Charge-Induced Structural Changes in a Single Molecule Investigated by Atomic Force Microscopy
| Autor: | Leo Gross, Philipp Scheuerer, Nikolaj Moll, Bruno Schuler, Jascha Repp, Laerte L. Patera, Fabian Queck, Felix Simbürger, Ingmar Swart |
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| Přispěvatelé: | Sub Condensed Matter and Interfaces, Condensed Matter and Interfaces |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
ddc:540 Relaxation (NMR) ddc:530 General Physics and Astronomy chemistry.chemical_element 530 Physik 01 natural sciences Redox Copper chemistry.chemical_compound Electron transfer chemistry Chemical physics Intramolecular force 540 Chemie 0103 physical sciences Phthalocyanine Molecule Density functional theory Physics::Chemical Physics 010306 general physics |
| Zdroj: | Physical Review Letters Physical Review Letters, 123(6). American Physical Society |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | Intramolecular structural relaxations occurring upon electron transfer are crucial in determining the rate of redox reactions. Here, we demonstrate that subangstrom structural changes occurring upon single-electron charging can be quantified by means of atomically resolved atomic force microscopy (AFM) for the case of single copper(II)phthalocyanine (CuPc) molecules deposited on an ultrathin NaCl film. Imaging the molecule in distinct charge states (neutral and anionic) reveals characteristic differences in the AFM contrast. In comparison to density functional theory simulations these changes in contrast can be directly related to relaxations of the molecule's geometric structure upon charging. The dominant contribution arises from a nonhomogeneous vertical relaxation of the molecule, caused by a change in the electrostatic interaction with the surface. |
| Databáze: | OpenAIRE |
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