检索结果-南通市图书馆

Achieving High-Performance molecular Rectification through Fast Screening Alkanethiol Carboxylate- Metal Complexes Electroactive Units

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2023年第4期5卷 902-914页

作者： Lixian Tian Aiqing Fan Xi Yu Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Science School of ScienceTianjin UniversityTianjin 300072

Achieving high performance in molecular scale diode devices remains a formidable challenge due to the complexity of the charge transport process and the difficulty in device structure modulation.Herein,we demonstrated a low-cost and fast screening strategy to search for proper electroactive units and construct high performance self-assembled monolayer(SAM)-based molecular diodes.The strategy is based on off-the-shelf carboxylate-terminated alkane thiols and simple carboxylate-metal ion complexes,structures denoted as Au-S-(CH2)n-1COO−Mm+(Cn+Mm+),where n=11,12,13,14,16,18,and Mm+=Ca^(2+),Mn^(2+),Fe_(2)+,Fe3+,Co^(2+),Ni^(2+),Cu^(2+),and Zn^(2+),as the library of functional SAM layers on gold substrate.Combing the fast screening measurements using a eutectic indium-gallium alloy top contact(EGaIn),C18+Ca^(2+)and C18+Zn^(2+)structures were found to afford record high rectification ratio(RR)>700 at±1.5 V.Theoretical analysis based on a single level tunneling model shows that the C18+Ca^(2+)and C18+Zn^(2+)devices possessed an optimized combination of asymmetric voltage division,energy offset,and coupling of carboxylate-metal complexes with the electrode.This newly developed method represents a general strategy for fast,inexpensive,and effective exploration of the functional metal complex chemical space,and can largely accelerate the development of practical high performance molecular diode devices.

关键词： molecular diode EGaIn self-assembled monolayer screening

高拉伸高迁移率半导体纳米纤维共混薄膜应用于完全可拉伸有机晶体管

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2023年第5期66卷 1891-1898页

作者：邬福明刘忆旋张鋆李湘湘杨辉胡文平 Tianjin Key Laboratory of Molecular Optoelectronic Science Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China

可拉伸有机场效应晶体管(OFETs)是有机集成电路和可穿戴生物传感器的基本组成部分.可拉伸有机半导体是实现高迁移率可拉伸OFETs的核心材料.目前实现高迁移率高拉伸聚合物半导体仍面临挑战.在此,我们通过混合聚合物半导体和弹性体,制备... 详细信息

可拉伸有机场效应晶体管(OFETs)是有机集成电路和可穿戴生物传感器的基本组成部分.可拉伸有机半导体是实现高迁移率可拉伸OFETs的核心材料.目前实现高迁移率高拉伸聚合物半导体仍面临挑战.在此,我们通过混合聚合物半导体和弹性体,制备了高迁移率可拉伸的半导体共混薄膜.通过纳米限域效应,聚合物形成独特的纳米纤维.半导体薄膜具有低结晶度和高聚集度,因此该纤维共混薄膜具有高迁移率和高拉伸性.我们制备的完全可拉伸的有机晶体管在0%和100%应变下空穴迁移率分别为2.74和2.53 m^(2)V^(-1)s^(-1).即使在150%应变下,可拉伸晶体管的迁移率也高达1.57 cm^(2)V^(-1)s^(-1).可拉伸晶体管在30%应变下的1000个拉伸/释放周期中表现出了高的机械鲁棒性.

关键词： high-mobility stretchable semiconductors nanofibers organic transistors

Electrosynthesis of ^(15)N-labeled amino acids from ^(15)N-nitrite and ketonic acids

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第6期66卷 1854-1859页

作者： Yongmeng Wu Mengyang Li Tieliang Li Jinghui Zhao Ziyang Song Bin Zhang Department of Chemistry School of ScienceInstitute of Molecular PlusTianjin UniversityTianjin 300072China Tianjin Key Laboratory of Molecular Optoelectronic Science Key Laboratory of Systems Bioengineering(Ministry of Education)Tianjin UniversityTianjin 300072China

