Article
Chemistry, Multidisciplinary
Shi-Yu Chen, Ru-Chao Pan, Min Chen, Ye Liu, Changle Chen, Xiao-Bing Lu
Summary: Nonalternating copolymerization of olefin with carbon monoxide shows promise in improving processability and thermal stability of polyketones. The use of palladium coordinated diphosphazane monoxide with strong electron-donating groups enhances reactivity and ethylene incorporation, leading to lower melting temperatures and improved properties of the resulting materials. This study demonstrates the potential of cationic palladium complexes in achieving high reactivity and nonalternating degree in copolymerization reactions.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Polymer Science
Maoji Zhao, Shuaishuai Zhu, Guochao Zhang, Yong Wang, Yonggui Liao, Jing Xu, Xingping Zhou, Xiaolin Xie
Summary: CO2-based block copolymers as high-value-added and functional materials have gained significant attention. This study demonstrates the three-component polymerization of propylene oxide, phthalic anhydride, and CO2 using commercial Lewis pairs as catalysts, leading to the synthesis of linear and hyperbranched poly(propylene phthalate)-b-poly(propylene carbonate). Controlling the Et3B/chain transfer agent (CTA) ratio allows for the suppression of cyclic byproduct formation. The influence of topology on the properties of the copolymers is also investigated.
Article
Chemistry, Multidisciplinary
Fei Li, Yicong Luo, Jinbao Ren, Qianjia Yuan, Deyue Yan, Wanbin Zhang
Summary: An iridium-catalyzed remote site-switchable hydroarylation of alkenes was reported, delivering functionalized products with good selectivities. The reaction showed excellent tolerance towards different functional groups and a wide substrate scope. Moreover, it successfully achieved the regioconvergent transformation of mixtures of isomeric alkenes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Chujing Yang, Zhiwei Zhang, Jingqi Chen, Xinying Zhang, Yankai Dai, Xuyi Li, Yingying Chen, Jiaqiang Xu, Lingyan Feng
Summary: We discovered that the complexes formed by nucleotides and terbium(iii) exhibit circularly polarized luminescence (CPL). The CPL of GMP/Tb/Ag coordination polymer nanoparticles (CPNs) can be manipulated by a magnetic field and pH. The CPL of purine nucleobases is opposite to that of pyrimidine nucleobases. GMP/Tb/Ag CPNs can be used as advanced safety coatings and acid-base switches, while Tb/Ag can serve as CPL probes for rapid differentiation of nucleotides, providing insights into the multiple transformations and applications of CPL.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Yuezhou Huang, Chenyang Hu, Xuan Pang, Yanchuan Zhou, Ranlong Duan, Zhiqiang Sun, Xuesi Chen
Summary: This paper presents an electrochemically switchable strategy for copolymerization using heterometallic complexes, allowing control over the composition and properties of multi-block copolymers. The strategy enables the synthesis of polymers with different functionalities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Yota Sakakibara, Kei Murakami
Summary: The development of photocatalysts has provided a new approach to control reaction intermediates and product selectivity, attracting considerable attention in the fields of organic and medicinal chemistry in recent years.
