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

Abstract

The crystal structure of the title compound, (CI 8 HI 2 C1N 4 0 2 ) 2 U, has been determined from three-dimensional X-ray diffraction data. The structure is monoclinic, space group P2,/c, with a = 7.545(1), b = 19.890(1), c = 12.210(1) Α, β = 110.66(1)°, V= 1714.52 A 3 and Ζ = 2. The structure was solved by direct methods and refined by least-squares to a final R = 0.025 (R w = 0.027, R g = 0.036). The uranium atom lies on a crystallographic symmetry center, while the tridentate organic ligand binds equatorially to the uranyl ion, U0 2 + , leading to eight-coordinated uranium in a distorted hexagonal bipyramidal coordination geometry. Selected bond lengths: U-O(uranyl) 1.764(5) Ä, U-O(ligand) 2.364(4) Ä, U-N 2.634(5)-2.702(5) A. 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.Brought to you by |