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Phosphorescent Platinum(II) Complexes with Mesoionic 1 H ‐1,2,3‐Triazolylidene Ligands
Author(s) -
Soellner Johannes,
Tenne Mario,
Wagenblast Gerhard,
Strassner Thomas
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201601060
Subject(s) - mesoionic , phosphorescence , quantum yield , photoluminescence , platinum , ligand (biochemistry) , chemistry , aryl , carbene , photochemistry , materials science , fluorescence , medicinal chemistry , catalysis , organic chemistry , alkyl , optoelectronics , biochemistry , physics , receptor , quantum mechanics
The synthesis and characterization of eight unprecedented phosphorescent C^C* cyclometalated mesoionic aryl‐1,2,3‐triazolylidene platinum(II) complexes with different β‐diketonate ligands are reported. All compounds proved to be strongly emissive at room temperature in poly(methyl methacrylate) films with an emitter concentration of 2 wt %. The observed photoluminescence properties were strongly dependent on the substitution on the aryl system and the β‐diketonate ligand. Compared to acetylacetonate, the β‐diketonates with aromatic substituents (mesityl and duryl) were found to significantly enhance the quantum yield while simultaneously reducing the emission lifetimes. Characterization was carried out by standard techniques, as well as solid‐state structure determination, which confirmed the binding mode of the carbene ligand. DFT calculations, carried out to predict the emission wavelength with maximum intensity, were in excellent agreement with the (later) obtained experimental data.