A study of coordination compounds of nickel with some diamines.
The coordination compounds of many transition metals can exist in two form with differing magnetic moments. As the paramagnetic susceptibility arises largely from the unpaired electrons present in the molecule, this means that the two classes of compound for any metal must have differing numbers of unpaired electrons. The first satisfactory explanation of the differing magnetic moments was given by Pauling who suggested that there were two fundamentally different types of coordination compound.
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