检索结果-南通市图书馆

Regioselective aminohalogenation of β-nitrostyrenes using NCS and NBS as nitrogen/halogen sources

在线全文

学校读者我要写书评

暂无评论

Science China chemistry 2010年第1期53卷 140-146页

作者： ZHI SanJun1,2.SUN Hao2.LIN Chen2.ZHANG GuangQian2.LI GuiGen4 & PAN Yi2.3 1 Department of chemistry,Huaiyin Normal university,Huai’an 2.1003,China 2.School of chemistry and Chemical Engineering,nanjing university,nanjing 2.0093,China 3 state key lab of coordination chemistry,nanjing university,nanjing 2.0093,China 4 Department of chemistry and Biochemistry,Texas Tech university,Lubbock,Texas 79409-1061,USA 1. Department of chemistry Huaiyin Normal University Huai’an 221003 China2. School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China4. Department of Chemistry and Biochemistry Texas Tech University Lubbock Texas 79409-1061 USA3. State Key Lab of Coordination Chemistry Nanjing University Nanjing 210093 China

Aminohalogenation reaction of β-nitrostyrenes with N-halosuccinimides(N-chloro and N-bromosuccinimides) has been successfully conducted by using nickel acetate as a catalyst in the presence of potassium carbonate and succinimide as *** reaction was easily performed at room temperature under nitrogen gas protection to give dihalorinaed haloamino products in good to excellent yields(60%-98%).The structure has been confirmed by X-ray crystal structure analysis.

关键词： aminohalogenation vicinal haloamines β-nitrostyrenes NBS NCS

Crystal structure and single crystal EPR of (NH_4)_2.15-crown-5)_3[Cu(mnt)_2. and (NH_4)_2.benzo-15-crown-5)_4[Cu(mnt)_2.·0.5H_2.

在线全文

学校读者我要写书评

暂无评论

Science China chemistry 2007年第5期50卷 607-613页

作者： SUI YunXia1, WEN LiLi2. ZHANG Huan3 & MENG QingJin2.1 Center of Modern Analysis, nanjing university, nanjing 2.0093, China 2.{2. key laboratory of coordination chemistry, coordination chemistry Institute, nanjing university, nanjing 2.0093, China 3 Jiangnan Institute of Computing Technology, Wuxi 2.4083, China 1. Center of Modern Analysis Nanjing University Nanjing 210093 China 2. state key {2.oratory of coordination {2. Coordination Chemistry Institute Nanjing University Nanjing 210093 China 3. Jiangnan Institute of Computing Technology Wuxi 214083 China

The X-ray crystal structures of (NH4)2.15-crown-5)3[Cu(mnt)2. (1) and(NH4)2.benzo-15-crown-5)4-[Cu(mnt)2. ident to 0.5H2. (2. were *** single crystals arecomposed of distinct structures of ammonium-crown ether supramolecular cation and [Cu(mnt)2.^(2.)*** triple-decker dication in complex 1 and a sandwich dimmer in complex 2.wereobserved.X-Band EPR studies on the single crystals of both complex 1 and complex 2.have been carriedout at room temperature,which revealed that complex 2.showed a perfect hyperfine structure of Cuwhereas that of complex 1 could not be *** principal values and direction cosines of theprincipal axes of the g and A tensors were computed by a least-squares fitting *** spindensity of Cu(ll) was estimated according to the principal values of the A tensors and compared wellwith the results calculated based on DFT method.

关键词： supramolecular cation, H-bonding interaction, EPR, g and A tensors, DFT

One-dimensional metal phosphonates based on 6-phosphononicotinic acid:A structural and magnetic study

在线全文

学校读者我要写书评

暂无评论

Science China chemistry 2010年第10期53卷 2112-2117页

作者： WANG PengFei, DUAN Yan & ZHENG LiMin state key {2.oratory of coordination {2. coordination {2. Institute, School of {2. and Chemical Engineering, nanjing university, nanjing 2.0093, China 1. state key {2.oratory of coordination {2. coordination chemistry Institute School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

The reactions of 6-phosphononicotinic acid (pnaH3) and metal salts result in three new compounds, namely, M(pnaH)-(H2.)3·H2. [M = Co(Ⅱ) (1), Ni(Ⅱ) (2., Zn(Ⅱ) (3)]. These compounds are isostructural and contain 2. helical chains made up of corner-sharing {MO5N} octahedra and {PO3C} tetrahedra. The chains are further connected by extensive hydrogen bonds to form a three-dimensional supramolecular structure. Magnetic studies reveal that dominant antiferromagnetic interactions are mediated in both 1 and 2. Interestingly the dehydrated compound 1 shows metamagnetic behavior at low temperature.

