检索结果-南通市图书馆

Hydrothermal Synthesis, Structural Characterization and Properties of Mixed Valent Decavanadium Oxide [Co_2Cl_8V_(10) O_(18)(H_2O)]Cl_2·6H_2O with Novel Three-dimensional Framework

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2003年第2期19卷 135-139页

作者： WU Ping song XU Lin WANG En bo hu chang wen Faculty of Chemistry Northeast Normal UniversityChangchun 130024P.R.China

Decavanadium oxide [Co 2Cl 8V 10 O 18 (H 2O)]Cl 2·6H 2O was synthesized hydrothermally with NH 4VO 3, Na 2MoO 4·2H 2O, H 3PO 4(85%), CoCl 2·6H 2O and hexamethylenetetraamine. The X ray diffraction analysis showed that [Co 2Cl 8V 10 O 18 (H 2O)]Cl 2·6H 2O crystallized in a monoclinic crystal system, the space group was C2/m with cell parameters a =1 6065(3) nm, b =2 2699(5) nm, c =1 3897(3) nm, β = 125.29(3)°, V =4 1363(14) nm 3, Z =2 and the final R =0 06, wR =0 1926. Its crystal structure is a 3 D open framework constructed by VO x polyhedra and CoCl 4 tetrahedra with channels along the crystallographic axes a, b, and c .

关键词： Hydrothermal synthesis Polyoxometalate Crystal structure

Synthesis and Crystal Structure of a New Three-dimensional Supramolecule of Copper(Ⅱ) Schiff Base Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2008年第2期27卷 187-190页

作者： LI Chun-Hong WANG Qiang XU Yan-Qing hu chang-wen Institute for Chemical Physics and Department of Chemistry Beijing Institute of Technology Beijing 100081 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology BeOing 100081 China

A new three-dimensional supramolecule composed of copper-Schiff base complex, [Cu（naphdien）]Cl·H2O, where naphdien is Schiff base of 2-hydroxy-1-naphthaldehyde and diethylenetriamine, has been synthesized and determined by single-crystal X-ray diffraction. It belongs to the monoclinic system, space group P21/c, with a = 7.3490（15）, b = 7.0847（16）, c = 30.845（3）A, β= 95.33（3）°, V = 1599.0（5）A3, Z = 4, C15 H20ClCuN3O2, Mr = 373.33, De = 1.551 g/cm3, μ = 1.543 mm^-1, F（000） = 772, R = 0.0536 and wR = 0.0927 for 2788 unique reflections with 1659 observed ones （I 〉2σ（I））. In the crystal structure, mononuclear units [Cu（naphdien）]Cl·H2O are linked into a two-dimensional framework via strong hydrogen bonds, and extended into a three-dimensional supramolecular structure through π-π stacking interactions.

关键词： copper crystal structure Schiff base hydrogen bonds

Synthesis, Structure Characterization and Biological Activity of a Novel Amino Acid Salt (HAla)_8(H_30)_(10)[PMo_(12)O_(40)]_6·22H_2O

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4期17卷 356-361页

作者： HAN Zheng-bo WANG En-bo LUAN Guo-you hu chang-wen chang Ya-ping LI Juan hu Ning-hai JIA Heng-qing Faculty of Chemistry Northeast Normal UniversityChangchun 130024P.R.China College of Medicine Jilin UniversityChangchun 130021P.R.China changchun Institude of Applied Chemistry Chinese Academy of Sciences.Changchun 130022P.R.China

A novel compound was synthesized and characterized by means of elemental analysis, IR and UV spectra, TG, CV and single crystal X-ray diffraction. The compound crystallized in an orthorhombic space group C222 with a = 1. 622 4(3) nm, b=3. 498 4(7) nm, c=l. 301 5(3) nm,V=7. 387(3) nm3, Z = 6, R1 = 0. 037 3, wR2 = 0. 114 0. The Ala (Ala = alanine) molecules were protonated at the amino nitrogen N (1) and the C (2) of Ala group with the terminal oxygen atom O(15), O(14), O(26) and O(27) of the polyoxometalates participating in the hydrogen bond network. The anti-tumor activity of the title compound was estimated against Hela and Pc-3m cancer cells.

