检索结果-南通市图书馆

Aggregation-Induced Synthesis (AIS): Asymmetric Synthesis via Chiral Aggregates

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2022年第4期2022卷 731-739页

作者： Hossein Rouh Yao Tang Ting Xu Qingkai Yuan Sai Zhang Jia-Yin Wang shengzhou jin Yu Wang Junyi Pan Hannah LWood James D.McDonald Guigen Li Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTexas 79409-1061USA Institute of Chemistry and BioMedical Sciences School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China

A new chiral aggregate-based tool for asymmetric synthesis has been developed by taking advantage of chiral aggregates of GAP(Group-Assisted Purification)reagents,N-phosphonyl imines.This tool was proven to be successful in the asymmetric GAP synthesis of functionalized 2,3-dihydrobenzofurans by reacting salicyl N-phosphonyl imines with dialkyl bromomalonates in various cosolvent systems.The chiral induction can be controlled by differentiating between two asymmetric directions simply by changing the ratios of cosolvents which are commonly adopted in AIE(aggregation-induced emission)systems.The formation of chiral aggregates was witnessed by a new analytical tool-aggregation-induced polarization(AIP).The present synthetic method will be broadly extended for general organic synthesis,particularly,for asymmetric synthesis and asymmetric catalysis in the future.

关键词： asymmetric chiral synthesis

Multilayer 3D Chiral Folding Polymers and Their Asymmetric Catalytic Assembly

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2022年第2期2022卷 307-314页

作者： Yao Tang shengzhou jin Sai Zhang Guan-Zhao Wu Jia-Yin Wang Ting Xu Yu Wang Daniel Unruh Kazimierz Surowiec Yanzhang Ma Shiren Wang Courtney Katz Hongjun Liang Yunze Li Wellong Cong Guigen Li Department of Chemistry and Bochemistry Texas Tech UiniversityLubockTexas 79409-1061USA Institute of Chemistry and Biomedical Sciences School of Chermistry and Chemical EngineeringNanjing UnivrsityNanjing 210093China Department of Mechanical Engineering Texas Tech UniversilyLubockTexas 79409-1061USA Deparment of Indusrtrial。Systems Enginering Texas ACM UniversiyCollege StationTexas 77843USA Deparment of Cell Plhysiology and Molecular Biophysics School of MedicineTexas Tech University Heath Sciemces CenterLubbockTX 79430-6551.USA Department of Indiustrial Engineering Texas Tech UniversityLubookTexas 79409.3061USA

A novel class of polymers and oligomers of chiral folding chirality has been designed and synthesized,showing structurally compacted triple.column/multiple layer frameworks.Both uniformed and diferentiated aromatic chromophoric units were successfully constructed between naphthy!piers of this framework.Screening monomers,catalysts,and catalytic systems led 1o the success of asymmetric catalytic Suzuki-Miyaura polycouplings Enantio-and diastereochemistry were unambiguously determined by X-ray structural analysis and concurrently by comparison with a similar asymmetric induction by the same catalyst in the asymmetric synthesis of a chiral three layered product.The resuling chiral polymers exhibit intense fluorescence activity in a solid form and solution under speci fic wavelength irradiation.

关键词： chiral asymmetric Catalytic

民族主义与世界主义之间:柏林浪漫派共同体书写初探

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

同济大学学报（社会科学版） 2024年第2期35卷 14-22页

作者：卢盛舟南京大学外国语学院南京210023

活跃于19世纪初德意志思想舞台的柏林浪漫派对共同体的理论建构与文学书写做出过重要贡献。政治哲学家亚当·米勒在1809年出版的《治国术》中提出了强调整体性、自然性和历史性的共同体理论主张,而柏林浪漫派作家既或隐或显地对民族共... 详细信息

