检索结果-南通市图书馆

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

π-π stacking and Magnetic Coupling Mechanism on a Mono-nuclear Mn(Ⅱ) Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2011年第12期30卷 1751-1757页

作者：陈虎刘利真马艳杜华石敬民 College of Chemistry Chemical Engineering and Materials ScienceKey Laboratory of Molecular and Nano ProbesEngineering Research Center of Pesticide and Medicine Intermediate Clean ProductionMinistry of EducationShandong Provincial Key Laboratory of Clean Production of Fine ChemicalsShandong Normal University School of Pharmacy Shandong University of Traditional Chinese Medicine

A new mono-nuclear Mn（Ⅱ） complex [Mn（MPT）2（NCS）（HOCH3）]ClO4（MPT = 2-methoxyl-1,10-phenanthroline） has been synthesized with 2-methoxyl-1,10-phenanthroline and thiocyanate anion as ligands,and its crystal structure was determined by X-ray *** crystal data：monoclinic system,space group P21/c with a = 12.8849（17）,b = 15.684（2）,c = 14.2703（19） ,β = 92.126（2）°,V = 2881.9（7） 3,Z = 4,C28H24ClMnN5O7S,Mr = 664.97,Dc = 1.533 g/cm3,F（000） = 1364 and μ = 0.679 *** the crystal,MPT functions as a bidentate ligand and Mn（Ⅱ） ion assumes a distorted octahedral *** the crystal there are two types of π-π stacking interactions among the adjacent complexes,which involves 1,10-phenanthroline *** theoretical calculations reveal that the two types of π-π stacking resulted in a weak anti-ferromagnetic coupling with 2J =-14.68 cm-1 and a weak ferromagnetic coupling with 2J = 0.70 cm-1,*** theoretical calculations also reveal that there are both spin polarization and spin delocalization in the two π-π stacking systems,and the magnetic coupling signs are unable to explain with McConnell I spin-polarization mechanism.

关键词： crystal structure magnetic coupling π-π stacking theoretical calculation manganese complex

One-dimensional Supramolecular Chain Based on a Dinuclear Terbium(Ⅲ) 4-Cyanobenzoate Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第7期26卷 805-810页

作者：李国清李艳邹文强陈其湧吴阿清郑发鲲郭国聪 Chemistry and Life Science School Quanzhou Normal University Quanzhou State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences

A new dinuclear Tb（Ⅲ） 4-cyanobenzoate complex [Tb2（4-cba）6（phen）2] （4-Hcba = 4-cyanobenzoic acid and phen = 1,10-phenanthroline） 1 has been synthesized by solvothermal reaction in an ethanol/water mixed solution at 100℃ and structurally characterized by single-crystal X-ray diffraction. Crystallographic data： C72H40N10O12Tb2, Mr=1554.98, triclinic Pi, a = 9.903（3）, b = 11.769（8）, c = 15.078（8）A, a = 111.42（12）, It = 96.37（19）, γ = 101-24（14）°, V= 1572（1）A3, Z= 1, Dc = 1.642 g/cm^3, F（000） = 768 μ = 2.305 mm^-1, the final R = 0.0205 and wR = 0.0543 for 5479 reflections with I 〉 2σ（I）. Structural analysis shows that 1 displays an isolated dinuclear structure. Two eight-coordinated Tb（Ⅲ） ions are bridged by four 4-cba ligands in the syn-syn bidentate coordination mode, and two other 4-cba ligands chelate these two Tb（Ⅲ） ions. The title complex molecules are connected through π-π stacking interactions to generate a one-dimensional supramolecular chain, The characteristic infrared spectra, luminescent properties and thermogravimetric analyses have also been discussed.

关键词： terbium(Ⅲ) complex 4-cyanobenzoic add crystal structure π-π stacking optical spectroscopy

Synthesis and Crystal Structure of catena-Poly[bis-(benzimidazole)cobalt(II) μ-Phthalato]

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第9期24卷 1043-1045页

作者：薛宇虹张骊徐端钧 Department of Chemistry Zhejiang University Hangzhou 310027 China Zhejiang Gongshang University Food and Environment Science College Hangzhou 310012 China

The title polymeric complex [Co（C8H4O4）（C7H6N2）2]n has been prepared and its crystal structure was determined by X-ray diffraction method. The crystal belongs to monoclinic, space group C2/c with a=7.7865（12）, b=20.4215（18）, c=13.4880（14）A°,β=103.298（2）°, V=2087.3（4）A°^3, Mr=459.32, Z=4, Dc=1.462 g/cm^3,μ=0.859 mm^-1, F（000）=940, R=0.0636 and wR=0.1639 for 1278 observed reflections （I〉2σ（I））. The complex assumes a distorted tetrahedral coordination geometry, formed by two phthalate anions and two benzimidazoles （bzim）. The phthalate anions bridge the neighboring Co（Ⅱ） atoms to form the polymeric chains. The centroid distance of 3.471（3）A° between the parallel bzim rings of adjacent polymeric chains suggests the existence of π-π stacking.

