O. Popovych, L. Rogers
1960
Citations
0
Influential Citations
18
Citations
Journal
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Abstract
Abstract Fluorescence spectra, intensities and efficiencies of zinc chelates of 8-quinolinol (oxine), oxine-5-sulfonic acid, 2-methyl-oxine and 5:7-dichloro-oxine were obtained as a function of solvent and substitution. Shifts in fluorescence maxima did not always parallel corresponding solvent shifts for absorption maxima. The fluorescence spectra of chelates of gallium, indium, zinc, magnesium and cadmium with 2-methyl-oxine were also measured and compared. All except zinc experienced blue shifts in the fluorescence bands, which were interpreted as arising from steric inhibition of resonance by the 2-substituent. Fluorescence efficiency was found to be a sensitive function of solvent, being highest in inert solvents. Substitution of the sulfonic-acid group on the ligand gave an unexpected rise in the fluorescence efficiency of the chelates, especially in dimethylformamide. Fluorescence efficiency was found not to be adversely affected by steric hindrance. Analytical implications of the results are discussed.