Popis: |
Lanthanide(III) complexes of six-nitrogen-donor macrocyclic ligands carrying a benzyl-type group, CH2C6H4X (X=H, OH, or NH2), at each di-imine side chain were synthesized by the metal-templated, cyclic Schiff-base condensation of 2,6-diacetylpyridine with substituted S- or R,S-1,2-diaminopropanes. The complexes were obtained as mixtures of constitutional isomers and stereoisomers, which were identified by 1H NMR spectra and separated by fractional crystallization. The molecular structure of the 11-coordinate complex [La(NO3)2(H2O)(C36H38N6)](NO3)(H2O) was established by X-ray crystallography. |