Study of novel η5-cyclopentadienyl and η6-arene platinum group metal complexes containing a N4-type ligand and their structural characterization
摘要:
The mononuclear eta(5)-cyclopentadienyl complexes [(eta(5)-C5H5)Ru(PPh3)(2)Cl]. [(eta(5)-C5H5)Os(PPh3)(2)Br] and pentamethylcyclopentadienyl complex [(eta(5)-C5Me5)Ru(PPh3)(2)Cl] react in the presence of 1 eq. of the tetradentate N,N'-chelating ligand 3,5-bis(2-pyridyl)pyrazole (bpp-H) and 1 eq. of NH4PF6 in methanol to afford the mononuclear complexes [(eta(5)-C5H5)Ru(PPh3)(bpp-H)]PF6 ([1]PF6), [(eta(5)-C5H5)Os(PPh3)(bpp-H)]PF6 ([2]PF6) and [(eta(5)-C5Me5)Ru(PPh3)(bpp-H)]PF6 ([3]PF6), respectively. The dinuclear eta(5)-pentamethylcyclopentadienyl complexes [(eta(5)-C5Me5)Rh(mu-Cl)Cl](2) and [(eta(5)-C5Me5)Ir(mu-Cl)Cl](2) as well as the dinuclear eta(6)-arene ruthenium complexes [(eta(6)-C6H6)Ru(mu-Cl)Cl](2) and [(eta(6)-p-(PrC6H4Me)-Pr-i)Ru(mu-Cl)Cl](2) react with 2 eq. of bpp-H in the presence of NH4PF6 or NH4BF4 to afford the corresponding mononuclear complexes [(eta(5)-C5Me5)Rh(bpp-H)Cl]PF6 ([4]PF6), [(eta(5)-C5Me5)Ir(bpp-H)Cl]PF6 ([5]PF6), [(eta(6)-C6H6)Ru(bpp-H)Cl]BF4 ([6]8F(4)) and [(eta(6)-p-(PrC6H4Me)-Pr-i)Ru(bpp-H)Cl]BF4 ([7]BF4). However, in the presence of 1 eq. of bpp-H and NH4BF4 the reaction with the same eta(6)-arene ruthenium complexes affords the dinuclear salts [(eta(6)-C6H6)(2)Ru-2(bpp)Cl-2]BF4 ([8]BF4) and [(eta(6)-p-(PrC6H4Me)-Pr-i)(2)Ru-2(bpp)Cl-2]BF4 ([9]BF4), respectively. These compounds have been characterized by IR, NMR and mass spectrometry. as well as by elemental analysis. The molecular structures of [1]PF6, [5]PF6 and [8]BF4 have been established by single crystal X-ray diffraction studies and some representative complexes have been studied by UV-vis spectroscopy. (C) 2009 Elsevier Ltd. All rights reserved.