Electrocatalytic reduction and determination of p-nitrophenol on acetylene black paste electrode coated with salicylaldehyde-modified chitosan
作者:
Deng, Peihong* ;Xu, Zhifeng;Feng, Yonglan;Li, Junhua
期刊:
Sensors and Actuators B-Chemical ,2012年168:381-389 ISSN:0925-4005
通讯作者:
Deng, Peihong
作者机构:
[Deng, Peihong; Xu, Zhifeng; Li, Junhua; Feng, Yonglan] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构:
[Deng, Peihong] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词:
p-Nitrophenol;Salicylaldehyde-modified chitosan;Acetylene black paste electrode;Voltammetric determination
摘要:
A novel method has been developed for the determination of p-nitrophenol (p-NP), which was based on the enhanced electrochemical response of p-NP at an acetylene black paste electrode coated with salicylaldehyde-modified chitosan (denoted as S-CHIT/ABPE). In 0.2 mol L−1 HCl solution, p-NP yielded a sensitive reduction peak at −0.348 V. Compared with the poor response at conventional carbon paste electrode, S-CHIT/ABPE remarkably increased the peak current of p-NP. All the experimental conditions, which influence the electrochemical response of p-NP, were studied and the optimum conditions were achieved. Finally, a sensitive and simple voltammetric method with a good linear relationship in the range of 8.0 × 10−8 mol L−1 to 2.0 × 10−6 mol L−1 was developed for the determination of p-NP. The detection limit (S/N = 3) was also examined and a low value of 3.0 × 10−8 mol L−1 for 120 s accumulation was obtained. The method has been successfully applied to the determination of p-NP in water samples with good recovery in the range of 96–104%.
语种:
英文
展开
Boronic Acid Terminated Thermo-Responsive and Fluorogenic Polymer: Controlling Polymer Architecture for Chemical Sensing and Affinity Separation
作者:
Xu, Zhifeng;Uddin, Khan Mohammad Ahsan;Ye, Lei*
期刊:
MACROMOLECULES ,2012年45(16):6464-6470 ISSN:0024-9297
通讯作者:
Ye, Lei
作者机构:
[Uddin, Khan Mohammad Ahsan; Xu, Zhifeng; Ye, Lei] Lund Univ, Div Pure & Appl Biochem, S-22100 Lund, Sweden.;[Xu, Zhifeng] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Xu, Zhifeng] Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.;[Ye, Lei] Lund Univ, Div Pure & Appl Biochem, Box 124, S-22100 Lund, Sweden.
通讯机构:
[Ye, Lei] L;Lund Univ, Div Pure & Appl Biochem, Box 124, S-22100 Lund, Sweden.
摘要:
Thermo-responsive poly(N-isopropylacrylamide) (polyNIPAm) containing terminal boronic acid was synthesized using atom transfer radical polymerization (ATRP) in combination with Cu(I)-catalyzed alkyne-azide 1,3-dipolar cycloaddition (CuAAC) reaction. Alkyne-terminated polyNIPAm was first synthesized by ATRP using an alkyne-containing initiator. A fluorogenic boronic acid, 3-(2-azido-acetylamino)phenylboronic acid (APBA) was then linked to the polyNIPAm through CuAAC. The synthesized polymers were characterized by <sup>1</sup>H NMR, FT-IR, UV-vis, matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, and turbidity measurements. The intensity of fluorescence emission of the boronic acid-terminated polyNIPAm (BA-polyNIPAm) was found to increase when increasing amount of a cis-diol compound (i.e., fructose) was added. At physiological pH value, the BA-polyNIPAm effectively bound fructose and could be easily separated from aqueous solution by raising the temperature above its lower critical solution temperature (LCST). ©2012 American Chemical Society.
语种:
英文
展开
二正丁基锡邻甲基水杨酸酯配合物的合成、结构及量子化学研究
作者:
Zhang Fu-Xing* ;Wang Jian-Qiu;Kuang Dai-Zhi;Feng Yong-Lan;Xu Zhi-Feng;...
