Plasmonic Scissors for Molecular Design |
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| Authors: | Prof. Mengtao Sun Dr. Zhenglong Zhang Prof. Zee Hwan Kim Prof. Hairong Zheng Prof. Hongxing Xu |
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| Affiliation: | 1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603‐146, Beijing, 100190 (P. R. China);2. School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062 (P. R. China);3. Department of Chemistry, Korea University, Seoul 136‐701 (Korea) |
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| Abstract: | Heterogeneous catalysts play an important role in surface catalytic reactions, but selective bond breaking and control of reaction products in catalytic processes remain significant challenges. High‐vacuum tip‐enhanced Raman spectroscopy (HV‐TERS) is one of the best candidates to realize surface catalytic reactions. Herein, HV‐TERS was employed in a new method to control dissociation by using hot electrons, generated from plasmon decay, as plasmonic scissors. In this method, the N?N bond in 4,4′‐dimercaptoazobenzene was selectively dissociated by plasmonic scissors, and the reaction products formed from the radical fragment (SC6H5N) were controlled by varying the pH value. Under acidic conditions, p‐aminothiophenol was produced from the radical fragment by attachment of hydrogen ions, whereas under alkaline conditions, 4‐nitrobenzenethiol was obtained by attachment of oxygen ions to the substrate. |
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| Keywords: | chemoselectivity plasmon chemistry radical reactions Raman spectroscopy surface chemistry |
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