2016 |
Aliaga, A E; Leyton, P; Clavijo, E; Campos-Vallette, M Fluorescence and Surface-Enhanced Vibrational Spectroscopies of Lawsone and Plumbagin Artículo de revista Spectroscopy Letters, 49 (5), pp. 326-335, 2016, ISSN: 0038-7010. Resumen | Enlaces | BibTeX | Etiquetas: behavior, calculations, enhanced fluorescence, infrared-absorption, lawsone, nanoparticles, plumbagin, quinones raman raman-scattering, reduction, scattering, selection, sers, silver spectrum, surface theoretical @article{RN318, title = {Fluorescence and Surface-Enhanced Vibrational Spectroscopies of Lawsone and Plumbagin}, author = { A.E. Aliaga and P. Leyton and E. Clavijo and M. Campos-Vallette}, url = {/brokenurl#<Go to ISI>://WOS:000405754400002}, doi = {10.1080/00387010.2016.1146772}, issn = {0038-7010}, year = {2016}, date = {2016-01-01}, journal = {Spectroscopy Letters}, volume = {49}, number = {5}, pages = {326-335}, 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.}, keywords = {behavior, calculations, enhanced fluorescence, infrared-absorption, lawsone, nanoparticles, plumbagin, quinones raman raman-scattering, reduction, scattering, selection, sers, silver spectrum, surface theoretical}, pubstate = {published}, tppubtype = {article} } 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. |
2016 |
Fluorescence and Surface-Enhanced Vibrational Spectroscopies of Lawsone and Plumbagin Artículo de revista Spectroscopy Letters, 49 (5), pp. 326-335, 2016, ISSN: 0038-7010. |