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The crystal structure of the title compound, (C 18 H 12 ClN 4 O 2 ) 2 U, has been determined from three-dimensional X-ray diffraction data. The structure is monoclinic, space group  P 2 1 / c , with  a  = 7.545(1),  b  = 19.890(1),  c  = 12.210(1) Å,  β  = 110.66(1)°,  V  = 1714.52 Å 3  and  Z  = 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, UO 2  2+ , 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.

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