Bonding and Energy Parameters for Some Praseodymium(III) Mixed Ligand Complexes

Abstract

The electronic spectra of the mixed ligand complexes of praseodymium(III) with vanillinmonoxime, benzoin-α-oxime as the primary ligand and diacetylmonoxime, N-phenylanthranillic acid, 8-hydroxy-quinoline, bipyridyl, N-phenylthiourea and thiourea as the secondary ligands have been studied. The values of interelectronic repulsion parameters i.e., Slater-Condon (F_K), Racah (E^K) and spin-orbit interaction referred as Lande parameter (ζ_4f) and intensity parameters have been calculated from their electronic spectral data. Using F₂ values the nephelauxetic ratio (β), bonding parameter (b^1/2), Sinha’s parameter (δ %) and covalency angular overlap parameter (η) have been calculated which give useful information regarding bonding in these complexes. The effect of screening terms is also calculated.