Publication: Stereoselective Formation of Facial Tris-Cyclometalated PtIV Complexes: Dual Phosphorescence from Heteroleptic Derivatives
Authors
López-López, Juan Carlos ; Bautista, Delia ; González Herrero, Pablo
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Publisher
Wiley
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DOI
https://doi.org/10.1002/chem.202001164
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info:eu-repo/semantics/article
Description
Abstract
A stereoselective synthetic route to homo- and heteroleptic facial tris-cyclometalated PtIV complexes is reported, involving the oxidative addition of 2-(2-pyridyl)- or 2-(1-isoquinolinyl)benzenediazonium salts to cis-[Pt(C^N)2] 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 N2. 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 (3LC) 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 PtIV complexes as multi-emissive materials.
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Citation
Chemistry, A European Journal 2020, 26, 11307-11315.
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