ESR of Copper(II) Complexes in Magnetically Non-dilute Crystals. II. Polycrystals of Various Bis(amino acidato) copper(II) Complexes

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Abstract
The molecular g values of several bis(amino acidato) copper(II) complexes in crystals, whose crystal structures with two molecules per unit cell are known, have been estimated from the crystal g values by considering the effect of the spin-exchange interaction between the dissimilar copper(II) ions. All the crystal g values have been determined here from the powder K-band ESR spectra. Many other complexes with unknown crystal structures have also been dealt with in a similar way. The results have indicated that most of the complexes probably have a tetragonal or nearly tetragonal copper (II) ion environment in crystals, and a tendency for the estimated g⁄⁄ value to decrease with an increase in the energy of the visible absorption peak in crystals have been noted. A discussion about the correlation between an axial molecular g tensor and the two copper-ligand bond lengths of Cu–O and Cu–N has been given.

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