The ligand 4′-(4‴-pyridyl)-2,2′ : 6′,2″-terpyridine (pyterpy) acts as a tridentate ligand in which the 4-pyridyl ring is not co-ordinated in the complex cation [Fe(pyterpy)2]2+; the non-co-ordinated ring reacts with electrophiles to give species in which the charge perturbations are localised to a ‘4,4′-bipyridyl’ fragment.
E. C. Constable and A. M. W. C. Thompson, J. Chem. Soc., Dalton Trans., 1992, 2947 DOI: 10.1039/DT9920002947
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