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| 1 | 显示文摘 | Lang Xianjun Ji Hongwei Chen Chuncheng | 2011 | Angew Chem Int Ed2011，50，： | 1 |
| 2 | Extending aromatic acids on TiO_(2)for cooperative photocatalysis with triethylamine:Violet light-induced selective aerobic oxidation of sulfides显示文摘Designing visible light photocatalysts with a metal oxide semiconductor as the starting material could expand a new horizon for the conversion and storage of solar energy.Here,the benchmark photocatalyst TiO_(2) was used to pursue this goal by anchoring aromatic acids.Extending the aromatic acid was strategically deployed to design TiO_(2) complexes with violet light-induced selective aerobic oxidation of sulfide as the probe reaction.With benzoic acid(BA)as the initial molecule,horizontally extending one or two benzene rings furnishes 2-naphthoic acid(2-NA)and 2-anthracene acid(2-AA).Moreover,triethylamine(TEA),an electron transfer mediator,was introduced to maintain the integrity of the anchored aromatic acids.Notably,there was a direct correlation between theπ-conjugation of aromatic acid ligand and the selective aerobic oxidation of sulfides.Among the three aromatic acids,2-AA delivered the best result over TiO_(2) due to the most extensiveπ-conjugated system.Ultimately,violet light-induced selective aerobic oxidation of sulfides into corresponding sulfoxides was conveniently realized by cooperative photocatalysis of 2-AA-TiO_(2) with 10 mol%of TEA.This work affords an extending strategy for designing the next-generation ligands for semiconductors to expand visible light-induced selective reactions. | Hui Li Xia Li Jun Zhou Wenlong Sheng Xianjun Lang | 2022 | Chinese Chemical Letters2022，33，8： | 0 |
| 3 | Merging benzotrithiophene covalent organic framework photocatalysis with TEMPO for selective oxidation of organic sulfides显示文摘Visible light photocatalysis of covalent organic frameworks(COFs) has made significant progress in recent years. Benzotrithiophene(BTT), a planar, electron-rich building block, turns out to be foundational in assembling COFs in which the fullπ-conjugation of BTT is essential to facilitate electron transfer. Herein, a sp~2 carbon-conjugated COF, namely BTT-sp~2c-COF, is assembled from benzo[1,2-b:3,4-b′:5,6-b′′]trithiophene-2,5,8-tricarbaldehyde and [1,1′:4′,1′′-terphenyl]-4,4′′-dicarbonitrile towards photocatalysis. More importantly, TEMPO(2,2,6,6-tetramethylpiperidin-1-yl)oxyl, 1 mol%) could considerably accelerate the selective oxidation of organic sulfides with O_(2) over BTT-sp~2c-COF. TEMPO mediates hole transfer between BTT-sp~2c-COF and organic sulfides, and O-atoms are incorporated into sulfoxides via an electron transfer pathway. Merging BTT-sp~2c-COF photocatalysis with TEMPO generally applies to transforming organic sulfides into sulfoxides. This work implies the full π-conjugation of electron-rich building blocks into COFs is a viable strategy for selective visible light photocatalysis. | Fengwei Huang Yuexin Wang Xiaoyun Dong Xianjun Lang | 2023 | Science China Chemistry2023，66，11： | 0 |
| 4 | Red light-driven generation of reactive oxygen species for the targeted oxidation of glioma cells and thiols over covalent organic framework显示文摘Reactive oxygen species(RoS)are essential for biological processes like cell signaling and chemical processes like organic oxidation.Moreover,the sufficient generation of RoS plays a significant role in targeted tumor treatments or oxidation of organics.Herein,a hydrazone-linked porphyrin covalent organic framework(Por-DETH-COF)is developed for red light-induced generation of ROS like singlet oxygen(^(1)O_(2))or superoxide(O_(2)·^(-))to undertake different but targeted oxidations.First,^(1)O_(2)is adopted in photodynamic therapy(PDT)for the oxidation of glioma cells.The PDT efficiency of Por-DETH-COF on the apoptosis of glioma cells is explored through flow cytometry and western blot assay.The apoptosis rate of glioma cells significantly increases over Por-DETH-COF under 660nm red light illumination,suggestive of the potency of^(1)O_(2).Second,O_(2)^(·-)is employed for the targeted oxidation of thiols.A series of thiols could be efficiently oxidized to corresponding disulfides over Por-DETH-COF under 660 nm red light illumination,indicative of the significance of O_(2)^(·-).This work highlights the potential of covalent organic frameworks in generating Ros for precise medical applications of complex chemical environments. | Heng Wei Xia Li Fengwei Huang Shujuan Wu Huimin Ding Qianxue Chen Mingchang Li Xianjun Lang | 2023 | Chinese Chemical Letters2023，34，12： | 0 |
| 5 | TEMPO visible light photocatalysis: The selective aerobic oxidation of thiols to disulfides显示文摘TEMPO(2,2,6,6-tetramethylpipe ridine-1-oxyl)is well-established in orangocatalysis that usually work in synergy with transition-metal catalysis or semiconductor photocatalysis.Here,TEMPO was turned into a visible light photocatalyst to conduct the selective aerobic oxidation of thiols into disulfides.With O2 as an oxidant,a mild and efficient protocol for the selective oxidation of thiols into disulfides including symmetrical and unsymmetrical ones with 5 mol%of TEPMO as a photocatalyst was developed at room temperature under the irradiation of 460 nm blue LEDs.It was found that a complex formed between TEMPO and thiols underpinned the visible light activity and disulfides were obtained in very high isolated yields.This work suggests that TEMPO takes diverse roles in for photocatalytic selective oxidative transformations with O2 as the oxidant. | Hui Xu Yu-Fei Zhang Xianjun Lang | 2020 | Chinese Chemical Letters2020，31，6： | 0 |
| 6 | Classification and antioxidant assays of polyphenols:a review显示文摘Polyphenols are widely recognized as the effective antioxidants,which are divided into flavonoids,phenolic acids,stilbenes,lignans,tannins and so on.They could regulate internal functions and protect the body from diseases related to oxidative damage.Due to the fact that their antioxidant capacity is influenced by the structure,stability and bioavailability,the detection of their bioactivity should be considered comprehensively.Currently,the methods for measuring the antioxidant capacity of phenolic compounds are divided into chemical,cell-based and in vivo assays.The chemical assays include 2,2-diphenyl-l-picrylhydrazyl(DPPHI),2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)(ABTS),ferric reducing/antioxidant power(FRAP),oxygen radical absorbance capacity(ORAC),peroxyI radical scavenging capacity(PSC),which are rapid identification method,but their reaction mechanism has a great gap with the internal body response.The cell-based assays are more consistent with biological reaction,but still do not take the bioavailability into consideration.The in vivo assays,which commonly utilized Caenorhabditis elegans or rats as models,are more representative,but these methods are more complex and spend longer.This review summarizes the antioxidant evaluation methods of phenolic compounds and discusses their advantages and limitations comparatively,which could help discriminate and select the appropriate assay in the actual operation,and facilitate the development of comprehensive approaches as well. | Yuxi Lang Ningxuan Gao Zhihuan Zang Xianjun Meng Yang Lin Shufang Yang Yiyun Yang Zhufeng Jin Bin Li | 2024 | Journal of Future Foods2024，4，3： | 0 |
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