Comparative solution equilibrium studies of anticancer gallium(III) complexes of 8-hydroxyquinoline and hydroxy(thio)pyrone ligands.
Éva A Enyedy, Orsolya Dömötör, Erika Varga, Tamás Kiss, Robert Trondl, Christian G Hartinger, Bernhard K Keppler
Index: J. Inorg. Biochem. 117 , 189-97, (2012)
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Abstract
The stoichiometry and stability constants of the Ga(III) complexes of 8-hydroxyquinoline (HQ), 8-hydroxyquinoline-5-sulfonate (HQS), maltol, thiomaltol, allomaltol and thioallomaltol were determined by means of pH-potentiometry, UV-vis spectrophotometry, spectrofluorometry and (1)H NMR spectroscopy in aqueous solution. Spectrofluorometry was used to determine the stability constants of the Ga(III)-HQ species in water. Formation of [GaL](2+), [GaL(2)](+) and [GaL(3)] complexes was found and the Ga(III) binding ability of the ligands followed the order: thioallomaltol
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