- Direct C-H functionalization of difluoroboron dipyrromethenes (BODIPYs) at β-position by iodonium salts
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A copper-catalyzed direct C-H arylation or vinylation of BODIPYs at the β-position by iodonium salts has been developed, which provides facile access to a variety of mono-substituted BODIPY dyes. Interestingly, β-styryl BODIPY compound 9b exhibits apparent cytotoxicity after laser irradiation, which has great potential for photodynamic therapy.
- Ren, Wenming,Xiang, Huaijiang,Peng, Chengyuan,Musha, Zulipali,Chen, Jingjing,Li, Xin,Huang, Ruimin,Hu, Youhong
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- Intramolecular RET enhanced visible light-absorbing bodipy organic triplet photosensitizers and application in photooxidation and triplet-triplet annihilation upconversion
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Resonance energy transfer (RET) was used for the first time to enhance the visible light absorption of triplet photosensitizers. The intramolecular energy donor (boron-dipyrromethene, Bodipy) and acceptor (iodo-Bodipy) show different absorption bands in v
- Zhang, Caishun,Zhao, Jianzhang,Wu, Shuo,Wang, Zilong,Wu, Wanhua,Ma, Jie,Guo, Song,Huang, Ling
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p. 10566 - 10578
(2013/08/23)
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- Energy-funneling-based broadband visible-light-absorbing Bodipy-C 60 triads and tetrads as dual functional heavy-atom-free organic triplet photosensitizers for photocatalytic organic reactions
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C60-bodipy triads and tetrads based on the energy-funneling effect that show broadband absorption in the visible region have been prepared as novel triplet photosensitizers. The new photosensitizers contain two or three different light-harvesting antennae associated with different absorption wavelengths, resulting in a broad absorption band (450-650 nm). The panchromatic excitation energy harvested by the bodipy moieties is funneled into a spin converter (C60), thus ensuring intersystem crossing and population of the triplet state. Nanosecond time-resolved transient absorption and spin density analysis indicated that the T1 state is localized on either C60 or the antennae, depending on the T1 energy levels of the two entities. The antenna-localized T1 state shows a longer lifetime (τT=132.9 μs) than the C60-localized T1 state (ca. 27.4 μs). We found that the C60 triads and tetrads can be used as dual functional photocatalysts, that is, singlet oxygen (1O2) and superoxide radical anion (O 2.-) photosensitizers. In the photooxidation of naphthol to juglone, the 1O2 photosensitizing ability of the C60 triad is a factor of 8.9 greater than the conventional triplet photosensitizers tetraphenylporphyrin and methylene blue. The C 60 dyads and triads were also used as photocatalysts for O 2.--mediated aerobic oxidation of aromatic boronic acids to produce phenols. The reaction times were greatly reduced compared with when [Ru(bpy)3Cl2] was used as photocatalyst. Our study of triplet photosensitizers has shown that broadband absorption in the visible spectral region and long-lived triplet excited states can be useful for the design of new heavy-atom-free organic triplet photosensitizers and for the application of these triplet photosensitizers in photo-organocatalysis. Fullerene photocatalysts: Broadband visible-light- absorbing, heavy-atom-free triplet photosensitizers based on bodipy-C 60 dyads, triads, and tetrads have been prepared (see figure). Resonance energy transfer or intramolecular funneling was used to achieve panchromatic absorption in the visible region. The triplet photosensitizers were used as dual functional photo-organocatalysts to produce 1O 2 or O2.-. The 1O 2 sensitizing ability of the new photosensitizers is up to a factor of 8.9 greater than other known triplet photosensitizers based on a monochromophore such as methylene blue.
- Huang, Ling,Cui, Xiaoneng,Therrien, Bruno,Zhao, Jianzhang
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supporting information
p. 17472 - 17482
(2014/01/06)
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- Synthesis and spectroscopic properties of bodipy dimers with effective solid-state emission
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Boron-dipyrromethenes (BODIPYs) dimers with phenyl and bulky triphenylsilylphenyl substituents were synthesized through oxidative self-coupling of the 2-position with FeCl3. Spectroscopic properties of all the dyes in various solvents and on fi
- Gai, Lizhi,Lu, Hua,Zou, Bin,Lai, Guoqiao,Shen, Zhen,Li, Zhifang
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p. 8840 - 8846
(2015/02/19)
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