期刊:
无机化学学报 ,2012年28(6):1195-1199 ISSN:1001-4861
通讯作者:
Zhang Fu-Xing
作者机构:
[Zhang Fu-Xing] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;Hengyang Normal Univ, Key Lab Funct Organometall Mat, Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Zhang Fu-Xing] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词:
二正丁基锡邻甲基水杨酸酯;合成;晶体结构;从头计算
摘要:
二正丁基氧化锡和邻甲基水杨酸按物质的量比1∶1反应,合成了二正丁基锡邻甲基水杨酸酯配合物{[n-Bu_2Sn(O_2CC_6H_3OHCH_3)]_2O}2。经X-射线衍射方法测定了其晶体结构,配合物属单斜晶系,空间群为P2_1/c,晶体学参数a=2.436 89(10)nm,b=1.909 58(8)nm,c=1.632 04(7)nm,β=107.467 0(10)°,V=7.244 4(5)nm~3,Z=4,D_c=1.438 g.cm~(-3),μ(Mo Kα)=14.19 cm~(-1),F(000)=3 184,R_1=0.034 7,wR_2=0.084 7。晶体中每一个结构基元包含了2个结构相同而空间取向不同的以Sn2O_2构成的平面四元环为中心环的双核结构分子,锡原子均为五配位的畸变三角双锥构型。对其结构进行量子化学从头计算,探讨了配合物的稳定性、分子轨道能量以及部分前沿分子轨道的组成特征。
语种:
中文
展开
一维链状三苯基锡肉桂酸酯配合物的合成、结构及量子化学研究
作者:
Zhang Fu-Xing* ;Wang Jian-Qiu;Kuang Dai-Zhi;Feng Yong-Lan;Zhang Zhi-Jian;...
期刊:
无机化学学报 ,2011年27(8):1591-1595 ISSN:1001-4861
通讯作者:
Zhang Fu-Xing
作者机构:
[Feng Yong-Lan; Kuang Dai-Zhi; Zhang Fu-Xing; Xu Zhi-Feng; Zhang Ke; Wang Jian-Qiu] Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organametall Mat, Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.;[Zhang Zhi-Jian] Hengyang Normal Univ, Dept Life Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Zhang Fu-Xing] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organametall Mat, Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
关键词:
三苯基锡肉桂酸酯;合成;晶体结构;从头计算
摘要:
三苯基氯化锡与肉桂酸按物质的量比1∶1在苯和乙醇混合溶剂中反应合成了一维链状三苯基锡肉桂酸酯。经X-射线衍射方法测定了其晶体结构,配合物属单斜晶系,空间群为P2_1/c,晶体学参数a=1.281 28(9)nm,b=1.145 90(8)nm,c=1.829 01(4)nm,β=120.784(4)°,V=2.307 0(3)nm~3,Z=4,D_c=1.431 g.cm~(-3),μ(Mo Kα)=11.27 cm~(-1),F(000)=1 000,R_1=0.025 2,wR_2=0.058 0。配合物通过肉桂酸羧基桥联,形成五配位的三角双锥构型的链状结构。对其结构进行量子化学从头计算,探讨了配合物的稳定性、分子轨道能量以及一些前沿分子轨道的组成特征。
语种:
中文
展开
微波固相合成三(邻氯苄基)锡肉桂酸酯及其结构与量子化学研究
作者:
Zhang Fu-Xing* ;Wang Jian-Qiu;Kuang Dai-Zhi;Feng Yong-Lan;Zhang Zhi-Jian;...
期刊:
无机化学学报 ,2011年27(6):1111-1115 ISSN:1001-4861
通讯作者:
Zhang Fu-Xing
作者机构:
[Feng Yong-Lan; Kuang Dai-Zhi; Zhang Fu-Xing; Xu Zhi-Feng; Zhang Ke; Wang Jian-Qiu] Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organomet Mat, Dept Chem & Mat Sci, Hengyang 421008, Human, Peoples R China.;[Zhang Zhi-Jian] Hengyang Normal Univ, Dept Life Sci, Hengyang 421008, Human, Peoples R China.
通讯机构:
[Zhang Fu-Xing] H;Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organomet Mat, Dept Chem & Mat Sci, Hengyang 421008, Human, Peoples R China.
关键词:
微波固相合成;三(邻氯苄基)锡肉桂酸酯;晶体结构;从头计算
摘要:
三(邻氯苄基)氯化锡与肉桂酸按物质的量比1:1,通过微波固相反应合成了三(邻氯苄基)锡肉桂酸酯。经X一射线衍射方法测定了其晶体结构,化合物属三斜晶系,空间群为P1,晶体学参数a=0.974 91(3)nm,b=1.09657(3)nm,c=1.485 91(4)./1//1,d= 104.1150(10)°,/3=90.241 0(10)°,r=111.7150(10)°。,V=I.423 35(7)nm~3,Z=2,D_c=1.499 g·cm~(-3),μ(Mo K00=12.04 crn一,F(000)=644,R1_ 0.0249,wR_2=0.0836。中心锡与亚甲基碳和羧基氧原子构成畸型四面体。对其结构进行量子化学从头计算,探讨了配合物的稳定性、分子轨道能量以及一些前沿分子轨道的组成特征。
语种:
中文
展开
Study on Synthesis, Crystal Structure and Quantum Chemistry of the Tribenzyltin Iodized
作者:
Wang Jian-Qiu;Zhang Fu-Xing;Kuang Dai-Zhi* ;Feng Yong-Lan;Zhang Zhi-Jian;...
