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Título: | Covalent Modification of Highly Ordered Pyrolytic Graphite withaStable OrganicFree Radical by UsingDiazonium Chemistry |
Autor: | Seber, Gonca CSIC ORCID; Rudnev, Alexander V.; Droghetti, Andrea CSIC ORCID CVN; Rungger, Ivan; Veciana, Jaume CSIC ORCID CVN; Mas Torrent, Marta CSIC ORCID; Rovira, Concepció CSIC ORCID; Crivillers, Núria CSIC ORCID | Palabras clave: | Diazonium compounds Electrochemistry Radicals Redox chemistry Surface chemistry |
Fecha de publicación: | 26-ene-2017 | Editor: | Wiley-VCH | Citación: | Chemistry - a European Journal 23(6): 1415–1421 (2017) | Resumen: | A novel, persistent, electrochemically active perchlorinated triphenylmethyl (PTM) radical with a diazonium functionality has been covalently attached to highly ordered pyrolytic graphite (HOPG) by electrografting in a single-step process. Electrochemical scanning tunneling microscopy (EC-STM) and Raman spectroscopy measurements revealed that PTM molecules had a higher tendency to covalently react at the HOPG step edges. The cross-section profiles from EC-STM images showed that there was current enhancement at the functionalized areas, which could be explained by redox-mediated electron tunneling through surface-confined redox-active molecules. Cyclic voltammetry clearly demonstrated that the intrinsic properties of the organic radical were preserved upon grafting and DFT calculations also revealed that the magnetic character of the PTM radical was preserved. | Versión del editor: | http://dx.doi.org/10.1002/chem.201604700 | URI: | http://hdl.handle.net/10261/145857 | DOI: | 10.1002/chem.201604700 | ISSN: | 0947-6539 |
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