Synthetic Approaches to 18-Triazacrown-6 Ether and a Lead Complex of Its Вipyridyl Derivative

In this study, an 18-membered triazacrown ether was prepared using three synthetic approaches to compare their efficiency. The method utilizing the macrocyclization reaction through the formation of a Schiff base turned out to be the most convenient one. The complexing features of new chelator PADPy bearing two pyridyl chelating groups towards Pb2+ ions was studied by ESI MS and 1H NMR spectroscopy. The formation of an inclusive complex of 1:1 composition was shown.