Studies on Stability Constants of Salicylates Derivatives (Part-I)

The Job s method of continuous variation was used to study the chelating behavior of salicylic acid with different transition metals. In this regard spectrophotometric measurements for 2- hydro-oxybenzoic acid and 2-hydroxy 4-arnino benzoic acid with m and lIB metals were made. The stability constants of the system, in which 1: 1,2: 1 (L:M) complexes formed at different pH values were calculated. The measurements also reflect the effects of concerned metals and ligands used for chelation. Between two ligands, 2-hydroxy benzoic acid and 2-hydroxy 4-arnino benzoic acid, the later found to form stable complexes than the former.