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U(IV)/Ln(III) unexpected mixed site in polymetallic oxalato complexes. Part I. Substitution of Ln(III) for U(IV) from the new oxalate (NH4)2U2(C2O4)5·0.7H2O

✍ Scribed by Benedicte Chapelet-Arab; Guy Nowogrocki; Francis Abraham; Stephane Grandjean

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 443 KB
Volume: 178
Category: Article
ISSN: 0022-4596
DOI: 10.1016/j.jssc.2005.06.031

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✦ Synopsis

A new ammonium uranium (IV) oxalate (NH 4 ) 2 U 2 (C 2 O 4 ) 5 Á 0.7H 2 O (1) and three mixed uranium (IV)-lanthanide (III) oxalates, 4) and Na 3 UCe (C 2 O 4 ) 5 Á 10.4H 2 O (5), have been prepared. The crystal structures of compounds 1, 4 and 5 have been determined by singlecrystal X-ray diffraction. The crystal structures were solved by the direct methods and Fourier difference techniques, and refined by a least square method on the basis of F 2 for all unique reflections.

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Single crystals of a new sodium ytterbium oxalate Na[Yb(C 2 O 4 ) 2 (H 2 O)] Á 3H 2 O (1) and six mixed lanthanide (III)-uranium (IV) oxalates (NH 4 6) and Ln ¼ Tb, x ¼ 0:52 (7) have been grown using slow diffusion through silica gels. The crystal structures of all the compounds have been determined