检索结果-南通市图书馆

Fluorescence determination of platinum with dibromohydroxyphenyl-fluorone in microemulsion after separation and enrichment by sulfhydryl dextrose gel

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2008年第1期27卷 101-105页

作者： LI Huizhi ZHAI Yubo ZHAI Diantang school of chemistry and chemical engineering Jinan University Jinan 250022 China school of life science Nanjing University Nanjing 210093 China

A new fluorescence quenching method has been developed for the determination of platinum in nonionic microemulsion *** method is based on the fact that platinum can form a stable chelate with dibromohydroxyphenyl-fluorine（DBHPF） when they are in the molar ratio of 1：2 in the nonionic microemulsion *** optimum conditions,the system,having the maximum excitation and emission wavelengths at 468 nm and 532 nm,respectively,shows constant fluorescence intensity in the pH range of 3.5-4.0 and high selectivity and sensitivity as well as low interference from foreign ***,this fluorescence intensity is a linear function of Pt（IV） concentration in the range of 0.002-1.00 μg·mL^-1 and the limit of detection is 2.90 ng·mL^-1.

关键词： analytical chemistry separation and enrichment fluorescence determination microemulsion platinum(IV)

A study on methane coupling to acetylene under the microwave plasma

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 231-237页

作者： SHEN ChangSheng1,SUN YongZhi1,SUN DeKun2 & YANG HongSheng1 1State Key laboratory of Millimeter Waves school of Electronic science and engineering,Southeast university,nanjing 210096,china 2school of chemistry and chemical engineering,nanjing university,nanjing 210093,china State Key laboratory of Millimeter Waves school of Electronic science and engineering Southeast University Nanjing China school of chemistry and chemical engineering Nanjing University Nanjing China

By optimizing the microwave chemistry reactor made of the rectangular waveguide resonator,the methane conversion(the maximum 93.7%),the C2 hydrocarbon yield(the maximum 91.0%) and the acetylene yield(the maximum 88.6%) were all greatly increased under the microwave ***,for the optimal reactor,the change of the methane conversion and the C2 hydrocarbon yield is little within the range of the pressures in the *** C2 hydrocarbon is mainly made up of acetylene,and the selectivity for acetylene is above 90%.Energy yield and space time yield of acetylene are also *** emission spectroscopy(OES) was adopted for the diagnosis of methane coupling to acetylene under microwave *** excited species(CH,C2,H2,Hα) were detected in the spectra range of 300-750 *** on the products and the excited species,the reaction mechanism of methane coupling under microwave plasma was investigated,using the thermodynamics and kinetics of the chemical reaction.

关键词： microwave plasma methane acetylene

Meet Our New Editorial Board Members of Spotlights

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of chemistry 2024年第16期42卷 1932-1936页

作者： Editorial Office of Chinese Journal of chemistry 不详

Editorial Board Member of *** ***,College of Materials science and engineering Beijing university of chemical ***:2006-2010,B.S.,Materials science and engineering,Beijing university of chemical Technology.2010-2015,Ph... 详细信息

关键词： Spotlight Editorial Board

Study on specific interaction of new ferrocene-substituted carborane conjugates with hemoglobin protein

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

science china chemistry 2012年第4期55卷 594-603页

作者： WU ChunHui1,3, YE HongDe2, JIANG Hui1, WANG XueMei1 & YAN Hong2 1State Key Lab of Bioelectronics (Chien-Shiung Wu Lab), Southeast university, nanjing 210096, china 2State Key laboratory of Coordination chemistry school of chemistry and chemical engineering, nanjing university, nanjing 210093, china 3school of life science and Technology, university of Electronic science and Technology of china, Chengdu 610054, china State Key Lab of Bioelectronics (Chien-Shiung Wu Lab) Southeast University Nanjing China school of life science and Technology University of Electronic Science and Technology of China Chengdu China State Key laboratory of Coordination chemistry school of chemistry and chemical engineering Nanjing University Nanjing China