^(15)N isotope-labeled amino acids(^(15)N-amino acids)are crucial in the fields of biology,medicine,and chemistry.^(15)N-amino acids are conventionally synthesized through microbial fermentation and chemical reductive amination of ketonic acids methodologies,which usually require complicated procedures,high temperatures,or toxic cyanide usage,causing energy and environmental concerns.Here,we report a sustainable pathway to synthesize ^(15)N-amino acids from readily available ^(15)N-nitrite(^(15)NO_(2)-)and biomass-derived ketonic acids under ambient conditions driven by renewable electricity.A mechanistic study demonstrates a ^(15)N-nitrite→^(15)NH_(2)OH→^(15)N-pyruvate oxime→^(15)N-alanine reaction pathway for ^(15)N-alanine synthesis.Moreover,this electrochemical strategy can synthesize six ^(15)N-amino acids with 68%–95%yields.Furthermore,a ^(15)N-labeled drug of ^(15)N-tiopronin,the most commonly used hepatitis treatment drug,is fabricated using ^(15)N-glycine as the building block.Impressively,^(15)N sources can be recycled by the electrooxidation of ^(15)NH4^(+) to ^(15)NO_(2)-with a method economy.This work opens an avenue for the green synthesis of ^(15)N-labeled compounds or drugs.

关键词： green synthesis ^(15)N-labeled amino acids electrosynthesis C-N bond isotope labeling

Ni-catalyzed highly regio- and stereo-selective diborylative cyclization of 1,6-enynes with diboron reagent

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第3期67卷 981-989页

作者： Qitao Guan Zhen Shen Yiqiang Tian Genping Huang Chun Zhang Institute of molecular Plus Tianjin Key Laboratory of Molecular Optoelectronic ScienceDepartment of ChemistrySchool of SciencesTianjin UniversityTianjin 300072China State key laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071China

The Ni-catalyzed highly selective diborylative cyclization of 1,6-enynes with diboron reagent has been developed. When pinB-Bdan was used, multiple types of boron-containing functional groups could be installed into organic molecule with great chemoselectivity and regioselectivity though this reaction. Meanwhile, if B_2pai_2 was employed, the asymmetric diborylative cyclization could be well induced by using strategy of dynamic kinetic resolution. Importantly, the above reactions could afford desired product with 100% atomic economy, and could be compatible with different series of substituents. The studies of further transformation well illustrated that different type products could serve diverse synthetic strategy. Notably, the reaction mechanism was intensively studied by density functional theory(DFT) calculations, which could reveal the mechanism of regio- and enantio-selective control.

关键词： nickel-catalyzed organoboron cyclization regioselectivity enantioselectivity

Palladium-Catalyzed Intramolecular Dehydrogenative Arylboration of Alkenes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2022年第20期40卷 2437-2444页

作者： Chenchen Zou Hongli Wu Yuqi Ji Penglin Zhang Huanhuan Cui Genping Huang Chun Zhang Institute of molecular Plus Tianjin Key Laboratory of Molecular Optoelectronic ScienceDepartment of ChemistrySchool of ScienceTianjin UniversityTianjin300072 China State key laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin300071 China

The palladium-catalyzed borylative cyclization via C—H activation has been developed.By this chemistry,the indole-fused dihydro-pyrrole motif,which is a kind of important unit in natural products and bio-active molecules,could be constructed and installed with a boric ester group.Furthermore,the utilities of products have been illustrated by the study of further transformations.Importantly,by using chiral ligand,the enantioselectivity of this borylative cyclization reaction could be controlled.Moreover,the borylative mechanism,which should proceed through a Pd(II)/Pd(IV)catalytic cycle,has been proposed based on the DFT calculations.

关键词： Palladium Dehydrogenative coupling reaction Indole-fused dihydro-pyrrole Boron

基于基态和激发态之间跃迁过程的DBTTF-TCNB共晶的光热转换机制

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2024年第1期67卷 242-250页

作者：付思姚何旦张小涛 key laboratory of Organic Integrated Circuits Ministry of Education&Tianjin Key Laboratory of Molecular Optoelectronic SciencesDepartment of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China key laboratory of Organic Integrated Circuits Ministry of Education&Tianjin Key Laboratory of Molecular Optoelectronic SciencesDepartment of ChemistryInstitute of Molecular Aggregation ScienceTianjin UniversityTianjin 300072China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

有机共晶,由于其光热转换性质,为光热成像、生物应用和海水淡化等诸多领域带来了希望和活力.然而,有机共晶的光热转换机制尤其缺少详细且深入的理论研究.本研究使用含时密度泛函理论方法探索了激发和去激发过程,并解释了DBTTF-TCNB共晶... 详细信息

