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Study of the StabIlity Constant of the Lanthanide (III) Ion Complexes with Schiff Bases

S. G. Shankarwar, A. G. Shankarwar, R. P. Phase and T. K. Chondhekar

The present work is undertaken to make a systematic solution study of the complex formation of lanthanide (III) ions with the Schiff bases synthesized from salicylhydrazide with (i) 4- methoxy benzaledehde (ii) 3,4,5, trimethoxybenzaledehde and (iii) furfuraladehyde. The stability constants of their complexes with lanthanides (III) ions have been determined at 30 ± 0.1ºC potentiometrically in 40% THF-water mixture and 0.1M (NaClO4) ionic strength. The lanthanides form 1 : 1 and 1 : 2 complexes with all the Schiff bases and log k values show a break at gadolinium.