Ligand-field analysis of the ion VO2+: application of the angular overlap model to the electronic absorption spectrum of bis(acetylacetonato)oxovanadium(IV) in various solvents

Abstract

A ligand-field analysis employing the angular overlap model of the electronic d–d spectrum of [VO(acac)₂](acac = acetylacetonate) is presented. A consistent set of e_λ values has been determined through statistical procedures. First, the constancy of the parameters was assumed when solid [VO(acac)₂] is dissolved in different solvents. Then, the results were compared with those obtained when variability of the parameters with the solvent is allowed. Variations in the electronic spectra are primarily dependent on modifications in the chromophore topology induced by the solvent. Earlier calculations using the point-charge electrostatic model are discussed on the basis of the formal equivalence between the models.