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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+
