Luminescent Platinum(IV) Complexes Bearing Cyclometalated 1,2,3-Triazolylidene and Bi- or Terdentate 2,6-Diarylpyridine Ligands

Chemistry : a European Journal
Ángela VivancosPablo González-Herrero

Abstract

The synthesis, structure, and photophysical properties of luminescent PtIV complexes that combine cyclometalated 1,2,3-triazolylidene and bi- or terdentate 2,6-diarylpyridine ligands are reported. The targeted complexes represent the first examples of PtIV species with a cyclometalated mesoionic aryl-NHC ligand. They exhibit moderate or weak emissions in fluid solution at 298 K arising from 3 LC states, which become very intense in poly(methyl methacrylate) (PMMA) matrices at 298 K. DFT and TD-DFT calculations confirm that the chromophoric ligand is the cyclometalated 2,6-diarylpyridine and show that the aryl-NHC ligand exerts a beneficial effect on the emission efficiencies of these derivatives by increasing the energy of deactivating LMCT excited states with respect to comparable PtIV complexes with cyclometalated 2-arylpyridine ligands.

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Citations

Sep 19, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Ángela VivancosPablo González-Herrero
Jan 7, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Alexander D Ryabov
Sep 10, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Juan-Carlos López-LópezPablo González-Herrero

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