Abstract
It was seen in the preceding chapter that the differing electronic configurations of iron(II) and iron(III) in high-spin complexes caused substantial and characteristic differences in the chemical isomer shift, quadrupole splitting, and magnetic field parameters of their Mössbauer spectra. The corresponding strong-ligand-field or low-spin complexes have \( {}^1{A_1}_g{\rm{ and }}{}^2{T_2}_g \) configurations under octahedral symmetry. The low-spin iron(II) \( {}^1{A_1}_g{\rm{ (}}{t_2}{_g^6}{\rm{)}} \) configuration has no unpaired electrons and is diamagnetic, whereas low-spin iron(III) \( {}^2{T_2}_g\;({t_2}{_g^5}) \) embodies an ‘electron hole’ in the \( {t_2}_g \) manifold and is paramagnetic, although magnetic ordering is sometimes observed at very low temperatures.
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© 1971 T. C. Gibb and N. N. Greenwood
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Greenwood, N.N., Gibb, T.C. (1971). Low-spin Iron(II) and Iron(III) Complexes. In: Mössbauer Spectroscopy. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5697-1_7
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DOI: https://doi.org/10.1007/978-94-009-5697-1_7
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