Apparently Anomalous Magnetism in Low Spin Iron(II) Complexes
A systematic investigation of some iron(II) complexes which might be expected to lie near the high spin - low spin crossover, shows that the complexes are actually low spin, and previously reported anomalous magnetic moments are found to arise essentially from paramagnetic impurities. The temperature independent paramagnetism (χ *) expected for iron(II) in the low spin ( 1A 1) state is calculated and the utility of comparison with available results of electronic absorption and Mössbauer Effect spectroscopy measurements discussed. The approximations involved in calculations of χ * are discussed in detail, and the maximum value of χ * that could reasonably be expected is estimated at 3 × 10 -4 c.g.s.e.m.u. This estimate is supported by experimental magnetic susceptibility measurements which may be reasonably explained in terms of a value of χ * less than 3 × 10 -4 c.g.s.e.m.u., together with, in some cases, a contribution from a paramagnetic impurity with normal Curie-Weiss behaviour. Where applicable, the magnitude of the contribution from paramagnetic impurities is estimated. © 1969.
E. Sinn, "Apparently Anomalous Magnetism in Low Spin Iron(II) Complexes," Inorganica Chimica Acta, Elsevier, Jan 1969.
The definitive version is available at https://doi.org/10.1016/S0020-1693(00)92437-X
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© 1969 Elsevier, All rights reserved.