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dc.contributor.authorCelis, Freddy
dc.contributor.authorTirapegui, Cristian
dc.contributor.authorGarcía, Macarena
dc.contributor.authorAracena, Andrés
dc.contributor.authorAliaga, Álvaro. E.
dc.contributor.authorCampos-Vallette, Marcelo
dc.date.accessioned2020-09-22T13:26:30Z
dc.date.available2020-09-22T13:26:30Z
dc.date.issued2020-06-30
dc.identifier10.4067/S0717-97072020000204798
dc.identifier.issn07179324
dc.identifier.urihttps://hdl.handle.net/20.500.12728/6882
dc.description.abstractA 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.isoenes_ES
dc.publisherSociedad Chilena de Quimicaes_ES
dc.subjectAncient threades_ES
dc.subjectIndigoes_ES
dc.subjectLeuco-Indigoes_ES
dc.subjectRamanes_ES
dc.subjectSERSes_ES
dc.titleIdentification of coexisting indigo species in an ancient green thread using direct plasmon-enhanced Raman spectroscopyes_ES
dc.typeArticlees_ES


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