Abstract
EPR spectra of Fe3+ in Al(acac)3 and Ga(acac)3 single crystals were measured in the temperature range between 20 K and room temperature. In the Al compound one center was found above 140 K and three below this temperature due to a phase transition. In Ga(acac)3 two centers with similar zero-field splitting parameters and orientations of their principal axes were observed in agreement with results for Cr3+. In all cases unusually large fourth-order zero-field splitting parameters for low symmetries were required for fitting and simulation of the angular dependences of the spectra. The results for the two compounds differed significantly. The orientations of the principal axes deviate considerably from those calculated from the crystal structure data by application of the superposition model. Thus like in the cases of Cr3+ in the same compounds and on Mn2+ in Zn(acac)2·H2O this model is not applicable, most likely due to delocalization of the conjugated π-electron systems of the ligands.
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Hansen, S., Lehmann, G. EPR of Fe3+ in acetylacetonates. Appl Magn Reson 1, 47–53 (1990). https://doi.org/10.1007/BF03166008
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DOI: https://doi.org/10.1007/BF03166008