检索结果-南通市图书馆

Denitration of Nitroarenes Under Ambient Physiological Conditions Catalyzed by Graphdiyne-Supported Palladium

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第3期6卷 641-651页

作者： Endong Zhang Yanyan Chen Fengting Lv Zicheng Zuo Feng He Yongjun Li Yiming Huang Yuliang Li Shu Wang Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 College of Chemistry University of Chinese Academy of SciencesBeijing 100049

The direct cleavage of C–NO_(2)bonds for reductive denitration of nitroarenes remains a challenging transformation in synthetic organic ***,we report a biocompatible palladium-deposited graphdiyne nanocatalyst(Pd@GDY/DSPE-PEG)that can catalyze reductive denitration of nitroarenes under ambient physiological *** studies support this transformation via the oxidative addition of nitroarenes with Pd(0)and subsequent ligand exchange to form arylpalladium *** one-step reductive denitration via Pd@GDY/DSPE-PEG successfully facilitates the repair of the nitrated proteins arising from endogenic ONOO−and restores their physiological function,including blocking the apoptosis pathway in living ***,Pd@GDY/DSPE-PEG was further successfully applied for catalytic denitration to reduce the level of 3-nitrotyrosine residues of proteins located in the mouse brain hippocampus in *** study provides an ideal strategy for designing highly active enzymatic mimicking synthetic catalysts for the regulation of the nitrated protein level and the detoxification of nitrative damage of living cells and tissues.

关键词： 3-nitrotyrosine artificial nanaocatalysts reductive denitration palladium-deposited graphdiyne repairing nitrated protein

Multifunction-oriented high-mobility polymer semiconductors

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

National Science Review 2024年第3期11卷 16-19页

作者： Mingliang Zhu Yunlong Guo Yunqi Liu Beijing National Laboratory for Molecular Sciences Organic Solids Laboratory Institute of Chemistry Chinese Academy of Sciences School of Chemical Sciences University of Chinese Academy of Sciences

The discovery of conductive polyacetylene has initiated interdisciplinary research into condensed matter physics and synthetic chemistry in organic electronics. Unlike their inorganic and small-molecule counterparts, polymer semiconductors possess the inherent advantages of facile solution processing,large-area manufacturing, excellent mechanical strength and intrinsic flexibility.

关键词：

Photoluminescent nickel(Ⅱ)carbene complexes with ligand-to-ligand charge-transfer excited states

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第1期35卷 357-360页

作者： Chun-Liang Hou Jia-Xi Song Xiaoyong Chang Yong Chen Key Laboratory of Photochemical Conversion and Optoelectronic Materials&cas-HKU joint Laboratory on New Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China

While nickel(II)complexes have been widely used as catalysts for carbon-carbon coupling reactions,the exploration of their photophysical and photochemical properties is still in the ***,a series of square-planar Ni(II)complexes[(diNHC)NiX2]bearing chelating benzimidazole-based bis(N-heterocyclic carbene)ligands and varying anionic coligands(1,X=Cl;2,X=Br;3,X=I)are synthesized and structurally *** solid state,both 1 and 2 exhibit orange-red photoluminescence under ambient *** photophysical and electrochemical measurements along with density functional theory(DFT)calculations reveal that the low-energy emissions can be attributed to singlet excited states with ligand-to-ligand charge-transfer(LLCT)*** work suggests that strong-field N-heterocyclic carbene ligands play a crucial role to achieve the luminescence of Ni(II)complexes.

关键词： Nickel(II)complexes N-Heterocyclic carbene Luminescence Ligand-to-ligand charge-transfer character Low-lying d-d excited states

A mechanically stable self-pumping organohydrogel dressing with aligned microchannels for accelerated diabetic wound healing

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2024年第9期67卷 2995-3002页

作者： Wuyi Xiao Xizi Wan Yikai Zhang Jinze Lan Lianxin Shi Shutao Wang cas Key Laboratory of Bio-Inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Suzhou Institute for Advanced Research University of Science and Technology of ChinaSuzhou215123China

