Syntheses and structural studies of mononuclear arene ruthenium complexes with nitrogen-based chelating ligands

Dinuclear arene ruthenium complexes (η⁶-arene)Ru(μ-Cl)Cl]₂ (arene?=?C₆H₆; p ⁱPrC₆H₄Me; C₆Me₆) and monomeric cyclopentadienyl complexes (η⁵-Cp)Ru(PPh₃)₂Cl] (Cp?=?cyclopentadienyl) react with polypyridyl nitrogen ligands L¹ (3-(pyridin-2-yl)-1H-1,2,4-triazole) and L² (1,3-bis(di-2-pyridylaminomethyl)benzene) in methanol to afford cationic mononuclear compounds (η⁶-arene)Ru(L¹)Cl]⁺ (arene?=?C₆H₆, 1; p ⁱPrC₆H₄Me, 2; C₆Me₆, 3), (η⁶arene)Ru(L²)Cl]⁺ (arene?=?C₆H₆, 4; p ⁱPrC₆H₄Me, 5; C₆Me₆, 6), (η⁵-Cp)Ru(L¹)(PPh₃)]⁺ (7), and (η⁵Cp)Ru(L²)(PPh₃)]⁺ (8). All cationic mononuclear compounds were isolated as their hexafluorophosphate salts and characterized by elemental analyses, NMR, and IR spectroscopic methods and some representative complexes by UV-Vis spectroscopy. The solid state structures of two derivatives, 6]PF₆ and 7]PF₆, have been determined by the X-ray structure analysis.