“…Three closely related, macrocyclic, tridentate, pyridine derivative NS2 ligands, 16-aza-3,10-dithiabicyclo[10. 3.1]hexadeca-l- (16), 12,14-triene, 14-aza-3,8-dithiabicyclo[8. 3.1 ]tetradeca--4), 10,12-triene, 13-aza-3,7-dithiabicyclo[7.3.1 ]trideca-1-(13),9,11-triene, were also reported by us.2 All of them contain the same coordinating elements, (NS2), structurally placed in the same fashion, sulfur-methylene-pyridine-methylene-sulfur, while the macrocyclic chain is purely aliphatic in these cases.…”