Macrocyclic helicates: complexes of a 34-membered Schiff-base ligand
Abstract
A unique double helical macrocyclic configuration of a new 34-membered Schiff-base macrocycle results from convergence of its two pyridine-2,6-diyldiimine units for meridional coordination of divalent metal ions; X-ray structure analysis establishes the cobalt(II), nickel(II) and zinc(II) complexes as the first structurally characterised macrocyclic helicates.