| dc.creator | Celis, Freddy | |
| dc.creator | Tirapegui, Cristian | |
| dc.creator | García, Macarena | |
| dc.creator | Aracena, Andrés | |
| dc.creator | Aliaga, Álvaro E. | |
| dc.creator | Campos-Vallette, Marcelo | |
| dc.date | 2020-07-18 | |
| dc.identifier | http://www.jcchems.com/index.php/JCCHEMS/article/view/1415 | |
| dc.description | 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 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.
| en-US |
| dc.format | application/pdf | |
| dc.language | eng | |
| dc.publisher | Sociedad Chilena de Química | en-US |
| dc.relation | http://www.jcchems.com/index.php/JCCHEMS/article/view/1415/400 | |
| dc.rights | Copyright (c) 2020 Journal of the Chilean Chemical Society | en-US |
| dc.rights | https://creativecommons.org/licenses/by-nc-sa/4.0 | en-US |
| dc.source | Journal of the Chilean Chemical Society; Vol 65 No 2 (2020): Journal of the Chilean Chemical Society; 4798-4803 | en-US |
| dc.source | 0717-9707 | |
| dc.source | 0717-9324 | |
| dc.subject | Ancient thread | en-US |
| dc.subject | Indigo | en-US |
| dc.subject | Leuco-Indigo | en-US |
| dc.subject | Raman | en-US |
| dc.subject | SERS | en-US |
| dc.title | IDENTIFICATION OF COEXISTING INDIGO SPECIES IN AN ANCIENT GREEN THREAD USING DIRECT PLASMON-ENHANCED RAMAN SPECTROSCOPY | en-US |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
