Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 21, Pages 5584-5590Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201705738
Keywords
excited state; mesoionic; OLEDs; phosphorescence; platinum
Categories
Funding
- Studienstiftung des Deutschen Volkes
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Control of the excited state geometry by rational ligand design leads to a new class of phosphorescent emitters with extraordinary photophysical properties. Extension of the pi-system in the triplet state leading to a significant bathochromic shift of the emission was avoided by introduction of additional steric demand. We report the synthesis, characterization and photophysical properties of novel platinum(II) complexes bearing C boolean AND C* cyclometalated mesoionic carbene (MIC) with different beta-diketonate ligands. The MIC ligand precursors were prepared from 1-phenyl-1,2,3-triazole using arylation protocols, introducing phenyl or mesityl functionalities. A solid state structure confirming the NMR assignments is presented. The emission properties were investigated in detail at room temperature and 77 K and are supported by DFT calculations and cyclic voltammetry. All complexes, with emission maxima between 502-534 nm, emit with quantum efficiencies ranging from 70-84% in PMMA films.
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