The natural dyes lawsone and plumbagin (1,4-naphthoquinones) were studied by using fluorescence, Raman, infrared (IR), surface-enhanced Raman scattering (SERS), and surface-enhanced IR absorption. From the absorption spectrum, it was possible to infer that the enol-lawsone tautomer concentration decreases in silver colloidal solution. Plumbagin dimers, both in water and in silver colloidal solution, were identified from the fluorescence band profile and surface-SERS spectrum. The SERS spectrum of lawsone was obtained by using silver colloidal solution after 12-hour settle; the keto and enol lawsone silver colloid interaction occurs. The assignment of Raman and IR bands of both dyes was calculated with density functional theory calculations. Only a monomeric structure of lawsone interacting with a silver cluster model was predicted. The monomer adopts a nearly coplanar orientation onto the silver surface; the shortest distance is 3.2 angstrom, suggesting an electrostatic interaction.
%0 Journal Article
%1 RN318
%A Aliaga, A.E.
%A Leyton, P.
%A Clavijo, R.E.
%A Campos-Vallette, M.M.
%D 2016
%J Spectroscopy Letters
%K 1,4-naphthoquinone, behavior, calculations, dqcauchile enhanced fluorescence, infrared-absorption, lawsone, nanoparticles, plumbagin, quinones raman raman-scattering, reduction, scattering, selection, sers, silver spectrum, surface theoretical
%N 5
%P 326-335
%R 10.1080/00387010.2016.1146772
%T Fluorescence and Surface-Enhanced Vibrational Spectroscopies of Lawsone and Plumbagin
%U /brokenurl#<Go to ISI>://WOS:000405754400002
%V 49
%X The natural dyes lawsone and plumbagin (1,4-naphthoquinones) were studied by using fluorescence, Raman, infrared (IR), surface-enhanced Raman scattering (SERS), and surface-enhanced IR absorption. From the absorption spectrum, it was possible to infer that the enol-lawsone tautomer concentration decreases in silver colloidal solution. Plumbagin dimers, both in water and in silver colloidal solution, were identified from the fluorescence band profile and surface-SERS spectrum. The SERS spectrum of lawsone was obtained by using silver colloidal solution after 12-hour settle; the keto and enol lawsone silver colloid interaction occurs. The assignment of Raman and IR bands of both dyes was calculated with density functional theory calculations. Only a monomeric structure of lawsone interacting with a silver cluster model was predicted. The monomer adopts a nearly coplanar orientation onto the silver surface; the shortest distance is 3.2 angstrom, suggesting an electrostatic interaction.
@article{RN318,
abstract = {The natural dyes lawsone and plumbagin (1,4-naphthoquinones) were studied by using fluorescence, Raman, infrared (IR), surface-enhanced Raman scattering (SERS), and surface-enhanced IR absorption. From the absorption spectrum, it was possible to infer that the enol-lawsone tautomer concentration decreases in silver colloidal solution. Plumbagin dimers, both in water and in silver colloidal solution, were identified from the fluorescence band profile and surface-SERS spectrum. The SERS spectrum of lawsone was obtained by using silver colloidal solution after 12-hour settle; the keto and enol lawsone silver colloid interaction occurs. The assignment of Raman and IR bands of both dyes was calculated with density functional theory calculations. Only a monomeric structure of lawsone interacting with a silver cluster model was predicted. The monomer adopts a nearly coplanar orientation onto the silver surface; the shortest distance is 3.2 angstrom, suggesting an electrostatic interaction.},
added-at = {2019-12-04T03:57:35.000+0100},
author = {Aliaga, A.E. and Leyton, P. and Clavijo, R.E. and Campos-Vallette, M.M.},
biburl = {https://www.bibsonomy.org/bibtex/2c623528da263e943f92b76cd0125a27b/dqcauchile},
doi = {10.1080/00387010.2016.1146772},
interhash = {2eabfc2ac1f7403bbf898b1c22038b3a},
intrahash = {c623528da263e943f92b76cd0125a27b},
issn = {0038-7010},
journal = {Spectroscopy Letters},
keywords = {1,4-naphthoquinone, behavior, calculations, dqcauchile enhanced fluorescence, infrared-absorption, lawsone, nanoparticles, plumbagin, quinones raman raman-scattering, reduction, scattering, selection, sers, silver spectrum, surface theoretical},
number = 5,
pages = {326-335},
timestamp = {2019-12-04T03:58:17.000+0100},
title = {Fluorescence and Surface-Enhanced Vibrational Spectroscopies of Lawsone and Plumbagin},
type = {Journal Article},
url = {/brokenurl#<Go to ISI>://WOS:000405754400002},
volume = 49,
year = 2016
}