The technique of far infrared magnetic resonance is used to investigate the zero-field splittings of the spin quintet associated with the lowest orbital state of high-spin ferrous iron. Two examples are discussed in detail: the ’’axial’’ compound, ferrous fluosilicate, and the ’’rhombic’’ compound, tetrakis thiophenolate Fe(II). The data are analyzed within the context of the spin Hamiltonian, and values of D and E are directly obtained from the spectra using a closed form solution of the eigenvalue problem. The application of this technique to the high-spin ferrous forms of biomolecules such as the heme and iron-sulfur proteins is also discussed.
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Champion et al. (1977) studied this question.
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