AI Article Synopsis
- A new method is presented for creating facial tris-cyclometalated platinum complexes, which involves using specific diazonium salts to react with platinum precursors.
- This technique allows for the development of compounds with cyclometalated ligands that have low energy transitions, enabling them to exhibit phosphorescence at room temperature.
- The study also reveals that heteroleptic derivatives have unique fluorescence and dual phosphorescence properties, showcasing their potential for use as materials with multiple emissions.
Article Abstract
A stereoselective synthetic route to homo- and heteroleptic facial tris-cyclometalated Pt complexes is reported, involving the oxidative addition of 2-(2-pyridyl)- or 2-(1-isoquinolinyl)benzenediazonium salts to cis-[Pt(C^N) ] precursors, with C^N=cyclometalated 2-(p-tolyl)pyridine (tpy), 2-phenylquinoline (pq), 2-(2-thienyl)pyridine or 1-phenylisoquinoline (piq), to produce labile diazenide intermediates that undergo photochemical or thermal elimination of N . The method allows the preparation of derivatives bearing cyclometalated ligands of low π-π* transition energies. The new complexes exhibit phosphorescence in fluid solution at room temperature arising from triplet ligand-centered ( LC) excited states, which, in the cases of the heteroleptic derivatives, involve the ligand with the lowest π-π* gap. The heteroleptic piq derivatives exhibit fluorescence and dual phosphorescence from different ligand-centered excited states in rigid media, demonstrating the potential of cyclometalated Pt complexes as multi-emissive materials.
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| http://dx.doi.org/10.1002/chem.202001164 | DOI Listing |
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