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Title: Thermodynamics of complex formation of rare earth metal ions with schiff bases in mixed solvent media
Authors: Chondhekar, T K
Dhuley, D G
Issue Date: Nov-1989
Publisher: NISCAIR-CSIR, India
Abstract: Proton-ligand stability constants of N-phenyl-2-hydroxy- 5- chioroacetophenoneimine(I) and N-ɑ-naphthyl- 2-hydroxy- 5-chioroacetophenoneimine(II) and metal-ligand stability constants of their complexes with La(III), Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(I1I), Dy(III) and Yb(III) have been determined at 25°, 35° and 50°C (± 0.02°C) and and μ =0.l M(NaClO4) in 60% ethanol-water medium. The thermodynamic parameters for the formation of 1:1 and 1:2 complexes have been calculated. The metal complexes of the ligand(I) are observed to be enthalpy- and entropy-stabilized. However, the positive values of enthalpy and entropy changes in the case of the 1:2 complexes of ligand(II) show the predominance of the entropy effect.
Page(s): 1014-1015
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.28A(11) [November 1989]

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