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Ruthenium(II) Bipyridyl Complexes with Cyclometalated NHC Ligands

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journal contribution
posted on 06.06.2017, 17:31 by David Schleicher, Hendrik Leopold, Horst Borrmann, Thomas Strassner
We present the synthesis and characterization of novel cyclometalated ruthenium N-heterocyclic carbene (NHC) complexes of the general formula [Ru­(C^C*)­(bpy)2]­PF6 (bpy = 2,2′-bipyridine), with the C^C* ligand being based on different 1-phenylimidazoles. They were synthesized in a one-pot procedure starting from the corresponding p-cymene NHC complexes [Ru­(C^C*)­(p-cymene)­Cl]. Their structural, spectroscopic, and electrochemical properties were investigated by NMR, X-ray, UV/vis, and CV, as well as density functional theory methods. Because of the stronger electron-donating carbene ligands, these complexes represent a new class of bisheteroleptic dyes with improved photophysical and electrochemical properties.

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