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

Abstract

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.