Published Paper Details:

In most cases, complex formation being a complex between metal ions and protons, it is reasonable to expect that there is some correlation between stability constant of complex and acidic dissociation constant of conjugate acid of ligand. Larson1 found linear relationship between corresponding constants for complexes of silver(I) with organic amines. Subsequently similar correlation were found in many complex systems.2-3 The ligand may affect chelating tendency in two possible ways - (i) It may influence the basicity of donor groups by inductive and resonance effect or and (ii) the addition of groups on ligand may be purely statistical (sterical) effects prevent the ligand ions or molecules from acquiring the orientation about central metal ions most favorable for chelation. In certain cases linear correlations was found between Hammett constant (?) for the functional groups of the complexes. May and Jones4 have applied Hammett's equation to complexes of substituted benzoic acids. Irving and Desilva5introduced stability factor "Sf" which is a measure of the stabilization due to ? bonding.