Article
Polymer Science
Yukiko Enomoto, Tadahisa Iwata
Summary: In this study, bio-based aromatic polyketones (PKs) and polyetherketones (PEKs) were synthesized using electrophilic substitution reaction. The introduction of alkoxy side-chains at the hydroxyl groups of divanillic acid prior to polymerization allowed for the successful synthesis of soluble polymers with determined chemical structures. The PKs exhibited high glass transition temperatures (T-g) and thermal stability compared to the PEKs, highlighting the importance of side-chain structures in determining properties of these materials.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Engineering, Environmental
Lie Liu, Huachun Lan, Yuqi Cui, Xiaoqiang An, Meng Sun, Huijuan Liu, Jiuhui Qu
Summary: A polypyrrole-based active membrane with a switchable multi-affinity was created for simultaneous separation of small ionic and organic contaminants from water. The membrane exhibited high filtration efficiency, permeability, and the ability for membrane regeneration and self-cleaning through reversible potential switching.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Tereza Korabkova, Jan Bartacek, Lukas Marek, Jiri Hanusek, Ales Ruzicka, Jiri Vana
Summary: In this work, the possibility of switching the regioselectivity of C-H activation reactions by adding acids of different strengths was studied. The addition of no or weak acids causes the reaction to be controlled by a stronger directing group, while the addition of a strong acid leads to control by a weaker directing group. This approach enables the synthesis of non-symmetrical [2.2]-dipalladaparacyclophanes.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Environmental
Lie Liu, Huachun Lan, Yuqi Cui, Xiaoqiang An, Meng Sun, Huijuan Liu, Jiuhui Qu
Summary: In this study, a polypyrrole-based active membrane with switchable multi-affinity was created for simultaneous separation of small ionic and organic contaminants from water. The designed smart membrane showed high permeability, good single-pass filtration efficiency, and the ability to regenerate and self-clean by applying a reversible potential.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yuyang Dong, Michael Lipschutz, Ryan J. Witzke, Julien A. Panetier, T. Don Tilley
Summary: The study introduced a low-coordinate monovalent cobalt complex supported by bulky amide and N-heterocyclic carbene (NHC) ligands, along with its 9-diazofluorene adduct. The complex possesses a high-spin divalent cobalt center antiferromagnetically coupled to a ligand-based radical, resulting in a triplet spin ground state. The catalyst precursors demonstrated different product selectivity in benzene and THF, with a mechanistic study to explain the observed results.
Article
Biochemistry & Molecular Biology
Xiao-Yu Miao, Yong-Ji Hu, Fu-Rao Liu, Yuan-Yuan Sun, Die Sun, An-Xin Wu, Yan-Ping Zhu
Summary: A cascade 6-endo-dig cyclization reaction has been developed for the switchable synthesis of halogen and non-halogen-functionalized pyrazolo[3,4-b]pyridines. This reaction demonstrated wide substrate scope, good functional group tolerance, and excellent regional selectivity.
Article
Chemistry, Multidisciplinary
Narito Ozawa, Kilingaru Shivakumar, Muthuchamy Murugavel, Yuya Inaba, Tomoki Yoneda, Yuki Ide, Jenny Pirillo, Yuh Hijikata, Yasuhide Inokuma
Summary: Cyclic oligoketones composed of 3,3-dimethylpentane-2,4-diones exhibit crown ether-like alkali metal ion binding behavior and can be utilized for catalysis in the Finkelstein reaction. Additionally, novel ion-binding hosts can be generated by terminal functionalization of linear polyketones.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Ming Zhou, Jiangyu Huang, Yanfeng Zhao, Xinyi Deng, Ruifeng Ni, Yaxiong Zhao, Yinglan He
Summary: CO2/N2 switchable Gemini surfactants have excellent reversibility and reproducibility, reducing carbon emissions and promoting carbon neutralization.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Electrochemistry
Ilya I. Ryzhkov, Margarita A. Shchurkina, Elena Mikhlina, Mikhail M. Simunin, Ivan Nemtsev
Summary: Nanoporous membranes with electrically conductive surface are an important class of stimuli-responsive materials. The variation of surface potential allows for adjusting ionic selectivity, conductivity, and rejection. This work focuses on the theoretical and experimental study of switchable ionic selectivity, providing insights into ion transport in stimuli-responsive membranes operated by electric field.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Shipeng Yue, Jianping Qu, Guoliang Li, Shichao Liu, Zhongkai Guo, Jinchuan Jie, Yubo Zhang, Tingju Li
