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The interaction of dimethyltin(IV), diethyltin(IV) and trimethyltin(IV) with some selected peptides was investigated at 25°C and ionic strength 0.1 Μ NaN0 3 by a Potentiometrie technique. The peptides are bound to dialkyltin(IV) by carboxylate, deionized amide and amino groups. However, peptides are bound to trimethyltin(IV) by the amino group. The effect of the pKa values of the peptides on the stability constants of their complexes were elucidated. The concentration distribution of the complexes in solution was evaluated.doi:10.1515/mgmc.1918.104.22.168 fatcat:6sshxnfbnbgt3oazyo3viilfm4