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Adsorption and corrosion inhibition behavior of imidazole on cobalt electrodes studied by SERS and electrochemical methods

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Science China chemistry 2005年第6期48卷 497-503页

作者： GU Wei1. LIU Guokun2. REN Bin2. WU Deyin2. GU Renao1.& TIAN Zhongqun2.1. department of chemistry, {1., Suzhou university, Suzhou 2.0}006, China 2. State Key Laboratory for Physical chemistry of Solid Surfaces and department of chemistry, {1., xiamen university, xiamen 361.05, China 1. department of chemistry College of Chemistry and Chemical Engineering Suzhou University 215006 Suzhou China 2. State Key Laboratory for Physical chemistry of Solid Surfaces and {1. College of Chemistry and Chemical Engineering Xiamen University 361005 Xiamen China

The interaction of imidazole with Co electrodes in an electrochemical system was studied by surface-enhanced Raman scattering (SERS) and electrochemical methods. The SER spectra of Co in an imidazole solution as a function of the applied potential were analyzed and the assignment of the Raman bands was made. It was found that there were three kinds of sur-face species on the Co surface in different potential regions and they were interchangeable de-pending on the potential. In a relatively negative potential region (?{2.2.to ?0.9 V), imidazole was adsorbed on the surface and its orientation might change from a vertical configuration via the N-end of the pyridine ring to a tilted configuration via the C2.N3 double bond. In a more positive potential region (?0.8 to ?0.7 V), the SERS signal from the adsorbed imidazole weakened and finally disappeared, meanwhile the signal from the Co and imidazole complex strengthened gradually. At the open circuit potential (?0.6 V), we detected very strong bands from the Co ox-ides. By comparing the Tafel curves of the Co electrode in the solution without and with imidazole, we found that imidazole has a marked effect on the corrosion inhibition of the Co electrode. This result demonstrates that we may be able to reveal the complicated interaction of surface species with metal surface at the molecular level by combining the SERS and electrochemical methods.

关键词： cobalt, imidazole, inhibition, surface-enhanced Raman spectroscopy, Tafel plot.

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Controllable incorporation of CdS nanoparticles into TiO_2.nanotubes for highly enhancing the photocatalytic response to visible light

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Science China chemistry 2009年第12期52卷 2148-2155页

作者： WANG ChengLin1.SUN Lan1.XIE KunPeng1.& LIN ChangJian1.2.1.department of chemistry,{1.,xiamen university,xiamen 361.05,China 2.State Key Laboratory of Physical chemistry of Solid Surfaces,xiamen university,xiamen 361.05,China 1. department of chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China 2. State Key Laboratory of Physical chemistry of Solid Surfaces Xiamen University Xiamen 361005 China

A constant current electrochemical deposition was employed to incorporate CdS nanoparticles into the TiO2.nanotube arrays (TiO2.Ts). The size and amount of CdS nanoparticles in TiO2.Ts (CdS@TiO2.Ts) were controllable via modulating current,deposition time and electrolyte concentration. It was revealed,from the scanning electron microscopy (SEM) images and X-ray photoelectron spectroscopy (XPS) in depth profile,that CdS nanoparticles were filled into TiO2.nanotubes. A shift of the absorption edge toward the visible region under the optimal electrodeposition condition was observed with the diffuse reflectance spectroscopy (DRS). A 5-fold enhancement in the photocurrent spectrum for TiO2.Ts was observed and the photocurrent response range was significantly extended into the visible region because of the CdS incorporation. Compared with pure TiO2.Ts,under a visible light irradiation,CdS@TiO2.Ts exhibited a 3.5-fold improvement of photocatalytic activity,which was demonstrated by the photocatalytic decomposition of Rhodamine B (RhB).

关键词： TiO2 nanotube CdS photocatalysis RhB

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Synthesis,characterization,structures and magnetic property of chiral oxalate-bridged dicopper(Ⅱ) complexes

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Science China chemistry 2010年第6期53卷 1255-1260页

作者： WU Ling1,WANG Jun2.ZHU CaiFei1,LIN YiJi1,CHEN LeiQi1,FAN Jun2.& ZHANG Hui1 1State Key Laboratory of Physical chemistry of Solid Surfaces {1.,{2.,xiamen university,xiamen 361.05,China 2.chool of chemistry and environment,south China Normal university,{1.},China 1. State Key Laboratory of Physical chemistry of Solid Surfaces department of chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China2. School of Chemistry and Environment South China Normal University Guangzhou 510006 China

