Dependence on ionic strength of stability constants, protonation and complexation of 2,X-dihydroxybenzoic acids(X=4, 5 or 6) with aluminium(III)
Date
2006
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Walter de Gruyter
Abstract
The complexation of aluminium(III) with 2,X(X = 4, 5, 6)-dihydrobenzoic acids (DHBA) has been investigated potentiometrically. The temperature was kept constant at 25 degrees C and the ionic strengths were kept (0.1, 0.3, 0.5, 0.7 and 0.9) mol/l in sodium chloride media. It was shown that aluminium(III) form a mononuclear Al(HL)(+) type 1:1 complex with 2,X(-DHBA), where L3- represents the fully dissociated 2,X(X = 4, 5, 6) anion at pH = 4 - 5. The stochiometries of the complexes were determined by continuous varitions method. The protonation constants of 2,X(-DHBA) (using the potentiometric technique) and the stability constant of the complex were determined at different ionic strengths. The dependence of ionic strength on the protonation and stability constants was evaluated using a simple Debye - Huckel type equation.
Description
Keywords
Chemistry, Stability constant, Potentiometry, Debye - Huckel equations, Aluminium(III), 2,6-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, Dioxovanadium(V), Amino-acids, Weak complexes, Glycine complexes, Different temperatures, Dissociation-constants, Hydroxyaromatic ligands, Thermodynamic parameters, Aqueous-solution, Al(III)
Citation
Türkel, N. ve Tabak, E. (2006). ''Dependence on ionic strength of stability constants, protonation and complexation of 2,X-dihydroxybenzoic acids(X=4, 5 or 6) with aluminium(III)''. Main Group Metal Chemistry, 29(4), 175-188.