Examination of Thermodynamic parameters of Metal-Ligand complexes

Metal complex study is well established area of research work. There are many techniques available for ligand-metal complexation studies viz. spectrophotometry, potentiometry,fluorescence, calorimetry, squre wave polarography and conductometry. To study the formation constant of ligand with metal ions in solution we have selected conductometric method because of its various advantages such as low cost, eco-friendly, less time consuming, proper thermodynamic calculation with different parameters and most important easy to operate, besides these the measurements can be carried out with high precision at very low concentration in diluted solutions. The conductance of an electrolyte solution depends on the number and mobility of the ionic species present in the solution. In view of the fact that ligand form complexes with a variety of cations, and with the assumption that the mobility of the free cations is different from their complexes, conductance measurements of a solution of metal salt in the presence of a ligand provide two valuable information: (i) stability and (ii) transport phenomena of ligand-metal ion complex in the solution.