A Fluorescent Chemosensor for Detection pH and Cu2+ Ion Base on 7-((2-Aminoethyl)amino)-5-Bromo-6-Hydroxy-1-Methylquinolin-1-ium-3-Sulfonate: Experimental and DFT Calculation.
J Fluoresc
; 2023 Nov 08.
Article
en En
| MEDLINE
| ID: mdl-37938477
ABSTRACT
A quinoline derivative 7-((2-aminoethyl)amino)-5-bromo-6-hydroxy-1-methylquinolin-1-ium-3-sulfonate (QEt) containing quinoline ring, -[Formula see text] sulfonate, -OH phenol, and amine groups was synthesized and studied luminescence properties. The aqueous solutions QEt 10µM change luminescence color from green (λem = 490 nm) to yellow (λem = 563 nm) as increasing pH and the intensity at a peak of 563 nm is linearly proportional with pH value in the range of pH = 3,0-4,0. The QEt solution can be used as a chemosensor for Cu2+ with an LOD value at 0.66 [Formula see text]. Along with the experiment, the structure, absorption and emission spectra of QEt have been investigated by TD-DFT calculation. The result shows that the absorption band centered at 420 nm is due to the electron transition from HOMO to LUMO (π â π*). The results also help to assign emission band centered at 490 nm is due to the S1 â S0 transition (LUMO â HOMO singlet transition), at 563 nm is due to the T1 â S0 transition (LUMO â HOMO triplet transition). The dependence of the relative intensity of each emission peak on pH, which is experimentally recorded, is explained based on the results of theoretical TD-DFT calculation.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
J Fluoresc
Asunto de la revista:
BIOFISICA
Año:
2023
Tipo del documento:
Article
País de afiliación:
Vietnam