Copolymerization of norbornene and styrene catalyzed by a series of bis(β-ketoamine) nickel(II) complexes in the presence of methylaluminoxane
作者:
Bao, Feng* ;Lu, Xingqiang;Chen, Ying
期刊:
Polymer Bulletin ,2007年58(3):495-502 ISSN:0170-0839
通讯作者:
Bao, Feng
作者机构:
[Bao, Feng] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.;NW Univ Xian, Dept Chem Engn, Xian 710069, Peoples R China.
通讯机构:
[Bao, Feng] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词:
nickel catalyst;copolymerization;norbornene;styrene;MAO
摘要:
Random copolymerization of norbornene with styrene was studied by using a series of late metal catalysts/MAO. The precatalysts used here are nickel complexes with b-ketoamine ligands based on pyrazolone derivatives. The copolymers obtained here suggest that only one type of active species is present. Copolymers were characterized by <sup>13</sup>C NMR, Gel permeation chromatography (GPC), thermogravimetric analysis (TGA) and FT-IR spectra. The analyses of the product by <sup>1</sup>H NMR and <sup>13</sup>C NMR spectra gave the verification of "true" random vinyl addition copolymer. Varying the monomer feed ratio controlled the composition of the copolymers. A copolymerization reactivity ratio (r<inf>NBE</inf> = 20.35 and r<inf>Sty</inf> = 0.027) indicates a much higher reactivity of norbornene, which suggests a coordination polymerization mechanism. The solubility and processability of the copolymers are improved relative to polynorbornene and the thermostability of the copolymers is improved relative to polystyrene. ©Springer-Verlag 2007.
语种:
英文
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氟代β-二酮化合物的合成及结构表征
作者:
范玲;郑春阳;汪敦佳
期刊:
化学试剂 ,2007年29(8):452-454,476 ISSN:0258-3283
作者机构:
[范玲] 华中师范大学,化学学院;[郑春阳; 汪敦佳] 湖北师范学院
关键词:
β-二酮;三氟甲基;合成;Claisen缩合
摘要:
芳香酮和三氟乙酸乙酯在强碱CH3ONa作用下发生经典Claisen缩合反应,合成了两种未见文献报道的含氟β-二酮:4,4,4-三氟-1-(6-甲氧基-2-萘基)-1,3-二酮和4,4,4-三氟-1-(4-苄氧基苯基)-1,3-二酮.两种氟代β-二酮在氯仿溶液中几乎完全以烯醇式存在,其结构通过红外光谱、核磁氢谱、质谱和元素分析进行了确证.
语种:
中文
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中学生直觉思维能力诊断拾遗
作者:
黎友根
期刊:
中学化学教学参考 ,2007年(6):59-60 ISSN:1002-2201
作者机构:
华中师范大学化学学院;[黎友根] 华中师范大学
关键词:
化合物;直觉思维;诊断分析;中学化学教师;问题解决;中学生;思维能力;化合价;教学过程;综合性
摘要:
<正> 中学化学教师大都有这样的困惑,尽管教学过程精心设计,各个教学环节也自认落实到位,但学生对知识的掌握却不尽如人意。尤其是在一些综合性较强的题目上,学生的得分统计情况反映出来的对知识掌握程度,往往令教师不太满意。研究者发现,做这类题时,很多学生看题、读题不是整体审题,再各个击破,而是亦步亦趋,因此在综合性强的题目面前显得手足无措。其实,有很多综合性较强的题,除了考查学生的基本知识外,还注重学生
语种:
中文
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2-[7-氟-4-(3-碘-丙-2-炔基)-3-氧-3,4-二氢-2H-苯并嗯嗪[b][1,4]-6-基]-4,5,6,7-四氢-2H-异吲哚-1,3-二酮的合成
作者:
庞怀林;黄引;尹笃林;黄明智;阳海
期刊:
化学试剂 ,2007年29(4):232-234 ISSN:0258-3283
作者机构:
湖南师范大学化学化工学院;华中师范大学化学学院;[黄明智] 湖南化工研究院;[阳海; 尹笃林; 庞怀林] 湖南师范大学;[黄引] 华中师范大学
关键词:
2-[7-氟-4-(3-碘-丙-2-炔基)-3-氧-3,4-二氢-2H-苯并嗪[b][1,4]-6-基]-4,5,6,7-四氢-2H-异吲哚-1,3-二酮;丙炔氟草胺;氯化碘;合成;除草剂
摘要:
标题化合物(B2055)是具有较高原卟啉原氧化酶抑制剂除草活性的N-苯基酞酰亚胺类新化合物,合成该化合物的关键步骤是2-[7-氟-4-(丙-2-炔基)-3-氧-3,4-二氢-2H-苯并(噁)嗪[b][1,4]-6-基]-4,5,6,7-四氢-2H-异吲哚-1,3-二酮(丙炔氟草胺,flumioxazin)的碘化.为寻求更经济和可工业化的合成路线,考察了不同的碘化剂、溶剂、原料配比、反应温度及反应时间对丙炔氟草胺的转化率和产品B2055收率的影响,在以醋酸为溶剂,氯化碘为碘化剂,原料丙炔氟草胺与氯化碘的物质的量比为1∶3,反应温度为20 ℃,反应时间为60 min的工艺条件下,原料丙炔氟草胺转化率为92.2%,产品B2055收率为90.7%.
