Abstract
The anisotropic EPR spectrum of C 10H 8FeC 5 undergoes Jahn-Teller effect induced transition to the isotropic spectrum at 123 K in the solid phase. Iron atom tunnelling between the naphthalene benzene nuclei may serve as a model of motion averaging g-factor anisotropy. The model is confirmed by studies of the α-MeC 10H 7FeC 5H 5 and β-FC 10H 7FeC 5H 5 EPR spectra. The latter two compounds show splitting of the g | signals into two components corresponding to dissimilar isomers at temperatures above 77 K. The isomers differ in the mode of iron bonding with the substituted and unsubstituted naphthalene nuclei.
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