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Title
Japanese: 
English:Single-Molecule Observation of Redox Reactions Enabled by Rigid and Isolated Tripodal Molecules 
Author
Japanese: Y. Kobayashi, Y. Yokota, R. A. Wong, M. Hong, J. Takeya, S. Osawa, 石割 文崇, 庄子 良晃, T. Harimoto, K. Sugimoto, Y. Ishigaki, T. Suzuki, 福島 孝典, Y. Kim.  
English: Y. Kobayashi, Y. Yokota, R. A. Wong, M. Hong, J. Takeya, S. Osawa, F. Ishiwari, Y. Shoji, T. Harimoto, K. Sugimoto, Y. Ishigaki, T. Suzuki, T. Fukushima, Y. Kim.  
Language English 
Journal/Book name
Japanese: 
English:The Journal of Physical Chemistry C 
Volume, Number, Page Vol. 127    No. 1    Page 746-758
Published date Dec. 15, 2022 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://pubs.acs.org/doi/10.1021/acs.jpcc.2c07362
 
DOI https://doi.org/10.1021/acs.jpcc.2c07362
Abstract Tracking various chemical reactions, including electrochemical and photochemical reactions at the single-molecule level, is expected to yield a great deal of knowledge from both fundamental and applied aspects. In this study, we report on a methodology to track the electronic-state changes of redox reactions at the single-molecule level by using electrochemical scanning tunneling microscopy (EC-STM). EC-STM is powerful for single-molecule analysis of redox reactions, but previous studies have shown difficulties separating the structural and electronic contributions due to orientational changes during the redox reaction. Here, we visualize the electronic-state changes of a single ferrocene associated with redox reactions using EC-STM by synthesizing and fabricating a monolayer of structurally rigid tripodal molecules based on triptycene, which act as ideal anchors to preserve a constant distance between the electrode and the ferrocene moieties. This methodology paves the way for versatile single-molecule measurements of important phenomena at the solid–liquid interface, such as photochemistry and heterogeneous catalysis.

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