Pentamethylcyclopentadienyl ruthenium(II) complexes of para-substituted N-(pyrid-2-ylmethylene)-phenylamine ligands: syntheses, spectral and structural studies

Pentamethylcyclopentadienyl ruthenium(II) complexes containing N,N′ donor Schiff base ligands of the formulation [(η5-C5Me5)Ru(PPh3)(C5H4N-2-CHN-C6H4-p-X)]PF6 [3a]PF6-[3f]PF6 (where C5Me5 = pentamethylcyclopentadienyl, X = H, [3a]PF6; Me, [3b]PF6; OMe, [3c]PF6; NO2, [3d]PF6; Cl, [3e]PF6; COOH, [3f]PF6) were prepared by reacting the complex [(η5-C5Me5)Ru(PPh3)2(CH3CN)]PF6 with the appropriate ligands (ppa) in methanol.