The interactions between the new organometallic complexes, ferrocenesubstituted dithioocarborane conjugates （denoted as FcSB1, FcSB2 and FcSBCO） and hemoglobin （Hb） are investigated by electrochemistry, fluorescence and UVvis absorption spectroscopy. The results demonstrate that FcSB1, FcSB2 and FcSBCO can bind to the heme iron center through the replacement of the weakly bound H20/02 in the distal heme pocket of Hb by their sulfur donor atoms, inducing the allosteric change from the R state （oxygenated conformation, relax） to T state （deoxygenated conformation, tense）. The binding affinity is in the order of FcSBCO〉FeSB2〉FeSB1. Moreover, the fluorescence study illustrates that the three ferrocenecarborane conjugates differently affect the quarterly and tertiary structures as well as the polarity in the surrounding of the Trp and Tyr residues in Hb. Typically, FcSB2 mainly induces alterations of the microenvironment around the 1337Trp residue which is located on the cql32 interface of Hb. Such distinct influences are attributed to the structural features of FcSB1, FcSB2 and FcSBCO containing hydrophobic ferrocenyl and carboranyl units as well as C=O group. Screening the proteinbinding behavior can signify the potential bioactivity of such molecules and may be helpful in the future development of promising multifunctional metallodrugs.

关键词： fluorescence – UV vis absorption spectroscopy – differential pulse voltammetry – biomolecular interaction – ferrocene substituted carborane conjugates – hemoglobin

Predicting bioconcentration factor values of organic pollutants based on medv descriptors derived QSARs

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 587-592页

作者： CUI ShiHai1,2, YANG Jing1, LIU ShuShen2,3 & WANG LianSheng2 1 College of chemistry and Environment, nanjing Normal university, nanjing 210097, china 2 State Key laboratory of Pollution Control and Resources Reuse, school of the Environment, nanjing university, nanjing 210093, china 3 Key laboratory of Yangtze Aquatic Environment, ministry of education, College of Environmental science and engineering, Tongji university, Shanghai 200092, china College of chemistry and Environment Nanjing Normal University Nanjing China State Key laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing China Key laboratory of Yangtze Aquatic Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai China

The molecular electronegativity-distance vector (MEDV) is employed todescribe the chemical structure of organic *** linear relationships between themolecular descriptors and BCF values are developed by best subset regression and partial leastsquare regression *** main structural factors influencing the bioactivities are -CH2,-X,-Cnot <,- C not <,-O-.The high values of r2 and q2_(LOO) present good estimation ability and stabilityof *** prediction power for external samples is validated by the model developed from thetraining set.

关键词： POPs, BCF, MEDV, QSAR

Mesoporous Si-MCM-48 membrane prepared by pore-filling method

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2010年第4期53卷 1064-1068页

作者： XU DeKan & FAN YiQun State Key laboratory of Materials-Oriented chemical engineering,College of chemistry and chemical engineering,nanjing university of Technology,nanjing 210009,china State Key laboratory of Materials-Oriented chemical engineering College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing China

Mesoporous MCM-48 membranes were prepared on asymmetric zirconia tubular support with an average pore size of 0.2 μm by hydrothermal *** support should be pretreated with H2O as a pore-filling substance to prevent the sol solution from infiltrating into the support *** SEM showed that the MCM-48 membrane was composed of tightly-connected spherical *** single gas N2 and H2 permeation experiments confirm that crack-free membrane could be prepared by pore-filling method.N2 permeance of MCM-48 membrane,synthesized by secondary growth,can reach 5.66×10-7 mol/Pa·s·m2,and the H2/N2 separation factor was 3.47 under trans-membrane pressure of 0.05 MPa.

