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Determination of abscisic acid based on the fluorescent quenching of quantum dots

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Science china chemistry 2010年第1期53卷 245-249页

作者： ZHANG lei,GUAN HongLiang & HE ZhiKe Key Laboratory of Analytical chemistry for Biology and Medicine,Ministry of Education {2. of chemistry and Molecular sciences,wuhan university,wuhan 430072.china Key Laboratory of Analytical chemistry for Biology and Medicine Ministry of Education college of chemistry and Molecular {2. Wuhan University Wuhan China

The quenching mechanism of the fluorescence of quantum dots by abscisic acid has been systematically *** quenching constant KSV = 5.1 × 1011 / M was obtained under the optimized *** the basis of that,a very sensitive method for the determination of abscisic acid has been *** linear equation was F0/F = 0.9309 + 0.5072.C(pmol/L) and its linear range was 0.2.3.0 pmol/L with a correlation coefficient of *** limit of detection was 0.09 pmol/L.

关键词： abscisic acid quantum dots superquenching

Studies on the Behaviors of PbSO_4/Pb and PbO_2.PbSO_4 Electrodes Prepared from Lead Carbonate by Powder Microelectrode Technique

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wuhan university Journal of Natural sciences 2000年第4期5卷 474-478页

作者： Dai Zhong-xu, Wang Di-hua, Zou jin-yun, Zhou Yun-hong college of {2. and Environmental Science, wuhan university, wuhan 430072, china college of chemistry and Environmental Science Wuhan University Wuhan China

The behaviors ot PbSO4/Pb and PbO4/PbSO4 electrode prepared from PbCO3 have been examined using powder microelectrode(PME) technique and cyclic voltammetry(CV). Firstly, PMEs parked with Pb- CO3 transformed into PtSO4 PME in 1. 0 mol/L H2.O4 solution at 30 C, and then the PbSO4 in the PMEs were formed to Pb or PbO2.using an unsymmetrical signal(Qa/Qe for PbSO4/Pb electrode and Qe/Qa for PsO2. PbSO4 electrode being 0. 1-0. 3) in 2. S mol/L H2.O4 solution. The results show that the CV characteristic of either PbSO4/Pb or PsO2.PbSO4 PME prepared from PhCO3 are as good as that of both electrodes made from lead oxide powder produced by ball mill.

关键词： lead carbonate powder microelectrode lead/acid battery formation

Electrochemical-Voltammetry Behavior of Several Aromatic Aldehydes in Acid Solution

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wuhan university Journal of Natural sciences 2000年第4期5卷 485-490页

作者： Zhou Xiao-rong,Li Wei-dong, Hu jin, Zuo Zheng-zhong college of {2. and Environmental Science,wuhan university,wuhan 430072, china college of chemistry and Environmental Science Wuhan UniversityWuhan 430072China

The electrochemical-voltammetry behavior of vanillin, heliotropin, anisaldehyde on the surface of Pt, Au electrodes in acid solution has been studied by means of the electrochemical cyclic voltammetry method. It was found that the electrochemical processes of them are irreversible on both Pt and Au electrodes. The electrochemical activity of vanillin is stronger than heliotropin's and heliotropin's is stronger than anisaldehyde's on Pt electrode. While the electrochemical activity of anisaldehyde is stronger than heliotropin's and vanillin's is the weakest on Au. The results indicate that when they are used as additives for electroplating, they must be consumptive, and it will improve the leveling ability of plating solution and brightness of the deposition layer.

