Reactivity studies of cyclopentadienyl bis(triphenylphosphine)ruthenium(II) complex towards some polypyridyl ligands

The reaction of [CpRu(PPh3)2Cl] (1) (Cp=η5-C5H5) with excess of some potentially bridging ligands viz. 2,3-bis(α-pyridyl)pyrazine (bpp), 2,3-bis(α-pyridyl)quinoxaline (bpq), 1,3,5-tris(pyridyl)-2,4,6-triazine (tptz) and 2,3,5,6-tetrakis(pyridyl)pyrazine (tppz) yielded cationic mononuclear complexes of the type [CpRu(PPh3)(bpp)]+ (2), [CpRu(PPh3)(bpq)]+ (3), [CpRu(PPh3)(tptz)]+ (4) and [CpRu(PPh3)(tppz)]+ (5), respectively. These complexes have been isolated as hexafluorophosphate salts. They were characterized by FT-IR, 1H NMR and 31P {1H} NMR spectroscopy. The molecular structures of representative complexes 3 and 5 have been solved by single crystal X-ray crystallography.