EFFECTS OF AXIAL LIGATION ON LIGAND FIELD SPECTRA OF COPPER(2) BETA-DIKETONATES

The effects of single and double addition of pyridine upon the ligand field spectrum of bis(hexafluoroacetylacetonato)copper-(II) have been investigated in an attempt to apply group theoretical and qualitative crystal field predictions to the assignment of the d-d bands. Four-band Gaussian analyses are presented, the features of which are consistent with these predictions. An analogous treatment is found possible for the parent acetylacetonate of copper and its monopyridine adduct. The bis(hexafluoroacetylacetonato)copper(II)-water system has also been studied. It is postulated that both a mono- and a bisaquo adduct exist in addition to the anhydrous chelate. © 1968, American Chemical Society. All rights reserved.