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Halogenation of a twisted non-polar π-system as a tool to modulate phosphorescence at room temperature.
Farias, Giliandro; Salla, Cristian A M; Aydemir, Murat; Sturm, Ludmilla; Dechambenoit, Pierre; Durola, Fabien; de Souza, Bernardo; Bock, Harald; Monkman, Andrew P; Bechtold, Ivan H.
Afiliación
  • Farias G; Department of Chemistry, Universidade Federal de Santa Catarina 88040-900 Florianópolis SC Brazil bernadsz@gmail.com.
  • Salla CAM; Department of Physics, Universidade Federal de Santa Catarina 88040-900 Florianópolis SC Brazil ivan.bechtold@ufsc.br.
  • Aydemir M; Department of Physics, Durham University South Road Durham DH1 3LE UK ap.monkman@durham.ac.uk.
  • Sturm L; Erzurum Technical University, Department of Fundamental Sciences Erzurum Turkey.
  • Dechambenoit P; Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux 115, av. Schweitzer 33600 Pessac France harald.bock@crpp.cnrs.fr.
  • Durola F; Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux 115, av. Schweitzer 33600 Pessac France harald.bock@crpp.cnrs.fr.
  • de Souza B; Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux 115, av. Schweitzer 33600 Pessac France harald.bock@crpp.cnrs.fr.
  • Bock H; Department of Chemistry, Universidade Federal de Santa Catarina 88040-900 Florianópolis SC Brazil bernadsz@gmail.com.
  • Monkman AP; Centre de Recherche Paul Pascal, CNRS, Université de Bordeaux 115, av. Schweitzer 33600 Pessac France harald.bock@crpp.cnrs.fr.
  • Bechtold IH; Department of Physics, Durham University South Road Durham DH1 3LE UK ap.monkman@durham.ac.uk.
Chem Sci ; 12(45): 15116-15127, 2021 Nov 24.
Article en En | MEDLINE | ID: mdl-34909153
Halogenation of a twisted three-fold symmetric hydrocarbon with F, Cl or Br leads to strong modulation of triplet-triplet annihilation and dual phosphorescence, one thermally activated and the other very persistent and visible by eye, with different relative contributions depending on the halide. The room temperature phosphorescence is highly unusual given the absence of lone-pair-contributing heteroatoms. The interplay between the spin-orbit coupling matrix elements and the spatial configuration of the triplet state induces efficient intersystem crossing and thus room temperature phosphorescence even without relying on heteroatomic electron lone pairs. A ninefold increase of the ISC rate after introduction of three bromine atoms is accompanied by a much higher 34-fold increase of phosphorescence rate.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Chem Sci Año: 2021 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Chem Sci Año: 2021 Tipo del documento: Article Pais de publicación: Reino Unido