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1 Polish Journal of Chemistry

1 2002

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Surface-Enhanced Raman Spectroscopy and Electrochemical studies of 4-Phenylpyridine Adsorption at the Silver/Solution Interface

Bukowska J., Calvo M., Jurkiewicz-Herbich M., Jackowska K.

Polish Journal of Chemistry

2002

Vol. 76 / nr 8

1151-1162

The adsorption of 4-phenylpyridine (4-PhPy) on silver was examined using conventional electrochemical techniques: cyclic voltammetry, impedance measurements and surface enhanced Raman spectroscopy (SERS) in a wide range of electrode potentials. Electrochemical results indicate a weaker adsorption of 4-PhPy molecules on Ag than on Au electrode, but considerably stronger than adsorption of pyridine. For saturated solutions the Raman results point out the reorientation of the 4-PhPy molecules from more flat configuration at potentials more positive than -0.7 V vs SCE, to more perpendicular one at more negative potentials. This reorientation may be connected with the formation of stable surface complexes at potentials more positive than -0.7 V and of molecular stacks at more negative electrode potentials.