Journal
ORGANOMETALLICS
Volume 36, Issue 13, Pages 2397-2403Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.organomet.7b00354
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Funding
- Swiss Federal Office for Energy [563074]
- European Commission [643791]
- Swiss State Secretariat for Education, Research and Innovation (SERI)
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In the search of new ligand environment for the ruthenium(II) complexes with pyridine-type ligands, we developed seven new cyclometalated ruthenium complexes with N-heterocyclic carbenes (NHCs). In a two-step procedure, we synthesized complexes with the general formula [Ru(NHC<^>C)(bpyR(2))(2)](PF6), where NHC<^>C is a bidentate ligand coordinating with the carbene and cyclometalation; bpyR(2) is either 2,2'-bipyridine, when R = H, or 4,4'-dimethoxycarbonyl-2,2'-bipyridine, when R = CO2Me. To investigate the photophysical properties of these complexes, various NHC and cyclometalated ligands of different electron donating potency were used. The new compounds were characterized by H-1, C-13, and COSY NMR methods, cyclic voltammetry, absorption spectroscopy, and single crystal X-ray crystallography. These complexes exhibit perfect redox reversibility, and in contrast to the reported analogues without cyclometalation, they do not have photoemission in solution.
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