关键词： carboxylate-phosphonate coordination polymer magnetic property metamagnetism

Syntheses,crystal structures and properties of three novel coordination polymers with tripodal imidazole-containing ligands and benzenetetracarboxylate

在线全文

学校读者我要写书评

暂无评论

Science China chemistry 2010年第10期53卷 2164-2169页

作者： SU Zhi, FAN Jian & SUN WeiYin state key {2.oratory of coordination {2. nanjing National {2.oratory of Microstructures coordination {2. Institute, School of {2. and Chemical Engineering, nanjing university, nanjing 2.0093, China 1. state key {2.oratory of coordination {2. nanjing National laboratory of Microstructures coordination chemistry Institute School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

Three novel coordination polymers, [Ni2.tib)2.btec)]·2.2. (1), [Co2.tib)2.btec)]·2.2. (2. and [Zn4(tib)2.btec)Cl4]·2.2. (3), have been synthesized by using mixed ligands of 1,3,5-tris(1-imidazolyl)benzene (tib) and 1,2.4,5-benzenetetracarboxylic acid (H4btec) under hydrothermal conditions. Complexes 1 and 2.have the same structure and are rare three-dimensional (3D) self-penetrating (3,4,5)-connected nets, while complex 3 is an unprecedented (3,4)-connected 3D net. The different structures of 1 (2. and 3 are ascribed to the distinct coordination geometry of the metal centers. The thermal stability and photoluminescence property of the complexes were investigated.

关键词： coordination polymer self-penetration crystal structure thermal stability photoluminescence property

IMPEDANCE CHARACTERISTICS OF POLYFURAN FILMS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2002年第5期20卷 419-423页

作者： Liang Li Xiao-bo Wan Gi Xue Department of Polymer the state key {2.oratory of coordination {2. nanjing university nanjing 2.0093. China nanjing Univ Dept Polymer State Key Lab Coordinat Chem Nanjing 210093 Peoples R China

Electrochemical impedance spectroscopy (EIS) was first used for the characterization of polyfuran (PFu) films that had been formed electrochemically on an Au electrode. The polyfuran was measured in high oxidation state, intermediate oxidation state and reduction state, respectively. As the oxidation level is increased, the ionic conductivity of PFu/BF4- increases. And impedance studies on PFu show that the anion BF4- appears to be mobile with a high diffusion coefficient of approximately 10(-8) cm(2..s(-1).

关键词： polyfuran electrochemical impedance spectroscopy capacitance

Anion Adsorption on an Au Colloid Monolayer Based Cysteamine-Modified Gold Electrode

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2001年第2期17卷 159-167页

作者： HU Xiao-ya, XIAO Yi and CHEN Hong-yuan (Department of chemistry, The state {2. laboratory of {2. chemistry, nanjing university, nanjing 2.0093, P. R. China) nanjing Univ Dept Chem State Key Lab Coordinat Chem Nanjing 210093 Peoples R China

Anion adsorption behavior on Au colloid surface was investigated in virture of depositing monolayers of Au colloid on the self-assembled monolayers of cysteamine on a gold electrode. Po- tential-dependent anion adsorption-desorption waves via the nonfaradaic current were obtained by means of cyclic voltammetry at Au coltoid-modified gold electrodes in the potential range of -2.00-600 mV. The adsorption sequence in the order of adsorption peak potentials (Epa) is OH- >citrate3 ->H2.O4- >Cl->SO42.>ClO4->NO3-. Among them, citrate3- exhibited an en- tirely irreversible adsorption. A rise in temperature can increase the rates of adsorption-desorp- tion and improve the reversibility of the adsorption-desorption of Cl-, SO42., ClO4-, NO3- and H2.O-4. The adsorption peak potentials shifted more negatively for Ca. 63 mV as the anion con- centrations were increased by a decade factor. The change of pH from 7 to 1 slightly affected the adsorption peak potentials of Cl- and NO3-. Au colloids with a smaller size (16 nm) gave rise to a better reversibility of the adsorption-desorption process and lower adsorption currents. The ex- perimental results of citrate ions adsorption on Au colloid surface show that Au colloids with a smaller size prepared by sodium citrate method exhibited a higher stability in the solution in com- parison to those with larger sizes because of its higher ratio of charge/mass. In other words, the smaller gold nanoparticles are covered with citrate ions monolayer that can also be formed at larg- er gold nanoparticles by means of electrochemical scan.