The oxalato-bridged dicopper(II) complexes [Cu2.μ-ox)(LRR)2.H2.)2.ClO4)2. (1.,[Cu2.μ-ox)(LRR)2.CH3COCH3)2.ClO4)2.(1.),[Cu2.μ-ox)(LSS)2.H2.)2.ClO4)2. (2. and [Cu2.μ-ox)(LRR)(LSS)2.CH3COCH3)2.ClO4)2. (3) [LRR = (8R,1.R)-(-)-[4,5]-pineno2.2.-bipyridine,LSS = (8S,1.S)-(+)-[4,5]-pineno-2.2.-bipyridine;ox2. oxalate] were first prepared.A possible mechanism for the formation of the chial dicopper(II) complexes was *** on elemental analysis,conductance measurement,UV-Vis spectra,CD spectra and X-ray single-crystal diffraction,the oxalato-bridged structures of 1.and 2.were deduced to adopt two Cu(II) ions and the bridged oxalate lying in the nearly same *** crystal structures of 1. and 3 reveal that the coordination geometry around each Cu(II) ion is an elongated and distorted octahedron and two axial solvent molecules and two perchlorate ions are anti to each other respectively in both binuclear *** solution CD spectra of 1.and 2.in the visible d-d range show very weak Cotton effects with peaks at 588 and 779 nm,which are approximately of mirror image,suggesting the optical activities may be derived from the vicinal effects of the chiragenic centers at the pinene group of LRR and LSS,*** 1.has been characterized by variable-temperature magnetic susceptibility and the data was least-square fitted to the Blenaey-Bowers *** exchange integral J was found to be -338.41.4) cm-1.indicating a strong antiferromagnetic interaction between two copper(II) ions.

关键词： dicopper(II) complex chiral bipyridine μ-oxalate bridge crystal structure CD spectroscopy magnetic property

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Study on interaction between macrocell and microcell in the early corrosion process of reinforcing steel in concrete

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Science China(Technological Sciences) 2010年第5期53卷 1285-1289页

作者： LI LanQiang1.DONG ShiGang1.WANG Wei2.HU RongGang1.DU RongGui1.LIN ChangJian1.ZHUO XiangDong1.& WANG Jia2.1.State Key Laboratory of Physical chemistry of Solid Surfaces,{1.,college of chemistry and chemical engineering,xiamen university,xiamen 361.05,China 2.college of chemistry and chemical engineering,Ocean university of China,Qingdao 2.61.0,China 1. State Key Laboratory of Physical chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China2. College of Chemistry and Chemical Engineering Ocean University of China Qingdao 266100 China

An array electrode technique was developed as a novel electrochemical method for studying the interaction between macrocell and microcell in the early corrosion process of reinforcing steel in cement *** corrosion potential and galvanic current of macrocell corrosion of the reinforcing steel in cement mortar were imaged by the array electrode technique during the corrosion initiation and *** was certified that the corrosion macrocell current is closely related with the difference of corrosion potential between the anodic and cathodic *** corrosion macrocell and microcell always exist during the corrosion *** interaction of corrosion macrocell and corrosion microcell of steel in concrete was directly sensed by the array electrode for the first time,and was discussed in terms of corrosion electro{1..

关键词： reinforcing steel in concrete array electrode macrocell microcell

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Extended detection range for an optical enzymatic glucose sensor coupling with a novel data-processing method

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Science China chemistry 2010年第6期53卷 1385-1390页

作者： GUO GuangMei1.WANG XuDong2.ZHOU TingYao2.& CHEN Xi2.1.0} of Sciences,Hebei {1. of Science and Technology,Shijiazhuang 05001.,China 2.4},college of chemistry and chemical engineering,xiamen university Key Laboratory of Analytical Sciences of xiamen university,xiamen 361.05,China 1. college of Sciences Hebei University of Science and Technology Shijiazhuang 050018 China2. Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Key Laboratory of Analytical Sciences of xiamen university Xiamen 361005 China

A new data-processing method was established and applied for optical enzymatic glucose sensing,in which oxygen and glucose were simultaneously *** oxygen level remaining in the detection system,which was equal to the difference between the initial and consumed oxygen concentrations,could be measured using fluorescent oxygen indicators immobilized in the sensing *** was deduced that the ratio of I0 and I was inversely proportional to glucose concentration,where I0 is the maximum fluorescence intensity in various glucose solutions,and I is the fluorescence intensity at various concentrations of *** the new data-processing method,the detection range of the calibration curve method was extended from 0 to 1.2.mmol L-1.which was enlarged about 2.3 folds over that in ordinary *** prepared glucose sensor could be directly applied to detect high concentrations of glucose.

关键词： optical glucose sensor glucose oxidase extended detection range

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Supporting of Nickel(Ⅱ) Acenaphthenediimine with Free Amino Group for Ethylene Polymerization

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Journal of Wuhan university of Technology(Materials Science) 2010年第2期25卷 260-264页

作者：胡扬剑 department of chemistry and {1. {2. Huaihua College

Bis （4-（4-amino-3, 5-diethylbenzyl）-2. 6-diethylphenylimino） acenaphthene] di- chloronickel （NiLCl2. was prepared and supported on SiO2.modified by methyl trichlorsilane（S-1. and on SiO2.MgCl2.TiCl4 （S-2. respectively. Two supported catalysts S-1.and S-2.used as catalysts for ethylene polymerization were studied and the influences of various polymerization conditions, including the polymerization temperature, cocatalysts, Al/Ni molar ratio on the catalytic activity, branching degree and branch length of PE were also investigated. The experimental results show that the supported catalysts exhibit higher catalytic activity for ethylene polymerization, the highest catalytic activity of S-1.using AlEt2.l as cocatalyst at 50 ℃, reaching 5.8×1.^5gPE/molNi·h, and needed lower Al/Ni molar ratio compared to homogeneous analogue.

