Chinese Journal of Chemistry最新文献_第10页

Hemilabile α-Diimine Nickel Catalyzed Olefin Polymerization 半不稳定α-二亚胺镍催化烯烃聚合

IF 5.5 1区化学

Chinese Journal of Chemistry Pub Date : 2024-12-10 DOI: 10.1002/cjoc.202400881

Muhammad Asadullah Khan, Yue Liu, Wenmin Pang, Ao Chen, Min Chen

{"title":"Hemilabile α-Diimine Nickel Catalyzed Olefin Polymerization","authors":"Muhammad Asadullah Khan, Yue Liu, Wenmin Pang, Ao Chen, Min Chen","doi":"10.1002/cjoc.202400881","DOIUrl":"https://doi.org/10.1002/cjoc.202400881","url":null,"abstract":"<div>\u0000 \u0000 For coordination-insertion olefin polymerization, the development of novel transition-metal catalysts has drawn extensive attention in this field. In this contribution, we designed a series of hemilabile α-diimine nickel catalysts bearing oxygen atom as neighboring group. The steric hindrance and oxygen atom number of these nickel complexes (Ni1—Ni4) could be adjusted, which influenced ethylene (co)polymerization processes. The introduction of oxygen atoms could enhance the thermal stability during ethylene polymerization for Ni2 compared to the counterpart without oxygen atoms. And for the copolymerization process of ethylene with polar monomers, higher catalytic activity (1.4 × 106 g·mol−1·h−1) and polar monomer incorporation ratio (1.2 mol%) were achieved. However, Ni4 with four oxygen atoms in this work was not active in ethylene polymerization due to the interaction between the oxygen atom and nickel catalytic center. The hemilabile effect in this work presented an example to enhance the stability of the α-diimine nickel catalysts in olefin polymerization.\u0000 \u0000 \u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"43 5","pages":"517-523"},"PeriodicalIF":5.5,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temperature- and Pressure-Dependent Emissions and Crystal- Glass Transition of a Hybrid Manganese Bromide† 杂化溴化锰†的温度和压力依赖性发射和晶体-玻璃化转变

IF 5.5 1区化学

Chinese Journal of Chemistry Pub Date : 2024-12-05 DOI: 10.1002/cjoc.202400945

Kai Li, Zi-Ying Li, Hui-Rong Dong, Yan Chen, Zhi-Gang Li, Yong-Qiang Chen, Rui Feng, Wei Li

{"title":"Temperature- and Pressure-Dependent Emissions and Crystal- Glass Transition of a Hybrid Manganese Bromide†","authors":"Kai Li, Zi-Ying Li, Hui-Rong Dong, Yan Chen, Zhi-Gang Li, Yong-Qiang Chen, Rui Feng, Wei Li","doi":"10.1002/cjoc.202400945","DOIUrl":"https://doi.org/10.1002/cjoc.202400945","url":null,"abstract":"<div>\u0000 \u0000 Herein, the temperature- and pressure-stimulated responsive behavior as well as crystal-glass phase transition of a new zero-dimensional hybrid manganese bromide [4-MTPP]2[MnBr4] [4-MTPP+ = (4-methoxybenzyl)tris(phenyl)phosphonium)] were reported. Our experiment results demonstrate that [4-MTPP]2[MnBr4] shows typical green photoluminescence emission centered at 522.4 nm excited by UV light, with a high photoluminescence quantum yields value of 79.36% and a large lifetime of 368.6 μs, attributing to its direct bandgap electronic structure. Further, the photoluminescence emission of [4-MTPP]2[MnBr4] presents a monotonically blue shift with the increased temperature, originating from the decreased crystal field strength where the Mn2+ stays owing to lattice thermal expansion effect. On the contrary, as the pressure increases, the photoluminescence emission of [4-MTPP]2[MnBr4] exhibits a progressive red shift, which can be attributed to the increased crystal field strength of Mn2+ due to the effect of pressure-induced lattice shrinkage. Meanwhile, its quenched emission can be successfully restored when the pressure returns to the ambient pressure. In addition, [4-MTPP]2[MnBr4] crystals show a crystal-glass phase transition at the temperature of 74 °C. Intriguingly, the melt-quenched glass of [4-MTPP]2[MnBr4] exhibits green emission under UV light excitation with a large lifetime of 302.2 μs.\u0000 \u0000 \u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"43 5","pages":"501-507"},"PeriodicalIF":5.5,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143112139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DABCO-Mediated Photoelectrochemical Three-Component Sulfonocyclization of 3-Aza-1,5-dienes dabco介导的3-叠氮-1,5-二烯三组分磺化反应

