Complexation Studies of Copper (II) with Some S-phenyl mercaptoacetic Acids

Abstract

The proton-ligand stability constants of s-phenylmercaptoacetic
acid,ortho-fluoro-s-phenylmercaptoacetic acid and  ortho-methoxy-s-
phenylmercaptoacetic acid and stepwise formation constants of
copper(II) with these ligands have been determined in 50% (v/v)
dioxane-water medium using Calvin-Bjerrum pH titration technique
as modified by Irving and Rossotti. The stability constants of the
complexes follow the order ; parent acid > —OCH3 > —F. The
variations in the magnitude of the stability constants are accounted
by considering the participation of sulphur also in coordination.