The Configuration of Organic Coördination Compounds of Nickel, with Especial Reference to Bis-formylcamphor-ethylenediamine-nickel

The Sterochemistry of Square Complexes.

“…From the regularities noted earlier (109) this band is to be associated with covalently bound nickel. French, Magee, and Sheffield (52) have recently reported that ethylenediamine-formylcamphor nickel when dissolved in methyl alcohol is paramagnetic with a moment of 1.9 Bohr magnetons, an observation which must mean that there is an equilibrium between nickel in the two different magnetic conditions.17 An added complication arises from the fact that some of the nickel may become octahedrally coordinated, in which case it would be magnetically indistinguishable from ionically bound nickel. Although it is unlikely that nickel becomes octahedrally coordinated by the attachment of two ethyl alcohol molecules, it has yet to be shown that the optical effects under discussion are due to tetrahedrally coordinated nickel.…”