Structure and properties of 2,2-dihydroxymalonates of trivalent Y, lanthanides, Pu and Am

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 Y 3+ and Ln 3+ 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 1.0…