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Anomalous surface‐enhanced Raman scattering of aromatic aldehydes and carboxylic acids
Author(s) -
Machado N. F. L.,
Marques M. P. M.,
Batista de Carvalho L. A. E.,
Castro J. L.,
Otero J. C.
Publication year - 2017
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.5051
Subject(s) - chemistry , raman scattering , raman spectroscopy , carboxylate , benzaldehyde , chromone , silver nanoparticle , adsorption , spectral line , group (periodic table) , photochemistry , nanoparticle , analytical chemistry (journal) , organic chemistry , catalysis , materials science , nanotechnology , optics , physics , astronomy
Raman and SERS spectra of benzaldehyde (Bz‐CHO) and chromone‐3‐carboxaldehyde (Ch‐CHO) on silver colloids have been analyzed, being subsequently compared to the spectra of the corresponding acids. In the SERS spectra of both aldehydes, the band corresponding to the ν(CO) stretching mode of the carboxaldehyde group at ca . 1700 cm −1 is missing, while a new band at 1350–1400 cm −1 , characteristic of the symmetric stretching mode of carboxylate group, is appearing in both cases. These results point out that aldehydes are oxidized to their corresponding acids when adsorbed on silver nanoparticles. This conclusion has been confirmed by means of HPLC‐MS analysis and supported on the basis of DFT calculations. Copyright © 2016 John Wiley & Sons, Ltd.