Self-pumping dressings(SPDs)have been developed as a new type of effective material for the drainage of excessive wound exudates based on the structure of asymmetric ***,current SPDs are easy to lose their asymmetric wettability due to the weak interfacial mechanical stability between the hydrophobic and hydrophilic ***,we report an integrated self-pumping organohydrogel dressing with aligned microchannels(SPD-AM),prepared by an ice-templating-assisted wetting-enabled-transfer(WET)polymerization strategy,that can accelerate the healing process of diabetic *** WET polymerization strategy enables strong interfacial mechanical stability between the hydrophobic organogel and hydrophilic hydrogel *** aligned microchannels greatly improve the draining capability of *** a diabetic rat model as an example,the SPD-AM can significantly reduce the bacterial colonization with low inflammatory responses,enhance dermal remodeling by about 47.31%,and shorten wound closure time by about 1/5 compared with other dressings,ultimately accelerating diabetic wound *** study is valuable for developing next-generation SPDs with stable mechanical performance for clinical applications.

关键词： SPDs mechanically stable interfaces WET strategy ice-templating organohydrogel diabetic wounds

Electric-Induced Cycloelimination for Simulating Structural Plasticity in Organic Nociceptors

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第6期6卷 1466-1476页

作者： Zhiheng Zhu Kai Liu Haojie Huang Yangshuang Bian Mingcong Qin Chengyu Wang Wei Wen Mingliang Zhu Wenkang Shi Yanwei Liu Zhiyuan Zhao Huijuan Yan Hanlin Wang Yunqi Liu Yunlong Guo Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100190

Continuous lifelong acquisition,updating,and finetuning of knowledge and skills is of crucial significance for the survival of ***,current neuromorphic devices exhibit obvious catastrophic forgetting when restimulated by new *** remains a challenge for neuromorphic devices and artificial intelligence to achieve continuous ***,we propose an electric-induced cycloelimination strategy to realize an organic transistor nociceptor that can simulate synaptic and structural *** system benefits from the ring-opening characteristics of cross-linked poly(vinyl cinnamate)under a strong pulse voltage,during which new energy-level trap states are *** prepared organic transistor nociceptors exhibit both structural and synaptic *** simulate the characteristics of human nociceptors,including threshold,relaxation,sensitization,and maladaptation *** the first time,we have simulated and explored the structural plasticity behavior in organisms based on electronic *** remarkably,the transistor nociceptors realize the reinput of information without forgetting the initial informa *** strategy developed for the preparation of organic transistor nociceptors provides insights for addressing the catastrophic forgetting in the lifelong learning of intelligent neuromorphic devices.

关键词： electric-induced cycloelimination structural plasticity organic nociceptors organic transistors metaplasticity

Effects of length alteration of OPE-containing mono- and dinuclear alkynylplatinum(II) terpyridine complexes on photophysical, structural and morphological properties

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

Nano Research 2024年第10期17卷 8893-8903页

作者： Jason Koon-Lam Poon Sammual Yu-Lut Leung Eric Ka-Ho Wong Vivian Wing-Wah Yam Institute of Molecular Functional Materials State Key Laboratory of Synthetic Chemistry and Department of ChemistryThe University of Hong KongHong Kong 999077China

A series of mononuclear complexes and unsymmetric dinuclear alkynylplatinum(II)terpyridine complexes with oligo(paraphenylene ethynylene)(OPE)-derived backbone with a variation of the lengths of alkoxy chains and OPE backbones was *** morphological properties,packing lattice and gelation behaviors of the mononuclear complexes were systematically studied,and the thermodynamic parameters and packing lattices of the dinuclear complexes were also investigated,providing further insights into the roles of the non-covalent interactions and their delicate balance in constructing sophisticated supramolecular *** and nanotube formation have been observed upon a delicate control of the intermolecular interactions by altering the lengths and structural dimensions of the complexes.

