ADSORPTION OF PYRAZINE ON AU(111) AND AG(111) - ON THE ROLE OF THE ELECTRONIC FACTOR

[摘要] XPS and AES investigations of the emersed Au(111) and Ag(111) electrodes have revealed that pyrazine is more weakly adsorbed on Ag than on Au. Whereas on Au, pyrazine is firmly bound on the surface and the increase in the positive charge of the electrode brings about the increase in the organic surface excess by changing the molecule orientation from a flat to a Vertical position being then involved in the subsequent anodic oxidation processes, its bond with silver is so weak that anions remove it easily from the surface. The different behavior of the two electrodes to the pyrazine adsorption has been explained in terms of electronic interactions.

[发布日期] 1995-07-20

[效力级别]  Proceedings Paper

[关键词] AUGER ELECTRON SPECTROSCOPY;CHEMISORPTION;GOLD;LOW INDEX SINGLE CRYSTAL SURFACES;MODELS OF SURFACE CHEMICAL REACTIONS;PYRAZINE;SILVER;SOLID-LIQUID INTERFACES X-RAY PHOTOELECTRON SPECTROSCOPY