活跃于19世纪初德意志思想舞台的柏林浪漫派对共同体的理论建构与文学书写做出过重要贡献。政治哲学家亚当·米勒在1809年出版的《治国术》中提出了强调整体性、自然性和历史性的共同体理论主张,而柏林浪漫派作家既或隐或显地对民族共同体展开文学想象,又通过交谊结社为实现民族共同体开展政治实践。在他们的共同体书写中,除以往大多数研究所确认的民族主义内涵外,还存在重要的世界主义维度:相关作家并不囿于民族国家疆界,而是在世界范围内思考民族共同体的建构和与文化他者的共生问题——民族独立、帝国殖民、和谐共存等多重欲望在此纠缠交错,民族主义与世界主义也因此并非变奏关系,而是呈现出了间性特征。

关键词：柏林浪漫派共同体民族主义世界主义

Triple-Columned and Multiple-Layered 3D Polymers:Design,Synthesis,Aggregation-Induced Emission(AIE),and Computational Study

在线全文

学校读者我要写书评

暂无评论

Research 2021年第1期2021卷 112-124页

作者： Guanzhao Wu Yangxue Liu Zhen Yang Liulei Ma Yao Tang Xianliang Zhao Hossein Rouh Qixuan Zheng Peng Zhou Jia-Yin Wang Farhan Siddique Sai Zhang shengzhou jin Daniel Unruh Adelia JAAquino Hans Lischka Kristin M.Hutchins Guigen Li Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTexas 79409-1061USA Institute of Chemistry and Biomedical Sciences School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China School of Pharmaceutical Sciences and Technology Tianjin UniversityTianjin 300072China Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79409USA

Conjugated polymers and oligomers have great potentials in various fields,especially in materials and biological sciences because of their intriguing electronic and optoelectronic properties.In recent years,the through-space conjugation system has emerged as a new assembled pattern of multidimensional polymers.Here,a novel series of structurally condensed multicolumn/multilayer 3D polymers and oligomers have been designed and synthesized through one-pot Suzuki polycondensation(SPC).The intramolecularly stacked arrangement of polymers can be supported by either X-ray structural analysis or computational analysis.In all cases,polymers were obtained with modest to good yields,as determined by GPC and 1 H-NMR.MALDI-TOF analysis has proven the speculation of the step-growth process of this polymerization.The computational study of ab initio and DFT calculations based on trimer and pentamer models gives details of the structures and the electronic transition.Experimental results of optical and AIE research confirmed by calculation indicates that the present work would facilitate the research and applications in materials.

关键词： properties transition materials

Orientational Chirality,Its Asymmetric Control,and Computational Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2023年第1期2022卷 545-552页

作者： shengzhou jin Yu Wang Yao Tang Jia-Yin Wang Ting Xu Junyi Pan Sai Zhang Qiankai Yuan Anis Ur Rahman James D.McDonald Guo-Qiang Wang Shuhua Li Guigen Li School of Chemistry and Chemical Engineering Nanjing UniversityNanjing210093China Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTX 79409-1061USA Continuous Flow Engineering Laboratory of National Petroleum and Chemical Industry Changzhou UniversityChangzhouJiangsu 213164China

Orientational chirality was discovered and characterized by a C(sp)-C(sp3)axis-anchored chiral center and a remotely anchored blocker.X-ray structural analysis proved that orientatiomers are stabilized by through-space functional groups,making it possible for 1 R-or S-chiral center to exhibit 3 orientational isomers simply by rotating operations.A new model system was proposed,fundamentally different from the traditional Felkin-Ahn-type or Cram-type models.In these traditional models,chiral C(sp^(3))center and blocking C(sp^(3))carbons are connected adjacently,and there exist 6 energy barriers during rotating along the C(sp^(2))-C(sp^(3))axis.In comparison,the present orientational chirality model shows that a chiral C(sp)-C(sp^(3))carbon is remotely located from a blocking group.Thus,it is focused on the steric dialog between a chiral C(sp^(3))center and a remotely anchored functional group.There exist 3 energy barriers for either(R)-or(S)-C(sp)-C(sp^(3))stereogenicity in the new model.Chiral amide auxiliary was proven to be an excellent chiral auxiliary in controlling rotations of orientatiomers to give complete stereoselectivity.The asymmetric synthesis of individual orientatiomers was conducted via multistep synthesis by taking advantage of the Suzuki-Miyaura cross-coupling and Sonogashira coupling reactions.Density functional theory computational study presented optimized conformers and relative energies for individual orientatiomers.This discovery would be anticipated to result in a new stereochemistry topic and have a broad impact on chemical,biomedical,and material sciences in the future.