关键词： Polyoxometalate Ala Crystal structure Antitumor activity

3D Supramolecular Network Based on Hydrogen Bonds Between 1D [Ni(μ_2-C_2O_4)(Him)_2] Zigzag Chains

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2007年第4期23卷 483-485页

作者： ZHANG Jing huANG Ru-dan Zhu Oin-lei hu chang-wen Department of Chemistry School of Science Bering Institute of Technology Bering 100081 P. R. China

In recent years, considerable attention has been paid to supramolecular networks based on metal organic building blocks because of their potential applications in diverse fields, such as, catalysis, optics, sensors, magnetism, and molecular recognition^[1-3]. On the ba- sis of the principles of crystal engineering and special synthesis strategies, several novel supramolecular frameworks have been assembled from various organic, inorganic and metal-organic moieties, which largely en- riches the structure chemistry of solid state materi-als^[4-9].

关键词： Hydro/solvothermal reaction Supramolecular framework Hydrogen bond Crystal structure

Low Melting Point and High Stability Polyoxomolybdate-based Ionic Liquids as Photocatalysts

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第1期27卷 11-14页

作者： DONG Tao CHEN Fa-wang CAO Min-hua hu chang-wen Department of Chemistry Institute for Chemical Physics Beijing Institute of Technology Beijing 100081 P. R. China School of Material Engineering Jinling Institute of Technology Nanjing 211169 P. R. China

The polyoxometalate-imidazole ionic liquids（POM-ILs） with low melting points at 94.5 and 95.5 ℃, [Cn mim]a[MosO26]（Cn mim=1-alkyl-3-methylimidazolium, n=12,14）, have been successfully synthesized and characterized by DSC, single-crystal X-ray diffraction and TGA, etc. The two POM-ILs have relatively high stability with decomposing temperature up to about 347 and 344 ℃, respectively. Further photocatalytic performance was measured via the degradation of rhodamine B（RB） in aqueous solution. The experiments show that the conversion reached to 90% after 90 min under UV-light and the degradation efficiency depended on pH value, different dosages and so on. In addition, the catalysts can be recycled for several times without significant loss of activity.

关键词： Polyoxometalate Ionic liquid 1-Alkyl-3-methylimidazolium Photocatalytic activity

Preparation, Structure and Properties of 3D Supramolecular Architecture, on the Basis of Hydrogen Bonds and π-π Stacking Between 2D Layers, with Windmill Building Blocks

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第3期24卷 251-254页

作者： YU Li-qiong huANG Ru-dan CHI Ying-nan hu chang-wen Department of Chemistry Beijing Institute of Technology Beijing 100081 P R. China

A novel three-dimensional（3D） supramolecular architecture, {[Nd（OH-BDC）（OH-HBDC）（H2O）2]·2HaO）n（1）（OH-H2BDC=5-hydroxyisophthalic acid）, which was formed through hydrogen bonds and π-π stacking between two-dimensional（2D） layers, was hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Windmill building blocks, which consist of two nine-coordinated metal centers and four OH-H2BDC groups are connected through two carboxyl groups, to lead to a one-dimensional infinite inorganic chain（… M--O--C--O--M…） along the [100] direction. An observed intense blue luminescence with an emission band peaked at 390 nm for compound 1 may results from ligand-to-metal charge transfer（LMCT）. Variable-temperature magnetic susceptibility of compound 1 was investigated and the value was deviated from the Curie-Weiss law.

