CRYSTAL FIELD ASPECTS OF VIBRATIONAL SPECTRA .1. FIRST-ROW TRANSITION METAL(III)BETA-KETOENOLATES

The M-O stretching frequencies of the acetylacetonates, benzoylacetonates, dibenzoylmethanates, trifluoroacetylacetonates and dipivaloylmethanates of the ions Sc(III), V(III), Cr(III), Mn(III), Fe(III) and Co(III) have been determined and shown to exhibit a correlation with d-orbital population which is consistent with the relative crystal field stabilization energies of the metal(III) ions. Band assignments are discussed and an amendment to previously suggested assignments of the C-O and C-C stretching frequencies of phenyl-substituted β-ketoenolates is proposed. © 1969.