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Regioisomers of organic semiconducting dumbbell-shaped molecules: synthesis and structure-properties relationship

Abstract : Two new dumbbell-shaped molecules based on two solubilizing and structuring triazatruxene (TAT) units linked by a central chromophore were synthesized and studied. The central chromophore was an electro-deficient fluorene-malononitrile (FM) unit, that can be functionalized symmetrically on two different positions, giving rise to two positional isomers, called TAT-pFM and TAT-mFM, when the TATs are connected to the 2,7-and 3,6positions, respectively. The two isomers exhibited different electronic conjugation pathways that drastically affect their absorption properties and energy levels. Moreover, while TAT-pFM was organized in a stable 3D mesomorphic structure from room-temperature to the melting, TAT-mFM remained crystalline and decomposed before melting. Finally, despite a lower hole mobility, the TAT-mFM exhibited the highest Power Conversion Efficiency (PCE) of about 2% in organic solar cells. This higher PCE was attributed essentially to the pronounced internal charge transfer band contribution to the charge photogeneration observed in TAT-mFM solar cells.
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https://hal-cnrs.archives-ouvertes.fr/hal-03405458
Contributor : Nicolas Leclerc Connect in order to contact the contributor
Submitted on : Wednesday, October 27, 2021 - 11:45:58 AM
Last modification on : Tuesday, January 4, 2022 - 5:55:48 AM
Long-term archiving on: : Friday, January 28, 2022 - 6:48:28 PM

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Chaima Mahmoudi, Ibrahim Bulut, Jiang Jing, Sadiara Fall, Benoît Heinrich, et al.. Regioisomers of organic semiconducting dumbbell-shaped molecules: synthesis and structure-properties relationship. European Journal of Organic Chemistry, Wiley-VCH Verlag, 2021, 2021 (22), pp.3170-3177. ⟨hal-03405458⟩

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