检索结果-南通市图书馆

Chinese chemical Letters 2000年第4期11卷 369-372页

作者： Fu Pei LIANG~1 Zi Lu CHEN~1 Rui Xiang HU~1 Hong LIANG~1 Zhao Hui ZHOU~2 (1 department of chemistry. Guangxi Normal university: Guilin 541004 2 department of chemistry. xiamen university. xiamen 361005) Guangxi Normal Univ Dept Chem Guilin 541004 Peoples R China xiamen Univ Dept Chem Xiamen 361005 Peoples R China

Three Complexes of the formula [Cd (4,4'-bpy)_2 (H_2O)_2]_n. (pic)_(2n) (1) [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n(H_2O)_n (pic)-(2n) (2) and [Zn (4,4'-bpy)_2 (H_2O)]_n (4,4'-bpy)_n (pic)-(2n)(H_2O)_n (3) (4.4'-bpy = 4.4'-bipyridine. pic = picric anion ) have been synthesized and characterized by elemental analysis and single-crystal x-ray diffraction. They all have infinite three-dimensional network structure. crystallizing in the monoclinic space group C2/c (1) and Cc (2.3).

关键词： Clathration. 4. 4' - bipyridine. picric anion. three - dimensional network.

Crystal and molecular structure of 2,3-benzo-1,4,7,13-tetraoxa-10-selenacyclopentadeca-2-ene

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of chemistry 1993年第5期11卷 401-405页

作者： XU,Han-Sheng LI,Wei-Ping LIU,Xiu-Fang department of chemistry,Wuhan university,Wuhan 430072HUANG,You-Qing HU,Sheng-Zhi department of chemistry,xiamen university,xiamen 361005 1department of chemistry Wuhan University Wuhan 4300722Department of Chemistry Xiamen University Xiamen 361005

The crystal structure of 2,3-benzo-1,4,7,13-tetraoxa-10-selenacyclopentadeca-2-ene was de- termined,C_(14)H_(20)O_4Se,M_r:331.27,orthorhombic,Pbca,a=18.445(3),b=16.334(4),c9.232(2) ,V=2781.3 ~3,Z=8,Dx=1.582 Mg m^(-3),λ(Mo K_α)=0.71073 ,μ=26.77 cm^(-1),F(000)=1360, T=297 K,R=0.0329,R_w=0.0438 for 2192 reflections with I>3 σ(I).The crystal structure is closely related to that of benzo-15-crown-5(at 123 K),whereas the molecular geometry of the two coronands is different according to their torsion angles calculated and the shapes exhibited.

关键词： Crystal and molecular structure of 2 3-benzo-1 4 7 13-tetraoxa-10-selenacyclopentadeca-2-ene

Ab initio/MBPT Studies of the Effective Exchange Integrals and Theoretical Models of Organic Ferromagnets

在线全文

学校读者我要写书评

暂无评论

chemical Research in Chinese Universities 1991年第3期7卷 181-183页

作者： Li Jiabo (department of chemistry, xiamen university, xiamen)

Nowadays the studies of organize ferromagnets have been becoming a very attractive area of material science in both theoretical and experimental aspects. A major theoretical problem on design of OFM is to estimate the effective exchange integrals(J) between radical sites. However, most of theoretical work was on hypothetical hydrocarbons, which were impracticable in the synthesis. The recent breakthrough in the synthesis of OFM turns the theorist’s attention to some more realistic models such as those

关键词： Organic ferromagnet(OFM) Doping Curie temperature

Adsorption and reduction of palladium (Pd^(2+)) by Bacillus licheniformis R08

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2002年第15期47卷 1262-1266页

作者： LIN Zhongyu, ZHOU Chaohui, WU Jianming, CHENG Hu, LIU Bilan, Nl Zimian, ZHOU Jianzhang & FU JinkunState Key Laboratory for Physical chemistry of Solid Surface, department of chemistry, xiamen university, xiamen 361005, china State Key Laboratory for Physical chemistry of Solid Surface Department of Chemistry Xiamen University Xiamen China

