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Phosphorescent Cyclometalated Platinum(II) Imidazolinylidene Complexes
Author(s) -
Stipurin Sergej,
Strassner Thomas
Publication year - 2021
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.202001077
Subject(s) - chemistry , carbene , platinum , transmetalation , denticity , phosphorescence , photochemistry , aryl , electrochemistry , ligand (biochemistry) , combinatorial chemistry , crystallography , organic chemistry , fluorescence , catalysis , crystal structure , electrode , quantum mechanics , biochemistry , physics , alkyl , receptor
We present the synthesis and characterization of six novel bidentateC ∧ C*cyclometalated platinum( ii ) complexes derived from saturated N ‐heterocyclic carbene precursors, namely 1‐aryl‐3‐methyl‐1 H ‐4,5‐dihydroimidazolium salts. The title compounds were then synthesized by a multi‐step reaction, which includes an in situ generation of the silver carbene complex, followed by transmetalation to platinum and subsequent introduction of the β‐diketonate ligand. Structural characterization by NMR experiments and solid‐state structures prove the cyclometalation and the saturated backbone of the NHC motif. Photophysical and electrochemical properties of the platinum( ii ) complexes were examined and studied in detail by DFT calculations. The title compounds are strongly emissive at room temperature in the sky‐blue region of the visible spectrum and show quantum yields of up to 71 % in a PMMA matrix.