Publication: Potentiometric and spectroscopic studies on yttrium(III) complexes of dihydroxybenzoic acids
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Aydın, Rahmiye
Özer, Ulviye
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Pharmaceutical Soc Japan
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Abstract
The equilibrium reactions of yttrium(III) ion with dihydroxybenzoic acids (2,3-dihydroxybenzoic acid (2,3-DHBA) and 3,4-dihydroxybenzoic acid (3,4-DHBA)) (H3L) were investigated in aqueous solution by means of potentiometric and spectroscopic methods, in 0.1 mol.l(-1) ionic strength medium at 25degreesC. The stability constants are reported for YL, YL(HL)(2-) and YL23--type mononuclear complexes. 2,3-DHBA can bind Y(III) ion strongly and the salicylate mode is effective over the acidic pH range. But in higher pH range, 2,3-DHBA and 3,4-DHBA act more efficiently through catecholate groups. The complexes of 2,3-DHBA are more stable than the complexes of 3,4-DHBA.
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Keywords
Pharmacology and pharmacy, Chemistry, Stability constant, Yttrium(III) ion, Dihydroxybenzoic acid, Potentiometric method, Spectroscopic method, Salicylic-acid, Hydroxyaromatic ligands, Catechol derivatives, Aqueous-solution, Scandium(III), Stabilities, Ion, Equilibria, Hydrolysis, Iron(III)
Citation
Aydın, R. ve Özer U. (2004). “Potentiometric and spectroscopic studies on yttrium(III) complexes of dihydroxybenzoic acids”. Chemical and Pharmaceutical Bulletin, 52(1), 33-37.