Expanding the 4,4′-bipyridine ligand: Structural variation in {M(pytpy)2}2+ complexes (pytpy = 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine, M = Fe, Ni, Ru) and assembly of the hydrogen-bonded, one-dimensional polymer {[Ru(pytpy)(Hpytpy)]}n3n+

The solid state structures of [Ni(1)2][NO3]2 · 2MeOH · 2H2O, [Fe(1)2][ClO4]2 · 2MeOH · 0.5H2O, [Ru(1)2][PF6]2 and [Ru(1)2][PF6][NO3] (1 = 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine) are presented and the structural variation observed for the {M(1)2}2+ unit is discussed. Protonation of the pendant pyridine group in [Ru(1)2]2+ leads to the formation of a hydrogen-bonded, one-dimensional polymer [{Ru(1)(H1)}n]3n+ exemplifed by the solid-state structure of [{Ru(1)(H1)}{Fe(NCS)6} · 1.25H2O]n.

Graphical abstractStructural diversity in [Ni(pytpy)2][NO3]2 · 2MeOH · 2H2O, [Fe(pytpy)2][ClO4]2 · 2MeOH · 0.5H2O, [Ru(pytpy)2][PF6]2 and [Ru(pytpy)2][PF6][NO3] (pytpy = 4′-(4-pyridyl)-2,2′:6′,2″-terpyridine) is presented; protonation of the pendant pyridine group in [Ru(pytpy)2]2+ generates a hydrogen-bonded, one-dimensional polymer [{Ru(pytpy)(Hpytpy)}n]3n+.Figure optionsDownload full-size imageDownload as PowerPoint slide