211488-35-6Relevant academic research and scientific papers
Electron density manipulation in rhodium(I) phosphine complexes: Structure of acetylacetonatocarbonylferrocenyl- diphenylphosphinerhodium(I)
Otto, Stefanus,Roodt, Andreas,Erasmus, Johannes J. C.,Swarts, Jannie C.
, p. 2447 - 2453 (1998)
The title complex [Rh(acac)(CO)(PPh2Fc)] (acac = acetylacetonato, PPh2Fc = ferrocenyldiphenylphosphine), was obtained in acetone by reaction of the tertiary phosphine with [Rh(acac)(CO)2] and was characterised by IR spectroscopy, 1H and 31P NMR and single crystal X-ray crystallography. This is a rare example illustrating the incorporation of the ferrocenyl moiety in a monodentate tertiary phosphine complex of rhodium(I). It crystallises in the triclinic space group P1 with two independent molecules in the asymmetric unit and refined to R=2.40% from 5215 reflections. The independent molecules, showing the usual square planar geometry, differ mainly in the rotation mode of the asymmetric phosphine around the Rh-P bond and a slight deviation in the Rh-CO bond from linearity, which was correlated with IR data.
Synthesis, characterization and structure of rhodium(I) carbonyl complexes with O,P-chelating 1'-(diphenylphosphino)ferrocenecarboxylate or P-monodentate 1'-(diphenylphosphino)ferrocenecarboxylic acid
Stepnicka, Petr,Cisarova, Ivana
, p. 2807 - 2812 (2007/10/03)
The reaction of 1'-(diphenylphosphino)ferrocenecarboxylic acid (Hdpf) with (X = Cl or Br) afforded rhodium(I) complexes trans- containing the ligand as the P-bonded phosphine.On the other hand, pentane-2,4-dionato rhodium(I) complexes reacted with Hdpf by an acid-base reaction yielding novel O,P-chelated rhodium(I) complexes and pentane-2,4-dione (Hacac).The compound reacted with 2 equivalents of Hdpf to give trans- which exhibits proton exchange between the two forms of the ligand.Likewise, related complexes , where PR3 = PCy3, PPh3 or PPh2Fc (Cy = cyclohexyl, Fc = ferrocenyl), afforded the corresponding complexes trans-.The formation of the O,P chelates is regioselective and might be considered as a rather unusual displacement of pentane-2,4-dionate by the phosphinocarboxylate dpf with concurrent proton exchange.All the compounds were characterized by 1H, 13C, 31P and IR spectroscopies and by FAB mass spectrometry.The crystal structure determination of trans- confirmed the presence of an unprecedented heteroannular O,P-chelating ferrocene ligand.