Preliminary study on the mechanism of Pd2+ biosorption by resting cells of Bacillus licheniformis R08 biomass has been carried out by means of chemical kinetics and AAS, TEM, XRD and FTIR methods. The results showed that at 30°C and pH 3.5, when dry R08 biomass powder (800 mg/L) was mixed with Pd2+ (100 mg/L) for 45 min, the rate constant k of biosorption of Pd2+ attained a maximum of 5.97×10-2 min-1 and the half life period of the reaction reached 12 min. The part of Pd2+ adsorbed by R08 biomass was reduced to elemental, cell-bound Pd0 at the same condition. The cell wall of R08 biomass was the primary location for accumulating Pd2+, and aldoses, i. e. hy-drolysate of a part of polysaccharides on the peptidoglycan layer in the acidic medium, serving as the electron donor, in situ reduced the Pd2+ to Pd0.

关键词： Bacillus licheniformis biosorption palladium non-en-zymatically mediated bioreduction FTIR.

Self　Assembled　Monolayer　Films　of　C_（60）　on　O，O＇－Bis（2－aminoethyl）dithiophos　Modified　Copper

在线全文

学校读者我要写书评

暂无评论

Chinese chemical Letters 1996年第12期7卷 1135-1138页

作者： Xiao Yu CHEN Yu HAN Ling QI Zheng XU(Coordinahon chemistry Institute, the State Key Laboratory of Coordination chemistry,Naming university, Nanjing 210093)Lan Sun ZHENG(department of chemistry, xiamen university, Xiaxnen, 361005) Coordination chemistry Institute State Key Lab. of Coord. Chemistry Nanjing University Nanjing 210093 department of Chemistiy Xiamen University Xiamen 361005

On the surface of O,O'-bis(2-aminoethyl) dithiophosphate modified copper C60forms self-assembled monolayer films (SAMs) through the chemical bond. The film was characterized by contact angle, X-ray photoelectron spect... 详细信息

关键词： Films Assembled

STUDIES ON BaF2 PROMOTED PRASEODYMIUM OXIDE CATALYSIS FOR THE OXIDATIVE COUPLING OF METHANE

在线全文

学校读者我要写书评

暂无评论

Journal of Energy chemistry 1997年第2期 85-92页

作者： LONG Rui-Qiang WAN Hui-Lin(department of chemistry and State Key Laboratory for Physical chemistry of the Solid Surface xiamen university xiamen, Fujian 361005)

The catalytic performance for oxidative coupling of methane (OCM) and characterizations of the BaF2 promoted praseodymium oxide catalysts have been studied in this work. The results showed that C2 selectivities and yields over the BaF2 promoted Pr6O11 catalysts were significantly higher than those over Pr6O11 catalyst. In the process of catalyst preparation, the partial exchange between F- and O2- led to the formation of PrOF new phase and the contraction of BaF2 lattice. The increase in C2 selectivity over BaF2 doped Pr6O11 might result from the decrease of specific surface area and mobility of lattice oxygen as well as the dispersion of F- on the surface of the catalysts. No direct relationship between the surface acidity/basicity and the catalytic activity/selectivity was observed over these catalysts.

