检索结果-南通市图书馆

Tuning Solvent Composition to Enhance the Stability of metal clusters in Mass Spectrometry

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第4期41卷 34-39页

作者： Yingzi Han Yihuang Jiang Jing Jeanne Yang Shuichao Lin Zichao Tang Lansun Zheng State Key Laboratory of Physical Chemistry of Solid Surface College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Electrospray ionization time-of-flight mass spectrometry(ESI-TOF-MS)has been recognized as a powerful technique for studying metal clusters’chemical composition and reaction *** is a great challenge in mass spectrometry analysis to maintain the metal cluster molecules intact without fragmentation,which is achieved in this work by using mixed solvents to change the interaction between cluster molecules and solvent molecules,further affecting the fragmentation behaviors of the metal cluster in *** analysis reveals that the stability of the[(C)Au_(6)Ag_(2)(C_(18)H_(14)ONP)_(6)]^(4+)cluster in ESI-TOF-MS is related to the strength of the chemical bonds between its own atoms and the bonding between the solvent and the cluster molecules.

关键词： metal cluster mass spectrometry fragmentation stability hydrogen bond

Pure metal clusters with Atomic Precision for Nanomanufacturing

在线全文

学校读者我要写书评

暂无评论

Nanomanufacturing and Metrology 2022年第3期5卷 230-239页

作者： Haiming Wu Hanyu Zhang Lijun Geng Yuhan Jia Benben Huang Mengzhou Yang Baoqi Yin Xin Lei Zhixun Luo Beijing National Laboratory for Molecular Sciences(BNLMS)and State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Advances in cluster science have enabled the preparation of atomically precise metal clusters with one to a hundred atoms under controllable expansion *** introducing typical gas-phase cluster preparation and reaction apparatuses,this work summarized recent progress in preparing pure metal clusters of single-atom resolution,including neutral and ionic ones,with typical examples of Al,V,Nb,Fe,Co,Ni,Rh,Pt,Ag,Cu,and *** the development of soft-landing deposition technology,the size-selective pure metal clusters with strict atomic precision and predictive property will benefit nanomanufacturing down to atomic and near-atomic *** work serves as a modest motivation to stimulate the interest of scientists focusing on interdisciplinary subjects.

关键词： metal cluster Gas phase cluster assembly Deposition Printing

Eco-Friendly Encapsulation of metal clusters in Porous Organic Cages for Engineerable Microenvironment and Enhanced Catalysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第9期6卷 2186-2197页

作者： Siyu Ren Liangxiao Tan Jun-Hao Zhou Jian Sun Peng Zhang Xingzhong Cao Yun-Hong Zhang Jian-Ke Sun MOE Key Laboratory of cluster Science Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 102488 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049

Developing artificial catalysts that mimic the functionality of enzymes and adapt to the surrounding microenvironment to achieve specific activity and selectivity is a fascinating research area yet remains a great *** this work,we present a meticulously designed strategy for the successful encapsulation of ultrasmall metal clusters(MCs)within an amine-type porous organic cage(POC)through electrostatic complexation,phase transfer,and alcohol reduction *** amine cage showcases an intriguing and customizable feature that allows for the regulation of the surrounding microenvironment of the confined MCs through a feasible postmodifi-cation *** functionalization of cage skeleton further facilitates precise adjustment to the surface electronic state of Pd cluster,thereby influencing the adsorption behavior of ***,this controlled regulation leads to modified activity and chemoselectivity in the catalytic hydrogenation of halogenated ***,the investigation of the correlation between the surrounding microenvironment,substrate adsorption,and catalytic performance in the POC-immobilized MCs system has not been previously *** anticipate that our research will provide valuable insights in this field.

关键词： metal cluster porous organic cage encapsulation microenvironment catalysis

Ligand accommodation causes altered reactivity of silver clusters with iodomethane:superatomic stability of Ag_(9)I_(2)^(+)in mimicking XeF_(2)

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 Chemistry 2022年第8期65卷 1594-1600页

