we use the scanning tunnelling microscope to construct and operate a test-bed for real-space observation of H-atom relay reactions at a single-molecule level. We demonstrate that the transfer of H-atoms along hydrogen-bonded chains assembled on a Cu(110) surface is controllable and reversible, and is triggered by excitation of molecular vibrations induced by inelastic tunnelling electrons. The experimental findings are rationalized by ab initio calculations for adsorption geometry, active vibrational modes and reaction pathway, to reach a detailed microscopic picture of the elementary processes.
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Acknowledgements
We thank the Supercomputer Center, Institute for Solid State Physics, University of Tokyo, and the Information Technology Center, University of Tokyo, for the use of the facilities. H.O. was supported in part by the Grant-in-Aid for Scientific Research on Priority Areas ‘Molecular Science for Supra Functional Systems’ from the Ministry of Education, Culture, Sports, Science and Technology, Japan. I.H. was supported by the Grant-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan (No. 21740228). H.U. was supported by the Grant-in-Aid for Scientific Research B (No. 18340085) from the Japan Society for the Promotion of Science (JSPS). T.K. acknowledges the support of the JSPS.
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T.K. and H.O. designed and planned the experiments. T.K. and A.S. measured and analysed the STM data. I.H. performed the STATE calculations. T.F. performed the VASP calculations. H.O. supervised the project and H.U. provided guidance for the analysis completed by I.H. and T.F. All authors contributed to the discussion of the results. H.O., I.H., T.F. and H.U. wrote the paper.
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Kumagai, T., Shiotari, A., Okuyama, H. et al. H-atom relay reactions in real space. Nature Mater 11, 167–172 (2012). https://doi.org/10.1038/nmat3176
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DOI: https://doi.org/10.1038/nmat3176
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