关键词： chiral Chiral rotating

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

杉木ClCRY2基因克隆及表达特性分析

四川农业大学学报 2024年第3期42卷 620-627页

作者：郭胜周廖文海李婧姝邓煜钊曹光球曹世江福建农林大学林学院福州350002 国家林业草原杉木工程技术研究中心福州350002 林木逆境生理生态及分子生物学福建省高校重点实验室福州350002

【目的】通过克隆杉木隐花色素CRY2基因,研究其在不同组织和不同光质处理下的表达特性,为探索CRY2基因在杉木生长发育过程中的调控作用提供参考。【方法】以1 a生杉木优良无性系061扦插苗为试验材料,基于课题组杉木全长转录组测序的结果... 详细信息

【目的】通过克隆杉木隐花色素CRY2基因,研究其在不同组织和不同光质处理下的表达特性,为探索CRY2基因在杉木生长发育过程中的调控作用提供参考。【方法】以1 a生杉木优良无性系061扦插苗为试验材料,基于课题组杉木全长转录组测序的结果,利用逆转录聚合酶链式反应(RT-PCR)技术,设计基因特异性引物,从无性系杉木苗嫩叶中克隆CRY2基因,命名为ClCRY2(登录号为PP400318)。对其进行生物信息学分析,并利用实时荧光定量PCR技术分析其表达情况。【结果】生物信息学分析结果显示,杉木的ClCRY2基因CDs区全长2 151 bp,共编码716个氨基酸,与拟南芥中AtCRY2蛋白序列的同源一致性为68.93%。进化树分析发现ClCRY2蛋白与日本柳杉(Cryptomeria japonica)CjCRY2的亲缘性最近。ClCRY2蛋白二级结构主要以无规则卷曲(random curls)和α-螺旋(alpha helix)为主,分别为51.26%和34.78%。ClCRY2蛋白分子式为C3 620H5 573N1 033O1 063S27,理论等电点为6.46,占比最大的氨基酸为亮氨酸(leucine)占9.8%,其次是丝氨酸(serine),占8.0%。ClCRY2蛋白为亲水性蛋白,不具有跨膜区,无信号肽。实时荧光定量PCR分析结果:ClCRY2基因在杉木苗木根茎叶中均有表达,其中茎中的表达量最高,叶中次之,根中表达量最低;蓝光能显著增加ClCRY2基因的表达。【结论】通过对ClCRY2基因所编码的蛋白的理化性质和结构的研究,推测其在杉木茎和叶片发育进程中起重要的调控作用,参与蓝光信号的传导过程。

关键词：杉木隐花色素 ClCRY2基因生物信息学表达分析

在线全文

学校读者我要写书评

暂无评论

宋青白瓷纹饰中的秩序之美

陶瓷 2024年第4期 135-136,168页

作者：何圣州杨文静景德镇艺术职业大学江西景德镇333000 吉安幼儿师范高等专科学校江西吉安343000

秩序之美是青白瓷纹饰艺术中最核心、最本质、最具代表性的一种审美形式。在整个青白瓷纹饰艺术中,秩序之美一直扮演着至关重要的角色,它既是人们对美好生活向往与追求的体现,也是人们对客观世界理解与感悟后所形成的一种理想境界。