Summary: This study investigated the microstructure evolution and mechanical properties of Cu-3Ag-xZr alloys processed by equal channel angular pressing at room temperature. The results showed that significant grain refinement and excellent comprehensive properties were achieved, which could provide a feasible way for the preparation of high-performance alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
J. P. Qu, S. P. Yue, W. S. Zhang, B. W. Dong, Y. J. Wang, J. C. Jie, T. M. Wang, T. J. Li
Summary: The study investigated the impact of Si content on the microstructure evolution and properties of CuCr0.8Zr0.12Six alloys through thermodynamic analysis and first-principles calculation, revealing a direct relationship between the Si content, mechanical properties, and the formation of Cr3Si. Experimentally, it was found that CuCr0.8Zr0.12Si0.05 exhibited the highest comprehensive properties with increased tensile strength, elongation, electrical conductivity, and hardness compared to other Si content levels within the range of 0 to 0.2 wt%.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Shipeng Yue, Guoliang Li, Jianping Qu, Shichao Liu, Zhongkai Guo, Jinchuan Jie, Shengli Guo, Tingju Li
Summary: In this work, cold drawing deformation was used to improve the strength and electrical conductivity of Cu-20Fe alloy. The microstructure evolution and strengthening mechanisms, as well as the variation in conductivity were investigated. It was found that both Cu matrix grains and Fe-rich dendrites could be refined and transformed into fibrous structure with increasing drawing strain. The resulting alloy exhibited a yield strength of 1173 MPa and an electrical conductivity of 41 %IACS.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Organic
Si-Da Wang, Bo Yang, Hao Zhang, Jian-Ping Qu, Yan-Biao Kang
Summary: In this study, a variety of (hetero)aryl chlorides, bromides, and iodides were reduced to corresponding (hetero)arenes under the irradiation of 407 nm LEDs using sodium formate as reductant and thiol as hydrogen atom transfer agent. The key intermediates, aryl radicals, could be trapped by either hydrogen, phosphite, or borates. The same reduction conditions can also be used for the deprotection of sulfonamides.
Article
Chemistry, Physical
Wenshu Zhang, Xin Jin, Jianping Qu, Siyang Liu, Fangyuan Hu, Xudong Wang, Hao Huang, Man Yao
Summary: Heterostructures composed of transition-metal dichalcogenides and MXene exhibit excellent performance as Na-ion batteries anodes. MoSe2/MXene is shown to have better electrochemical performance than MoS2/MXene. However, MoSeS/MXene performs poorly in overall performance tests.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Mechanical
Bowen Dong, Gaoyu Peng, Zhenpeng Wu, Xingrun Shan, Chengjun Guo, Junwei Miao, Jianping Qu, Wenyan Luo, Jinchuan Jie, Tingju Li
Summary: By studying the Cu-14.7Ni-3.1Al (wt.%) alloys, it was found that with the decrease of aging temperature from 973 K to 773 K, the size of (Ni, Cu)3Al precipitates (L12) in the Cu-rich solid solution (FCC) decreased. The simultaneous increase of tensile strength (from 563 MPa to 729 MPa) and ductility (from 5.4% to 13.5%) was observed. A CALPHAD-MD coupled method was proposed to quantitatively reveal the relationship between microstructures and mechanical properties of the precipitation-strengthening Cu-Ni-Al alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Organic
Yong-Ze Chen, Ting-Hui Ding, Qiang-Qiang Li, Jian-Ping Qu, Yan-Biao Kang
Summary: A direct dehydrogenative C-H cleaving carbonylative lactamization of 2-arylanilines promoted by visible light and potassium bases is reported. Solvent DMF acts as the sole carbonyl source in the absence of an oxidant. The irreversible release of hydrogen gas drags this reaction to the stable phenanthridinone products. This method provides a direct conversion of a broad range of 2-arylanilines to various phenanthridinones, which could be applied in the synthesis of bioactive molecules and organic optoelectronic materials.
Article
Chemistry, Organic
Xian-Peng Cai, Bin-Hong Han, Fu-Tong Cen, Jian-Ping Qu, Yan-Biao Kang
Summary: CBZ6 is a redox-neutral non-donor-acceptor-type organo-photocatalyst with a strong reductive potential (-2.16 V vs SCE). It can function as a photosensitizer for both single-electron transfer and triplet energy transfer processes, allowing for site-selective control in the intramolecular hydroarylation of acrylamides. This process provides a concise and environmentally sustainable access to a series of oxindoles and dihydroquinolinones without the use of transition metals, halogen-containing reagents, or additional reductants or oxidants.
