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Potentiometric and UV-Visible Spectrophotometric Studies of the Stability of Thorium(IV) Complexes with (o-Hydroxyphenyl) Mono- and Di-Methylenephosphonic Acids

Abstract : Protometric studies were performed in aqueous solutions at 25 • C and 0.1 mol•dm −3 ionic strength (NaClO 4) to determine the complexing abilities of eight (ohydroxy-phenyl) mono-and di-methylenephosphonic acids (differently substituted by chromophoric or auxochromic groups) towards thorium(IV). The number, the nature of the species present in solution, their overall stability constants over a broad acidity range and their individual electronic spectra, as resolved by computation, have been determined by potentiometry and UV-visible spectrophotometry. The formation of 1:1 species, partially protonated MLH x and totally deprotonated [ML], as well as hydroxo species-mononuclear ML(OH) x and dinuclear M 2 L(OH) x is reported with thorium(IV). The results show that the complexing power, which is not very different in the lanthanide series, is much higher for thorium(IV). The ratio Th 4+ /Eu 3+ reaches eight log 10 units with some of the ligands.
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https://hal.univ-angers.fr/hal-03230395
Contributeur : Mustayeen Khan <>
Soumis le : vendredi 21 mai 2021 - 13:27:15
Dernière modification le : lundi 31 mai 2021 - 11:06:57

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Embarek Bentouhami, Gilles Bouet, Marie-José Schwing, Mustayeen Khan. Potentiometric and UV-Visible Spectrophotometric Studies of the Stability of Thorium(IV) Complexes with (o-Hydroxyphenyl) Mono- and Di-Methylenephosphonic Acids. Journal of Solution Chemistry, Springer Verlag (Germany), 2006, 35, pp.889 - 916. ⟨10.1007/s10953-006-9033-1⟩. ⟨hal-03230395⟩

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