pH Metric Study of Schiff Base Metal Complexes of Nd(III)in Mixed Solvent Media
Keywords:
Stability constant, transition metal ion, Schiff bases, pH metric titration, thermodynamic parameterAbstract
Series of seven Schiff bases 4-hydroxy-3-(1-((5-substitutedphenyl)-1,3,4-thiadiazol-2-yl)imino)ethyl)-2H-chromen-2-one were synthesized by reported method. The proton-ligand and metal-ligand stability constants of these novel Schiff bases with lanthanide metal ion Nd (III) ions using a pH metric titration technique in 80% (v/v) ethanol-water mixture at three different temperatures 298K, 308Kand318K at an ionic strength of 0.1M NaClO4 were determined. The Calvin-Bjerrum method as modified by Irving-Rossotti has been employed to determine metal-ligand stability constant logK values. The thermodynamic parameters such as, Gibb’s free energy change, entropy change and enthalpy change associated with the complexation reactions were calculated.
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