Synthesis and Photophysical Characterization of Cyclometalated Ruthenium Complexes with N-Heterocyclic Carbene Ligands

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.


Published in:
Organometallics, 36, 13, 2397-2403
Year:
2017
Publisher:
Washington, American Chemical Society
ISSN:
0276-7333
Laboratories:




 Record created 2017-09-05, last modified 2018-03-17


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)