INDO SCF calculations on the complexes of (C8H8)Ln(2,4-C7H11) (THF) (Ln = Nd, Sm, Er) indicate that although the f-electrons are essentially Localized on the metal, 5d orbitals,of the metal interact significantly with the ligand orbitals which plays a major role in the bonding. Furthermore, we have discussed the molecular geometries.