关键词： polymeric Co(Ⅱ) complex benzimidazole crystal structure π-π stacking

Synthesis and Crystal Structure of a Coordination Polymer {[Co(phth)(phen)(H_2O)]·(C_2H_5OH)}_n

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第10期25卷 1193-1196页

作者： GAO Ling CHENG Qing-Yan WANG Yan-Ji Hebei University of Technology Tianjin 300130 China

The coordination polymer {[Co（phth）（phen）（H2O）]·（C2H5OH）}n （phth = phthalate, phen = 1,10-phenanthroline） with formula C22H2OCoN2O6 （Mr = 467.33） was synthesized by the solvothermal method under low temperature, and its crystal structure was determined by singlecrystal X-ray diffraction. The complex belongs to monoclinic system, space group P21/n with a = 12.7352（16）, b = 8.8125（11）, c = 18.677（2） °A, β= 102.633（2）°, V = 2045.3（4）°A^3 Z = 4, Dc= 1.518 g/cm^3,μ = 0.882 mm^-1, F（000） = 964, S = 1.053, the final R = 0.0401 and wR = 0.0984 for 3135 observed reflections （I〉 2σ（I））. Single-crystal X-ray analysis revealed that the Co（Ⅱ） ion is six-coordinated. The cobalt complex forms a one-dimensional chain structure via phthalate bridging ligand. In the cobalt complex, a 3D network structure is formed by π-π stacking interaction of 1,10-phenanthroline as well as intermolecular hydrogen bonding interactions.

关键词： cobalt complex solvothermal method π-π stacking hydrogen bond

Synthesis and Crystal Structure of a Co(II) Complex with Schiff Base and Imidazole Ligand

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第5期25卷 567-571页

作者： WU Lian-Bin HU Zi-Qiang LAI Guo-Qiao Key Laboratory of Organosilicon Chemistry and Material Technology of Education Ministry Hangzhou Teachers University Hangzhou 310012 China

The title compound, [Co（C3H4N2）2（C22H18N2O4）]·5H2O （Mr = 659.56）, has been prepared and its crystal structure was determined by X-ray diffraction method. The crystal belongs to monoclinic, space group P21/n, a = 9.6808（2）, b = 26.7204（5）, c = 12.7993（3） A, β = 100.9340（10）°, V= 3250.75（12） A^3, Z = 4, Dc = 1.348 g/cm^3,μ = 0.586 mm^-1, F（000） = 1380, S = 1.131, R = 0.0689 and wR = 0.1883 for 4782 observed reflections （Ⅰ 〉 2σ（Ⅰ））. The title crystal consists of Co（Ⅱ） complex and lattice water molecules. The Co（Ⅱ） complex assumes a distorted octahedral coordination geometry, formed by one Schiff base dianion phenylenediamine-3-methoxysali-cylaldehyde and two imidazole ligands. The π-π stacking interaction occurs between nearly parallel benzene rings of the neighboring complexes.

关键词： cobalt(Ⅱ) complex Schiff base crystal structure π-π stacking

Synthesis and Crystal Structure of [Zn(FcCOO)_2(2,2'-bipy)(H_2O)]_2·H_2O

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2007年第7期26卷 793-796页

作者：胡久荣梁福沛 Department of Chemistry Shangrao Normal College Shangrao College of Chemistry and Chemical Engineering Guangxi Normal University Guilin

A novel complex [Zn（FcCOO）2（2,2＇-bipy）（H2O）]2-H2O （Fc = （η^5-C5H5）Fe（η^5-CsH4）, 2,2＇-bipy = 2,2＇-bipyridine） has been synthesized and characterized by elemental analysis, IR and X-ray diffraction. It crystallizes in monoclinic system, space group P21/c with a = 6.8187（4）, b = 21.7155（13）, c = 19.7411（12） A, a = 90, β = 97.7420（10）, γ = 90°, CtaHssFe4Zn2N4O11, Mr = 1413.28, V = 2896.4（3）A^3, Dc = 1.620 g/cm^3, Z = 2, F（000） = 1444,μ（MoKa） = 1.857 mm^-1, R = 0.0523 and wR = 0.0982 for 3219 observed reflections （I 〉 2σ（I））. Structural analysis shows that the zinc atom is coordinated with three oxygen atoms from two ferrocenemonocarboxylates and one water molecule together with two nitrogen atoms from 2,2＇-bipyridine, giving a distorted square-pyramidal coordination geometry. The complex molecules are linked to form an infinite one-dimensional chain by both intermolecular hydrogen bonds and π-π stacking interactions of the bipyridine rings.

