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Transition Metal Complexes of Anionic N-Heterocyclic Dicarbene Ligands


  • We thank the EPSRC and the University of Oxford for financial support of this research (DTA studentships to R.S.P.T. and M.I.) and the University of Oxford for access to Chemical Crystallography and Oxford Supercomputing Centre facilities. We also thank Elemental Microanalysis Ltd. (Devon) for performing the elemental analyses.


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A tale of two carbenes: Reaction of :C[N(2,6-iPr2C6H3)CH]2 (IPr) with Mn3(mes)6 (mes=2,4,6-trimethylphenyl) yielded the trigonal planar complex [Mn(IPr)(mes)2]. Reduction of this species with potassium/graphite in THF afforded the polymeric dicarbene-bridged species K[{:C[N(2,6-iPr2C6H3)]2(CH)C}2Mn(mes)(thf)]⋅THF (see picture). The anionic moiety in this complex is the first reported example of a transition metal complex containing an N-heterocyclic dicarbene ligand. Gray C, blue N, red Mn.