语种:
中文
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和谐教育理念下对化学实验教学的思考
作者:
梁德娟;赖球珠;王星乔
期刊:
双语学习 ,2007年(04):54-55 ISSN:1671-6280
作者机构:
华中师范大学,化学学院,湖北,武汉;[王星乔; 赖球珠; 梁德娟] 华中师范大学
关键词:
和谐;实验;素质;开放实验室;合作
摘要:
自然科学是建立在事实的基础上的学科.实验是自然科学的灵魂,是学生认识自然的窗口.重视实验教育有利于提高学生科学素养,锻炼学生思维能力,开拓学生创新思维,全面提高学生综合素质.因此,实验教学也是新课标着力改革的对象.和谐教育的理念带给实验教学改革新的契机,同时也对其发展提出了更高的要求.
语种:
中文
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席夫碱合钼配合物作用大肠杆菌的微量热研究
作者:
朱立红;郝卫东;叶发兵;黄春保;祝心德
期刊:
湖北农业科学 ,2007年46(6):917-919 ISSN:0439-8114
作者机构:
黄冈师范学院化学与应用化学学院,湖北,黄冈,438000;华中师范大学化学学院,湖北,武汉,430079;[叶发兵; 郝卫东; 黄春保; 朱立红] 黄冈师范学院;[祝心德] 华中师范大学
关键词:
席夫碱;钼(Ⅵ)配合物;微量热学;大肠杆菌
摘要:
用LKB-2277生物活性检测系统测定了两种席夫碱合钼(VI)配合物[MoO2(STZ)2]和[MoO2(VTZ)2]在37℃时对大肠杆菌作用的产热曲线;根据产热曲线求算了在席夫碱合钼(VI)配合物作用下,大肠杆菌生长代谢的速率常数k,抑制率I,传代时间G和半抑制浓度IC50等热力学参数。结果表明,席夫碱合钼(VI)配合物对大肠杆菌有抑制作用,[MoO2(STZ)2](IC50=72.22 mg·L-1)对大肠杆菌的抑制作用优于[MoO2(VTZ)2](IC50=143.57mg·L-1)。
语种:
中文
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N-(4-Azobenzen-yl)-5-norbornene-2,3-dicarboximide
作者:
Tian, Demei;Hu, Bo;Niu, Yongsheng
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(10):o4040-o4040 ISSN:2053-2296
通讯作者:
Tian, D.
作者机构:
Wuhan Univ Technol, Sch Mat & Technol, Wuhan 430070, Peoples R China.;Cent China Normal Univ, Coll Che, Wuhan 430079, Hubei, Peoples R China.;Anyang Inst Technol, Dept Chem Engn, Anyang 455000, Henan, Peoples R China.;[Tian, Demei] School of Material and Technology, Wuhan University of Technology, Wuhan, Hubei 430070, China, College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, China;[Hu, Bo] College of Chemistry, Central China Normal University, Wuhan, Hubei 430079, China
通讯机构:
[Tian, D.] S;School of Material and Technology, Wuhan University of Technology, China
摘要:
The title compound, C21H17N3O2, is a norbornene derivative containing an azo group which is disordered over two sites in an approximate 2:1 ratio. The two aromatic rings are almost coplanar [dihedral angle 9.25 (10)°]. The crystal packing is stabilized by an inter-molecular C - H⋯O hydrogen bond. © International Union of Crystallography 2007.