关键词： Colloidal gold Self-assembled monolayer Gold electrode Electrode dynamics

A New Thionine Modified Electrode by Anchorage to Bi-(2.aminoethyl)-aminodithiocarboxyl Acid Self-assembled Monolayers through coordination with Cu^(2.#)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第11期8卷 993-996页

作者： Jing Juan XU Hong Yuan CHEN Rui Qun FANG (Department of chemistry, the state {2. laboratory of {2. chemistry, nanjing university, nanjing, 2.0093) Department of chemistry State Key Lab. of Coord. Chemistry Nanjing University Nanjing 210093 China

A new method for preparing chemically modified gold electrode by anchoring thionine to self-assembled bi - (2.-aminoethyl) -aminodithiocarboxyl acid(BANTC) monolayers through coordination with Cu2. is described. This thionine modified electrode exhibits two-new redox *** protons were involved in the electrochemical process undergone by the couple I in the pH range of 5.0-10.0. The apparent surface electron transfer rate constant is about 0.050s-1.

关键词： aminodithiocarboxyl Acid Self-assembled Monolayers through coordination with Cu A New Thionine Modified Electrode by Anchorage to Bi aminoethyl

Study on the inclusion compound of β-cyclodextrin with (η5-cyclopentadienyl)tricarbonylmanganese(0)

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of chemistry 1995年第4期13卷 311-317页

作者： SONG, Le-Xin MENG, Qing-Jin YOU, Xiao-Zengcoordination chemistry {2. key laboratory, coordination chemistry Institute, nanjing university,nanjing, Jiangsu 2.0093, China coordination chemistry {2. key laboratory Coordination Chemistry Institute Nanjing University Nanjing Jiangsu 210093 China

The supramolecular inclusion compound of β-cyclodextrin (β-CD, host) with (η5-cyclopentadienyl)tricarbonylmanganese [MnCp(CO)3, guest] was obtained in a crystalline state. The host-guest compound is thermally stable and do not liberate the guest on heating at 100$ in vacuum. It was characteried by elemental analysis,1H NMR, differential scanning thermal (DSC) analysis and TLC. Continueous variation plot by NMR method shows that β-CD formed 1:1 inclusion compound with MnCp(CO)3. On the basis of 1H NMR spectra and the model building with Corey Pauling Koltum (CPK) models, the most probable inclusion mode is proposed.

关键词： Inclusion compound β-cyclodextrin supermolecule

β-Cyclodextrin Facilitates the Cleavage of Cobalt-Carbon Bonds during the Electrochemical Reduction of Alkylaquabis(dimethylglyoximato)Cobalt(Ⅲ)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第9期8卷 801-802页

作者： Ying CHEN Lai Bin LUO Hui Lan CHEN Shi Min ZHU(Department of chemistry, coordination chemistry Institute and coordination chemistry state key laboratory, nanjing university, nanjing, 2.0093) nanjing UNIV STATE KEY LAB COORDINAT CHEMNANJING 210093PEOPLES R CHINA nanjing UNIV DEPT CHEMINST COORDINAT CHEMNANJING 210093PEOPLES R CHINA

The electrochemical reduction of alkylaquabis (dimethylglyoximato)Cobalt(Ⅲ) in the absence and presence of β-Cyclodextrin (β-CD) was inveingated by means of cylic voltammetry. It was found that β-CD facilitates th... 详细信息

关键词： Cyclodextrin Facilitates the Cleavage of Cobalt-Carbon Bonds during the Electrochemical Reduction of Alkylaquabis dimethylglyoximato)Cobalt