Persistent Solid‐State Phosphorescence and Delayed Fluorescence at Room Temperature by a Twisted Hydrocarbon |
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Authors: | Cristian A M Salla Giliandro Farias Mathieu Rouzires Pierre Dechambenoit Fabien Durola Harald Bock Bernardo deSouza Ivan H Bechtold |
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Institution: | Cristian A. M. Salla,Giliandro Farias,Mathieu Rouzières,Pierre Dechambenoit,Fabien Durola,Harald Bock,Bernardo de Souza,Ivan H. Bechtold |
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Abstract: | The dehydrating cyclotrimerization of 1‐tetralone in the presence of titanium tetrachloride at high temperatures leads to homotruxene, a nonplanar arene in which the twist angles between its three outer benzene rings and the central benzene are stabilized by ethylene bridges. This non‐planar configuration allows for pronounced spin–orbit coupling and a high triplet energy, leading to room‐temperature phosphorescence in air with a lifetime of 0.38 s and a quantum yield of 5.6 %, clearly visible to the human eye after switching off the excitation. Triplet–triplet annihilation is found to simultaneously lead to a substantial delayed fluorescence, unprecedented from a pure hydrocarbon at ambient conditions, with a lifetime of 0.11 s. |
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Keywords: | Cyclotrimerisierung Raumtemperatur-Phosphoreszenz Spin-Bahn-Kopplung Triplett-Triplett-Auslö schung Verzö gerte Fluoreszenz |
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