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

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

作者： WANG PengFei, DUAN Yan & ZHENG LiMin state key laboratory of coordination chemistry coordination chemistry institute, School of chemistry and Chemical Engineering, nanjing university, nanjing 2.0093, china state key laboratory of coordination chemistry coordination chemistry institute School of Chemistry and Chemical Engineering Nanjing University Nanjing China

The reactions of 6-phosphononicotinic acid (pnaH3) and metal salts result in three new compounds, namely, M(pnaH)-(H2O)3·H2O [M = Co(Ⅱ) (1), Ni(Ⅱ) (2), Zn(Ⅱ) (3)]. These compounds are isostructural and contain 21 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

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

作者： SU Zhi, FAN Jian & SUN WeiYin state key laboratory of coordination chemistry nanjing National laboratory of Microstructures coordination chemistry institute, School of chemistry and Chemical Engineering, nanjing university, nanjing 2.0093, china state key laboratory of coordination chemistry nanjing National laboratory of Microstructures coordination chemistry institute School of Chemistry and Chemical Engineering Nanjing University Nanjing China

Three novel coordination polymers, [Ni2(tib)2(btec)]·2H2O (1), [Co2(tib)2(btec)]·2H2O (2) and [Zn4(tib)2(btec)Cl4]·2H2O (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

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

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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 state key laboratory, coordination chemistry institute, nanjing university,nanjing, Jiangsu 2.0093, china coordination chemistry state 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)

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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) Coord. Chem. state key laboratory Coordination Chemistry Institute Nanjing University Nanjing 210093 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

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_2O

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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 state key laboratory of coordination chemistry, coordination chemistry institute, nanjing university, nanjing 2.0093, china 3 Jiangnan institute of Computing Technology, Wuxi 214083, china Center of Modern Analysis Nanjing University Nanjing China state key laboratory of coordination chemistry Coordination Chemistry Institute Nanjing University Nanjing China Jiangnan institute of Computing Technology Wuxi 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 0.5H2O (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

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

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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 key laboratory of coordination chemistry, nanjing university, nanjing 2.0093, P. R. china) 南京大学配位化学国家重点实验室江苏南京 210093

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 ->H2PO4- >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 H2PO-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

Solid state synthesis and nonlinear optical properties of MoS_4Ag_2 (PPh_3)_33 and MoS_4Cu_2Ag (PPh_3)_3 Br

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Chinese Science Bulletin 1997年第14期42卷 1184-1189页

作者： LONG Deliang, SHI Shu, MEI Yuhua and XIN XinquanDepartment of chemistry, state key laboratory of coordination chemistry, nanjing university, nanjing 2.0093, china Department of chemistry State Key Laboratory of Coordination Chemistry Nanjing University Nanjing China

IN recent years, there has been considerable interest in the research of nonlinear optical(NLO) materials. The researches were mainly focused on semiconductors, polymers and dis-crete organic molecules. In contrast, inorganic clusters, a very promising group of com-pounds, have received little attention. It was demonstrated in our previous works thatMo(W)-Cu(Ag)-S cluster compounds exhibit strong third-order nonlinear optical properties.

关键词： cluster compound solid state synthesis nonlinear optical property-

IMPEDANCE CHARACTERISTICS OF POLYFURAN FILMS

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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 laboratory of coordination chemistry nanjing university nanjing 2.0093. china Department of Polymer Nanjing University the State Key Laboratory of Coordination Chemistry Nanjing 210093

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

Two bimetallic W(Ⅳ)-Mn(Ⅱ) complexes based on octacyanometallates:structures and magnetic properties

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Science china chemistry 2009年第11期52卷 1801-1807页

作者： LIU BaoLin,XIAO HongPing,SONG You & YOU XiaoZeng state key laboratory of coordination chemistry,nanjing National laboratory of Microstructures,School of chemistry and Chemical Engineering,nanjing university,nanjing 2.0093,china state key laboratory of coordination chemistry Nanjing National Laboratory of Microstructures School of Chemistry and Chemical Engineering Nanjing University Nanjing China

Two cyano-bridged heterobimetallic coordination polymers,[{Mn(dpa)2}2W(CN)8·CH3CN·4H2O]n(1)(dpa = 2,2'-dipyridylamine) and [Mn2(H2O)4{W(CN)8}·3H2O]n(2),have been synthesized and characterized structurally and magnetically.X-ray analysis shows that complex 1 is a one-dimensional(1-D) polymer of W2(CN)4Mn2 square units in which adjacent square fragments are interlinked by sharing [W(CN)8]4-moieties to form an infinite *** 2 is a three-dimensional(3-D) polymer,which shows an unforeseen structure,exhibiting a 3-D open network with a 1-D channel(ca.13.21  × 11.82 ).Fitting of the magnetic properties indicates that both polymers exhibit weakly antiferromagnetic interactions between the adjacent Mn ions.

关键词： cyano-bridged coordination polymer magnetic property manganese(Ⅱ) complex