1 research outputs found
Coordination Modes of Americium in the Am<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub>Â(H<sub>2</sub>O)<sub>6</sub>·4H<sub>2</sub>O Oxalate: Synthesis, Crystal Structure, Spectroscopic Characterizations and Comparison in the M<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub>Â(H<sub>2</sub>O)<sub>6</sub>·<i>n</i>H<sub>2</sub>O (M = Ln, An) Series
Americium oxalate
single crystals, Am<sub>2</sub>Â(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub>Â(H<sub>2</sub>O)<sub>6</sub>·​4H<sub>2</sub>O, were prepared by <i>in situ</i> oxalic acid generation
by slow hydrolysis of the diester. Their structure was determined
by single-crystal X-ray diffraction and was solved by the direct methods
and Fourier difference techniques. The structure (space group <i>P</i>2<sub>1</sub>/<i>c</i>, <i>a</i> =
11.184(4) Å, <i>b</i> = 9.489(4) Å, <i>c</i> = 10.234(4) Å, β = 114.308(8)°, <i>Z</i> = 2) consists of layers formed by six-membered rings of actinide
metals connected through oxalate ions. The americium atoms are nine-coordinated
by six oxygen atoms from three bidentate oxalate ligands and three
water molecules. The distances within the coordination sphere as well
as infrared and Raman spectra of several isostructural lanthanide
(CeÂ(III), PrÂ(III), NdÂ(III), SmÂ(III), GdÂ(III)) and actinide (PuÂ(III),
AmÂ(III)) oxalates were compared to evaluate the similarities and the
differences between the two series