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Updated: Mar 23, 2026

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Control of Molecule-Metal Interaction by Hydrogen Manipulation in an Organic Molecule
Van Dong Pham1, Vincent Repain1, Cyril Chacon1
1Laboratoire Matériaux et Phénomènes Quantiques, CNRS-Université Paris 7 , 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France.
Abstract:
Free-base porphyrin molecules offer appealing options to tune the interaction with their environment via the manipulation of their inner hydrogen atoms and molecular conformation. Using scanning tunneling microscopy we show, through a systematic study, that the molecular conformation, electronic gap, wave function, and molecule-substrate interaction are modified by hydrogen switch or removal. Experimental results in combination with ab initio calculations provide an understanding of the underlying physical process.
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