Journal
JOURNAL OF RAMAN SPECTROSCOPY
Volume 48, Issue 3, Pages 413-417Publisher
WILEY
DOI: 10.1002/jrs.5051
Keywords
SERS; aldehyde; carboxylic acid; oxidation; nanoparticles
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Funding
- Spanish/EU MINECO/FEDER [CTQ2015-65816-R]
- Portuguese Foundation for Science and Technology [UID/MULTI/00070/2013]
- Centre for the Research and Technology of Agro-Environmental and Biological Sciences, Portugal [BI/CITAB/UTAD/QUI/2015]
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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.(C =O) stretching mode of the carboxaldehyde group at ca. 1700cm (-1) ismissing, while a newband at 13501400cm(-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 acidswhen adsorbed on silver nanoparticles. This conclusion has been confirmed by means of HPLC-MS analysis and supported on the basis of DFT calculations. Copyright (c) 2016 John Wiley & Sons, Ltd.
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