. Whilst such features in U(III) complexes can be assigned as 5f→6d transitions, 1 they have previously been attributed to formally Laporte forbidden f-f transitions, with the "intensity-stealing" due to significant mixing of U 5f orbitals with both 6d orbitals and ligand orbitals. Magnetism. The effective magnetic moment (µeff) and molar magnetic susceptibility (χMT) of powdered samples of paramagnetic 1-M suspended in eicosane were examined by variable-temperature DC SQUID magnetometry and CASSCF-SO (see below) calculations (selected parameters compiled in Table , see Supporting Information Figures