Authors: Li, Qiao-Xia¹; Xue, Xiao-Kang¹; Xu, Qun-Jie²; Cai, Wen-Bin³

Source: Applied Spectroscopy, Volume 61, Issue 12, Pages 274A-292A and 1265-1412 (December 2007) , pp. 1328-1333(6)

Publisher: Society for Applied Spectroscopy

Abstract:

In situ surface-enhanced infrared absorption spectroscopy (SEIRAS) was applied to investigate adsorption configurations of pyridine (Py) on platinum, palladium, ruthenium, and rhodium nanoparticle film electrodes. The results reveal that α-pyridyl species predominantly form on Pt electrodes by assuming an edge-on configuration with its ring N and α-C atoms bonding to the Pt surface, while on Ru and Rh electrodes pyridine molecules essentially remain intact by adopting a slightly edge-tilted configuration through bonding with its N lone pair electrons. Py adsorption on a Pd electrode may lie in between the above two cases; both α-pyridyl species and edge-tilted intact pyridine could be significantly present. Further comparison of the typical adsorption configurations on the above four electrodes with those on Ag, Au, Cu, Cd, and Ni film electrodes suggests that valence electrons and the periodic row of metals may play an important role in determining the adsorption configuration.

Keywords: PYRIDINE; ADSORPTION CONFIGURATION; SURFACE-ENHANCED INFRARED ABSORPTION SPECTROSCOPY; SEIRAS; PLATINUM ELECTRODES; RUTHENIUM ELECTRODES; RHODIUM ELECTRODES; PALLADIUM ELECTRODES

Document Type: Research article

DOI: http://dx.doi.org/10.1366/000370207783292091

Affiliations: 1: Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials, and Department of Chemistry, Fudan University, Shanghai 200433, China 2: Department of Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, China 3: Shanghai Key Laboratory for Molecular Catalysis and Innovative Materials, and Department of Chemistry, Fudan University, Shanghai 200433, China; Department of Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, Chin

Publication date: 2007-12-01

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