SERS spectrum of gallic acid obtained from a modified silver colloid
Author
dc.contributor.author
Garrido, C.
Author
dc.contributor.author
Díaz Fleming, Guillermo
Author
dc.contributor.author
Campos Vallette, Marcelo
Admission date
dc.date.accessioned
2016-10-24T13:48:19Z
Available date
dc.date.available
2016-10-24T13:48:19Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 163 (2016) 68–72
es_ES
Identifier
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10.1016/j.saa.2016.03.028
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/140929
Abstract
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Two different crystals of the gallic acid were microscopically separated from a p.a. commercial product. The Raman spectra analysis allowed distinguishing monomeric and dimeric structures. The vibrational wave numbers were computed using DFT quantum chemical calculations. The data obtained from wave number calculations are used to assign vibrational bands obtained in the Raman spectrum. The dimer, characterized as ellagic acid, involves the carboxyl and hydroxyl moieties. The Raman spectrum in Water solution of each species is dominated by the monomeric form. A low negatively charged Ag colloid allowed obtain to the best of our knowledge, the first surface enhanced Raman scattering (SERS) spectrum of the gallic acid. The possible electrophilic attacking sites of the title molecule are identified using MEP surface plot study and the orientation of the analyte on the metal surface is proposed tilted to the surface.