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Two Different, Metal-Dependent Coordination Modes of a Dicarbene Ligand

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journal contribution
posted on 11.11.2013, 00:00 by Ramananda Maity, Arnab Rit, Christian Schulte to Brinke, Jutta Kösters, F. Ekkehardt Hahn
The bisimidazolium salt H2-1(PF6)2 featuring a bridging 1,4-phenylene group reacts with 0.5 equiv of [PdCl­(allyl)]2 in the presence of Cs2CO3 to give the dinuclear complex [2]­(PF6)2, whereas the reaction of the same bisimidazolium salt with 0.5 equiv of [Ir­(Cl)2(Cp*)]2 yields the mononuclear orthometalated complex [3]­PF6 with one remaining imidazolium unit. The unreacted imidazolium group in complex [3]­PF6, however, can also be metalated with RhIII to yield the doubly orthometalated heterobimetallic complex [4]. In complex [4], each MIII center (M = IrIII and RhIII) is coordinated by one NHC unit and orthometalates the central aryl ring of the ligand.