语种:
英文
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1-{6-(4-Chlorophenyl)-1-[(6-chloropyridin-3-yl)methyl]-2-[(6-chloropyridin- 3-yl)methylsulfanyl]-4-methyl-1,6-dihydropyrimidin-5-yl}ethanone
作者:
Zhu, Xiao-Fei;Shi, De-Qing*
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(5):o2506-o2507 ISSN:2053-2296
通讯作者:
Shi, De-Qing
作者机构:
[Zhu, Xiao-Fei; Shi, De-Qing] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Hubei, Peoples R China.
通讯机构:
[Shi, De-Qing] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticides & Chem Biol, Wuhan 430079, Hubei, Peoples R China.
摘要:
In the title compound, C25H21Cl3N4OS, mol-ecules are linked into centrosymmetric pairs by C - H⋯O inter-actions. C - H⋯Cl inter-actions link these pairs into a three-dimensional network. © 2007 International Union of Crystallography. All rights reserved.
语种:
英文
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中学化学教学中的探究性实验
作者:
丁志兵
期刊:
中小学实验与装备 ,2007年17(3):43-44 ISSN:1673-6869
作者机构:
华中师范大学化学学院,430079;[丁志兵] 华中师范大学
关键词:
中学化学教学;探究性实验;化学实验教学;探究性学习;科学探究活动;著名教育家;实践活动;化学问题
摘要:
化学实验是学生积极主动地应用已掌握的化学知识解决化学问题的重要实践活动。“学生的学习取决于他自己做了些什么,而不是教师做了些什么”。这是美国著名教育家、课程专家泰勒的名言。这句话指出了学生学的本质在于探究。将探究性学习引入化学实验教学,可以让学生亲身体验科学探究活动,激发他们学习化学的兴趣。在利用探究式学习法进行化学实验时,教师应注意以下问题:
语种:
中文
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Poly[(μ2-2,2′-bi-1H-imidazole)bis-(μ3- hydrogenphosphato)dizinc(II)]
作者:
Cao, Min-Na;Wang, Min;Luo, Fei-Hua;Cheng, Cui-Xia;Hu, Zong-Qiu*
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(10):m2456-m2456 ISSN:2053-2296
通讯作者:
Hu, Zong-Qiu
作者机构:
[Hu, Zong-Qiu; Wang, Min; Hu, ZQ; Luo, Fei-Hua; Cao, Min-Na; Cheng, Cui-Xia] Cent China Normal Univ, Dept Chem, Wuhan 430079, Hubei, Peoples R China.
通讯机构:
[Hu, Zong-Qiu] C;Cent China Normal Univ, Dept Chem, Wuhan 430079, Hubei, Peoples R China.
摘要:
The ZnII ion in the title compound, [Zn2(HPO4)2(C6H6N4)], exhibits a tetra-hedral geometry. It is coordinated by three O atoms from three hydrogenphosphate ions of three different structure units and one N atom of a centrosymmetric bridging 2,2′-biimidazole mol-ecule. In this way, a three-dimensional polymer is built. The crystal packing is stabilized by O - H⋯O, N - H⋯O and C - H⋯O hydrogen bonds. © International Union of Crystallography 2007.
语种:
英文
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[μ-10,21-Difluoro-3,6,14,17-tetrazatricyclo[17.3.1.18,12] tetra-cosa-1(23),2,6,8,10,12(24),13,17,19,21-deca-ene-23,24-diolato- κ4 N 3,N 6,O 23,O 24:κ4 N 14,N 17,O 23,O 24]bis-[methano-lcopper(II)] bis-(perchlorate)
作者:
Bai, Jun-Lin;Zhou, Hong;Pan, Zhi-Quan* ;Meng, Xiang-Gao
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(11):m2641-m2641 ISSN:2053-2296
通讯作者:
Pan, Zhi-Quan
作者机构:
[Pan, Zhi-Quan] Wuhan Inst Technol, Hubei Key Lab Novel Chem Reactor & Green Chem Tec, Wuhan 430073, Peoples R China.;Cent China Normal Univ, Dept Chem, Wuhan 430079, Peoples R China.
通讯机构:
[Pan, Zhi-Quan] W;Wuhan Inst Technol, Hubei Key Lab Novel Chem Reactor & Green Chem Tec, Wuhan 430073, Peoples R China.
