Stability of bivalent metal complexes with Schiff's bases derived from salicylaldehyde

Stability constants of iron, nickel, cobalt, zinc, copper and manganese complexes with the Schiff's bases from salicylaldehyde and aniline and its derivatives, have been determined in 50% aqueous dioxan at constant ionic strength (0·1 M NaClO4). The order of stability constants found is: Mn < Cd < Co < Zn < Ni < Cu < Fe Values of δH and Er (MnZn) have been calculated. The ligands appear bidentate in these complexes.