Structural study of adsorption of isonicotinic acid and related molecules on rutile TiO2(110) II: XPS

Summary, in English

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.

• Author: J Schnadt; JN O'Shea; L Patthey; J Schiessling; J Krempasky; M Shi; Nils Mårtensson; PA Bruhwiler
• Department/s: MAX IV Laboratory
• Publishing year: 2003
• Language: English
• Pages: 74-86
• Publication/Series: Surface Science
• Volume: 544
• Issue: 1
• Links: http://dx.doi.org/10.1016/j.susc.2003.08.013
• Document type: Journal article
• Publisher: Elsevier
• Topic: Natural Sciences; Physical Sciences
• Keywords: evaporation and sublimation; synchrotron radiation photoelectron spectroscopy; chemisorption; aromatics; titanium oxide; single crystal; surfaces
• Status: Published
• ISBN/ISSN/Other: ISSN: 0039-6028