Solvent effect on the visible absorption spectrum of (acetylacetonato)( N,N,N',N' -tetramethylethylene-diamine)copper(II) was applied to estimate D N , the donor numbers of the binary mixtures of dimethyl sulfoxide with a series of other dipolar aprotic solvents. It was found that resulting D N values may be treated as explanatory parameters in the description of the mixed solvent effect on the stability constants of complexes formed by some macrocyclic ligands with univalent cations.
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Rzeszotarska et al. (1994) studied this question.