Synthesis and co-ordination chemistry of 1-(2′,2″-bipyridyl-6′-ylmethyl)-1,4,7-triazacyclononane, a penta-azamacrocycle based on a triazamacrocycle with a single pendent co-ordinating bipyridyl group

Abstract

New penta- and hexa-azamacrocycles have been synthesised, based on tri- and tetra-azamacrocycles functionalised with a single pendent co-ordinating 2,2′-bipyridyl-6-ylmethyl-arm; for the quinquedentate ligand 1-(2′,2″-bipyridyl-6′-ylmethyl)-1,4,7-triazacyclononane, the formation of a six-co-ordinate complex of Ni²⁺, and a seven-co-ordinate complex of Zn²⁺ has been established by X-ray crystallography, and a five-co-ordinate complex of Pd²⁺ established by ¹³C n.m.r. and fast atom bombardment mass spectroscopy.