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Phosphorescent C ∧ C* Cyclometalated Pt II Dibenzofuranyl‐NHC Complexes – An Auxiliary Ligand Study
Author(s) -
Tronnier Alexander,
Nischan Nicole,
Metz Stefan,
Wagenblast Gerhard,
Münster Ingo,
Strassner Thomas
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201301398
Subject(s) - chemistry , phosphorescence , ligand (biochemistry) , denticity , heteronuclear single quantum coherence spectroscopy , crystallography , chelation , thermal stability , photoluminescence , photochemistry , two dimensional nuclear magnetic resonance spectroscopy , stereochemistry , fluorescence , crystal structure , inorganic chemistry , organic chemistry , materials science , physics , biochemistry , receptor , optoelectronics , quantum mechanics
Neutral C ∧ C* cyclometalated Pt II NHC complexes have recently emerged as a new class of phosphorescent emitters with high quantum efficiencies, short decay lifetimes and high thermal stability, which makes them promising candidates for OLED applications. Herein, we report investigations on the photophysical properties of seven new Pt II complexes containing a chelating NHC dibenzofuranyl ligand (3‐methyl‐1‐dibenzo[ b , d ]furan‐4‐ylimidazole) and a bidentate monoanionic auxiliary ligand. All complexes have been fully characterized including extensive NMR studies (COSY, HSQC, HMBC, NOESY, 195 Pt NMR), three of them also by solid‐state structures. The extraordinary influence of the auxiliary ligands on the photoluminescence properties is demonstrated by quantum yields ranging from 0 % to 91 % in amorphous PMMA films at room temperature. DFT calculations were performed in order to investigate the nature of the emissive states in more detail.