Published Paper Details:

Conductometric titration curves of Erbium(III)-complexes with Nitrogen and Oxygen containing ligand Indole derivative [viz : 1H-indole -3-carboxylic acid (I3CA) , 1-( 1H-indole-3-yl) ethanone (3ATI), 1H-indole-3-carbaldehyde (I3CD), 2-(1H-indole-3-yl)ethanoic acid (2IEA), 4-(1H-indole-3-yl)butanoic acid (4IBA)] have been studied and analyzed in non-micellar solvent (Alcohol+water) and micellar surfactant medium [Polyethylene glycol monododecyl ether (BRIJ35), Cetyltrimethylammonium bromide (CTAB), Sodium dodecyl sulphate (SDS)] at 298 K temperature. The Association constant KA , Gibbs free energy of association ?GA , formation constant or stability constant Kf as logKf and Gibbs free energy of formation ?Gf have been calculated with the help of Conductometric titration curves of Erbium(III)-with Indole derivative (I3CA, 3ATI, I3CD 2IEA, 4IBA) at 298 K temperature in non-micellar medium and different micellar surfactant medium. Metal-ligand complexes in 1:1, 1:2, 1:3 [M:L] ratio is obtained as inflammation point in the plot of molar conductance ?m (S cm2 mol-1) and ligand/metal [L]t / [M]t ratio. Stability of 1:1, 1:2, 1:3 [M:L] metal ligand complexes have been evaluated in term of formation constant as logKf and thermodynamic parameter ?Gf. Stability of Erbium(III)-complexes shows somewhat different behaviour on increasing the ligand/metal [L]t / [M]t ratio and alteration of different micellar medium.