The synthesis of three novel pendant armed macrocyclic ligands. The X-ray crystal structure of a cadmium complex derived from the first oxaazamacrocycle bearing two alkylated aromatic amine functions

摘要

Three new macrocyclic ligands derived from 2,6-pyridinedicarbaldehyde have been prepared by N-alkylation of a secondary aliphatic amine and two secondary phenylic amines of the oxaazamacrocycle precursor (L) with p-nitrobenzylbromide and bromoacetonitrole. The trialkylated ligand 2 is the first example of a macrocyclic ligand bearing pendant arms on secondary aromatic amine nitrogens. Complexation reactions of macrocycles 2 and 3 with different hydrated metal salts were carried out in order to investigate the complexation capability of these new pendant arm macrocyclic ligands. The X-ray crystal structures of ligands 1 and 3 and of the cadmium complex of 2 have been obtained.