Iron(II) versus osmium(II) oxidation in 1,1′-bis(diorganophosphino)ferrocene–osmium(II) complexes
摘要:
The compounds [(Cym)OsCl(dxpf)](PF6), Cym = p-cymene and dxpf: 1,1'-bis(diphenylphosphino)ferrocene (dppf), 1, 1'-bis(diethylphosphino)ferrocene (depf) or 1,1'-bis(diisopropylphosphino)ferrocene (dippf), were synthesized and characterized by NMR (H-1, P-31) and, in the case of [(Cym)OsCl(dppf](PF6), by X-ray structure analysis of the acetonitrile solvate. EPR and UV-vis spectroelectrochemistry indicate the formation of an osmium(II)-ferrocenium species on reversible one-electron oxidation. The second oxidation and the reduction are electrochemically irreversible. (C) 2001 Elsevier Science B.V. All rights reserved.