Adsorption of Phosphonic-Acid-Functionalized Porphyrin Molecules on TiO2(110)
| Autor: | Tulio C. R. Rocha, Federico José Williams, Cynthia Carolina Fernández, Ole Lytken, Hans-Peter Steinrück, Daniel Wechsler |
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| Rok vydání: | 2019 |
| Předmět: |
02 engineering and technology
010402 general chemistry 01 natural sciences NEXAFS purl.org/becyt/ford/1 [https] chemistry.chemical_compound Adsorption Deprotonation Tetraphenylporphyrin purl.org/becyt/ford/1.4 [https] surface Molecule Physical and Theoretical Chemistry 021001 nanoscience & nanotechnology Phosphonate Porphyrin XANES 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystallography General Energy chemistry Absorption (chemistry) 0210 nano-technology porphyrin |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.9b01019 |
| Popis: | We studied the adsorption geometry and bonding of mono- and tetraphosphonic-acid-functionalized tetraphenylporphyrin molecules on rutile TiO2(110) surfaces. The investigation was carried out by means of X-ray photoelectron spectroscopy and near edge X-ray absorption fine structure (NEXAFS) measurements. We found that the molecules bind covalently to the surface in a mixed monodentate and bidentate mode implying deprotonation of one or two phosphonate hydroxyl groups. Our NEXAFS data suggest that molecules containing one functional phosphonic acid group are on average tilted further away from the surface than molecules with four functional groups. The highest occupied electronic state of both molecules is in the band gap at 2.1 eV below the Fermi level. Our results demonstrate that the number of functional phosphonic acid groups determine the adsorption geometry of tetraphenylporphyrins. Fil: Fernández, Cynthia Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina Fil: Wechsler, Daniel. Universitat Erlangen-Nuremberg; Alemania Fil: Rocha, Tulio C. R.. Brazilian Center for Research on Energy and Materials ; Brasil Fil: Steinrück, Hans-Peter. Universitat Erlangen-Nuremberg; Alemania Fil: Lytken, Ole. Universitat Erlangen-Nuremberg; Alemania Fil: Williams, Federico José. Universitat Erlangen-Nuremberg; Alemania. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química, Física de los Materiales, Medioambiente y Energía. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química, Física de los Materiales, Medioambiente y Energía; Argentina |
| Databáze: | OpenAIRE |
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