关键词： nickel diimine complex supported catalyst branched polyethylene diethylaluminium chloride

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Infinite Three-Dimensional Coordination Polymers: Synthesis and Structures of [Cd (4,4'-bpy)_2.(H_2.)_2._n (pic)_(2.),[Zn (4,4'-bpy)_2.(H_2.)_2._n(pic)_(2.) (H_2.)_(2.), and [Zn (4,4'-bpy)_2.(H_2.)_2._n (4,4'-bpy)_n(H_2.)_n (pic)_(2.)

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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 {1.: Guilin 541.04 2.department of chemistry. xiamen university. xiamen 361.05) 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_2.)_2._n. (pic)_(2.) (1. [Zn (4,4'-bpy)_2.(H_2.)]_n (4,4'-bpy)_n(H_2.)_n (pic)-(2.) (2. and [Zn (4,4'-bpy)_2.(H_2.)]_n (4,4'-bpy)_n (pic)-(2.)(H_2.)_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.

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A simple solvothermal route towards the morphological control of ZnO and tuning of its optical and photocatalytic properties

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Science China chemistry 2010年第8期53卷 1711-1717页

作者： JIANG YaQi,LI FangFang,SUN Ran,XIE ZhaoXiong & ZHENG LanSun State Key Laboratory for Physical chemistry of Solid Surfaces {1.,{2.,xiamen university,xiamen 361.05,China 1. State Key Laboratory for Physical chemistry of Solid Surfaces department of chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China

ZnO nanoparticles with different morphologies were solvothermally synthesized by controlling the alkali (sodium hydroxide) concentration in an isopropanol *** products were characterized by means of powder X-ray diffraction,UV-visible absorption spectra,scanning electron microscopy,transmission electron microscopy,and selected area electron *** morphologies of the formed ZnO nanocrystals were dependent on the concentration of the alkali,and with increases of sodium hydroxide concentration,the ZnO nanocrystals evolved from rod to hexagonal bipyramid,and then to a flower-like *** flower-like nanostructure resulted from the etching of the hexagonal bipyramid by the excess *** photoluminescence and photocatalytic properties of the prepared ZnO were *** difference of green emission among the ZnO nanocrystals indicated that a higher sodium hydroxide concentration led to a higher level of *** size,the surface structure and defects in the ZnO nanocrystals affected its photo-degradation characteristics.

关键词： zinc oxide solvothermal method nanocrystal photoluminescence photocatalysis

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PHOTOINDUCED　INTRAMOLECULAR　CHARGE　TRANSFER　IN　SELF－***　AND　DUAL　FLUORESCENCE　OF　ETHYL　P－DIDECYLAMINOBENZOATE　IN　DIOXANE－WATER　BINARY　SOLVENT

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Chinese chemical Letters 1996年第2期7卷 173-176页

作者： Yun Bac JIANG(department of chemistry and Institute of Analytical {1.,{2., xiamen 361.05) xiamen UNIV DEPT CHEMXIAMEN 361005PEOPLES R CHINA xiamen UNIV INST ANALYT CHEMXIAMEN 361005PEOPLES R CHINA

Aggregation of ethyl p-didecylaminobenzoate (EDDAB) in dioxane-water binary mixture was shown to occur at water volume fraction of 0.47 and a strong intramolecular charge transfer emission was observed in the aggregate.

关键词： ORGANIC-MOLECULES 4-(N,N-DIMETHYLAMINO)BENZOATE COILING EXCIMER

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Concise synthesis of two advanced intermediates for the asymmetric synthesis of polyhydroxylated indolizidine alkaloids

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Science China chemistry 2010年第9期53卷 1914-1920页

作者： ZHENG Xiao1.2.ZHU WenFang1.& HUANG PeiQiang1.1.0},{1.,xiamen university,xiamen 361.05,China 2.ey Laboratory of Synthetic chemistry of Natural Substances Shanghai Institute of Organic chemistry,Chinese Academy of Sciences,Shanghai 2.0032.China 1. department of chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China2. Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic chemistry Chinese Academy of Sciences Shanghai 200032 China

A concise five-step approach to indolizidinones 1. and 1.,two advanced intermediates for the asymmetric synthesis of polyhydroxylated indolizidine alkaloids,has been developed by using N-Cbz pyrrolidin-2.yl pyridin-2.yl sulfide 1. as the chiral building *** method features a SmI2.mediated coupling of sulfide 1. with functionalized aldehyde 1. and a tandem N-deprotection-lactamization,which constitutes a stepwise "2.+ 4" annulation method for the construction of the indolizidinone ring system of 12..

关键词： indolizidinone samarium diiodide α-amidohydroxyalkylation tandem reaction chiral building block

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