Synthesis and catalytic properties in the hydrogenation reaction of new iridium(I) NHC complexes
University of Debrecen, Institute of Physical Chemistry, POB 7, Debrecen H-4010, Hungary
N-Heterocyclic carbenes are universal ligands in organometallic and inorganic coordination chemistry. In addition to transition metals in low or high oxidation states, N-heterocyclic carbenes form complexes also with main group metals. The large number of NHC compounds allowed improved catalytic applications . From the [IrCl(bmim)(cod)] (bmim = 1-butyl-3-methylimidazol-2-yliden; cod = 1,5-cyclooctadiene) neutral compound we have synthesized new water soluble complexes: [Ir(bmim)(cod)(P)], [Ir(bmim)(cod)(S)]CF3SO3 and [IrH2(bmim)(NCMe)2(mtppts)]Cl, (P= mtppms, mtppds, mtppts; mtppts = 3,3’,3’’- trisulfonated triphenylphosphine, mtppds = 3,3’’- disulfonated triphenylphosphine mtppms = 3-diphenylphosphinobenzenesulfonic acid, S = solvent). All these compounds were characterised by NMR, ESI, and IR, and for [IrCl(bmim)(cod)] and [Ir(bmim)(cod)(H2O)]CF3SO3 the crystal structures have been determined by X-ray diffraction. These complexes were used as catalyst precursors in hydrogenation reactions in organic solvents and in water. Generally these compounds showed good catalytic activity.
 W.A. Herrmann, Angew. Chem. Int. Ed. 2002, 41, 1290;
Presentation: Poster at COST D30 Final Evaluation Meeting, by Henrietta Horvath
See On-line Journal of COST D30 Final Evaluation Meeting
Submitted: 2007-10-22 19:30 Revised: 2009-06-07 00:44