The structure of α-dioximes and their coordination modes in uranyl complexes

Structure of five uranyl complexes containing α-dioximes along with water and neutral ligand molecules was studied by the method of X-ray diffraction analysis. It was ascertained that in all the compounds studied coordination number of uranyl in the equatorial plane equals 6, while the angle between U-O and U-N bonds formed during coordination of oxime by uranyl group has a minimal value compared with the rest valency angles in the equatorial plane of the complexes. Hence, formation of a three-member metal cycle due to O and N oxime atoms coordination by uranyl results in the maximum practicable coordination number 6