The complex formation equilibria of 5-sulphosalicylic acid with lanthanide(III) and thorium(IV) ions have been studied by means of potentiometric [H+] measurements in aqueous solution at 20 °C in a 1M (Na,H)ClO4 medium. The analysis of the potentiometric data referring to pH ranges where the hydrolytic reactions of metal ions are negligible indicates the formation of chelate complexes of the type LnL and LnL23- for the rare earth ions and ThL+ for the thorium ion. The ligand behaves as chelating agent through both the deprotonated carboxylate and phenolate groups. The stability constants of the complexes are reported and discussed.
Reactions of 5-Sulphosalicylic acid with lanthanides(III) and thorium(IV) in aqueous solution.
DI BERNARDO, PLINIO;
1972
Abstract
The complex formation equilibria of 5-sulphosalicylic acid with lanthanide(III) and thorium(IV) ions have been studied by means of potentiometric [H+] measurements in aqueous solution at 20 °C in a 1M (Na,H)ClO4 medium. The analysis of the potentiometric data referring to pH ranges where the hydrolytic reactions of metal ions are negligible indicates the formation of chelate complexes of the type LnL and LnL23- for the rare earth ions and ThL+ for the thorium ion. The ligand behaves as chelating agent through both the deprotonated carboxylate and phenolate groups. The stability constants of the complexes are reported and discussed.File in questo prodotto:
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