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- Title
SERS spectrum of red dyes in the Mapuche belts from the beginning of the XXth century.
- Authors
Campos‐Vallette, M. M.; Rodríguez, M. J.; Chapanoff, M. A.; Clavijo, E.; Gómez‐Jeria, J. S.; Aliaga, A. E.; Jara, G. P.; Celis, F.; Paipa, C.; Leyton, P.
- Abstract
Red dyes in seven belts ( trariwe) belonging to the Mapuche culture, dated as beginning of the XXth century and stored in Museo Regional de la Araucanía, Chile, were studied by using ultraviolet-visible, liquid chromatography coupled to mass spectrometry, Raman and Surface Enhanced Raman Scattering spectroscopies. Red dyes were extracted and analysed; the spectral analysis allowed identifying that the principal red dye in five samples is highly consistent with a commercial synthetic aniline, the azopigment PR57. Another monoazopigment, an orange benzimidazolone, was identified in two samples. A molecular model for the PR57/Ag surface interaction supports the idea that the dye mainly exposes to the metal the carboxylate and sulphonate groups; the red azopigment is oriented rather tilted with the two aromatic rings being almost coplanar to the surface. The electrostatic interactions are the main factor of the PR57/Ag layer interaction. Copyright © 2017 John Wiley & Sons, Ltd.
- Subjects
CHILE; SERS spectroscopy; DYES &; dyeing; ULTRAVIOLET-visible spectroscopy; LIQUID chromatography; ELECTROSTATIC interaction
- Publication
Journal of Raman Spectroscopy, 2017, Vol 48, Issue 7, p958
- ISSN
0377-0486
- Publication type
Article
- DOI
10.1002/jrs.5147