Chelation of Some Bivalent Metal Ions with Alanine and Phenylalanine

The interaction of D, L, or racemic forms of alanine and phenylalanine with some bipositive metal ions (Cd, Cu, Ni, Pb and Zn) has been studied. The proton dissociation constants of the ligands and stability constants of the complex species formed have been determined. No stereospecific effects have been observed, i.e. no significant differences h ave been found between the stability constants of the corresponding MD or ML, and MD 2, ML 2 or MLD complexes in aqueous solution at 20°C and an ionic strength of 0.37 (NaN03). The MLD complex is considered as being the predominant species in t he system consisting of ·metal ions and a racemic ligand

Beitr�ge zur zytologie und embryologie einiger insektensymbiosen

Diss. München.OPLADEN-RUG0