The absorption spectra of a number of substituted 8-hydroxyquinolines, their anions, their protonated cations, and their complexes with several cations have been measured. The results show that both the substituents and the metal cations interact strongly with the π-system of the ligand and therefore with one another.
L. Morpurgo and R. J. P. Williams, J. Chem. Soc. A, 1966, 73 DOI: 10.1039/J19660000073
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