作者： Haiming Wu Mengzhou Yang Benben Huang Wen Gan Zhixun Luo Beijing National Laboratory for Molecular Sciences(BNLMS) State Key Laboratory for Structural Chemistry of Unstable and Stable SpeciesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Exploring metal cluster reactivity with alkyl halides enables to understand the related chemical mechanism of metal surfaces in terms of active *** we report a study of Ag_(n)^(+)(n=1-27)clusters reacting with iodomethane by a flow tube apparatus in tandem with a customized triple quadrupole mass *** even/odd alternation of the Ag_(n)^(+)is observed in their reactions with CH_(3)I,where silver clusters with even-number,Ag_(2n)^(+),find favorable products of Ag_(2n)I_(1,3)^(+)series,while the Ag_(2n−1)^(+)clusters form Ag_(2n−1)I_(2,4)^(+)***,Ag_(9)^(+)shows up with prominent mass abundance but allows for the formation of Ag_(9)I_(2)^(+),which finds an echo with the formation of Ag_(10)I_(3)^(+).We illustrate the enhanced stability of Ag_(9)I_(2)^(+)and Ag_(10)I_(3)^(+)by showing their significantly enlarged highest occupied molecular orbital(HOMO)-lowest unoccupied molecular orbital(LUMO)gaps and balanced charge distribution compared with the bare metal clusters,*** elucidated,is the superatomic nature of these bare and iodinated silver clusters,especially Ag_(9)I_(2)^(+)which mimics the rare-gas compound XeF_(2).This study expands a vivid example of special and general superatoms,and enriches the general knowledge on how a ligand stabilizes a metal cluster.

关键词： metal cluster superatom halide superatomic complex gas-phase reaction

Structural insight into palladium-nickel clusters over mordenite zeolite for carbene-insertion reaction

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第9期18卷 89-99页

作者： Guangchao Li Ping-Luen Baron Ho Bryan Kit Yue Ng Tai-Sing Wu Pawel Rymarz Shik Chi Edman Tsang Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong Kong 999077China Department of Chemistry University of OxfordOxford OX13QRUK Synchrotron Radiation Research Center Hsinchu 30076China

The advancement of heterogeneous catalysts incorporating metal clusters in the nanometric size range has garnered significant attention due to their extraordinary catalytic activity and *** detailed characterization and understanding of the atomic structure of these metal clusters within catalysts is crucial for elucidating the underlying reaction *** the present study,a distinctive three-atom PdNi cluster,characterized by two Pd atoms at terminal positions and a central Ni atom,was synthesized over mordenite *** presence of atomic PdNi clusters within the eight-membered ring side pocket area was confirmed by multiple advanced analytical techniques,including magic-angle spinning nuclear magnetic resonance spectroscopy,synchrotron X-ray powder diffraction,extended X-ray absorption fine structure spectroscopy,and high-angle annular dark-field scanning transmission electron *** catalytic activity of the confined active species was examined by the carbene-mediated reactions of ethyl-2-diazoacetate to ethyl-2-methoxyacetate as a model *** to the Pd-mordenite and Ni-mordenite,the PdNi-mordenite catalyst incorporates a PdNi cluster,which demonstrates a superior performance,achieving 100%conversion and high selectivity under the same reaction *** study elucidates the potential of constructing bimetallic clusters in zeolites,providing valuable insights for developing new heterogeneous catalysts applicable to a wide range of catalytic processes.

关键词： zeolite metal cluster synchrotron X-ray diffraction carbene-mediated reaction

Three-stage alloying of[Ag_(44)(p-MBA)_(30)]^(4−)cluster with[Au_(2)(p-NTP)_(2)Cl]^(−)

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 2022年第8期15卷 7742-7751页

作者： Baoyu Huang Xiaomei Zhao Yong Pei Department of Chemistry Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationKey Laboratory for Green Organic Synthesis and Application of Hunan ProvinceXiangtan UniversityXiangtan 411105China

Precise control of alloying sites has long been a challenge,yet little has been achieved in the atomic-level manipulation of metallic *** study reported a three-stage metal and motif exchange mechanism of alloying reaction of an atomically precise ligand-protected[Ag_(44)(p-MBA)_(30)]^(4−)(p-MBA=para-mercaptobenzoic acid)cluster with[Au_(2)(p-NTP)_(2)Cl]^(−)(p-MBA=para-mercaptobenzoic acid).During the first stage(Stage I),an exchange of ligand-shell metal atoms took *** the second stage(Stage II),the motif exchanged on the[AuAg_(43)(p-MBA)_(30)]^(4−)*** the third stage(Stage III),the Au(I)atom in the ligand-shell was swapped with a Ag(0)atom of the icosahedral *** density functional theory(DFT)calculation results demonstrated that the metal exchange proceeded via different mechanisms at the different reaction *** reaction Stages I and II,the metal exchange proceeded via formation of a dianionic[Ag_(44)(p-MBA)_(30)]^(4−)-[Au_(2)(p-NTP)_(2)Cl]^(−)intermediate and then broke and recombined with the *** Stage III,the diffusion of the Au(I)to icosahedral Ag12-core(Stage III)was proceeded via a motif catalyzed heterometal atom diffusion *** hope that this work will provide a new perspective for the precise control of alloy position in alloyed nanomaterials.

