The effect of a donor methyl groups in the structure of 6,6′-bis(di(3,5-R-phenylphosphinoyl)-2,2′-bipyridyl R = H or Me on the stability constants of lanthanum complexes was studied. Regardless of the presence of a donor substituent in phosphine oxide moiety, the stoichiometry of the complex with lanthanum was 1:1 metal to ligand. The values of the stability constant of the complexes were obtained. The insertion of methyl groups lead to increase in stability of the corresponding complexes with lanthanum which correlates well with enhance in extraction ability of the corresponding compounds towards europium.
The influence of the structure of phosphonic acid esters on the stability of their terbium complexes was studied. It was shown that one complex particle was formed irrespective the nature of the side ester chain, and the metal-ligand stoichiometry of the complex was 1:1. The stability constants of the terbium complexes were determined. An increase in the size of the bulky substituent leads to an increase in the stability of the complexes.
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