Studies on the Coordination Behaviour of a Polydentate Schiff Base in Presence of Dimethyl Sulphoxide on Rare Earth Metal Ions

Abstract

The present investigation is concerned with the studies on the
coordination behaviour of Schiff base of pyridine-2-carboxaldehyde
and 4-aminoantipyrine in presence of oxygen donor ligands such
as dimethyl sulphoxide. Mixed ligand complexes of the lanthanide
ions viz., La³⁺, Pr³⁺, Nd³⁺, Sm³⁺, Gd³⁺ and Dy³⁺ with Schiff base
and dimethyl sulphoxide have been synthesised and characterized.
The analytical data include elemental analysis, molecular weight
determination, conductivity, magnetic moment, spectral, thermal
and antimicrobial studies. The compositions of these complexes are
found to be [Ln(P₂CAAP)(DMSO)(NO₃)₃  where Ln = La, Pr, Nd,
Sm, Gd and Dy. In these complexes the primary ligand acts as a
neutral bidentate ligand; the secondary ligands viz., DMSO and the
monovalent nitrate anion act as unidentate.