Vinylic and ring-opening metathesis polymerization of norbornene with bis(beta-ketoamine) cobalt complexes
作者：
Bao, F;Lu, XQ;Gao, HY;Gui, GQ;Wu, Q*
期刊：
Journal of Polymer Science ,2005年43(22):5535-5544 ISSN：2642-4150
通讯作者：
Wu, Q
作者机构：
[Wu, Q] Zhongshan Univ, Inst Polymer Sci, Guangzhou 510275, Peoples R China.;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.;Zhongshan Univ, Sch Chem & Chem Engn, Guangzhou 510275, Peoples R China.
通讯机构：
[Wu, Q] Z;Zhongshan Univ, Inst Polymer Sci, Guangzhou 510275, Peoples R China.
关键词：
β‐ketoamine;cobalt complexes;catalysts;crystal structures;norbornene;ROMP;vinylic polymerization
摘要：
Abstract Cobalt complexes 1–4 bearing N,O‐chelate ligands based on condensation products of 1‐phenyl‐3‐methyl‐4‐benzoyl‐5‐pyrazolone with aniline, o‐methylaniline, α‐naphthylamine, and p‐nitroaniline, respectively, were synthesized, and the structures of 1 and 4 were characterized by single‐crystal X‐ray diffraction analyses. The bis(β‐ketoamine) cobalt complexes could act as moderately active catalyst precursors for norbornene polymerization with the activation of methylaluminoxane. This catalytic reaction proceeded mainly through a vinyl‐type polymerization mechanism. 1H NMR and IR showed that in all cases, a small amount of double bonds raised from ring‐opening metathesis polymerization (ROMP) was present in the polymerization products. The variation of the polymerization conditions affected the ROMP unit ratio in the polynorbornenes. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5535–5544, 2005 Cobalt complexes 1–4 bearing N,O‐chelate ligands based on condensation products of 1‐phenyl‐3‐methyl‐4‐benzoyl‐5‐pyrazolone with aniline, o‐methylaniline, α‐naphthylamine, and p‐nitroaniline, respectively, were synthesized, and the structures of 1 and 4 were characterized by single‐crystal X‐ray diffraction analyses. The bis(β‐ketoamine) cobalt complexes could act as moderately active catalyst precursors for norbornene polymerization with the activation of methylaluminoxane. This catalytic reaction proceeded mainly through a vinyl‐type polymerization mechanism. 1H NMR and IR showed that in all cases, a small amount of double bonds raised from ring‐opening metathesis polymerization (ROMP) was present in the polymerization products. The variation of the polymerization conditions affected the ROMP unit ratio in the polynorbornenes.
语种：
英文
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Improving the elevated temperature performance of Li/LiMn2O4 cells by coating with ZnO
作者：
Liu, HW* ;Cheng, CX;Hu, ZQ;Zhang, KL
期刊：
Journal of Materials Science ,2005年40(21):5767-5769 ISSN：0022-2461
通讯作者：
Liu, HW
作者机构：
[Liu, HW] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China.;S Cent Univ Natl, Coll Chem & Mat Sci, Wuhan 430072, Peoples R China.;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liu, HW] W;Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China.
关键词：
Polymer;Elevated Temperature;Temperature Performance;Elevated Temperature Performance
摘要：
Improvements in the high-temperature performance of spinel LiMn 2O4 electrodes by coating with zinc oxide (ZnO) was investigated. Power X-ray diffraction was employed to identify the crystalline phases. The cells were fabricated in an organ-filled glove box using lithium foil as anode, the spinel powders mixed with acetylene black and polytetrafluoroethylene as the cathode and 1M LiCIO4/PC: DMC as the electrolyte. The results concluded that the zinc oxide coated LiMn 2O4 compound shows excellent electrochemical properties.