Article
Chemistry, Organic
Guo-Qing Jiang, Bin-Hong Han, Xian-Peng Cai, Jian-Ping Qu, Yan-Biao Kang
Summary: An iron-catalyzed direct aerobic alpha,beta-dehydrogenation of carbonyls has been reported using tert-butyl nitrite and N-hydroxyphthalimide as the co-catalyst system. This method allows for the production of a wide range of lactams, flavanones, lactone, and thiochromen-4-one in high yields without the need for extra transition metal reagents.
Article
Biochemistry & Molecular Biology
Jian-Yu Wang, Qiu-Yue Li, Li Ren, Cheng Guo, Jian-Ping Qu, Zheng Gao, Hui-Fang Wang, Qian Zhang, Bo Zhou
Summary: Octanoic acid is a nematicide that affects the energy metabolism, lifespan, and signaling of Meloidogyne incognita. It primarily targets the cuticle, lysosomes, and extracellular regions of the nematodes. Nematodes can tolerate low concentrations of octanoic acid by up-regulating defense enzymes and alternative metabolic pathways.
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
(2023)
Article
Chemistry, Organic
Bin-Hong Han, Yu Sun, Xian-Peng Cai, Jian-Ping Qu, Yan-Biao Kang
Summary: Salicylaldehyde is found to be an efficient photocatalyst for the intermolecular transalkylation of phthalimide in this study. The well-designed dimethyl N-hydroxyphthalimide ester serves as a good alkylation reagent, inhibiting the competing intramolecular alkylation of the alkylating reagent and enabling the site-specific synthesis of N-substituted phthalimide.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Yong-Ze Chen, Yi-Ming Chen, Yuan Hu, Jian-Ping Qu, Yan-Biao Kang
Summary: This study reports a tandem transalkylation-cyclization reaction catalyzed by the super organoreductant CBZ6, using amines as traceless radical donors and stabilizers. The breaking of an N-C bond in the later stage allows transalkylation with a secondary amine as the leaving group. Various tertiary amines were successfully employed as alkyl radical donors. Additionally, the use of this traceless stabilizer enables transalkylation with methyl radical, which is typically unstable and difficult to use.
Article
Chemistry, Organic
Xian-Chao Cui, Hu Zhang, Hao Zhang, Yi-Ping Wang, Jian-Ping Qu, Yan-Biao Kang
Summary: A method for synthesizing a-hydroxyl and a-amino pyridinyl esters via photoreductive dual radical cross-coupling catalyzed by the super-organoreductant CBZ6 has been developed. Wide range of 2-pyridinylation and 4-pyridinylation reactions of either a-ketoesters or imine derivatives have been achieved. Applications in the synthesis of pyridinyl amino-hydroxyl acids as well as a new chiral oxazoline ligand have also been accomplished.
Article
Chemistry, Organic
Yong-Ze Chen, Ting-Hui Ding, Qiang-Qiang Li, Jian-Ping Qu, Yan-Biao Kang
Summary: This study reports the direct dehydrogenative C-H cleaving carbonylative lactamization of 2-arylanilines promoted by visible light and potassium bases. The solvent DMF serves as the sole carbonyl source without the need for an oxidant. The irreversible release of hydrogen gas leads to the formation of stable phenanthridinone products. This method provides a direct conversion of a wide range of 2-arylanilines into various phenanthridinones, making it useful for the synthesis of bioactive molecules and organic optoelectronic materials.
Article
Chemistry, Multidisciplinary
Xian-Chao Cui, Hu Zhang, Yi-Ping Wang, Jian-Ping Qu, Yan-Biao Kang
Summary: In this study, we report a new photocatalytic method for the 2- or 4-pyridylation of compounds containing O, N, or S groups, using the organic photoreductant CBZ6 and sulfoxides or sulfides as HAT reagents. This is the first base-free version of the alpha-C-H 2-/4-pyridylation of compounds containing ethers, amines, or thioethers.
