Characterization and Formation Constants of La(III), Ce(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Dy(III), Ho(III), Er(III), Tm(III), Yb(III) and Lu(III) Complexes of Schiff Base Derived from Sulphanilamide and Salicylaldehyde
A few lanthanide complexes of the type ML3*2H2O where LH is a schiff base derived from sulphanilamide and salicylaldehyde have been synthesized and characterized on the basis of their elemental analysis, infrared spectra and molar conductance measurements.The schiff base acts as a monobasic bidentate ligand and the complexes appear to be eight coordinated.The pH-metric studies have been carried out to determine the proton-ligand stability constants of the ligand and metal-ligand stability constants of its complexes at 25 deg C and 0.1 M ionic strength.The stability constants of these rare earth complexes follow the order: Ce > Dy > Pr > Lu > Tm > Eu > La > Yb > Er > Nd > Ho > Tb > Sm > Gd.
Khan, L. A.,Siddiqi, K. S.,Khan, N. H.,Kureshy, R. I.,Zaidi, S. A. A.
p. 969 - 971
(2007/10/02)
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