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Molecular orbital theory has been used to describe the electronic structure of ferrocene and related compounds. It is shown that, provided the valence‐state promotion energies are considered, the thermochemistry and magnetic properties may be understood.

The electronic transitions observed in complexes of the transition‐metal ions are interpreted in terms of a slightly modified crystal‐field theory. Parameters of chemical interest are derived.

The spectrum of the hydrated manganous ion is interpreted in detail and the factors influencing the widths of the bands are deduced. The band widths in other transition‐metal spectra are shown to be explicable in the same way.