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

Author(s): 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.

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