Formation constants of the chelates of Ni(II) and Tl(I) with glycollic acid and thioglycollic acid have been determined by Irving‐Rossotti technique. The relative stabilities have been interpreted in terms of the possibility of π interaction in the formation of NiS bond.

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. Can. J. Chem. 72, 1107Chem. 72, (1994. The stability constants of binary and ternary complexes [MA], [Ma2], and [MALI (where M = Zn(I1) on Cd(I1); A = glycylglycine, glycyl L-alanine, glycyl L-leucine; L = a-alanine phenylalanine, tyrosine, tryptophan, or L-listidine) in aqueous medium have been determined potentometrically at 25OC and an ionic strength of 0.2 M NaC10, (0.2 rnol dm-3) using a computer system. It is observed that A log K of MAL complexes has low negative or positive values. Probable reasons have been dis- [Traduit par la RCdaction]