Abstract
Protometric studies were performed in aqueous solutions at 25^C and 0.1 ,mol.dm−3 ionic strength (NaClO4) to determine the complexing abilities of eight (o-hydroxy-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 MLHx and totally deprotonated [ML], as well as hydroxo species -- mononuclear ML(OH)x and dinuclear M2L(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 Th4+/Eu3+ reaches eight log10 units with some of the ligands.
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Bentouhami, E., Bouet, G.M., Schwing, MJ. et al. Potentiometric and UV-Visible Spectrophotometric Studies of the Stability of Thorium(IV) Complexes with (o-Hydroxyphenyl) Mono- and Di-Methylenephosphonic Acids. J Solution Chem 35, 889–916 (2006). https://doi.org/10.1007/s10953-006-9033-1
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DOI: https://doi.org/10.1007/s10953-006-9033-1