关键词： zinc(Ⅱ) complex crystal structure ferrocenemonocarboxylic acid π-π stacking

Synthesis and Gelation Capability of Fmoc and Boc Mono-substituted Cyclo（L-Lys-L-Lys）s

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2016年第3期32卷 484-492页

作者： ZONG Qianying GENG Huimin YE Lin ZHANG Aiying SHAO Ziqiang FENG Zengguo School of Materials Science and Engineering Beijing Institute of Technology Beij'ing 100081 P. R. China Beijing Engineering Research Center of Cellulose and Its Derivatives Beijing 100081 P. R. China

Fmoc or Boc mono-substituted cyclo（L-Lys-L-Lys）s were synthesized via the reaction of lysine cyclic dipeptide with Fmoc N-hydroxysuccinimide este（Fmoc-OSu） and di-tert-butyl dicarbonate[（Boc）20], respectively. The resulted mono-substituted cyclo（L-Lys-L-Lys）s（2-4） by means of test tube inversion method served as organogelators enabled to form stable thermo-reversible organogels in alcoholic, substituted benzene and chlorinated solvents, with the minimum gelation concentration（MGC） in a range of 1%-4%（mass fraction）. The transmission electron microscopy（TEM） and scanning electron microscopy（SEM） observations reveal that these gelators self-assembled into 3D nanofiber, nanoribbon or nanotube network structures. The rheological measurement exhibited that the sto- rage modulus of gels is higher than the loss one, and the complex viscosity is reduced linearly with the increasing of scanning frequency. The fluorescence spectrum of compound 2 in 1,2-dichloroethane and benzene demonstrates that the emission peak of Fmoc at 320 nm has red-shifted and the intensity decreases gradually, while the intensity of the emission peak at 460 nm substantially enhances as a function of concentration, indicating the existence of π-π stacking interactions and the formation of J-type aggregates. Meanwhile, compound 4 self-assembled into nanotubes via the stacking of multiple bilayer membranes. Fmoc and Boc disubstituted cyclo（L-Lys-L-Lys）（3） holds the relatively lower MGC values, showing the stronger gelation ability in most selected organic solvents due to the presence of both Fmoc and Boc groups.

关键词： Lysine cyclic dipeptide Low molecular weight gelator π-π stacking Nanotube

（4-Ferrocenylethyne） phenylamine on Graphene as the Signal Amplificator to Determinate Dopamine and Acetaminophen Simultaneously

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

Chinese Journal of Chemistry 2013年第6期31卷 845-854页

作者： Linping Wang Meiling Liu Yue Meng Haitao Li Youyu Zhang Shouzhuo Yao Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education) College of Chemistry and Chemical Engineering Hunan Normal University Changsha Hunan 410081 China

A novel （4-ferrocenylethyne） phenylamine functionalized graphene sheets （FEPA-GR）, coupling with chitosan （CS） were used as a signal amplification platform for simultaneous and sensitive determination of dopamine （DA） and acetaminophen （AC）. In this work, FEPA used as electron transfer mediator can be immobilized on GR surface via strong π-π stacking interaction between the conjugate chain of FEPA and GR, which effectively prevents FEPA electron mediator leaking from the electrode surface and amplified the signal. Transmission electron microscopy, FT-IR spectroscopy, UV-vis spectroscopy and electrochemical experiments results are all demonstrated the strong π-π stacking interaction between FEPA and GR. The resulted biosensor exhibited a fast response, remarkable electrocatalytic activity, perfect anti-interference ability and good stability for simultaneous detection of DA and AC. Under the optimum conditions, the oxidation peak currents of DA and AC were linearly correlated to their concentrations in the range of 2.0-135.0 μmol·L-1 and 0.3--80.0μmol·L 1, respectively. The lower detection limits for DA and AC were 0.30 and 0.05 μmol·L-1, respectively. The feasibility of the proposed method was validated by successfully applied to the simultaneous determination of DA and AC in serum samples with the standard addition method.

关键词： simultaneous electrochemical detection (4-ferrocenylethyne) phenylamine π-π stacking