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Crystal structure and spectra of bis[p-chloro-benzoyl-di-(2-pyridyl)ketonohydrazono]uranyl

Published/Copyright: August 25, 2010
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Abstract

The crystal structure of the title compound, (C18H12ClN4O2)2U, has been determined from three-dimensional X-ray diffraction data. The structure is monoclinic, space group P21/c, with a = 7.545(1), b = 19.890(1), c = 12.210(1) Å, β = 110.66(1)°, V = 1714.52 Å3 and Z = 2. The structure was solved by direct methods and refined by least-squares to a final R = 0.025 (Rw = 0.027, Rg = 0.036). The uranium atom lies on a crystallographic symmetry center, while the tridentate organic ligand binds equatorially to the uranyl ion, UO22+, leading to eight-coordinated uranium in a distorted hexagonal bipyramidal coordination geometry. Selected bond lengths: U – O(uranyl) 1.764(5) Å, U – O(ligand) 2.364(4) Å, U – N 2.634(5) – 2.702(5) Å. The crystal cohesion is due to normal van der Waals forces. The IR and UV spectra are in accordance with the established geometrical features of the structure.

Published Online: 2010-08-25
Published in Print: 1992

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