L. Bláha, J. Rohovec, P. Hermann, I. Lukeš:
"Complexes of Aminoalkyl-phosphonic Acids and Phosphonodipeptides with Pt(II) and Pd(II)."
Phosphorus, Sulfur, Silicon, Rel. Elements  109-110, (1996) 213-16

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 studied pH-metrically at 25°C and at ionic strength of 0.1 mol.dm^-3 (KNO₃).  The stability consts. calcd. 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 ³¹P and ¹H NMR titrns.