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.

References:

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

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