期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 23, 页码 6014-6025出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201900489
关键词
carbenes; cyclometalating ligands; luminescence; NHC ligands; platinum
资金
- Spanish Ministerio de Economia y Competitividad [CTQ2015-69568-P]
- Fundacion Seneca [19890/GERM/15, 20398/SF/17]
The synthesis, structure, and photophysical properties of luminescent Pt-IV complexes that combine cyclometalated 1,2,3-triazolylidene and bi- or terdentate 2,6-diarylpyridine ligands are reported. The targeted complexes represent the first examples of Pt-IV species with a cyclometalated mesoionic aryl-NHC ligand. They exhibit moderate or weak emissions in fluid solution at 298 K arising from (LC)-L-3 states, which become very intense in poly(methyl methacrylate) (PMMA) matrices at 298 K. DFT and TD-DFT calculations confirm that the chromophoric ligand is the cyclometalated 2,6-diarylpyridine and show that the aryl-NHC ligand exerts a beneficial effect on the emission efficiencies of these derivatives by increasing the energy of deactivating LMCT excited states with respect to comparable Pt-IV complexes with cyclometalated 2-arylpyridine ligands.
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