2,2′:6′,2″-Terpyridine (terpy) forms octahedral complexes fac-[ReBr(CO)3(terpy)], cis-[W(CO)4(terpy)] and fac-[PtClMe3(terpy)] in which the ligand oscillates between equivalent bidentate forms by a mechanism involving a ‘tick-tock’ twist of the metal moiety through an angle equal to the N–M–N angle of the octahedral centre and involving a seven-coordinate metal intermediate.
E. W. Abel, N. J. Long, K. G. Orrell, A. G. Osborne, H. M. Pain and V. Šik, J. Chem. Soc., Chem. Commun., 1992, 303 DOI: 10.1039/C39920000303
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