关键词： Building block π-π stacking Hydrogen bond Luminescence Magnetism

1-Methyl-3-octylimidazolium Polyoxomolybdate Ionic Liquid with Low Melting Point and High Stability:Preparation and Photocatalytic Activity

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2011年第2期27卷 177-180页

作者： DONG Tao XU Yan-qing CHEN Fa-wang CHI Ying-nan hu chang-wen State Key Laboratory of Explosion Science and Technology Department of ChemistryInstitute for Chemical Physics Beo＇ing Institute of Technology Beijing 100081 P R. China

The polyoxometalate（POM）-imidazole ionic liquid（IL） [C8mim]2[Mo6O19]（C8mim=1-methyl-3-octylimi- dazolium） with a low melting point of 82.6 °C was successfully prepared and characterized by FTIR, XPS, NMR, TG and so on. The polyoxomolybdate-based IL has high stability, and its decomposing temperature reaches 321 °C, which is higher than that of 1-alkyl-3-methylimidazolium halides IL. Further photocatalytic performances of the IL were measured via degrading dye rhodamine B（RB） in aqueous solution under the UV light irradiation. The experiments show that the conversion of RB reaches 80.5% after 90 min under UV-light and the degradation efficiency depends on the pH value of the solution, irradiation time and the dosage of the IL and so on.

关键词： Ionic liquid Polyoxomolybdate Low melting point High stability Photocatalytic activity

Synthesis of Mg_5(CO_3)_4(OH)_2·4H_2O with Flower-like Micro-structure and Its Catalytic Activity for Transesterification of Dimethyl Carbonate with Phenol

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2007年第6期23卷 641-645页

作者： WANG Qiang WANG Ke-li WU Xing-long LUO Sheng-jun hu chang-wen The Institute for Chemical Physics Department of Chemistry State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 P. R. China Biological Engineering Department Jilin Vocational Technology College in Agriculture Engineering C ongzhuling 136100 P. R. China

A novel flower-like hydrated magnesium carbonate hydroxide, Mg5 （CO3 ）4 （OH）2·4H2O, with micro-structure composed of individual thin nano-sheets was synthesized using a facile solution route without the use of template or organic surfactant. Reaction time has an important effect on the final morphology of the product. The micro-structure and morphology of Mg5 （CO3）4 （OH）2·4H2O were characterized by means of X-ray diffractometry （XRD）, fieldemission scanning electron microscopy（FE-SEM）. Brunauer-Emmett-Teller（BET） surface areas of the samples were also measured. The probable formation mechanism of flower-like micro-structure was discussed. It was found that Mg5 （CO3）4（ OH）2·4H2O with flower-like micro-structure was a novel and efficient catalyst for the synthesis of diphenyl carbonate （DPC） by transesterification of dimethyl carbonate （DMC） with phenol.

关键词： Mg5(CO3)4(OH)2 ·4H2O Flower-like micro-structure Catalytic property Transesterification Diphenyl carbonate

A Solvothermal Route to Cu_2O Nanocubes and Cu Nanoparticles

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2006年第5期22卷 547-551页

作者： TANG Xin-ling REN Ling SUN Ling-na TIAN Wei-guo CAO Min-hua hu chang-wen The Institute for Chemical Physics and Department of Chemistry Beijing Institute of Technology Beijing 100081 P. R. China Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China

Cu2O nanocubes and Cu nanoparticles were prepared by reducing Cu（ Ⅱ ） salt with ethanol as the reducing agent and solvent in the presence of multidentate ligand poly（vinylpyrrolidone）（PVP） under different conditions. The morphologies and the crystalline structures of the products were characterized by using scanning electron microscopy （SEM）, transmission electron microscopy（TEM）, selected-area electron diffraction（ SAED）, and powder X-ray diffraction（XRD）. In particular, the influences of the solvothennal reaction temperature and alkalinity on the products were investigated. A lower temperature and a lower alkali concentration favor the formation of the Cu2O phase, whereas a higher temperature and a higher alkali concentration generally lead to the formation of the Cu phase.

关键词： Cu2O nanocube Cu nanoparticle Ethanol Poly(vinylpyrrolidone) Selective synthesis