Potentiometric study of reactions of rare-earth elements with 3-allylpentanedione in a water-dioxane medium |
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| Authors: | N V Pashchevskaya S N Bolotin M E Sokolov A A Sklyar V T Panyushkin |
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| Institution: | (1) Kuban State University, ul Stavropol’skaya 149, Krasnodar, 350040, Russia |
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| Abstract: | Reactions of the ions of La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Yb, and Lu with 3-allylpentanedione (HL) in a water-dioxane (50 vol%) medium were studied by pH-metric titration. Stability constants of LnL2+ and LnL 2 + complexes and pH range where these compounds are mainly formed were determined. The dependence of the stability constants on the atomic number of an element has a characteristic break on the gadolinium ion and shows that the stability of the complexes increases as the size of Ln3+ ions decreases. |
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