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Although the first organoactinide chloride Cp 3 UCl (Cp=η 5 -C 5 H 5 ) was synthesized more than 50 years ago, binuclear uranium halides remain very rare in organoactinide chemistry. Herein, a series of binuclear trivalent and tetravalent uranium halides and cyanides with cyclooctatetraene ligands, (COT) 2 U 2 X  n   (COT=η 8 -C 8 H 8 ; X=F, Cl, CN;  n =2, 4), have been systematically studied using scalar-relativistic density functional theory (DFT). The structures with bridging halide or cyanide ligands were predicted to be the most stable complexes of (COT) 2 U 2 X  n  , and all the complexes show weak antiferromagnetic interactions between the uranium centers. However, for each species, there is no significant uranium-uranium bonding interaction. The bonding between the metal and the ligands shows some degree of covalent character, especially between the metal and terminal halide or cyanide ligands. The U-5f and 6d orbitals are predominantly involved in the metal-ligand bonding. All the (COT) 2 U 2 X  n   species were predicted to be more stable compared to the mononuclear half-sandwich complexes at room temperature in the gas phase such that (COT) 2 U 2 X 4  might be accessible through the known (COT) 2 U complex. The tetravalent derivatives (COT) 2 U 2 X 4  are more energetically favorable than the trivalent (COT) 2 U 2 X 2  analogs, which may be attributed to the greater number of strong metal-ligand bonds in the former complexes.

Binuclear trivalent and tetravalent uranium halides and cyanides supported by cyclooctatetraene ligands