Electrochemistry of complex molecular and biomolecular scale entities |
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Authors: | Christian Engelbrekt Dmitrii Glukhov Yueqi Li Renat R. Nazmutdinov Jing Tang Jens Ulstrup Zixiao Wang Xinxin Xiao Jiawei Yan Xiaomei Yan Tamara Zinkicheva |
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Affiliation: | 1. Department of Chemistry, Technical University of Denmark, Building 207, Kgs. Lyngby, Denmark;2. Kazan National Research Technological University, K. Marx Str. 68, 420015, Kazan, Republic of Tatarstan, Russian Federation;3. State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China;4. State Key Laboratory of Physical Chemistry of Solid Surfaces and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, PR China |
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Abstract: | Structural mapping of intermediate size and large molecules and biomolecules at ultra-high resolution using single-crystal electrodes and in situ scanning tunnelling microscopy continues to disclose surprising findings. In situ scanning tunnelling spectroscopy has also recently disclosed new electrochemical conductivity features at the level of the single molecule. We overview briefly elements of this development over the last few years, with focus on three recent discoveries: (1) a new packing mode of a core monolayer target thiol, the amino acid cysteine (Cys) on Au(100)-electrodes, quite different from Cys packing on Au(111)- and Au(110)-electrodes; (2) transition of a core ferrocene in situ scanning tunnelling spectroscopy probe from stochastic single-molecule to macroscopic behaviour, a concept at the heart of nanoscience; and (3) unexpected behaviour of the large molybdenum enzyme sulfite oxidase, when going from macroscopic to single-molecule electrochemistry. We compare these studies with other recent discoveries of single-molecule protein conductivity and molecular scale inorganic nanostructures. |
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Keywords: | Single-entity electrochemistry Scanning tunnelling spectroscopy Cysteine on Au(100) Stochastic conductivity of redox molecules Sulfite oxidase |
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