Controlling intramolecular hydrogen transfer in a porphycene molecule with single atoms or molecules located nearby

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Abstract

Although the local environment of a molecule can play an important role in its chemistry, rarely has it been examined experimentally at the level of individual molecules. Here we report the precise control of intramolecular hydrogen-transfer (tautomerization) reactions in single molecules using scanning tunnelling microscopy. By placing, with atomic precision, a copper adatom close to a porphycene molecule, we found that the tautomerization rates could be tuned up and down in a controlled fashion, surprisingly also at rather large separations. Furthermore, we extended our study to molecular assemblies in which even the arrangement of the pyrrolic hydrogen atoms in the neighbouring molecule influences the tautomerization reaction in a given porphycene, with positive and negative cooperativity effects. Our results highlight the importance of controlling the environment of molecules with atomic precision and demonstrate the potential to regulate processes that occur in a single molecule.

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Figure 1: Porphycene molecules on a Cu(110) surface.
Figure 2: STM-induced tautomerization of single porphycene molecules.
Figure 3: Controlling tautomerization by single adatoms.
Figure 4: Potential well deformation by a single copper atom.
Figure 5: Cooperativity in switching single molecules within assemblies.

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Acknowledgements

We thank R. Ernstorfer for careful reading of the manuscript, the Japan Society for the Promotion of Science (T.K.), the German Science Foundation (SFB 658), the European Union (AtMol and ARTIST), the Polish National Science Centre (3550/B/H03/2011/40) and VR (M.P.) for financial support and EPSRC (EP/F067496) through MCC, SNIC and PRACE for computer resources at HECTOR and PDC Center for High Performance Computing.

Author information

T.K. and L.G. conceived the experiments and discussed the results. T.K. performed the STM measurements and analysed the data. F.H., J.S., K.K. and M.P. carried out the DFT calculations. S.G. and J.W. provided the molecules. T.K., M.P. and L.G. wrote the paper.

Correspondence to Leonhard Grill.

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Kumagai, T., Hanke, F., Gawinkowski, S. et al. Controlling intramolecular hydrogen transfer in a porphycene molecule with single atoms or molecules located nearby. Nature Chem 6, 41–46 (2014) doi:10.1038/nchem.1804

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