Abstract
The nature of mixed ligand complexes of thiocyanate (SCN), thioacetamide (TAA) and nicotinamide (nico) with Cd(II) was studied polarographically in aqueous medium at 25 ± 0.5 °C. The mixed complexes [Cd(SCN)(TAA)] + (2.05), [Cd(SCN)(TAA) 2] + (1.17), [Cd(SCN) 2(TAA)] (2.15), [Cd(TAA) 2(nico)] ++ (1.61), [Cd(TAA)(nico) 2] ++ (1.36) and [Cd(TAA) 2(nico)] ++ (1.68) were detected (the values in parentheses are log stability constants). The positive values of mixing constant and stabilization constant reveal that the mixed complexes [Cd(SCN)(TAA)] + and [Cd(TAA)(nico)] ++ are more stable than their parent binary complexes. The observed enhancements of the complexation constants of the mixed complex species were attributed to the possibilities of some weak bonding between the unlike bound ligands, simultaneous π-bonding between Cd(II) and both the ligands and cooperative effects of electrostatic forces between the ligands.
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