New mononuclear ruthenium complexes of η5-cyclichydrocarbon containing azine ligands: Syntheses, spectral and structural studies

A series of mononuclear indenyl and pentamethylcyclopentadienyl ruthenium(II) complexes of formulation [(η5-L3)Ru(PPh3)(L2)]X, (where L3 =indenyl, pentamethylcyclopentadienyl; X=PF6 or BF4 and L2 =azine ligands) have been prepared by the reaction of [(η5-L3)Ru(PPh3)2(CH3CN)]X with the appropriate azine ligands in methanol or dichloromethane/benzene mixture. The reaction of nitro substituted azine ligands with the complexes [(η5-L3)Ru(PPh3)2(CH3CN)]X are solvent dependent. All these complexes were isolated as their PF6 or BF4 salts. The complexes were fully characterized with the help of microanalyses, FT-IR and NMR spectroscopy. The molecular structure of representative complexes 5c and 6a were established by single X-ray crystallography.