Complexes of lanthanide ions with a Schiff-base macrocyclic ligand derived from 2,6-diformylpyridine

Abstract

Reaction of 2,6-diformylpyridine with 1,5-bis(2-aminophenoxy)-3-oxapentane in methanol or ethanol in the presence of hydrated Ln(NO₃)₃ or Ln(ClO₄)₃(Ln = lanthanide ion) gave complexes of the type [Ln(NO₃)₃L] or [Ln(ClO₄)₃L] where L is the corresponding Schiff-base macrocyclic ligand. In the absence of the metal salt the macrocycle L is not formed. The complexes were characterized by elemental analysis, molar conductivity, mass, IR and ¹H NMR spectroscopy and thermogravimetric and magnetic measurements.