The first example of a coordination polymer from the expanded 4,4′-bipyridine ligand [Ru(pytpy) ₂ ] ²⁺ (pytpy = 4′-(4-pyridyl)-2,2′∶6′,2″-terpyridine)

The complex cation ligand [Ru(pytpy)2]2+ (pytpy = 4′-(4-pyridyl)-2,2′∶6′,2″-terpyridine) is an expanded 4,4′-bipyridine; we describe the first example of a coordination polymer in which [Ru(pytpy)2]2+ plays the role of a bridging bidentate ligand.