Synthesis and catalytic properties in the hydrogenation reaction of new iridium(I) NHC complexes 

Henrietta Horvath 

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 [1]. 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.


[1] W.A. Herrmann, Angew. Chem. Int. Ed. 2002, 41, 1290;


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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