Ligands containing elements of Group VIB. Part I. The silver complexes of substituted phenylthioacetic acids

Abstract

The stability constants of the silver complexes of 21 substituted phenylthioacetic acids (HL) of general formula R·C₆H₄·S·CH₂·CO₂H have been measured, using a silver–silver chloride indicator electrode with a mercurous sulphate reference electrode, at 20·0° in a sodium acetate–acetic acid buffer solution (µ= 0·10M). Stability constants for the complex species AgL, AgHL⁺(µ= 0·20M), and AgL₂^– are calculated, and the values related to one another through the Hammett σ-values for the substituents. Chelation is shown to take place when the substituent is o-SCH₃, and polymerization with p-SCH₃.