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Complex Formation of Selected Trivalent Metal Ions with (4R)-Thiazolidine-4-carboxylic Acid and Some of its Derivatives

P. Butvin, J. Světlík, and D. Taligová

Department of Pharmaceutical Analysis and Nuclear Pharmacy, Faculty of Pharmacy, Comenius University, SK-832 32 Bratislava

 

Abstract: The complex formation of Al(III), Ga(III), In(III), Fe(III), La(III), and Ce(III) with (4R)-thiazolidine-4-carboxylic acid (TCA) and some of its 2-alkyl/aryl-substituted derivatives in aqueous solutions at ionic strength I = 0.1 mol dm-3 (NaCl) and temperature θ = 25°C was studied using the potentiometric titration method. The satisfying results were attained only for Al(III), Ga(III), and In(III) in reaction with TCA and its 2-alkyl-substituted derivatives. Other M(III) tested did not allow to evaluate their complex stability constants because of the precipitate creation or poor interaction. Further it was found that 2-aryl- or 2,2-dimethyl-substituted TCA derivatives are rapidly changed in aqueous solutions resulting in impossibility to determine their correct dissociation constants and hence to quantify the complex formation constants.

Full paper in Portable Document Format: 524a205.pdf

 

Chemical Papers 52 (4) 205–210 (1998)

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