语种：
英文
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Degradation of 4-chlorophenol by a microwave assisted photocatalysis method
作者：
Ai, ZH;Yang, P;Lu, XH*
期刊：
Journal of Hazardous Materials ,2005年124(1-3):147-152 ISSN：0304-3894
通讯作者：
Lu, XH
作者机构：
[Lu, XH] Huazhong Univ Sci & Technol, Environm Sci Res Inst, Wuhan 430074, Peoples R China.;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Lu, XH] H;Huazhong Univ Sci & Technol, Environm Sci Res Inst, Wuhan 430074, Peoples R China.
关键词：
microwave assisted photocatalysis;electrodeless discharge lamp;4-chlorophenol
摘要：
In this work, the degradation of 4-chlorophenol (4CP) under simultaneous microwave assisted UV (electrodeless discharge lamp) photocatalysis technique (MW/UV/TiO<inf>2</inf>) was investigated. Several factors affecting the degradation of 4CP by MW/UV/TiO<inf>2</inf> method, such as the dosage of photocatalysts, the initial pH value of the solutions, gas bubbling, light intensity and addition of H<inf>2</inf>O<inf>2</inf> oxidant, were studied in detail. The synergistic effects between microwave irradiation and TiO <inf>2</inf> photocatalysis were also studied. The major intermediates were found to be chlorobenzene, phenol, hydroquinone, benzoquinone and 4-chlorocatechol. Based on the results, a general reaction pathway for the degradation of 4CP was proposed. ©2005 Elsevier B.V. All rights reserved.
语种：
英文
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Application of continuous-flow liquid-phase microextraction to the analysis of volatile halohydrocarbons in water
作者：
Li, YL;Zhang, TZ;Liang, P*
期刊：
Analytica Chimica Acta ,2005年536(1-2):245-249 ISSN：0003-2670
通讯作者：
Liang, P
作者机构：
[Liang, P; Li, YL; Zhang, TZ] Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.
关键词：
continuous-flow liquid-phase microextraction;volatile halohydrocarbons;GC-mu ECD
摘要：
A novel method for the determination of four volatile halohydrocarbons (CHCl3, CCl4, C2HCl3 and C 2Cl4) in water is developed by combined continuous-flow liquid-phase microextraction (CFME) with gas chromatography microelectron capture detection (GC-μECD). The effects of extraction solvent type and volume, flow-rate of sample solution, sample volume and salt concentration on the extraction performance were investigated and optimized. The developed protocol was found to yield a linear calibration curve in the concentration range from 0.02 to 20 μg L-1 for the target analytes, and the detection limits were found to be in the low μg L-1 level, between 0.001 and 0.02 μg L-1. Good repeatabilities of extraction were obtained, with the R.S.D. values below 4.3%. The results demonstrated that the CFME followed with GC-μECD was a simple and reliable technique for the determination of volatile halohydrocarbons in water samples. © 2004 Elsevier B.V. All rights reserved.
语种：
英文
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Degradation and metabolism of hexazinone by two isolated bacterial strains from soil
作者：
Wang, XD* ;Wang, HL;Tan, CX
期刊：
Chemosphere ,2005年61(10):1468-1474 ISSN：0045-6535
通讯作者：
Wang, XD
作者机构：
[Wang, XD] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.;Zhejiang Univ Technol, Pesticide Res Inst, Hangzhou 310014, Peoples R China.
通讯机构：
[Wang, XD] C;Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词：
Hexazinone;Microbial metabolites;Mixed bacterial culture;WFX-1;WFX-2
摘要：
Two hexazinone-degrading bacterial strains were isolated from soil by enrichment culture technique, and identified as Pseudomonas sp. and Enterobacter cloacap. The two purified isolates, designated as WFX-1 and WFX-2, could rapidly degrade hexazinone with a half-life of 3.08 days and 2.95 days in mineral salt medium (MSM), while their mixed bacterial culture was found to degrade hexazinone, at an initial concentration of 50 μg/ml, by enhancing 2.3-fold over that when the isolates were used alone. Two microbial metabolites (A and D) were obtained by preparative TLC and identified on the basis of the spectral data of IR, <sup>1</sup>H NMR and HPLC-ESI-MS, but both of them were known products as they had been reported in soil and vegetation metabolites of hexazinone. However, metabolites B and C were new degradates, whose molecular weights (MW) were 157 and 156, respectively, being reported from microbial metabolism for the first time. ©2005 Elsevier Ltd. All rights reserved.