IF 5.5 1区化学

Chinese Journal of Chemistry Pub Date : 2024-12-02 DOI: 10.1002/cjoc.202401048

Lucai Ding, Guihong Yang, Li Luo, Yingchun Ma, Jifu Shi, Deqiang Liang, Yanni Li

{"title":"DABCO-Mediated Photoelectrochemical Three-Component Sulfonocyclization of 3-Aza-1,5-dienes","authors":"Lucai Ding, Guihong Yang, Li Luo, Yingchun Ma, Jifu Shi, Deqiang Liang, Yanni Li","doi":"10.1002/cjoc.202401048","DOIUrl":"https://doi.org/10.1002/cjoc.202401048","url":null,"abstract":"<div>\u0000 \u0000 Herein, we report a rare example of three-component net-oxidative sulfonylation of a SO2 surrogate with an oxidatively activated radical precursor under mild and metal- and external-oxidant-free conditions. The mildness and sustainability of the reaction are enabled by photoelectrocatalysis, and 3-aza-1,5-dienes, organotrifluoroborates and 1,4-diazabicyclo[2.2.2]octane bis(sulfur dioxide) adduct (DABSO) undergo sulfonylative cyclization to afford sulfono 4-pyrrolin-2-ones in an atom-economical manner with a broad substrate scope and good functional-group tolerance. The protocol is amenable to the late-stage diversification of complex molecular architectures as well as the gram-scale synthesis. Sunlight could be used as the light source, and the reaction could be conducted in an all-solar mode using a commercially available photovoltaic panel to generate electricity in situ. Mechanistic studies reveal that the in situ generated 1,4-diazabicyclo[2.2.2]octane (DABCO), which was generally innocent in previous reactions, functions as an electron shuttle between the photocatalytic cycle and the reactants.\u0000 \u0000 \u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"43 5","pages":"491-500"},"PeriodicalIF":5.5,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143110328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inside Cover Picture 内页图片

IF 5.5 1区化学

Chinese Journal of Chemistry Pub Date : 2024-12-01 DOI: 10.1002/cjoc.202590012

引用次数: 0

Novel Easy-to-Synthesize Hydrazine Multi-channel Detection and Adsorption Materials 易于合成的新型肼多通道检测和吸附材料

IF 5.5 1区化学

Chinese Journal of Chemistry Pub Date : 2024-11-26 DOI: 10.1002/cjoc.202400912

Juan Liu, Hou-Yi Zhao, Zi-Wen Liu, Peng-Yu Chen, Shao-Ping Tao, Lan Wu, Gui-Hua Li, Lu-Juan Cui, Qi Lin

{"title":"Novel Easy-to-Synthesize Hydrazine Multi-channel Detection and Adsorption Materials","authors":"Juan Liu, Hou-Yi Zhao, Zi-Wen Liu, Peng-Yu Chen, Shao-Ping Tao, Lan Wu, Gui-Hua Li, Lu-Juan Cui, Qi Lin","doi":"10.1002/cjoc.202400912","DOIUrl":"https://doi.org/10.1002/cjoc.202400912","url":null,"abstract":"<div>\u0000 \u0000 Hydrazine hydrate (DH) is a widely used chemical agent, but it is highly toxic. Thus, the development of low-cost and easy-to-prepare materials for the detection and adsorption of DH is very significant. Herein, a novel and easy-to-prepare supramolecular smart material based on bisquinoline-functionalized naphthalene diimide (DQ8) has been designed and synthesized. In the DQ8, the synergistic effect between quinoline and naphthalene diimide groups has been employed to improve the selectivity and sensitivity for binding of DH. The DQ8-based crystalline porous material (DQ8-CPM) can simultaneously detect and adsorb DH and produce noticeable fluorescence color changes after adsorption of DH vapor. More significantly, the DQ8-CPM shows nice recycling performance on DH detection and adsorption. Meanwhile, a smart gel based on DQ8 (DQ8-G) shows multi-channel response for DH through color, fluorescence, and state changes. The DQ8 shows high selectivity and sensitivity for DH. The detection limit of DQ8 for DH is 8.6 × 10–7 mol/L. According to the investigation of the DH binding and response mechanism, the synergistic effect between quinoline and naphthalene diimide groups plays an important role in the DH response process. It's a simple and feasible way to develop materials for detection and adsorption of DH through synergistic effects.\u0000 \u0000 \u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"43 4","pages":"408-416"},"PeriodicalIF":5.5,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Temperature-Driven Axial-Equatorial Isomerism and Magnetic Relaxation on Low-Spin Co(II) Borohydride Complexes 低自旋Co（II）硼氢化物配合物的温度驱动轴-赤道异构和磁弛豫

