Synthesis, x-ray structure and electrochemical oxidation of palladium(II) complexes of ferrocenyldiphenylphosphine

Martin Bennett, Suresh Bhargava, Alan Bond, I Burgar, SiXuan Guo, Gopa Kar, Steven Priver, Jorg Wagler, Anthony Willis, Angel Torriero

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Four new complexes, [PdX(kappa(2)-2-C6R4PPh2)(PPh(2)Fc)] [X = Br, R = H (1), R = F (2); X = I, R = H (3), R = F (4)], containing ferrocenyldiphenylphosphine (PPh2Fc) have been prepared and fully characterised. The X-ray structures of complexes trans-1, cis-2 and cis-4, and that of a decomposition product of 4, [Pd(kappa(2)-2-C6F4PPh2)(mu-I)(mu-2-C6F4PPh2)PdI(PPh(2)Fc)] (5), have been determined. These complexes show a distorted square planar geometry about the metal atom, the bite angles of the chelate ligands being about 69 degrees, as expected. The cis/trans ratio of 1-4 in solution is strongly dependent on solvent. The new complexes and the uncoordinated PPh(2)Fc ligand were electrochemically characterised by cyclic and rotating disk voltammetry, UV-visible spectroelectrochemistry, and bulk electrolysis in dichloromethane and acetonitrile. In both cases, oxidation occurs at both the ferrocene and phosphine centres, but the complexes oxidise at more positive potentials than uncoordinated PPh(2)Fc; subsequently, the metal-phosphorus bond is cleaved, leading to free PPh(2)Fc(+), which undergoes further chemical and electrochemical reactions.
Original languageEnglish
Pages (from-to)9079 - 9090
Number of pages12
JournalDalton Transactions
Issue number38
Publication statusPublished - 2010

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