语种：
英文
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Study of the interaction of CTZAMB–Cu(II) with DNA and the determination of DNA
作者：
Wang, LR;Wang, RX;Yang, LZ;Lu, GH*
期刊：
Journal of Electroanalytical Chemistry ,2005年585(2):214-219 ISSN：1572-6657
通讯作者：
Lu, GH
作者机构：
[Lu, GH] Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.;Chizhou Coll, Dept Chem, Guichi 247000, Peoples R China.;Wenzhou Med Coll, Sch Pharm, Wenzhou 325037, Peoples R China.
通讯机构：
[Lu, GH] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.
关键词：
2-(3-Carboxy-2,4,5-triazolylazo)-5-dimethylaminobenzoic acid;DNA;CTZAMB–Cu(II);Polarography;Voltammetry
摘要：
In this paper, the electrochemical behavior of the CTZAMB–Cu(II) complex with DNA has been investigated in potassium hydrogen–phthalate buffer solution (pH 2.5). In the absence of DNA, there was a sharp reduction peak in the single sweep polarogram due to the presence of CTZAMB–Cu(II), while in the presence of DNA this peak decreased in a quantitative fashion. This decrease in peak current is due to the formation of the CTZAMB–Cu(II)–DNA complex. Under the optimum conditions, the decrease of peak current is linear with DNA concentration in the range from 3.0 × 10−7 to 7.0 × 10−6 g ml−1, and the detection limit is 1.0 × 10−7 g ml−1. This new method exhibits a good recovery and sensitivity, which could be applied to the determination of DNA in real samples. The mechanism of the interaction of DNA and CTZAMB–Cu(II) is also discussed.
语种：
英文
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Biodegradation of imazapyr by free cells of Pseudomonas fluorescene biotype II and Bacillus cereus isolated from soil
作者：
Xuedong, W* ;Huili, W;Defang, F
期刊：
Bulletin of Environmental Contamination and Toxicology ,2005年74(2):350-355 ISSN：0007-4861
通讯作者：
Xuedong, W
作者机构：
[Xuedong, W] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.;Zhejiang Univ, Pesticides & Evironm Toxicol Inst, Hangzhou 310029, Peoples R China.
通讯机构：
[Xuedong, W] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词：
Waste Water;Bacillus;Biodegradation;Water Management;Water Pollution
摘要：
No abstract available
语种：
英文
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New efficient synthesis of 6,7,8,9-tetrahydro-benzothieno[2,3-d]-1,2,4-triazolo[1,5-a]pyrimidin-10( 3H)-ones via a tandem Aza-Wittig/heterocumulene-mediated annulation
作者：
Ding, MW* ;Huang, NY;He, HW
期刊：
SYNTHESIS-STUTTGART ,2005年2005(10):1601-1604 ISSN：0039-7881
通讯作者：
Ding, MW
作者机构：
[He, HW; Huang, NY; Ding, MW] Cent China Normal Univ, Coll chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构：
[Ding, MW] C;Cent China Normal Univ, Coll chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词：
aza-Wittig reaction;benzothieno[2,3-d]pyrimidin-4(3H)-one;benzothieno[2,3-d]-1,2,4- triazolo[1,5-a]pyrimidin-10(3H)-ones;triazole;iminophosphorane
摘要：
The carbodiimides 2, obtained from aza-Wittig reactions of iminophosphorane 1 with aromatic isocyanates, reacted with hydrazine to give selectively 3-amino-2-arylamino-5,6,7,8-tetrahydro-benzothieno[2,3-d]pyrimidin-4(3H)-ones 4. Reactions of 4 with triphenylphosphine, hexachloroethane and Et<inf>3</inf>N produced iminophosphoranes 5. A tandem aza-Wittig reaction of iminophosphorane 5 with isocyanate, acyl chloride or CS<inf>2</inf> generated 6,7,8,9-tetrahydro- benzothieno[2,3-d]-1,2,4-triazolo[1,5-a]pyrimidin-10(3H)-ones 7, 9 or 11 in satisfactory yields. ©Georg Thieme Verlag Stuttgart.