关键词： Key words aromatic aldehyde acid solution electrochemical behavior cyclic voltammetry

Study on Laccase-Catalyzed Oxidation of Disubstituted Ferrocene and π-arene-π- cyclopentadienyliron Derivatives

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wuhan university Journal of Natural sciences 2000年第3期5卷 351-356页

作者： Ji Li-cai1, Hu Pei-zhi2. jin Chang-hua3 , Ding Zi-rong2.1. college of Adult Education, {2., wuhan 430072, china 2. Col lege of chemistry and Environment Science, {2., wuhan 430072, C hina 3,Yiping Plant of chemistry and Industry at Zhong Qing City, Zhong Qing 63132., china college of Adult Education Wuhan University Wuhan 430072 China college of chemistry and Environment Science Wuhan University Wuhan 430072 China Yiping Plant of chemistry and Industry at Zhong Qing City Zhong Qing 631323China

It is studied that Rhus vernicifera laccase catalyzed oxidation of 2. disubstituted ferrocene and its metal complexes, π-arene-π-cyclopentadienyliron derivatives and metal meso-(tetra-4-sulfanatophenyl)porphyrin in the diethylene glycol monobutyl ether (DGBE)/phosphate buffer (V/V, 1/5). It is found that 1,1′-bishydroxylmethyl ferrocene etc 16 compounds are new substrates of laccase. The relation of structure and function of substrates is discussed. The affective factors of laccase-catalyzed oxidation of 1,1′-bishydroxyl-methyl ferrocene—pH, temperature, substrate concentration, laccase quantity and surfactant were investigated further.

关键词： Key words Rhus vernicifera laccase disubstituted ferrocene catalytic oxidation π arene π cyclopentadienyliron

Synthesis and Characterization of Two New Photochromic Inorganic-organic Hybrid Materials Based on Keggin-type Polyoxometalates

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Journal of wuhan university of Technology(Materials Science) 2008年第3期23卷 367-371页

作者：库宗军 college of chemistry and Materials {2. Xiaogan University

Two new photochromic inorganic-organic hybrid materials formed from Keggin-type polyoxometalates（POMs） and metronidazole （C6H9N3O3, MNZ）, formulated as H3PMo12.aO-3MNZ·3H2. （1） and H3PW12.40.3MNZ·3H2.（2., were synthesized and characterized by elemental analysis, IR spectra, electronic spectra, electron spin resonance （ESR） spectra and thermogravi-metry-differential thermal analysis （TG-DTA）. Reflectance spectra show the presence of weak intermolecular charge transfer between the organic and inorganic moieties in the solid state. The photochromic properties were studied by solid diffuse reflectance spectra and ESR spectra, and the photochromic reactions were found to exhibit first-order kinetics. TG-DTA showed that two hybrid materials have similar thermal behavior.

关键词： polyoxometalate metronidazole hybrid material photochromism kinetics

Hydrothermal Synthesis,Crystal Structure and Properties of Inorganic-Organic Hybrid Materials Based on Diphosphopentamolybdate

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Journal of wuhan university of Technology(Materials Science) 2008年第3期23卷 407-410页

作者：靳素荣 School of Science Wuhan University of Technology

The compound of diphosphopentamolybdate { [Cu（en）（Hen）]2.P2.o5O2.] }·3H2. [en=ethylenediamine] had been obtained from the hydrothermal method and characterized by single crystal X-ray diffraction, elemental analysis, FT-IR, and thermogravimetric analysis The structure consist of [P2.o5O2.]^6- clusters anions, complex [Cu（en）（Hen）]^3＋ cations and crystallization water molecules, which are held together to a two-dimensional framework The most interesting feature of the compound is that two nitrogen atoms are both coordinated with Cu（ Ⅱ ） in one ethylenediamine molecule, for the other ethylenediamine molecule, only one nitrogen atom is towards Cu（ Ⅱ） and the other nitrogen atom is protonated and formed Hen^＋.