摘要:
The title complex, [Cu2(C20H16F2N4O2)(CH4O)2](ClO4)2, was synthesized by cyclo-condensation between ethyl-enediamine and 2,6-diformyl-4-fluoro-phenol in the presence of CuII ions. This dinuclear copper complex is centrosymmetric. Both Cu atoms are in a distorted tetra-hedral geometry, coordinated by three O atoms and two N atoms. The two Cu atoms are bridged by two endogenous phenol O atoms, with a Cu⋯Cu distance of 2.8998 (7) Å. In the crystal structure, the perchlorate ions link the macrocycles through inter- and intra-molecular hydrogen bonds. © International Union of Crystallography 2007.
语种:
英文
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2-[1-(4,6-Dimethoxypyrimidin-2-yl)-1H-pyrazol-3-yl]phenol
作者:
Li, Yuan-Xiang* ;Wang, Ya-Zhou
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(2):o873-o874 ISSN:2053-2296
通讯作者:
Li, Yuan-Xiang
作者机构:
[Li, Yuan-Xiang; Li, YX; Wang, Ya-Zhou] Cent China Normal Univ, Key Lab Pesticides & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构:
[Li, Yuan-Xiang] C;Cent China Normal Univ, Key Lab Pesticides & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
摘要:
In the crystal structure of the title compound, C 15 H 14 N 4 O 3 , there are an intramolecular O-H⋯N hydrogen bond and intermolecular π-π stacking interactions. © 2007 International Union of Crystallography All rights reserved.
语种:
英文
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Selective adsorption and recognition by molecularly imprinted polymer: A study on molecular self-assembly and its effect on selectivity
作者:
Liao, Tangbin;Tu, Xin;Li, Songjun*
期刊:
Polymer-Plastics Technology and Materials ,2007年46(6):613-619 ISSN:2574-0881
通讯作者:
Li, Songjun
作者机构:
[Liao, Tangbin; Li, Songjun; Tu, Xin] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构:
[Li, Songjun] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词:
Adsorption;Molecularly imprinting polymer;Self-assembly;Selectivity
摘要:
This article presents an interesting study on the molecular self-assembly and its effect on selective recognition by molecularly imprinted polymers. With theophylline as template and methylacrylic acid as functional monomer, the self-assembly appears to play important roles in the selective adsorption, affecting not only the adsorption amount but also the cognitive selectivity. Both of them become evident by the change of monomer-template ratio. An increase in the monomer-template ratio will result in a higher level of adsorption. The best selectivity for molecular recognition is, however, shown at the optimal constitute (corresponding to the saturation interaction of monomer and template). A higher or lower monomer-template ratio leads to a dramatic decrease in this selectivity. Related information indicates that this may be a result from the matched arrangement between binding sites and template, which makes the binding sites capable of selectively recognizing the imprint species. Preliminarily, this study presents an insight into the understanding of molecular recognition by imprinted polymers.
语种:
英文
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MOLECULAR DOCKING OF SUBSTITUTED ALKYLPHOSPHONATES TO PYRUVATE DEHYDROGENASE
作者:
Hao peng;Hong-Wu He
作者机构:
[Hao peng; Hong-Wu He] Key Laboratory of Pesticide and Chemical Biology,Ministry of Education;[Hao peng; Hong-Wu He] College of Chemistry,Central China Normal University,Wuhan 430079,China
会议名称:
第17届国际磷化学学术会议(The 17th International Conference on Phosphorus Chemistry)
会议时间:
2007-4-15
会议地点:
厦门
会议主办单位:
中国化学会
会议论文集名称:
第17届国际磷化学学术会议(The 17th International Conference on Phosphorus Chemistry)论文集
语种:
英文
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Chlorido[N,N,N′,N′-tetra-kis-(benz-imidazol-2-ylmeth-yl) ethane-1,2-diamine]manganese(II) chloride monohydrate
作者:
Pei, Ya-Mei;Zhou, Chun-Shan;Meng, Xiang-Gao;Wang, Li* ;Liu, Chang-Lin
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(6):m1571-m1572 ISSN:2053-2296
通讯作者:
Wang, Li
作者机构:
[Meng, Xiang-Gao; Wang, Li; Pei, Ya-Mei; Wang, L; Zhou, Chun-Shan; Liu, Chang-Lin] Cent China Normal Univ, Dept Chem, Key Lab Pestricides & Chem Biol, Wuhan 430079, Hubei, Peoples R China.
通讯机构:
[Wang, Li] C;Cent China Normal Univ, Dept Chem, Key Lab Pestricides & Chem Biol, Wuhan 430079, Hubei, Peoples R China.
