Synthesis and characterization of some metal complexes with new nitrogen-oxygen donor macrocyclic ligands - X-ray crystal structures of a 26-memberedreduced monoprotonated macrocycle and a 20-membered pendant-arm schiff-base macrocyclic cadmium(II) complex

New series of macrocyclic Schiff-base lanthanide(III), yttrium(III), and ca dmium(II) complexes, [M(1)]X-n (X = NO3-, M = Y, Ln = La-Yb except Pm and D y; X = ClO4-, M = Cd, La, Ce, Pr, Sm, Gd, or Er) and [M(3)]X-n (X = NO3-, M = Dy; X = ClO4-, M = Er and Cd), have been prepared by cyclocondensation o f O-1,O-7-bis(2-formylphenyl)-1,4,7-trioxaheptane with O-1,O-7-bis(2-aninyl )-1,4,7-trioxaheptane (1) or tris(2-aminoethyl)amine (3) in the presence of the appropriate metal salt as a template agent. The Schiff-base macrocycle s 1 and 3 are also formed in the absence of a metal ion. Treatment of 1 wit h NaBH4 in methanol gives the diamine macrocycle 2. The reactions of Ln(III ), Cd-II, and Y-III ions with 2 have also been investigated. The crystal st ructures of the monoprotonated ligand 2 and of the complex [Cd(3)](ClO4)(2) have been determined by X-ray diffraction analysis.