关键词： metal cluster alloying mechanism density functional theory(DFT)calculations metal exchange

Recent Developments of Dinitrogen Activation on metal Complexes and clusters

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第12期41卷 80-88页

作者： Xue-Lu Ma Meng Li Jun-Bo Lu Cong-Qiao Xu Jun Li School of Chemical&Environmental Engineering China University of Mining&TechnologyBeijing 100083China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China Department of Chemistry and Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of Education Tsinghua UniversityBeijing 100084China

Dinitrogen(N_(2)) is the major component of the atmosphere and many factors bring about dinitrogen inertness with low reactivity. Dinitrogen activation on metal complexes and clusters under ambient condition is the long-standing goal in the modern chemistry. In this review,an attempt has been made to survey the mechanistic aspects of dinitrogen activation and functionalization based on different coordination binding modes of dinitrogen. Our goal is to provide a comprehensive survey of dinitrogen activation in order to guide the relevant research in the future.

关键词： dinitrogen activation binding mode dinitrogen complex metal cluster synergistic mechanism

Mass Spectrometric Studies on metal-hexafluorobenzene Anionic Complexes(M=Ag, Au, Pd, Pt, Pb and Bi)

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2009年第2期25卷 228-233页

作者： SUN Zhang SUN Shu-tao LIU Hong-tao ZHU Qi-he GAO Zhen TANG Zi-chao Beijing National Laboratory for Molecular Sciences（BNLMS） State Key Laboratory of Molecular Reaction Dynamics Center of Molecular Science Institute of Chemistry Chinese Academy of Sciences Beo＇ing 100080 P. R. China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P R. China

The anionic products from the reactions between metal（M=Ag, Au, Pd, Pt, Pb and Bi） vapour produced by laser ablation and hexafluorobenzene seeded in carrier gas（Ar） were studied by means of a homemade reflectron time-of-flight mass spectrometry（RTOF-MS）. Experimental results show that the dominant products were [MmC6F6]^- complexes for the reactions ofAg, Au, Pd and Pt with C6F6, while the dominant products were [MmC6F5]^- complexes for the reactions of Pb and Bi with C6F6. The formation mechanisms of the products, including the adsorption of metal cluster anions on hexafluorobenzene and the C--F cleavage induced by metal cluster anions, were discussed.

关键词： Time-of-flight mass spectrometer metal cluster Anionic complex Reaction mechanism

Construction of novel cluster-based MOF as multifunctional platform for CO_(2) catalytic transformation and dye selective adsorption

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第3期34卷 473-476页

作者： Xiuling Zhang Yongzheng Zhang Wenfeng Zhou Huiling Liu Dashuai Zhang Hui Hu Chao Lv Suijun Liu Longlong Geng College of Chemistry and Chemical Engineering Dezhou UniversityDezhou 253023China School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255000China Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry School of Chemistry and Chemical EngineeringJiangxi University of Science and TechnologyGanzhou 341000China

Synthetic conditions and ligands are the key structural defining factors of metal-organic frameworks(MOFs).Therefore,reasonable optimization of these aspects is considered to be an effective means for designing materials with novel structures and target ***,two novel Co(Ⅱ)-based MOFs,namely[Co(HL)(dibp)]_(n)(HL-8) and{[Co_(2)(L)(OH)(dibp)]·DMA}_n(HL-9)(H_(3)L=2',6'-dimethyl-[1,1'-biphenyl]-3,4',5-tricarboxylic acid;dibp=4,4'-di(1H-imidazol-1-yl)-1,1-biphenyl]),have been hydrothermally synthesized and structurally ***-8 crystallizes in the orthorhombic system (Pna2_(1)) with a grid layer structure,while HL-9 crystallizes in the monoclinic P2_(1)/n space group assembled through Co_(4)(OH)_(2)clusters with organic ***,benefiting from the finite cage-like structure,HL-9 exhibited enhanced performance in carbon dioxide(CO_(2)) adsorption/catalytic transformation and excellent size selectivity during dye molecular adsorption process.

关键词： metal-organic frameworks metal cluster Catalysis CO_(2)cycloaddition Dye separation