语种：
英文
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Base-catalyzed, efficient synthesis of 5-substituted 3,6-dihydro-7H-1,2,3- triazolo[4,5-d]pyrimidin-7-ones
作者：
Zhao, JF;Xie, C;Ding, MW* ;He, HW
期刊：
SYNTHESIS-STUTTGART ,2005年2005(15):2544-2548 ISSN：0039-7881
通讯作者：
Ding, MW
作者机构：
[He, HW; Zhao, JF; Xie, C; Ding, MW] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构：
[Ding, MW] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词：
pyrimidines;imides;cyclizations;aza-Wittig reactions;heterocycles;guanines
摘要：
The carbodiimides 2, obtained from aza-Wittig reactions of iminophosphorane 1 with aromatic isocyanates, reacted with secondary amines or ROH to give 5-dialkylamino or 5-alkoxy 7H-1,2,3-triazolo[4,5-d]pyrimidin-7-ones 4 in the presence of a catalytic amount of EtONa in a mixed solvent (CH <inf>2</inf>Cl<inf>2</inf>-ROH). Reactions of 2 with phenols in presence of catalytic potassium carbonate in MeCN gave 5-aryloxy-7H-1,2,3-triazolo[4,5-d] pyrimidin-7-ones 4 in satisfactory yields. ©Georg Thieme Verlag Stuttgart.
语种：
英文
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Base effect and inhibition of catalytic activity in palladium-catalyzed N-heteroarylation of pyrazoles with 2,6-dibromopyridine
作者：
Sun, XJ;Yu, ZK* ;Wu, SH;Xiao, WJ
期刊：
Organometallics ,2005年24(12):2959-2963 ISSN：0276-7333
通讯作者：
Yu, ZK
作者机构：
Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China.;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide, Wuhan 430007, Peoples R China.;[Yu, ZK] Chinese Acad Sci, Dalian Inst Chem Phys, 457 Zhongshan Rd, Dalian 116023, Peoples R China.
通讯机构：
[Yu, ZK] C;Chinese Acad Sci, Dalian Inst Chem Phys, 457 Zhongshan Rd, Dalian 116023, Peoples R China.
摘要：
Using the catalytic system Pd(OAc)(2)/PPh3, coupling of 2,6-dibromopyridine (1) and pyrazoles (2) in a molar ratio of 1:2:base = 1:2.4:2.5 afforded the monosubstituted compounds 3 as the major products when KOtBu was used as the base. Without using the catalyst or using NaOtBu as the base the disubstituted compounds 4 were formed as the major products in yields up to 93%. Reactions of 1 and 2 in a molar ratio of 1:2:base = 1:1:1 selectively produced compounds 3 in yields up to 82% when KOtBu was used as the base. The complex from the reaction of 3 and Pd(OAc)(2) did not undergo further reaction with 1 to form 4 in the presence of a base. The base effect and inhibition of catalytic activity for Pd(OAc)(2) are discussed.
