Syntheses and Spectroscopic Studies on Tetraaza Macrocyclic Complexes of Lanthanum(III)

Abstract Lanthanum(III) macrocyclic complexes of types [La(mac1)] Cl3 and [La(mac2)(H2O)2] Cl3 (mac1 = macrocyclic ligands derived by the condensation of diacetyl or benzil with carbohydrazide; mac2 = macrocyclic ligands derived by the condensation of diacetyl or benzil with semicarbazide, thiosemicarbazide or thiocarbohydrazide) have been prepared and characterized by conductance measurements, infrared and 1H and 13C n.m.r spectroscopies and by thermal and elemental analyses.