Adsorption Dynamics Of Imidazole And Imidazolium Ion On Copper And Silver Electrode Surfaces

B. H. Loo; Y. G. Lee; A. El-Hage

doi:10.1117/12.966917

1 January 1987 Adsorption Dynamics Of Imidazole And Imidazolium Ion On Copper And Silver Electrode Surfaces

B. H. Loo, Y. G. Lee, A. El-Hage

Proceedings Volume 0742, Laser Applications to Chemical Dynamics; (1987) https://doi.org/10.1117/12.966917
Event: OE LASE'87 and EO Imaging Symposium, 1987, Los Angeles, CA, United States

Abstract

Surface-enhanced Raman spectroscopy has been used to study the adsorption behavior of imidazole and imidazolium ions on Cu and Ag electrode surfaces under different applied potentials, pH's and concentrations of the solutions. At neutral or basic pH's the unprotonated imidazole is the predominant species adsorbed on the electrode surfaces. On the other hand, the surface adsorbates are predominantly protonated ones (imidazolium ions) in acidic solutions. In slightly acidic solutions, both the protonated and unprotonated forms are observed on the electrode surfaces and they are interconvertible, depending on the applied electrode potentials. At neutral or basic pH's, two different molecular orientations are identified on two different metal surfaces in dilute solutions of imidazole. The imidazole molecule is bonded through its electron pair on the N atom to the Cu electrode surface whereas it is bonded through the π-system to the Ag electrode surface. The adsorbed imidazolium ions are bonded through the π-system of the imidazole ring to both Cu and Ag electrode surfaces.

Citation Download Citation

B. H. Loo, Y. G. Lee, and A. El-Hage "Adsorption Dynamics Of Imidazole And Imidazolium Ion On Copper And Silver Electrode Surfaces", Proc. SPIE 0742, Laser Applications to Chemical Dynamics, (1 January 1987); https://doi.org/10.1117/12.966917

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