语种：
英文
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Microwave-accelerated, palladium-catalyzed carbonylative cyclization reactions of 2-iodophenol with alkynes - Rapid and efficient synthesis of chromen-2-one derivatives
作者：
Cao, H;Xiao, WJ*
期刊：
CANADIAN JOURNAL OF CHEMISTRY ,2005年83(6-7):826-831 ISSN：0008-4042
通讯作者：
Xiao, WJ
作者机构：
[Xiao, WJ; Cao, H] Cent China Normal Univ, Minist Educ, Coll Chem, Key Lab Pesticide & Chem Biol, Wuhan 430079, Hubei, Peoples R China.;[Xiao, WJ] Cent China Normal Univ, Minist Educ, Coll Chem, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Xiao, WJ] C;Cent China Normal Univ, Minist Educ, Coll Chem, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
microwave;palladium;carbonylation;2-iodophenol;chromen-2-one
摘要：
Rapid palladium-catalyzed carbonylative cyclization reactions of 2-iodophenol with various alkynes have been carried out by the use of commercially available molybdenum hexacarbonyl as a convenient and solid carbon monoxide source. The reactions were conducted at 160 °C for 30 min with microwave heating in the presence of DIEA and DMAP in 1,4-dioxane, and afford the corresponding chromen-2-one derivatives in good yields. © 2005 NRC Canada.
语种：
英文
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Highly stereoselective palladium-catalyzed dithiocarbonylation of propargylic mesylates with thiols and carbon monoxide
作者：
Xiao, WJ* ;Alper, H
期刊：
JOURNAL OF ORGANIC CHEMISTRY ,2005年70(5):1802-1807 ISSN：0022-3263
通讯作者：
Xiao, WJ
作者机构：
Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Hubei, Peoples R China.;Univ Ottawa, Dept Chem, Ctr Catalysis Res & Innovat, Ottawa, ON K1N 6N5, Canada.;[Xiao, WJ] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Xiao, WJ] C;Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
摘要：
(Chemical Equation Presented) Highly stereoselective dithiocarbonylation of propargylic mesylates with thiols and carbon monoxide has been developed by the use of tetrakis(triphenylphosphine)palladium(0) as the catalyst at 90 °C in THF. The reaction affords the corresponding dithioesters in good to excellent yields. For some secondary and tertiary propargylic alcohols with a terminal or internal triple bond, the reaction stereoselectively produces E-dithioesters as products. The dithiocarbonylation is believed to proceed via allenylpalladium and allenyl ester intermediates, and the high stereoselectivity might be rationalized by a mechanism where nucleophilic attack of a Pd(0)L<inf>n</inf> species on the allenyl sp carbon occurs from the less hindered side of an alkyl substituent. ©2005 American Chemical Society.
语种：
英文
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A time dependent density functional theory study of alpha-84 phycocyanobilin chromophore in C-phycocyanin
作者：
Wan, J* ;Xu, X;Ren, YL;Yang, GF
期刊：
JOURNAL OF PHYSICAL CHEMISTRY B ,2005年109(22):11088-11090 ISSN：1520-6106
通讯作者：
Wan, J
作者机构：
[Wan, J] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Dept Chem, Wuhan 430079, Peoples R China.;Xiamen Univ, Dept Chem, Ctr Theoret Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China.;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Wan, J] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
摘要：
The optical characteristics of absorption and circular dichroism (CD) spectroscopy of an α-subunit of C-phycocyanin (C-PC) were investigated by using time dependent density functional theory (TDDFT) combined with the polarizable continuum model (PCM). When the protonation of α-84 phycocyanobilin (PCB) and its interaction with the protein moiety in C-PC have been taken into account, satisfactory assignment of the absorption and CD spectra of α-84 PCB can be achieved. The TDDFT-PCM calculations conclude that in the visible absorption region the main peak arises from the n electron excitation of the pyrrole rings and the shoulder peak comes from the charge transfer from Asp87 (a nearby amino acid residue) to PCBH<sup>+</sup>. ©2005 American Chemical Society.
