mu-eta(2):eta(2)-Peroxido-bis[nitratodioxidobis(pyrrolidin-2-one)uranium (VI)]

作者：Takao Koichiro; Ikeda Yasuhisa^*

来源：Acta Crystallographica Section E-Structure Reports Online, 2010, 66: M539-U661.

DOI：10.1107/S1600536810013449

In the crystal structure of the title compound, [U-2(NO3)(2)O-4(O-2)(C4H7NO)(4)], two UO22+ ions are connected by a mu-eta(2):eta(2)-O-2 unit. The O-2 unit shows 'side-on' coordination to both U atoms. An inversion center is located at the midpoint of the O-O bond in the O-2 unit, affording a centrosymmetrically expanded dimeric structure. The U-O(axial) bond lengths are 1.777 (4) angstrom and 1.784 (4) angstrom, indicating that the oxidation state of U is exclusively 6+, i.e., UO22+. Furthermore, the O-O distance is 1.492 (8) angstrom, which is typical of peroxide, O-2(2-). The U atom is eight-coordinated in a hexagonal-bipyramidal geometry. The coordinating atoms of the nitrate and pyrrolidine-2-one ligands and the mu-eta(2):eta(2)-O-2(2-) unit are located in the equatorial plane and form an irregular hexagon. An intermolecular hydrogen bond is found between N-H of the pyrrolidine-2-one ligand and the coordinating O of the same ligand in a neighboring complex. A second intermolecular hydrogen bond is found between the N-H of the other pyrrolidine-2-one ligand and one of the uranyl oxido atoms.

• 出版日期2010-5