Synthesis and Characterization of Rare Earth Complexes with a Bis-Schiff Base from Salicylaldehyde and 1,6-Hexanediamine

Abstract

A series of lanthanide(III) complexes of the type [LnL₂Cl₂]Cl, where Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, L = C₂₀H₂₄N₂O₂, a bis-Schiff base ligand derived from salicylaldehyde and 1,6-hexanediamine, have been synthesized and characterized by elemental analyses, molar electrical conductivities, infrared and electronic spectra, thermergravimetric analyses. All the complexes were found to be 1:1 electrolytes of the general empirical formula [LnL₂Cl₂]Cl. The Schiff base ligand behaves as tetradentate ligand having a N₂O₂ donor sets towards the metal cations. A probable coordination number ten has been assigned in these complexes.