Figure 8: Kohn–Sham molecular orbital representations of the principal Th–P interactions of 5.
From: Thorium–phosphorus triamidoamine complexes containing Th–P single- and multiple-bond interactions

HOMO−1 (a, −4.447 eV) and HOMO (b, −3.777 eV) represent the two principal thorium–phosphorus covalent σ-bonding and dative π-symmetry interactions in 5.