The preparation and co-ordination chemistry of 2,2′ : 6′,2″-terpyridine macrocycles. Part 5. Unsubstituted fifteen-membered-ring macrocycles containing 2,2′: 6′,2″-terpyridine

Abstract

The preparation of a simple unsubstituted quinquedentate macrocycle incorporating a 2,2′: 6′,2″-terpyridine moiety by a transient template reaction is described. The cobalt(II), nickel(II), copper (II), and zinc(II) complexes of the ligand are described, as is the oxidation–reduction chemistry of these compounds. E.s.r. studies indicate that pentagonal-bipyramidal complexes, with solvent molecules occupying the axial sites, are formed.