| Autor: |
S. M. Gray, James N. O'Shea, J Schiessling, Joachim Schnadt, Paul A. Brühwiler, Petter Persson, P G Karlsson, Nils Mårtensson, John Åhlund, Ming Shi, Luc Patthey, J Krempaský, M. K. J. Johansson |
| Rok vydání: |
2003 |
| Předmět: |
|
| Zdroj: |
Surface Science. 540:39-54 |
| ISSN: |
0039-6028 |
| Popis: |
The adsorption of monolayers of the pyridine-carboxylic acid monomers (isonicotinic acid, nicotinic acid, and picolinic acid) on rutile TiO2(1 1 0) has been studied by means of X-ray photoemission spectroscopy. An investigation of the O 1s spectra shows that the molecular carboxylic groups are deprotonated and, hence, that the molecules bind to the surface in a bidentate mode. Moreover, the binding energy of those core levels that are related to the pyridine ring atoms shift as a function of molecule relative to the substrate O 1s and Ti 3p levels, while the position of the core levels related to emission from the carboxylic group are constant relative to the substrate levels. The molecule-dependent shifts are attributed to local intermolecular interactions that determine the proximity of adjacent molecular rings and thus the core-hole screening response of the neighbouring molecules. We propose a simple molecular arrangement for each case which satisfies the known constraints. (C) 2003 Elsevier B.V. All rights reserved. (Less) |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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