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Surface‐enhanced Raman scattering of 3‐phenylpropionic acid (hydrocinnamic acid)
Author(s) -
Castro J. L.,
López Ramírez M. R.,
López Tocón I.,
Otero J. C.
Publication year - 2002
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.853
Subject(s) - raman scattering , raman spectroscopy , carboxylate , chemistry , adsorption , cinnamic acid , metal , dehydrogenation , photochemistry , stereochemistry , organic chemistry , catalysis , optics , physics
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.