

A detailed analysis of Zeeman splittings of highly resolved spinforbidden transitions in [Cr(bpy)_{3}](PF_{6})_{3}Â is presented. Assignments of vibronic bands are made based on lowtemperature absorption, emission, and infrared spectra. The pattern of doublet states, obtained for H = 0 and H = 5 T, is consistent with angular overlap model (AOM) calculations, which allow one to consider Ïƒ and Ï€interactions between the metald and relevant ligand orbitals and the particular angular geometry of the chromophore simultaneously. The observed level splittings are found to result from the combined effect of trigonal distortion and contributions of the symmetry adapted d_{Ï€}orbitals involved due to coupling with corresponding counterparts from the bidentate ligand (phase coupling). The larger splitting of the lowest excited stateÂ ^{2}E_{g}(O_{h}) in the analogous ClO_{4}^{}Â salt is due to the more distorted geometry of the [CrN_{6}] moiety. Related properties of the bipyridine ligand, which turn out to show donor behavior in the present compounds, and the acetylacetonate ligand are discussed, and AOM parameters for the metalâˆ’ligand Ï€interaction are correlated with results of MO calculations. 