Homoleptic tris-cyclometalated platinum( iv ) complexes: a new class of long-lived, highly efficient 3 LC emitters

The synthesis of meridional and facial isomers of tris-cyclometalated Pt( iv ) complexes, [Pt(C^N) 3 ]OTf, where C^N is a C-deprotonated 2-phenylpyridine-based ligand or 1-phenylpyrazole, is reported for the first time. The facial isomers exhibit high-energy emissions from essentially 3 LC excited s...

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Published inChemical science (Cambridge) Vol. 5; no. 5; pp. 1875 - 1880
Main Authors Juliá, Fabio, Bautista, Delia, Fernández-Hernández, Jesús M., González-Herrero, Pablo
Format Journal Article
LanguageEnglish
Published 2014
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Summary:The synthesis of meridional and facial isomers of tris-cyclometalated Pt( iv ) complexes, [Pt(C^N) 3 ]OTf, where C^N is a C-deprotonated 2-phenylpyridine-based ligand or 1-phenylpyrazole, is reported for the first time. The facial isomers exhibit high-energy emissions from essentially 3 LC excited states, characterized by lifetimes of hundreds of microseconds and quantum yields up to 0.49 at room temperature in fluid solution, the highest ever found for Pt( iv ) complexes. Stern–Volmer studies demonstrate the high sensitivity of the facial isomers toward oxygen and their electrochemical characterization reveals large redox gaps and a strong oxidizing character in the excited state.
ISSN:2041-6520
2041-6539
DOI:10.1039/C3SC53187B