关键词： methane oxidative coupling praseodymium chide BaF2

Synthesis, Structure and Antitumor Activity of S~*-2-〔2-(Ethyl 4-Methylvalerate〕-1,2-Benzisoselenazol-3(2H)-one

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Structural chemistry 1997年第1期16卷 42-47页

作者： XIAO Ying-Xin LIU Xiu--Fang XU Han--Sheng’(department of chemistry, Wuhan university, Wuhan, 430072)ZHU Jun HUANG You--Qing HU Sheng--Zhi (department of chemistry, xiamen university, xiamen361005) department of chemistry Wuhan University Wuhan 430072 China department of chemistry Xiamen University Xiamen 361005 China

The title compound has been synthesized in good yield in H2O/ethersystem by using 2--chloroselenobenzoyl chloride as the key intermediate. its structurewas characterized by elemental analysisi IR, IH NMR and X--ray diffraction *** data: C15H19NO3Se, M.r= 340. 28, hexagonal, P61, a= 8. 903(2), c= 34. 352(1)A, V=2358. I A3, Z=6, Dx=1. 438 g/cm3, λ(CuKa)=l. 5418 A, μ=33. 56cm--1, F (000) = 1044, final R = 0. 034 for 1396 observed reflections. Molecules incrystal form helieal chains with intermolecular Se...O distance of 2. 812(5) A as wellas intramolecular Se ...O distance of 3. 089 (5) A. Biological studies show that thiscompound is very active against human tumor cells, including HCT--8, Bel--7402,A432, HL--60 and K562.

关键词： benzisoselenazolone ebselen selenoorganic compound synthesis crystal structure antitumor activity

Pictet-Spengler condensation reactions catalyzed by a recyclable H^+-montmorillonite as a heterogeneous BrΦnsted acid

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2010年第3期53卷 561-567页

作者： WANG YuFeng,SONG ZhanBo,CHEN ChunXia & PENG JinSong department of chemistry and chemical engineering,college of Science,Northeast Forestry university,Harbin 150040,china 1. department of chemistry and chemical engineering College of Science Northeast Forestry University Harbin 150040 China

Catalytic performance of different cation-exchanged montmorillonite clays has been investigated in the Pictet-Spengler C-C bond forming reaction.H+-Montmorillonite was found to be a very efficient and reusable catalyst for the endo cyclization of β-phenylethylamine derivatives with aldehydes under solvent-free *** addition,an aqueous condensation version for the synthesis of tetrahydro-β-carbolines using the H+-montmorillonite catalyst has been *** these environmentally friendly processes,the use of organic solvents was avoided and the catalyst was recycled with maintenance of high catalytic activity.

关键词： heterogeneous catalysis catalyst recycling mesoporous materials green synthesis

ASSIGNMENTS FOR THE GROUND STATES OF METAL MONOCARBONYLS

在线全文

学校读者我要写书评

暂无评论

Chinese chemical Letters 1995年第10期6卷 887-890页

作者： Xin XU Nan Qin WANG Xin LU Qian Er ZHANG(State Key Laboratory for Physical chemistry of the Solid Surface,department of chemistry,xiamen university,Fujian 361005) xiamen Univ Dept Chem State Key Lab Phys Chem Solid Surface Xiamen 361005 Peoples R China

The bonding mechanisms between the first-row transition metal and carbon monoxide were discussed. Three basic rules have been drawn up to determine the ground states of the metal monocarbonyls. The theoretical assignm...

关键词：

Raman Spectroscopic Studies on the Complexation and Adsorbed Behaviour of Thiourea

在线全文

学校读者我要写书评

暂无评论

chemical Research in Chinese Universities 1989年第3期5卷 265-269页

作者： Tian Zhongqun (department of chemistry, xiamen university, xiamen)Fleischmann, Martin (department of chemistry, Uneversity of Soutbamptoe, England)

Raman spectroscopic studies on thiourea (TU) in highly acidic media (e. g. >3 mol/L HC1O4) show that TU as a solution species is protonated through its sulphur atom and forms complex with anions. However, as an adsorbed species, TU is protonated via the nitrogen atom and adsorbed at the silver electrode surface through the sulphur atom. The distinct effects of pH and anions of the solution on the surface enhanced Raman (SER) spectra of TU were investigated. In acidic and neutral solutions, TU is coadsorbed with anions through its NH3+ and - NH2 groups respectively.

关键词： Raman spectroscopy Thiourea Adsorption