Abstract
Lanthanide(III) complexes of diphenylcarbazone (DPC) and its substituted derivative di(2. 3-dichlorophenyl)carbazonc (D2,3DC1PC) of the composition Ln[(DPC)2(NO3)2]NO3·2H2O and Ln[(D2,3DC1PC)2(NO3)2]NO3·2H2O have been prepared and characterized on the basis of elemental analyses, molar conductance, magnetic measurements, electronic, infrared and 1H NMR spectral techniques. The molar conductance of the complexes in DMF suggests them to be 1:1 electrolytes. The diphenylcarbazones behave as bidentate neutral ligands coordinating through the ketonic oxygen and azo nitrogen. Thermal studies show the presence of water molecules outside the coordination sphere. It has been observed that the ligands and their complexes are toxic towards bacteria and fungi. Potentiometric studies have been carried out by the method of Bjerrum and Calvin, as modified by Irving and Rossotti, in 50% (v/v) dioxane-waler (μ = 0.1 M NaClO4) at 25°. 35° and 45°C. The thermodynamic parameters viz., ΔG°. AH” and δ DS° of the metal chelates have also been evaluated. The validity of Born's relation was examined by studying the plot of log K 1 values vs Z2/r.
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