New mononuclear ruthenium complexes of η 5-cyclichydrocarbon containing azine ligands: Syntheses, spectral and structural studies

Abstract

A series of mononuclear indenyl and pentamethylcyclopentadienyl ruthenium(II) complexes of formulation [(η 5-L 3)Ru(PPh 3)(L 2)]X, (where L 3 = indenyl, pentamethylcyclopentadienyl; X = PF 6 or BF 4 and L 2 = azine ligands) have been prepared by the reaction of [(η 5-L 3)Ru(PPh 3) 2(CH 3CN)]X with the appropriate azine ligands in methanol or dichloromethane/benzene mixture. The reaction of nitro substituted azine ligands with the complexes [(η 5-L 3)Ru(PPh 3) 2(CH 3CN)]X are solvent dependent. All these complexes were isolated as their PF 6 or BF 4 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.