The electronic spectra and magnetic susceptibilities of the complexes [UCl6]2–, [UCl4Br2]2–, [UBr6]2–, [UCl4(Ph3PO)2], [UCl4(Et3PO)2], and [UBr4(Ph3PO)2] have been measured. Relative values for the nephelauxetic effects, and the ligand fields, of the ligands have been derived. The possibility of spin-pairing in uranium(IV) is discussed and shown to be unlikely.
J. P. Day and L. M. Venanzi, J. Chem. Soc. A, 1966, 197 DOI: 10.1039/J19660000197
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