IF 5.5 1区化学

Chinese Journal of Chemistry Pub Date : 2024-11-25 DOI: 10.1002/cjoc.202400947

Jing-Yu Wang, Zhen Li, Lu Zhang, Yan-Cong Chen, Ze-Yu Ruan, Shan-Nan Du, Wei Deng, Si-Guo Wu, Jun-Liang Liu, Ming-Liang Tong

{"title":"Temperature-Driven Axial-Equatorial Isomerism and Magnetic Relaxation on Low-Spin Co(II) Borohydride Complexes","authors":"Jing-Yu Wang, Zhen Li, Lu Zhang, Yan-Cong Chen, Ze-Yu Ruan, Shan-Nan Du, Wei Deng, Si-Guo Wu, Jun-Liang Liu, Ming-Liang Tong","doi":"10.1002/cjoc.202400947","DOIUrl":"https://doi.org/10.1002/cjoc.202400947","url":null,"abstract":"<div>\u0000 \u0000 Crystalline materials with diastereomerism serve as ideal prototypes for investigating the influence of coordination environments on chemophysical properties. In this study, we synthesized a pair of axial-equatorial isomers [Co(II)(HB(timtBu)3)(cis-dppen)](BF4)·solv ([HB(timtBu)3]− = hydrotris(3-tertbutyl-2-thioxoimidazol-1-yl)borate; cis-dppen = cis-1,2-bis(diphenylphosphino)ethene; solv = 0.5THF·2H2O and 2H2O for ax-CoHS2P2 and eq-CoHS2P2, respectively), by varying the crystallization temperatures. Despite both diastereoisomers adopting distorted square pyramidal geometries, the bidentate cis-dppen ligand chelates to the central Co(II) either in an axial-equatorial or equatorial-equatorial manner, with a boron-hydrogen binding to the metal center. Magnetic studies reveal differences in g-values between these axial-equatorial isomers. X-band electron paramagnetic resonance spectra suggest rapid equilibrium and potential conformational interconversion in response to temperature changes in solution. Magnetic measurements indicate field-induced slow relaxation of magnetization in this low-spin S = 1/2 system, with spin-lattice relaxations dominated by Raman and quantum tunneling of magnetization mechanisms due to the absence of thermally populated excited states.\u0000 \u0000 \u0000 </div>","PeriodicalId":151,"journal":{"name":"Chinese Journal of Chemistry","volume":"43 4","pages":"423-430"},"PeriodicalIF":5.5,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143119362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Yb(OTf)3-Catalyzed Asymmetric [3+3] Cycloaddition of N-Vinyl Nitrones with Activated Cyclopropanes to Prepare 1,2-Oxazines Yb(OTf)3催化n -乙烯基硝基酮与活化环丙烷的不对称[3+3]环加成制1,2-恶嗪

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Chinese Journal of Chemistry Pub Date : 2024-11-25 DOI: 10.1002/cjoc.202400937

Yu-Zheng Wu, Yue Leng, Yi-Xin Chen, Shi-Qiu Huang, Ning Zou, Chun-Hua Chen, Dong-Liang Mo

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Visible Light-Induced Umpolung Synthesis of 3,3-Disubstituted Oxindoles via the Substrate-Photosensitive Strategy 基于衬底-光敏策略的可见光诱导Umpolung合成3,3-二取代吲哚

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Chinese Journal of Chemistry Pub Date : 2024-11-25 DOI: 10.1002/cjoc.202400973

Jingjing Yang, Tingting Wang, Benhui Sui, Hongyu Wang, Bo Tang

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Recent Advances of Terpenoids with Intriguing Chemical Skeletons and Biological Activities 具有有趣化学骨架和生物活性的萜类化合物的最新进展

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Chinese Journal of Chemistry Pub Date : 2024-11-21 DOI: 10.1002/cjoc.202400697

Yi Zang, Ruo-nan Sun, Ran-qi Feng, Hong-hui Zhu, Xu-wen Li

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Radical Functionalization of 1,6-Diene via Transannular Cyano Migration: Synthesis of Polysubstituted Cyclopentanes† 1,6-二烯跨环氰基迁移自由基功能化：多取代环戊烷的合成

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Chinese Journal of Chemistry Pub Date : 2024-11-21 DOI: 10.1002/cjoc.202401072

Ziqiang Wang, Yasu Chen, Chen Zhu

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