语种：
英文
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In situ growth of epitaxial lead iodide films composed of hexagonal single crystals
作者：
Zheng, Z* ;Liu, AR;Wang, SM;Wang, Y;Li, ZS;...
期刊：
Journal of Materials Chemistry ,2005年15(42):4555-4559 ISSN：0959-9428
通讯作者：
Zheng, Z
作者机构：
[Zheng, Z] Xuchang Univ, Inst Adv Mat, Xuchang 461000, Peoples R China.;Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China.;Nanjing Univ, Dept Phys, Ecomat & Renewable Energy Res Ctr, Jiangsu 210093, Peoples R China.;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构：
[Zheng, Z] X;Xuchang Univ, Inst Adv Mat, Xuchang 461000, Peoples R China.
摘要：
Lead iodide (PbI2) films composed of single crystals with regular hexagonal microstructures have been in situ fabricated on lead foils through a one-step solution-phase chemical route under solvothermal conditions. X-Ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and transmission electron microscopy (TEM) were employed to characterize the resulting PbI2 crystals. The orientation of the hexagonal planes can be controlled via the adjustment of the concentration of iodine and the types of solvents. It is expected to be a simple way for in situ fabricating PbI2 crystals/films for future utilizing in radiation detection.
语种：
英文
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Determination of trace rare earth elements by inductively coupled plasma atomic emission spectrometry after preconcentration with multiwalled carbon nanotubes
作者：
Liang, P* ;Liu, Y;Guo, L
期刊：
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY ,2005年60(1):125-129 ISSN：0584-8547
通讯作者：
Liang, P
作者机构：
[Liu, Y; Liang, P; Guo, L] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
multiwalled carbon nanotubes;preconcentration;rare earth elements;ICP-AES
摘要：
A new method has been developed for the determination of trace rare earth elements (REEs) in water samples based on preconcentration with a microcolumn packed with multiwalled carbon nanotubes (MWNTs) prior to their determination by inductively coupled plasma atomic emission spectrometry (ICP-AES). The optimum experimental parameters for preconcentration of REEs, such as pH of the sample, sample flow rate and volume, elution solution and interfering ions, have been investigated. The studied REEs ions can be quantitatively retained by MWNTs when the pH exceed 3.0, and then eluted completely with 1.0 mol L−1 HNO3. The detection limits of this method for REEs was between 3 and 57 ng L−1, and the relative standard deviations (RSDs) for the determination of REEs at 10 ng mL−1 level were found to be less than 6% when processing 100 mL sample solution. The method was validated using a certified reference material, and has been successfully applied for the determination of trace rare earth elements in lake water and synthetic seawater with satisfactory results.
语种：
英文
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Synthesis and herbicidal activities of methyl-1-(2,4-dichlorophenoxyacetoxy)alkylphosphonate monosalts
作者：
He, HW* ;Wang, T;Yuan, JL
期刊：
Journal of Organometallic Chemistry ,2005年690(10):2608-2613 ISSN：0022-328X
通讯作者：
He, HW
作者机构：
[He, HW; Yuan, JL; Wang, T] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Inst Organ Synth, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[He, HW] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Inst Organ Synth, Wuhan 430079, Hubei, Peoples R China.
会议名称：
16th International Conference on Phosphorus Chemistry
会议时间：
JUL 04-09, 2004
会议地点：
Birmingham, ENGLAND
会议主办单位：
Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Inst Organ Synth, Wuhan 430079, Hubei, Peoples R China.
关键词：
Alkylphosphonate;Monosalt;1-Hydroxyalkylphosphonate;Synthesis;Herbicidal activity
摘要：
A series of 1-(2,4-dichlorophenoxyacetoxy)alkylphosphonic acid dimethyl esters 5 and its corresponding phosphonate monosalts 6 were synthesized as potential herbicide. The phosphonate monosalts can be prepared from 1-(2,4-dichlorophenoxyacetoxy)alkylphosphonic acid dimethyl esters 5, which were synthesized by the condensation of O,O-dimethyl-1-hydroxyalkylphosphonates with dichlorophenoxyacetic chloride. This method provides a simple and efficient procedure for the synthesis of phosphonate derivatives containing sensitive groups to acid, base or water such as carboxylate ester bond; and the herbicidal activity of title compounds was evaluated in a set of experiments in greenhouse. Most of the compounds exhibited notable herbicidal activity.