有机共晶,由于其光热转换性质,为光热成像、生物应用和海水淡化等诸多领域带来了希望和活力.然而,有机共晶的光热转换机制尤其缺少详细且深入的理论研究.本研究使用含时密度泛函理论方法探索了激发和去激发过程,并解释了DBTTF-TCNB共晶比其组分单晶具有更高光热转换效率的原因.结果显示,高激发态的高占比促进了非辐射跃迁的发生.基于DBTTF-TCNB共晶中给电子基团和吸电子基团间的电荷转移结果,我们发现给体和受体之间吸引电子的竞争可能会促进光热转换,且给电子基团在共晶结构中也十分重要.这些结果可为光热转换共晶的设计提供理论指导.轨道贡献和电子密度差进一步证明了我们的结论.因此,本研究从量子化学的角度给光热共晶在创新领域的应用提供了理论依据.

关键词：光热转换含时密度泛函理论激发过程生物应用吸电子基团非辐射跃迁高激发态共晶结构

Diazocine as a Versatile Building Block Enables Excellent Photoswitching and Chromic Properties in Self-Assembled Organogels

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2022年第2期4卷 704-712页

作者： Yingying Wang Mengwei Li Chunmei Yan Ning Ma Yulan Chen Tianjin Key Laboratory of Molecular Optoelectronic Science Department of ChemistryInstitute of Molecular PlusTianjin UniversityTianjin 300354

Novel types of photoresponsive organogelators containing a diazocine moiety have been synthesized,and their gelation behaviors have been characterized systematically.Subtle changes in the pendant structure of these bent-core molecules cause significant changes in the molecular packing mode in their self-assembled gels.By making use of the unconventional conformational and photochromic properties of the diazocine core,the obtained gels exhibited excellent photoswitching and-chromic properties.For the first time,the diazocine unit has been demonstrated as a versatile building block to construct photoresponsive supramolecular gels.The sensitive interconversion between multiple states of these chromic gels highlights their promising applications in fabricating logic gates with appropriate addressing mode(stimulated by visible light or heating).

关键词： diazocine photochromic photoisomerization self-assembly supramolecular gels

Sn-Bi bimetallic interface induced by nano-crumples for CO_(2) electroreduction to formate

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2022年第12期41卷 3943-3945页

作者： Li Li Zhi-Cheng Zhang Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China

Electrochemical carbon dioxide(CO_(2))reduction reaction(CO_(2)RR),powered by a renewable energy source,to valueadded chemicals and fuels is a promising solution to mitigate the ever-increasing CO_(2)emission and buil... 详细信息

关键词： dioxide carbon Electrochemical

Cocrystal engineering:towards high-performance near-infrared organic phototransistors based on donor-acceptor charge transfer cocrystals

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第1期66卷 266-272页

作者： Fei Li Lei Zheng Yajing Sun Shuyu Li Lingjie Sun Fangxu Yang Weibing Dong Xiaotao Zhang Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Institute of Molecular Aggregation Science of Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Molecular Optoelectronic Sciences School of ScienceTianjin UniversityTianjin 300072China Joint School of National University of Singapore and tianjin University International Campus of Tianjin UniversityFuzhou 350207China key laboratory of Resource Chemistry and Eco-environmental Protection in Qinghai-Tibet Plateau Qinghai Minzu UniversityXining 810007China

Near-infrared organic phototransistors have wide application prospects in many fields.The active materials with the high mobility and near-infrared response are critical to building high-performance near-infrared organic phototransistors,which are scarce at present.Herein,a new charge transfer cocrystal using 5,7-dihydroindolo[2,3-b]carbazole(5,7-ICZ)as the donor and 2,2’-(benzo[1,2-b:4,5-b’]dithiophene-4,8-diylidene)dimalononitrile(DTTCNQ)as the acceptor is properly designed and prepared in a stoichiometric ratio(D:A=1:1),which not only displays a high electron mobility of 0.15 cm^(2)V^(-1)s^(-1) and very low dark current,but also can serve as the active layer materials in the region of near-infrared detection due to the narrowed band gap and good charge transport properties.A high photosensitivity of 1.8×10^(4),the ultrahigh photoresponsivity of 2,923 A W-1and the high detectivity of 4.26×10^(11)Jones of the organic near-infrared phototransistors are obtained.

关键词： organic semiconductors charge transporting properties organic cocrystals organic field effect transistors near-infrared organic phototransistors