Elsevier, Chemical Physics Letters, 3-4(311), p. 299-305
DOI: 10.1016/s0009-2614(99)00859-3
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Density functional theory within a transition potential approach (DFT-TP) is applied to interpret remarkably strong π-type MLCT (metal-to-ligand charge transfer) satellites in the Ni 2p photoabsorption of planar low-spin NiII complexes, K2Ni(CN)4·H2O and bis(dimethylglyoximato)nickel. The MLCT intensities calculated with DFT-TP are in good agreement with experiment, whereas the HF-STEX (Hartree–Fock-based static exchange approximation) approach underestimates the intensities. The DFT-TP approach gives more reasonable π-back donation due to a better description of the strong covalency hybridization of the ligand π* orbitals with the occupied 3d orbitals. The DFT analysis indicates that we can evaluate π-back donation qualitatively by experimentally examining the MLCT satellites.