Structure and properties of 2,2-dihydroxymalonates of trivalent Y, lanthanides, Pu and Am |
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Authors: | A. V. Gogolev M. S. Grigoriev N. A. Budantseva A. M. Fedosseev |
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Affiliation: | 19572. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119071, Russia
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Abstract: | The M-O bond lengths in the lanthanide series show a well-known behaviour due to lanthanide contraction, including so-called “gadolinium break”. All three bond lengths show a good linear correlation with Shannon ionic radii for Y3+ and Ln3+ ions with coordination number 9. Nevertheless, the slopes of these dependences are different (0.957(16) for OH-groups, 0.85(2) for carboxylate groups and 1.080(17) for water molecules) and differ from unity due to a layer nature of the structures. The ionic radii for Pu3+ and Am3+ with coordination number 9 are absent in the Shannon system of ionic radii. From our data, we can propose the values 1.172 and 1.156 Å for Pu3+, and Am3+, respectively. In all crystals the structure is stabilized through extensive hydrogen bonding involving carboxylic and hydroxyl groups and water molecules. |
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