Issue 11, 2020

Electric-field control of single-molecule tautomerization


The electric field is an important parameter to vary in a single-molecule experiment, because it can directly affect the charge distribution around the molecule. Yet, performing such an experiment with a well-defined electric field for a model chemical reaction at an interface has proven to be extremely difficult. Here, by combining a graphene field-effect transistor and a gate-tunable scanning tunneling microscope (STM), we reveal how this strategy enables the intramolecular H atom transfer of a metal-free macrocycle to be controlled with an external field. Experiments and theory both elucidate how the energetic barrier to tautomerization decreases with increasing electric field. The consistency between the two results demonstrates the potential in using electric fields to engineer molecular switching mechanisms that are ubiquitous in nanoscale electronic devices.

Graphical abstract: Electric-field control of single-molecule tautomerization

Supplementary files

Article information

Article type
20 Dec 2019
21 Feb 2020
First published
25 Feb 2020
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2020,22, 6370-6375

Electric-field control of single-molecule tautomerization

S. Mangel, M. Skripnik, K. Polyudov, C. Dette, T. Wollandt, P. Punke, D. Li, R. Urcuyo, F. Pauly, S. J. Jung and K. Kern, Phys. Chem. Chem. Phys., 2020, 22, 6370 DOI: 10.1039/C9CP06868F

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