Convenient syntheses of uranyl(VI) cis-dihalide complexes as anhydrous starting materials

The targeted syntheses of uranyl(VI) complexes UO2X2L (X = Cl, Br) possessing halide ligands exclusively at cis equatorial coordination sites are reported, supported by a neutral tridentate ligand (L), N,N,N′,N′-tetraalkylpyridine-2,6-dicarboxamide (1). A monomeric pentagonal bipyramidal geometry is observed in the solid state for the isostructural chloride (2a) and bromide (3a) derivatives as determined by X-ray crystallography.