关键词：青白瓷纹饰设计秩序感

维普期刊数据库博看期刊

High‑Quality Epitaxial N Doped Graphene on SiC with Tunable Interfacial Interactions via Electron/Ion Bridges for Stable Lithium‑Ion Storage

在线全文

学校读者我要写书评

暂无评论

纳微快报:英文版 2023年第11期15卷 185-204页

作者： Changlong Sun Xin Xu Cenlin Gui Fuzhou Chen Yian Wang shengzhou Chen Minhua Shao Jiahai Wang School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006People’s Republic of China Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongPeople’s Republic of China

Tailoring the interfacial interaction in SiCbased anode materials is crucial to the accomplishment of higher energy capacities and longer cycle lives for lithium-ion storage.In this paper,atomic-scale tunable interfacial interaction is achieved by epitaxial growth of high-quality N doped graphene(NG)on SiC(NG@SiC).This well-designed NG@SiC heterojunction demonstrates an intrinsic electric field with intensive interfacial interaction,making it an ideal prototype to thoroughly understand the configurations of electron/ion bridges and the mechanisms of interatomic electron migration.Both density functional theory(DFT)analysis and electrochemical kinetic analysis reveal that these intriguing electron/ion bridges can control and tailor the interfacial interaction via the interfacial coupled chemical bonds,enhancing the interfacial charge transfer kinetics and preventing pulverization/aggregation.As a proof-of-concept study,this well-designed NG@SiC anode shows good reversible capacity(1197.5 mAh g^(−1)after 200 cycles at 0.1 A g^(−1))and cycling durability with 76.6%capacity retention at 447.8 mAh g^(−1)after 1000 cycles at 10.0 A g^(−1).As expected,the lithium-ion full cell(LiFePO_(4)/C//NG@SiC)shows superior rate capability and cycling stability.This interfacial interaction tailoring strategy via epitaxial growth method provides new opportunities for traditional SiC-based anodes to achieve high-performance lithium-ion storage and beyond.

关键词： SiC Heterojunction Interfacial engineering Lithium-ion battery DFT calculation

Enhanced electrochemical performance of garnet-based solid-state lithium metal battery with modified anodic and cathodic interfaces

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第4期35卷 140-147页

作者： Deen Yan Huangwang Mai Wen Chen Wei Yang Hanbo Zou shengzhou Chen School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China Guangzhou Tinci Materials Technology Co. Ltd.Guangzhou 510760China

Due to high ionic conductivity and wide electrochemical window,the garnet solid electrolyte is considered as the most promising candidate electrolyte for solid-state lithium metal batteries.However,the high contact impedance between metallic lithium and the garnet solid electrolyte surface seriously hampers its further application.In this work,a Li-(ZnO)_(x)anode is prepared by the reaction of zinc oxide with metallic lithium and in situ coated on the surface of Li_(6.8)La_(3)Zr_(1.8)Ta_(0.2)O_(12)(LLZTO).The anode can be perfectly bound to the surface of LLZTO solid electrolyte,and the anode/electrolyte interfacial resistance was reduced from 2319 to 33.75Ω·cm^(2).The Li-(ZnO)_(0.15)|LLZTO|Li-(ZnO)_(0.15) symmetric battery exhibits a stable Li striping/plating process during charge-discharging at a constant current density of0.1 m A·cm;for 100 h at room temperature.Moreover,a Li-(ZnO)_(0.15)|LLZTO-SPE|LFP full battery,comprised of a polyethylene oxide-based solid polymer electrolyte(SPE)film as an interlayer between LiFePO4(LFP)cathode and LLZTO solid electrolyte,presents an excellent performance at 60℃.The discharge capacity of the full battery reaches 140 mA·h·g^(-1)at 0.1 C and the capacity attenuation is less than3%after 50 cycles.

关键词： Lithium metal battery Solid-state electrolyte Li-ZnO anode