Rare earth complexes of a new Schiff base macrocyclic ligand derived from 2,2'-(ethylenedioxy)bisbenzaldehyde and 2,2' -(ethylenedioxy)bisbenzyl amine

Abstract

Reaction of 2,2 -(ethylencdioxy)bisbenzaldehyde with 2,2 -(ethylenedioxy)-bisbenzyl amine in ethanol in the presence of hydrated RE(NO₃)₃ or RE(ClO₄)₃ (RE = rare earth ion) gives

complexes of the type RE(OH)(NO₃)₂L^.2CH₃CH₂OH (RE = La, Pr-Eu), RE(NO₃)₃L· CH₃CH₂OH (RE Ce, Gd), [La(ClO₄)₃]₃L₂^.3CH₃CH₂OH^.H₂O or [RE(ClO₄)₃]₂L^.2CH₃CH₂OH (RE = Ce-Nd), where L is the corresponding Schiff base macrocyclic ligand. All the complexes have been characterized by elemental analyses, IR spectra, TG-DTA and molar conductance measurements. The light rare earth ions have been found to be effective as templates for the synthesis of the 22-membered Schiff base macrocycle.