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A new phenanthrene-fused N-heterocyclic carbene was generated and characterized in solution. The synthesis of air-stable Rh, Ir, and Ag complexes, supported by the new phenanthrene-fused imidazol-2-ylidene ligand, is described. Deprotonation of phenanthrene-fused imidazolium salt 4 in the presence of [M(COD)Cl] 2 (M = Rh, Ir) afforded complexes 6 and 7 in excellent yields. The silver complex was obtained by reaction of 4 with Ag 2 O. The solid state molecular structures of these complexes have been determined by X-ray diffraction studies. The fluorescence emission spectra of 4, 6, and 7 are compared to that of phenanthrene.
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Tapu et al. (2008) studied this question.
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