摘要:
In the title compound, [MnCl(C34H32N10)]Cl·H2O, the MnII ion is in a distorted octa-hedral coordination environment. The crystal structure is stabilized by extensive hydrogen bonding. © International Union of Crystallography 2007.
语种:
英文
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Diaqua-[(N,N′-dibenzyl-ethane-1,2-diyldiimino)diacetato]cadmium(II) 2.5-hydrate
作者:
Zhang, Min;Wumaierjiang, Aimaiti;Meng, Xianggao;Xu, Xingman*
期刊:
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2007年63(12):m3121-m3122 ISSN:2053-2296
通讯作者:
Xu, Xingman
作者机构:
[Xu, Xingman] Cent China Normal Univ, Dept Chem, Wuhan 430079, Peoples R China.;Kashigar Teacher Coll, Dept Life & Environm Sci, Xinjiang 844007, Peoples R China.
通讯机构:
[Xu, Xingman] C;Cent China Normal Univ, Dept Chem, Wuhan 430079, Peoples R China.
摘要:
In the asymmetric unit of the title compound, [Cd(C20H22N2O4)(H2O)2] ·2.5H2O, there are five water molecules and two independent mononuclear complex mol-ecules in which the CdII ions are in distorted octa-hedral coordination environments, defined by N2O4 donor sets. In the crystal structure, extensive hydrogen bonding links mol-ecules into one-dimensional chains along the b axis. © International Union of Crystallography 2007.
语种:
英文
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药物核磁共振定量分析参数的研究
作者:
张友杰;刘小鹏
期刊:
波谱学杂志 ,2007年24(3):289-295 ISSN:1000-4556
作者机构:
[张友杰] 武汉生物工程学院,分析测试中心;[刘小鹏] 华中师范大学,分析测试中心
关键词:
核磁共振;定量分析;药物;核磁共振参数;维生素C
摘要:
药物核磁共振定量分析已见诸多篇报道.英、美、欧药典中都先后引入了核磁共振分析方法.本文对药物核磁共振定量分析的参数作了较为详尽的研究,提出了选择定量特征峰的新标准.经维生素C实际样品测定其精密度优于1%,结果满意.
语种:
中文
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Rationally designing molecularly imprinted polymer toward a high specific adsorbent by using metal as assembled pivot
作者:
Zheng, Ming-Xia;Li, Song-Jun* ;Luo, Xuan
期刊:
JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY ,2007年44(11):1187-1194 ISSN:1060-1325
通讯作者:
Li, Song-Jun
作者机构:
[Li, Song-Jun; Luo, Xuan; Zheng, Ming-Xia] Cent China Normal Univ, Minist Educ, Coll Chem, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构:
[Li, Song-Jun] C;Cent China Normal Univ, Minist Educ, Coll Chem, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词:
molecularly imprinted polymer;adsorption;metal;assembled pivot
摘要:
This article presents an original work aimed at rationally designing molecularly imprinted polymer (MIP) toward a high specific adsorbent. Assembling with cobalt as the pivot, the MIP was prepared by coordinating polymerizable monomers around an inducible template. The use of pivot obviously plays a positive role on increasing the specificity of MIP, so as to adsorb more for the template and less for its analogue. Related studies indicate that these may be a result of increasing specific interaction, which makes the MIP capable of recognizing the imprint species. Further information from thermodynamic analysis reveals that the increasing specific interaction, in logic, can be due to a higher fidelity of imprint, which specifically allures the template to bind.
语种:
英文
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Fe/ACF电极阴极电催化降解RhB的研究
作者:
张礼知;艾智慧;贾法龙;李金坡
作者机构:
[张礼知; 艾智慧; 贾法龙; 李金坡] 华中师范大学化学学院农药与化学生物学教育部重点实验室
会议名称:
第五届全国环境催化与环境材料学术会议
会议时间:
2007-07
会议地点:
中国山东烟台
关键词:
电催化;Fe/ACF电极
摘要:
<正>图1a,b,c表明Fe与铁的氧化物在ACF的纤维管的外壁上可以很好的分散。通过EDX的分析可以看到在炭纤维的细纤维上的颗粒物为铁单质和铁的氧化物。本实验室自制的铁可以很好催化降解有机物,2个小时的降解90%。明显高于商品还原铁粉的74.5%的降解效果(图2)。从图3中可以看出,自制的电极可以在pH较广泛的条件下使用。
语种:
中文
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