LANTHANIDE(III) COMPLEXES OF 2 OXAAZADIAMINE MACROCYCLIC LIGANDS DERIVED FROM 2,6-DIFORMYLPYRIDINE - THE CRYSTAL-STRUCTURES OF A REDUCED MACROCYCLIC LIGAND AND THE CORRESPONDING DIPROTONATED MACROCYCLE

New macrocyclic lanthanide(III) complexes were obtained with two oxaaz adiamine macrocycles derived from 2,6-diformylpyridine: (i) mononuclea r complexes of an 18-membered sexidentate N3O3 macrocycle (L-1) derive d from 1,5-bis(2-aminophenoxy)-3-oxapentane; (ii) mononuclear complexe s of a 16-membered pentadentate N3O2 macrocycle (L-2) derived from 1,3 -bis(2-aminophenoxy)propane. The complexes were characterized by eleme ntal analysis, molar conductivity, mass spectrometry, IR and H-1 NMR s pectroscopy, thermogravimetry and magnetic measurements. The crystal s tructures of the L2 macrocycle and the corresponding diprotonated liga nd are also reported. (C) 1998 EIsevier Science S.A. All rights reserv ed.