关键词： polyoxometalate hydrothermal synthesis crystal structure coordination groups

Study on Synthesis and Biological Activities of Novel Water-Soluble Metalloporphyrins

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wuhan university Journal of Natural sciences 2001年第4期6卷 841-845页

作者： Li Zao-ying, Zhang Yue ning, Xiao Wei, Zhu Xun jin,Gao Zhen ting, Liu Yi college of {2. and Molecular Science, wuhan university, wuhan, 430072, china college of chemistry and Molecular Science Wuhan University Wuhan China

The synthesis and characterization of a series of metal porphyrins, MII(Por), {Por=dianionic of 5, 10, 15, 2.-tetrakis [4-(4′-bromobutyloxy) phenyl]porphyrinato and 5, 10, 15, 2.-tetrakis [4-(4′-butyloxypyridine bromide)phenyl]porphyrinato, M=Zn, Cu, Mn, Co, Ni, Ru-CO} were described. The complexes 3a-3e were prepared from the reactions of compound 2.with metal acetates in chloroform, and the treatment of 3a-3f with excess of pyridine gave corresponding complexes 4a-4f. These new compounds were identified by absorption spectroscopies,1H-NMR and elemental analyses. The results of biological activity testing for 4a-4f revealed that 4a and 4c had stronger inhibiting action on the growth metabolism ofEsche richia coli.

关键词： water soluble metalloporphyrin synthesis structure characterization biological activity testing

Engineering g-C_(3)N_(4)based materials for advanced photocatalysis:Recent advances

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Green Energy & Environment 2024年第2期9卷 166-197页

作者： Xin-Lian Song lei Chen Li-Jiao Gao jin-Tao Ren Zhong-Yong Yuan National Institute for Advanced Materials School of Materials Science and EngineeringSmart Sensing Interdisciplinary Science CenterNankai UniversityTianjin300350China Key Laboratory of Advanced Energy Materials chemistry(Ministry of Education) Nankai UniversityTianjin300071China

Photocatalysis driven by abundant yet intermittent solar energy has considerable potential in renewable energy generation and environmental *** outstanding electronic structure and physicochemical properties of graphitic carbon nitride(g-C_(3)N_(4)),together with unique metal-free characteristic,make them ideal candidates for advanced photocatalysts *** review summarizes the up-to-date advances on g-C_(3)N_(4)based photocatalysts from ingenious-design strategies and diversified photocatalytic ***,the advantages,fabrication methods and limitations of each design strategy are systemically *** order to deeply comprehend the inner connection of theory–structure–performance upon g-C_(3)N_(4)based photocatalysts,structure/composition designs,corresponding photocatalytic activities and reaction mechanisms are jointly discussed,associated with introducing their photocatalytic applications toward water splitting,carbon dioxide/nitrogen reduction and pollutants degradation,***,the current challenges and future perspectives for g-C_(3)N_(4)based materials for photocatalysis are briefly *** design strategies and limitations are also instructive for constructing g-C_(3)N_(4) based materials in other energy and environment-related applications.

关键词： Graphitic carbon nitride g-C_(3)N_(4) Design strategies Photocatalysis Photocatalysts Reaction mechanism

First-Arrival Picking Method for Active Source Data with Ocean Bottom Seismometers Based on Spatial Waveform Variation Characteristics

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Journal of Ocean university of china 2024年第4期23卷 970-980页

作者： LIU Hongwei XING lei ZHU Henghua ZHANG jin ZHANG jing LIU Huaishan Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationCollege of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Qingdao Marine Science and Technology CenterQingdao 266071China college of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin 150001China Shandong Institute of Geological Survey Jinan 250014China

The precision and reliability of first-arrival picking are crucial for determining the accuracy of geological structure inversion using active source ocean bottom seismometer(OBS)refraction *** methods for first-arrival picking based on sample points are characterized by theoretical errors,especially in low-sampling-frequency OBS data because the travel time of seismic waves is not an integer multiple of the sampling *** this paper,a first-arrival picking method that utilizes the spatial waveform variation characteristics of active source OBS data is ***,the distribution law of theoretical error is examined;adjacent traces exhibit variation characteristics in their ***,a label cross-correlation superposition method for extracting highfrequency signals is presented to enhance the first-arrival picking *** from synthetic and field data verify that the proposed approach is robust,successfully overcomes the limitations of low sampling frequency,and achieves precise outcomes that are comparable with those of high-sampling-frequency data.

关键词： first-arrival picking spatial waveform variation label cross-correlation superposition method