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Porphyrin-Sensitizers and Anthracene-Annihilators Built in Isostructural Frameworks for Investigating Triplet-Triplet Annihilation Upconversion.

Naifang LiuHailong ChenJie SuYuxiang WengJagadese J VittalSheng-Li HuangJianzhuang Jiang
Published in: Inorganic chemistry (2024)
In this study, four isostructural pillar-layered frameworks were constructed using a porphyrin layer and an anthracene pillar, which served as the sensitizer and annihilator, respectively, in the triplet-triplet annihilation upconversion (TTA-UC) system. Framework 1 demonstrated the highest upconversion quantum yield of 1.01%. Additionally, 1 and 2 also exhibited down-conversion fluorescence resulting from the porphyrin component. A twist intramolecular charge transfer (TICT) state was observed in the bianthracene chromophore of 2 , resulting in transient rotation of two anthracene rings and red-shifted emission. Both computational studies and experiments confirmed the transition from a locally excited state to a TICT state upon the inclusion of polar guest molecules into the framework.
Keyphrases
  • energy transfer
  • quantum dots
  • photodynamic therapy
  • wastewater treatment
  • molecular dynamics
  • highly efficient
  • water soluble
  • solid state