Abstract
STUDY OF METAL-LIGAND STABILITY CONSTANTS OF La (III), Sm(III) & Nd(III) METAL ION COMPLEXES WITH SUBSTITUTED SCHIFF’S BASES AT 0.1 M IONIC STRENGTH PH- METRICALLY

Truptanjali R. Lawankar*, Devidas T. Mahajan and Syed. Azhar. Quazi

ABSTRACT

In present work, the interaction of La(III), Sm(III) and Nd(III) metal ion with 6,6’((ethane1,2diylbis(azanylylidene))bis(ethan-1-yl-1-ylidene))bis(4-methyl-2-nitrophenol) [L1] and 6,6’((ethane1,2diylbis(azanylylidene))bis(ethan-1-yl-1-ylidene))bis (4-chloro -2-nitrophenol [L2] was investigated at 0.1 M ionic strength (27 ± 0.1 0C) in 70% DMF- water mixture by Bjerrum method as adopted by Calvin and Wilson . It is observed that La (III), Sm(III) and Nd(III) metal ions forms 1:1 & 1:2 complexes with Schiff base ligand . The substituted Schiff bases show formation of simultaneous complexes. From estimated data (pK & log K), the effect of substituents were studied.

Keywords: Schiff base, Metals ions La (III), Sm(III) and Nd(III) , DMF-Water mixture , Stability constant.


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