Collect. Czech. Chem. Commun. 1994, 59, 2201-2208

Donor Numbers for Binary Mixtures of Dimethyl Sulfoxide with Dipolar Aprotic Solvents

Jadwiga Rzeszotarska, Przemyslaw Ranachowski and Marek K. Kalinowski

Department of Chemistry, University of Warsaw, 02-093 Warsaw, Poland


Solvent effect on the visible absorption spectrum of (acetylacetonato)(N,N,N',N'-tetramethylethylene-diamine)copper(II) was applied to estimate DN, the donor numbers of the binary mixtures of dimethyl sulfoxide with a series of other dipolar aprotic solvents. It was found that resulting DN 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.