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Identification of coexisting indigo species in an ancient green thread using direct plasmon-enhanced Raman spectroscopy
dc.contributor.author | Celis, Freddy | |
dc.contributor.author | Tirapegui, Cristian | |
dc.contributor.author | García, Macarena | |
dc.contributor.author | Aracena, Andrés | |
dc.contributor.author | Aliaga, Álvaro. E. | |
dc.contributor.author | Campos-Vallette, Marcelo | |
dc.date.accessioned | 2020-09-22T13:26:30Z | |
dc.date.available | 2020-09-22T13:26:30Z | |
dc.date.issued | 2020-06-30 | |
dc.identifier | 10.4067/S0717-97072020000204798 | |
dc.identifier.issn | 07179324 | |
dc.identifier.uri | https://hdl.handle.net/20.500.12728/6882 | |
dc.description.abstract | A green ancient thread sample from a Chilean mummy turban was analyzed by plasmon-enhanced Raman scattering spectroscopy using a direct drop-colloidal method. The enhanced-Raman signals in the sample are associated with biomolecules from the thread and two coexisting dyes, indigo and leuco-indigo. The presence of indigo (blue colour) was identified from its most characteristic vibrational bands. Leuco-indigo (yellow colour) was identified for the first time in an ancient textile; its SERS signals are coincident with the SERS bands of a synthesized leuco-indigo. The interconversion leuco-indigo to indigo was followed by UV-visible spectroscopy. Based on theoretical calculations it is proposed that the interconversion involves a π electron delocalization mainly around the NC-CN bridge. The mixture of both dyes (indigo and leuco-indigo) is the responsible for the green colour observed. | es_ES |
dc.language.iso | en | es_ES |
dc.publisher | Sociedad Chilena de Quimica | es_ES |
dc.subject | Ancient thread | es_ES |
dc.subject | Indigo | es_ES |
dc.subject | Leuco-Indigo | es_ES |
dc.subject | Raman | es_ES |
dc.subject | SERS | es_ES |
dc.title | Identification of coexisting indigo species in an ancient green thread using direct plasmon-enhanced Raman spectroscopy | es_ES |
dc.type | Article | es_ES |