语种：
英文
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Synthesis and characterization of (CH=CH)(3)-bridged heterobimetallic ferrocene-ruthenium complexes
作者：
Yuan, P;Liu, SH* ;Xiong, WC;Yin, J;Yu, GA;...
期刊：
Organometallics ,2005年24(7):1452-1457 ISSN：0276-7333
通讯作者：
Liu, SH
作者机构：
[Liu, SH] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.;Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Hong Kong, Peoples R China.
通讯机构：
[Liu, SH] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
摘要：
The complex Fc(CH=CH)<inf>2</inf>C≡C-TMS (Fc = ferrocenyl) was obtained from Wittig olefination of FcCH<inf>2</inf>PPh<inf>3</inf>Br with TMS-C≡CCH=CHCHO in THF. The conjugated monometallic diene can be desilylated to give Fc(CH=CH)<inf>2</inf>C≡CH, which reacted with RuHCl(CO)(PPh<inf>3</inf>)<inf>3</inf> to produce Fc(CH=CH)<inf>3</inf>RuCl(CO) (PPh<inf>3</inf>)<inf>2</inf>. Treatment of the latter complex with PMe <inf>3</inf>, 4-phenylpyridine (PhPy), 2,6-(Ph<inf>2</inf>PCH<inf>2</inf>) <inf>2</inf>C<inf>5</inf>H<inf>3</inf>N (PMP), and KTp (Tp = hydridotris(pyrazolyl)borate) gave Fc(CH=CH)<inf>3</inf>RuCl(CO)(PMe <inf>3</inf>)<inf>3</inf>, Fc(CH=CH)<inf>3</inf>RuCl(CO)(PhPy)(PPh <inf>3</inf>)<inf>2</inf>, Fc(CH= CH)<inf>3</inf>RuCl(CO)(PMP), and Fc(CH=CH)<inf>3</inf>RuTp(CO)(PPh<inf>3</inf>), respectively. The structures of Fc(CH=CH)<inf>2</inf>C≡CH and Fc(CH=CH)<inf>3</inf>RuCl(CO)(PMe <inf>3</inf>)<inf>3</inf> have been confirmed by X-ray diffraction. ©2005 American Chemical Society.
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Electrochemical oxidation behavior of nitrite on a chitosan-carboxylated multiwall carbon nanotube modified electrode
作者：
Jiang, LY;Wang, RX;Li, XM;Jiang, LP;Lu, GH*
期刊：
Electrochemistry Communications ,2005年7(6):597-601 ISSN：1388-2481
通讯作者：
Lu, GH
作者机构：
[Lu, GH] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.;Chizhou Teachers Coll, Dept Chem, Guichi 247000, Peoples R China.;Dezhou Coll, Dept Chem, Dezhou 253023, Peoples R China.
通讯机构：
[Lu, GH] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
chitosan;nitrite;multiwall carbon nanotube;electrochemistry;cyclic voltammetry;SPECTROPHOTOMETRIC DETECTION;AMPEROMETRIC DETERMINATION;FLOW-INJECTION;ASCORBIC-ACID;TRACE NITRITE;NITRATE;MICROELECTRODES;REDUCTION;DOPAMINE;SAMPLES
摘要：
A novel chitosan-carboxylated multiwall carbon nanotube modified glassy carbon electrode (MC/GCE) was developed to investigate the oxidation behavior of nitrite using cyclic voltammetry and differential pulse voltammetry modes. The electrochemical mechanism of the MC/GCE towards nitrite was discussed. The MC/GCE exhibited fast response towards nitrite with a detection limit of 1 x 10(-7) Mol l(-1) and a linear range of 5 x 10(-7)-1 x 10(-4) Mol l(-1). The possible interference from several common ions was tested. The proposed method was successfully applied in the detection of nitrite in real samples. (c) 2005 Elsevier B.V. All rights reserved.
