Orthogonal carbazole-perylene bisimide pentad: a photoconversion-tunable photosensitizer with diversified excitation and excited-state relaxation pathways
| العنوان: | Orthogonal carbazole-perylene bisimide pentad: a photoconversion-tunable photosensitizer with diversified excitation and excited-state relaxation pathways |
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| المؤلفون: | Zhaolong Wang, Yue Sun, Pi-Tai Chou, Yu Fang, Gang Wang, Gang He, Yu-Chen Wei, Taihong Liu, Xingmao Chang, Simin Lin, Shengye Jin, Xinyu Gou |
| المصدر: | Science China Chemistry. 64:2193-2202 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | chemistry.chemical_compound, Materials science, chemistry, Absorption spectroscopy, Carbazole, Excited state, Intramolecular force, Ultrafast laser spectroscopy, Photosensitizer, General Chemistry, Photochemistry, Luminescence, Perylene |
| الوصف: | Integrating multiple photosensitive properties into an “all-in-one” photosensitizer (PS) shows great promise for the treatment of cancers owing to synergistic effect among them. However, the development of such PSs, especially those that need a single laser source, remains a challenge. Herein, we report an orchestration of electron donors and acceptors in a propeller-like pentad, PBI-4Cz, where four carbazole (Cz) units are covalently linked to the ortho-positions of the perylene bisimide (PBI) core. Strong intramolecular donor-acceptor interaction significantly quenches the luminescence and largely extends the absorption spectra to near-infrared region. Excited-state dynamics investigated via femto- and nano-second transient absorption spectroscopy revealed exclusive charge separation of the PBI-4Cz within initial 0.5 ps when photoexcited regardless of which intermediate is involved. Energy dissipation of the resulting charge-separated state (PBI•−-4Cz•−) is subjected to the toggle between intersystem-crossing toward excited triplet states and charge recombination toward ground states. Relative importance of the two pathways can be tuned by micro-environmental polarity, which endows PBI-4Cz remarkable performances of singlet-oxygen generation (>90.0%) in toluene and photothermal conversion (∼28.6%) in DMSO. Harnessing intrinsic photostability and excited-state processes of heavy-atom-free PBI derivatives not only holds a promise for multifunctional phototheranostics, but also provides a prototype for designing high-performance PSs with tunable photoconversion pathways. |
| تدمد: | 1869-1870 1674-7291 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::5d0476e47c9253a2a7a741c5d5da7e43 https://doi.org/10.1007/s11426-021-1154-0 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........5d0476e47c9253a2a7a741c5d5da7e43 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 18691870 16747291 |
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