Photoactive Boron-Nitrogen-Carbon Hybrids From Azo-borazines to Polymeric Materials

Hamid Oubaha 1, 2 Nicola Demitri 3 Joelle Rault-Berthelot 4 Philippe Dubois 1 O. Coulembier 1 Davide Bonifazi 5, 2
1 UMONS - University of Mons [Belgium]
2 Université de Namur [Namur]
3 Elettra Sincrotrone Trieste
4 ISCR - Institut des Sciences Chimiques de Rennes
5 Cardiff University
Abstract : In this paper, we describe synthetic routes for preparing a novel switchable BNC-based chromophore, composed of a borazine core peripherally functionalized with azobenzene moieties. Capitalizing on the Pd-catalyzed Suzuki cross-coupling reaction between a tris-triflate borazine and an organoboron azobenzene derivative, a photoswtichable azo-borazine derivative was successfully prepared. The molecule showed reversible E/Z photoisomerization upon irradiation at the maximum of the intense pi-pi* absorption feature (360 nm). X-ray crystallographic investigations revealed a nonplanar orientation of the three azobenzene moieties and the trans configuration of the -N=N- bonds. Building on the synthetic versatility of the borazine-azobenzene derivative, we used this photoactive scaffold to engineer soluble BN-doped polythiophene polymers. Photophysical characterization performed in solvents of different polarity suggested that the polymer undergoes intramolecular charge transfer (ICT).
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Journal articles
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-02278423
Contributor : Laurent Jonchère <>
Submitted on : Wednesday, September 4, 2019 - 1:18:49 PM
Last modification on : Friday, September 6, 2019 - 3:28:02 PM

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UNIV-RENNES1 | ISCR | UR1-UFR-SPM | INC-CNRS | UNIV-RENNES | INSA-GROUPE

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Hamid Oubaha, Nicola Demitri, Joelle Rault-Berthelot, Philippe Dubois, O. Coulembier, et al.. Photoactive Boron-Nitrogen-Carbon Hybrids From Azo-borazines to Polymeric Materials. Journal of Organic Chemistry, American Chemical Society, 2019, 84 (14), pp.9101-9116. ⟨10.1021/acs.joc.9b01046⟩. ⟨hal-02278423⟩

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