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Phosphorescent Cyclometalated Platinum(II) aNHC Complexes
Author(s) -
Soellner Johannes,
Strassner Thomas
Publication year - 2018
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.201802725
Subject(s) - platinum , denticity , carbene , transmetalation , phosphorescence , chemistry , cyclic voltammetry , ligand (biochemistry) , photochemistry , combinatorial chemistry , crystallography , organic chemistry , electrochemistry , crystal structure , catalysis , electrode , fluorescence , biochemistry , physics , receptor , quantum mechanics
The synthesis and characterization of the first bidentate C^C* cyclometalated platinum( II ) complexes based on abnormal N ‐heterocyclic carbenes (aNHC) is presented. The aNHC ligand precursors are prepared from benzonitriles and anilines to form 1,2,3‐trisubstituted imidazolium salts. The title compounds were synthesized by in situ generation of the silver carbene complex, followed by transmetalation to platinum and subsequent introduction of the β‐diketonate ligand. Structural characterization by 2D NMR experiments, as well as solid‐state structures unequivocally prove the abnormal binding mode of the aNHC ligands. Additionally, the photophysical properties of the platinum( II ) complexes were examined and studied in detail by DFT calculations and cyclic voltammetry experiments. The title compounds proved to be strongly emissive at room temperature in the green to orange region of the visible spectrum, with emission efficiencies of up to 69 %.