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Chemoselective stepwise demetalation of unusually stable Fischer biscarbene complexes by domino [4+2]/[2+2] cycloaddition of 2-isopropenyl-2-oxazoline to 1-alkynyl Fischer carbene complexes of chromium and tungsten
作者：
Chen, JZ;Yu, ZK* ;Zheng, ZY;Gu, KC;Wu, SH;...
期刊：
Organometallics ,2005年24(2):302-308 ISSN：0276-7333
通讯作者：
Yu, ZK
作者机构：
Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Liaoning, Peoples R China.;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.;[Yu, ZK] Chinese Acad Sci, Dalian Inst Chem Phys, 457 Zhongshan Rd, Dalian 116023, Liaoning, Peoples R China.
通讯机构：
[Yu, ZK] C;Chinese Acad Sci, Dalian Inst Chem Phys, 457 Zhongshan Rd, Dalian 116023, Liaoning, Peoples R China.
摘要：
Domino [4+2]/[2+2] cycloaddition of 2-isopropenyl-2-oxazoline 2 to 1-alkynyl Fischer carbene complexes (CO)(5)M=C(OEt)C=CPh 1 (a, M = Cr; b, W) in a 1:2 molar ratio afforded unusually stable biscarbene complexes 3a and 3b containing a novel four-, five-, and six-membered tricyclic core in 99.6% and 45.2% yields, respectively. Chain-opening beta-aminoalkenyl monocarbene complex 4b and beta-amidoalkenyl monocarbene complex 5b of tungsten were also isolated from the cycloaddition upon treatment of the reaction mixture of 1b and 2 on silica gel. Partial and full oxidation of 3a,b with pyridine N-oxide underwent efficient chemoselective stepwise demetalation to afford the corresponding monocarbene complexes 6a,b and organic diester 7, respectively, under mild conditions. The X-ray crystallographic study revealed the presence of a four-, five-, and six-membered tricyclic core in compounds 3, 6, and 7, and the methyl and oxazolindinyl groups derived from oxazoline 2 are positioned syn with respect to the azabicyclo[4.2.0]octadiene bicyclic moiety, which is oriented in the opposite direction. X-ray crystal structural data are reported for the bis- and monocarbene complexes 3a, 5b, and 6b as well as for diester 7.
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Preconcentration of rare earth elements on silica gel loaded with 1-phenyl-3-methyl-4-benzoylpyrazol-5-one prior to their determination by ICP-AES
作者：
Liang, P* ;Chen, XG
期刊：
Analytical Sciences ,2005年21(10):1185-1188 ISSN：0910-6340
通讯作者：
Liang, P
作者机构：
[Chen, XG; Liang, P] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
摘要：
A new chelating resin, silica gel loaded with 1-phenyl-3-methyl-4- benzoylpyrazol-5-one (PMBP), was prepared and used for the preconcentration of trace amounts of rare earth elements (REEs) in water samples prior to their determination by inductively coupled plasma atomic emission spectrometry (ICP-AES). REEs (La, Eu, Yb and Y) were quantitatively retained on the column packed with modified silica gel in the pH range 5-8 and separated from the matrix, and then recovered by eluting with 2.0 mol L-1 HNO 3. The adsorption capacity of modified silica gel for La, Eu, Yb and Y was 0.208, 0.249, 0.239 and 0.224 mmol g-1, respectively. The method has been successfully applied for the determination of La, Eu, Yb and Y in geological and environmental samples with satisfactory results. © The Japan Society for Analytical Chemistry 2005.
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