Spectral and magnetic properties of macroacyclic and macrobicyclic Schiff base RE complexes

Abstract

IR spectroscopic, electrospray ionization mass spectrometry, TG-DTA, structure and magnetic properties of the gadolinium(III), samarium(III) and dysprosium(III) macroacyclic tripodal Schiff base, C27H27N4O3Cl3Gd(Dy, Sm) as well as gadolinium(III) and erbium(III) cryptate C39H47MN9O6 (MGd, Er) complexes are reported. The positions of ν(CN) stretching bonds indicate that the azomethine group nitrogen is coordinated to the rare earth ion. The [1:1] ligand to metal proportion in all macrocyclic and mocrobicyclic Schiff base complex samples has been confirmed by both electron ionization and electron spray molecular spectroscopy spectra. A TG-DTA analysis has indicated the presence of two water molecules in the inner-sphere of the macrobicyclic complex and confirmed that there is no water coordination of the metal ion in the macroacyclic complex. The near neighborhood of cation ions in the complexes of both types and their structure have been proposed on the basis of the above data. The temperature dependence of the EPR spectra integrated intensity has made it possible to reveal magnetic interactions in the spin system of these compounds.