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Surface‐enhanced Raman scattering of D ‐penicillamine on silver colloids
Author(s) -
LópezRamírez M. R.,
Arenas J. F.,
Otero J. C.,
Castro J. L.
Publication year - 2004
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.1138
Subject(s) - penicillamine , chemistry , raman spectroscopy , carboxylate , raman scattering , adsorption , spectral line , conformational isomerism , metal , sulfur , atom (system on chip) , crystallography , colloid , inorganic chemistry , molecule , stereochemistry , organic chemistry , optics , physics , astronomy , computer science , embedded system
The Raman spectra of D ‐penicillamine in H 2 O and D 2 O were recorded under different acidity conditions, together with the respective SERS spectra on silver colloids. Vibrational assignments of the spectra obtained are proposed. The analysis of the SERS spectra shows that two of the conformers of D ‐penicillamine are adsorbed at least in their dianionic forms, and a stable chemical bond is established between the sulfur atom and silver. Additionally, carboxylate and amino groups also interact with the metal. The p K a 2and p K a 3apparent values are decreased upon adsorption. Copyright © 2004 John Wiley & Sons, Ltd.