| Full text | |
| Author(s): |
Barboza, Cristina Aparecida
;
Germino, Jose Carlos
;
Alves Duarte, Luis Gustavo Teixeira
;
Quites, Fernando Junior
;
Muniz Vazquez, Pedro Antonio
;
Zambon Atvars, Teresa Dib
Total Authors: 6
|
| Document type: | Journal article |
| Source: | Journal of Luminescence; v. 184, p. 268-272, APR 2017. |
| Web of Science Citations: | 1 |
| Abstract | |
Due to the occurrence of excited intramolecular proton transfer (ESIPT) in salicylidenes, in this article the photoacidity of the N-salicylidene-5-chloroaminopyridine (sal-5-Cl-py) was evaluated by electronic absorption and fluorescence spectroscopy. The results strongly suggest that sal-5-Cl-py in aqueous solution behaves as,a superacid, Delta pK(a),7=8.83, due to a large change of the dipole moment under electronic excitation between protonated and deprotonated species. Theoretical calculations under the density functional theory -DFT framework showed that as result of the ESIPT the electron density migrates from the phenol to the chloroaminepyridine ring. Such a charge migration is the driving force for the proton transfer reaction. (C) 2016 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 13/16245-2 - Photophysical properties of thin films of conjugated polymers |
| Grantee: | Teresa Dib Zambon Atvars |
| Support Opportunities: | Regular Research Grants |