作者:Stefanus Otto
DOI:10.1016/j.ica.2010.06.020
日期:2010.10
The substitution behaviour of [PtCl(R)(COD)] (R- = Me and Fc) complexes, by the stepwise addition of phosphine ligands, L (L = PPh3, PEt3 and P(NMe2)(3)), were investigated in situ by H-1 and P-31 NMR spectroscopy. Addition of less than two equivalents of the phosphine ligand results in the formation of dimeric molecules with the general formula trans-[Pt(R)(mu-Cl)(L)](2) for the sterically demanding systems where R- = Me/L = P(NMe2)(3) and R- = Fc/L = PEt3, PPh3 and P(NMe2)(3) while larger quantities resulted in cis-and trans mixtures of mononuclear complexes being formed. In the case of the relatively small steric demanding, strongly coordinating, PEt3 ligand the trans-[PtCl(R)(PEt3)(2)] mononuclear complexes were exclusively observed in both cases. The crystal structures of the two substrates, [PtCl(R)(COD)] (R- = Me or Fc), as well as the cis-[PtCl(Fc)(PPh3)(2)] substitution product are reported. (C) 2010 Elsevier B.V. All rights reserved.