关键词： supramolecular chemistry self-assembled nanostructures platinum(II)complexes metallogel

Recess-free enhancement-mode AlGaN/GaN RF HEMTs on Si substrate

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

Journal of Semiconductors 2024年第6期45卷 81-86页

作者： Tiantian Luan Sen Huang Guanjun Jing Jie Fan Haibo Yin Xinguo Gao Sheng Zhang Ke Wei Yankui Li Qimeng Jiang Xinhua Wang Bin Hou Ling Yang Xiaohua Ma Xinyu Liu High-Frequency High-Voltage Device and Integrated Circuits R&D Center Institute of Microelectronics of Chinese Academy of SciencesBe i-jing 100029China School of integrated Circuits University of Chinese Academy of SciencesBeijing 100049China Faculty of integrated Circuits Xidian UniversityXi’an 710071China

Enhancement-mode(E-mode)GaN-on-Si radio-frequency(RF)high-electron-mobility transistors(HEMTs)were fabri-cated on an ultrathin-barrier(UTB)AlGaN(<6 nm)/GaN heterostructure featuring a naturally depleted 2-D electron gas(2DEG)*** fabricated E-mode HEMTs exhibit a relatively high threshold voltage(VTH)of+1.1 V with good uniformity.A maxi-mum current/power gain cut-off frequency(fT/fMAX)of 31.3/99.6 GHz with a power added efficiency(PAE)of 52.47%and an out-put power density(Pout)of 1.0 W/mm at 3.5 GHz were achieved on the fabricated E-mode HEMTs with 1-μm gate and Au-free ohmic contact.

关键词： AlGaN/GaN heterostructure ultrathin-barrier enhancement-mode radio-frequency power added efficiency silicon substrate

Recent progress in circularly polarized multi-resonance thermally activated delayed fluorescence materials for organic light-emitting diodes

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年

作者： He Jiang Dan Ai Jibiao Jin Zheng Xie Wai-Yeung Wong Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University School of Chemistry and Chemical Engineering University of Jinan The Hong Kong Polytechnic University Shenzhen Research Institute

Circularly polarized luminescence(CPL) is of importance to advance science and technology with significant potential applications in information storage, spintronics and optoelectronic devices. Integrating CPL and the emission mechanism of thermally activated delayed fluorescence(TADF) has attracted considerable attention, because of their 100% internal quantum efficiency in theory and easily modified molecular structures for tunable photo-electrical properties. However, the typical donor-acceptor(D-A) architecture of CP-TADF emitters generally induces a broad emission profile with inferior color purity due to their large structural relaxation under the processes of excitation and emission. Recently, CP-multi-resonance(MR)-TADF emitters that concurrently display CPL activity, narrowband emission and high efficiency are emerging as the most suitable candidates for the next-generation organic light-emitting diode(OLED) display. In this review, the progress of CP-MR-TADF materials is reviewed in terms of the molecular design strategy, the common relationship between the molecular structures and optoelectronic properties, and their OLEDs performance. Finally, the opportunities and challenges in this research topic are discussed.

关键词：

Ultralow Ohmic Contact in Recess-Free Ultrathin Barrier AlGaN/GaN Heterostructures Across a Wide Temperature Range

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年

作者： Yuhao WANG Sen HUANG Qimeng JIANG Xinhua WANG Jie FAN Haibo YIN Ke WEI Yingkui ZHENG Xinyu LIU Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics of Chinese Academy of Sciences Institute of Microelectronics University of Chinese Academy of Sciences

‘Ohmic-before-passivation' process was implemented on ultrathin-barrier(UTB) AlGaN(<6 nm)/GaN heterostructure to further reduce the ohmic contact resistance(Rc). In this process, alloyed Ti/Al/Ni/Au ohmic metal was formed first, followed by AlN/SiNx passivation contributed to restore two-dimensional electron gas(2DEG) in the access region. Due to the sharp change in the concentration of 2DEG at the metal edge, a reduced transfer length(LT) consisted with lower Rc are achieved compared to that of ohmic contact on AlGaN(～20 nm)/GaN heterostructure with pre-ohmic recess process. Temperature-dependent current voltage measurements demonstrate that the carrier transport mechanism is dominated by thermionic field emission above 200 K and by field emission below 200 *** ‘ohmic-before-passivation' process enables the relative stability of ohmic contacts between 50 K to 475 K and significantly improves the DC characteristics of GaN-MIS-HEMTs, offering a promising means for scaling down and enabling the utilization of low-voltage GaN-based power devices in extreme environmental conditions.

关键词：