AZAOXA MACROCYCLIC AND ACYCLIC COMPLEXES OF LANTHANIDES

The template reactions of 2,6-diacetylpyridine with 3,6-dioxaoctane-1, 8-diamine in the presence of dysprosium(III), thulium(III) and lutetiu m(III) chlorides and erbium(III) perchlorate produce the complexes of 15-membered macrocyclic ligand with an N3O2 set of donor atoms as a re sult of the [1+1] Schiff base cyclocondensation. In contrast, analogou s reactions involving the lighter lanthanide ions (lanthanum(III), sam arium(III) and europium(III)) yield the acyclic complexes with termina l acetylpyridyl groupings as products of the partial [2+1] condensatio n. The complexes were characterized by spectral data (IR, UV-VIS, H-1 NMR, MS), and thermogravimetric and elemental analyses.