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.
D. E. Fenton, R. W. Matthews, M. McPartlin, B. P. Murphy, I. J. Scowen and P. A. Tasker, J. Chem. Soc., Chem. Commun., 1994, 1391 DOI: 10.1039/C39940001391
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