关键词： MCM-48 mesoporous membrane pore-filling

Hydroisomerization of n-heptane over bimetal-bearing H_3PW_(12)O_(40) catalysts supported on dealuminated USY zeolite

在线全文

学校读者我要写书评

暂无评论

science china chemistry 2008年第2期51卷 120-127页

作者： WEI RuiPing1,2, GU YanBo1 & WANG Jun1 1 State Key laboratory of Materials-Oriented chemical engineering, College of chemistry and chemical engineering, nanjing Uni- versity of Technology, nanjing 210009, china 2 College of chemistry and chemical engineering, Southeast university, nanjing 211189, china State Key laboratory of Materials-Oriented chemical engineering College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing China College of chemistry and chemical engineering Southeast University Nanjing China

The bimetal-bearing (CePt or LaPt) 12-tungstophosphoric acid (H3PW12O40 (PW)) catalysts supported on dealuminated USY zeolite (DUSY) were prepared by impregnation and characterized by XRD, BET, IR, and H2-chemisorption. Their catalytic activities were tested in the hydroisomerization of n-heptane with a continuous atmospheric fixed-bed reactor. After the steam treatment combined with the acid leaching, as well as the supporting with PW and the bimetals, the DUSY support retains the Y zeolite porosity and the PW well keeps its Keggin structure in catalysts. The doping of Ce into the catalysts enhances the dispersion of Pt on the catalyst surface. The Pt-bearing PW catalysts doped with Ce or La, especially Ce, exhibit much higher catalytic activity and selectivity than the catalysts without dopants at lowered reaction temperatures. At the optimal reaction conditions, i.e., the reaction temperature of 250℃ and WHSV of 1.4 h1, the catalyst with a Pt loading of 0.4%, PW loading of 10% and a molar ratio of Ce to Pt of 15:1 shows a conversion of n-heptane of 70.3% with a high selectivity for isomerization products of 94.1%.

关键词： hydroisomerization of n-heptane bimetal catalyst heteropoly acid USY platinum

Surface Modification of Silk Fibroin Films with Zwitterionic Phosphobetaine to Improve the Hemocompatibility

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials science) 2010年第6期25卷 969-974页

作者：蒋雪峰陈强 school of chemistry and chemical engineering Nanjing University

Zwitterionic phosphobetaine bearing a hydroxyl and a zwitterionic group,8-hydroxy-2-octyl phosphorylcholine（HOPC）,was synthesized and constructed to the surface of silk fibroin（SF） films in order to improve the hemocompatibility of fibroin films by a an isocyanate head *** surface characteristics of the modified films were measured by attenuated total reflection Fourier transform infrared spectroscopy（ATR-FTIR） and electron spectroscopy for chemical analysis（ESCA）,displaying the successful immobilization of Zwitterionic phosphobetaine on the surface of these fibroin ***,the further platelet adhesion test in platelets rich plasma（PRP） of human beings showed the zwitterionic phosphobetaine led mainly to good *** experimental results indicated a reasonable approach to improve the blood compatibility of fibroin films.

关键词： zwitterionic phosphobetaine silk fibroin blood compatibility platelet adhesion

Two novel interpenetrated zinc(Ⅱ) and cadmium(Ⅱ) coordination polymers based on 4-imidazole-benzoate:Syntheses,crystal structures and properties

在线全文

学校读者我要写书评

暂无评论

science china chemistry 2009年第4期52卷 459-464页

作者： BAI ZhengShuai,CHEN ShuiSheng,ZHANG ZhengHua,CHEN ManSheng,LIU GuangXiang & SUN WeiYin State Key laboratory of Coordination chemistry,Institute of Coordination chemistry,school of chemistry and chemical engineering,nanjing university,nanjing 210093,china State Key laboratory of Coordination chemistry Institute of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing China

Two novel interpenetrated coordination polymers,[Zn(IBA)2]n (1) and {[Cd(IBA)2(H2O)].4H2O}n (2),have been synthesized by using 4-imidazole-benzoic acid (HIBA) as ligand under hydrothermal con-ditions. Complex 1 crystallizes in a chiral space group and has a two-fold interpenetrated 2D network structure with (4,4) topology,while complex 2 is a 3D porous dia network with four nets interpene-trating each other. The SHG activity of 1 and the photoluminescent property of 2 have been investi-gated.

关键词： coordination polymer interpenetration crystal structure photoluminescence property