%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 }