Chromium (III)-bis(iminophosphoranyl)methanido complexes: synthesis, X-ray crystal structures and catalytic ethylene oligomerization

Christian Klemps (1) , Antoine Buchard (1) , Romaric Houdard (1) , Audrey Auffrant (1) , Nicolas Mézailles (1) , X. F Le Goff (1) , Louis Ricard (1) , Lucien Saussine (2) , L. Magna (2) , Pascal Le Floch (1)

1 DCPH - Laboratoire Hétéroéléments et Coordination
2 IFPEN - IFP Energies nouvelles

Bis(aminophoshonium) salts derived from bis(diphenylphosphino)methane were prepared and triply deprotonated with potassium hexamethyldisilazane to yield the corresponding bis(iminophosphoranyl)methanides, which were then subjected to coordination with CrIIICl3(THF)3. Binuclear complexes of type [(HC(PPh2NR)2Cr(-Cl)(Cl))2] (R = iPr, tBu) with an octahedral coordination geometry and a long C–Cr bond were obtained and structurally characterized. In the case of R = o-MeO-C6H4, a monomeric species featuring no C–Cr bond is observed. Preliminary evaluation of catalytic activities of these complexes in ethylene oligomerization and polymerization is reported.

Domaines: Chimie de coordination; Catalyse

Christian Klemps, Antoine Buchard, Romaric Houdard, Audrey Auffrant, Nicolas Mézailles, et al.. Chromium (III)-bis(iminophosphoranyl)methanido complexes: synthesis, X-ray crystal structures and catalytic ethylene oligomerization. New Journal of Chemistry, 2009, 33, pp.1748-1752. ⟨10.1039/b904619d⟩. ⟨hal-00411472⟩