Publication at Faculty of Science |
1996
Abstract
Complexing properties of aminomethylenephosphonic acid and dipeptides glycyl-aminomethylenephosphonic acid and both diastereoisomers of (S)-methionyl-1-aminoethylphosphonic acid with Pt(II) and Pd(II) were investigated pH-metrically at 25 degrees C and at ionic strength of 0.1 mol dm(-3) (KNO3). The stability constants calculated indicate formation of the complexes with a metal : ligand molar ratio of 1 : 1 and 1 : 2.
The differences found for diastereoisomers are much higher than for systems with common dipeptides. Distribution of all species found by potentiometry were confirmed by P-31 and H-1 NMR titrations.