Photometric Studies of Sm (III) and Er (III) Complexes with Tridented Ligand Having Nitrogen and Oxygen as Donor Atom

Potentiometric titration is a technique to determine the concentration of ions by the measurement of EMF. The electrode reaction Mn+ → M. As the concentration of Mn+ changes, the EMF of the cell also changes correspondingly. To determination of stability of co-ordination compounds we consider also thermodynamic stability and kinetic stability. Thermodynamic stability depends upon bond energy, Entropy, Gibbs energy etc. As more as heat release during formation of bond compounds will be more thermodynamically stable and as well as entropy increase during the reaction product will be stable. Kineticaly co-ordination compounas are two types inert (stable) and Labile (unstable). Many physical and chemical factors influence the formation of co-ordination compounas. The stability of co-ordination compounas mainly depends upon the nature of metal ions and of the ligands.