Surface-enhanced Raman scattering of 3-phenylpropionic acid (hydrocinnamic acid)

Raman and surface‐enhanced Raman scattering (SERS) spectra of 3‐phenylpropionic acid on silver colloids at several concentrations and pH values were recorded. The analysis of the spectra indicated that 3‐phenylpropionic acid links to the metal through its carboxylate group, keeping the aromatic ring...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2002-06, Vol.33 (6), p.455-459
Main Authors: Castro, J. L., López Ramírez, M. R., López Tocón, I., Otero, J. C.
Format: Article
Language:English
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Summary:Raman and surface‐enhanced Raman scattering (SERS) spectra of 3‐phenylpropionic acid on silver colloids at several concentrations and pH values were recorded. The analysis of the spectra indicated that 3‐phenylpropionic acid links to the metal through its carboxylate group, keeping the aromatic ring almost perpendicular to the surface. Moreover, the acid undergoes an α, β‐dehydrogenation in some extension in such a way that the recorded SERS is the result of the competitive adsorption of 3‐phenylpropionic and trans‐cinnamic acids. Likewise, the contribution of the charge‐transfer mechanism to the enhancement of the SERS of 3‐phenylpropionic acid was estimated, making evident its important participation in the enhancement of modes 6a, 9a and 8a. Copyright © 2002 John Wiley & Sons, Ltd.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.853