期刊:
无机化学学报 ,2011年27(3):487-490 ISSN:1001-4861
通讯作者:
Kuang Dai-Zhi
作者机构:
[Chen Yan-Wei; Feng Yong-Lan; Kuang Dai-Zhi; Zhang Fu-Xing; Xu Zhi-Feng; Wang Jian-Qiu] Hengyang Normal Univ, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Zhang Zhi-Jian] Hengyang Normal Univ, Dept Life Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Kuang Dai-Zhi] H;Hengyang Normal Univ, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词:
三苄基碘化锡;合成;晶体结构;量子化学
摘要:
三苄基氯化锡与碘乙酸在苯溶剂中反应,合成了三苄基碘化锡。经X射线衍射方法测定了化合物的晶体结构。该晶体属三方晶系,空间群R3,晶体学参数a=1.6891(2)nm,b=1.6891(2)nm,c=0.60371(12)nm,γ=120°,Z=3,V=1.4917(4)nm3,Dc=1.733g.cm-3,μ(Mo Kα)=2.835 mm-1,F(000)=750,R1=0.072 2,wR2=0.171 2。中心锡与亚甲基碳和碘原子构成畸型四面体。对其结构进行量子化学从头计算,探讨了化合物的稳定性、分子轨道能量以及一些前沿分子轨道的组成特征。
语种:
中文
展开
碳纳米管上分子印迹微反应器的构建及催化Diels-Alder反应研究
作者:
Xu Zhi-Feng* ;Wen Ge;Kuang Dai-Zhi;Zhang Fu-Xing;Wang Jian-Qiu;...
期刊:
高等学校化学学报 ,2011年32(5):1157-1162 ISSN:0251-0790
通讯作者:
Xu Zhi-Feng
作者机构:
[Kuang Dai-Zhi; Xu Zhi-Feng; Zhang Fu-Xing; Li Jun-Hua; Wang Jian-Qiu] Hengyang Normal Univ, Dept Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Wen Ge] Hengyang Chinese Med Corp Ltd, Unisplendour Guban Grp, Hengyang 421003, Peoples R China.
通讯机构:
[Xu Zhi-Feng] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.
关键词:
分子印迹微反应器;多壁碳纳米管;Diels-Alder环加成;催化
摘要:
通过多壁碳纳米管(MWCNTs)上羟基的酯化反应在碳纳米管表面接枝双键,以蒽和马来酸的加成反应产物为模板分子,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EDMA)为交联剂,通过微波辐射聚合在碳纳米管表面接枝一层厚度约为30 nm的分子印迹催化剂.该催化剂对蒽和马来酸的加成反应具有明显的催化作用,反应开始后的180 min内,催化反应速率是不加催化剂反应速率的1.77倍.该催化反应的催化动力学遵守Michaelis-Menten方程,最大速率(v_(max))为0.713μmol/(L·s),米氏常数(K_M)为 17735.24μmol/L.
语种:
中文
展开
刚果红与β-环糊精及其衍生物的包合物与DNA的作用研究(英文)
作者:
唐斯萍;曾朵清;黄耿;冯泳兰;许志锋;...
期刊:
衡阳师范学院学报 ,2011年32(06):74-78 ISSN:1673-0313
作者机构:
湖南省普通高等学校功能金属有机材料重点实验室,湖南衡阳421008;衡阳师范学院化学与材料科学系,湖南衡阳421008;衡阳师范学院化学与材料科学系,湖南衡阳,421008;[庾江喜; 冯泳兰; 黄耿; 唐斯萍; 许志锋] 湖南省普通高等学校;[曾朵清] 衡阳师范学院
关键词:
β-环糊精;刚果红;包合物;小牛胸腺DNA
摘要:
用荧光光谱法、紫外-可见分光光度法在生理条件下(pH-7.41)研究了β-环糊精(β-CD)、6-去氧-(N-胺乙基)环糊精(CR—β—CDen)分别与刚果红(CR)的包合作用;研究了CR,(CR—β—CD)和(CR—p—CDen)超分子体系与小牛胸腺DNA的相互作用。紫外滴定实验结果表明:(1)β-环糊精和6-去氧-(N-胺乙基)环糊精都与客体分子刚果红发生超分子作用;(2)CR,CR—pCD,CR-β-CDen与小牛胸腺DNA作用的结合常数Kb值分别为4.1×10^4L/mol,1.36×10^5L/mol,2.33×10^5L/mol,表明超分子体系CR-β-CDen与DNA的相互作用最强。荧光实验结果表明三种化合物CR,CR—β—CD,CR-β-CDen的荧光强度随着CT—DNA的增加而增大,其中环糊精衍生物CR—β—CDen荧光增强效果是最好的。
语种:
中文
展开
亚洲韧皮杆菌兼性厌氧型伴生细菌鉴定及优势菌群分析
作者:
邝代治;冯泳兰;张复兴;王剑秋;许志锋;...
期刊:
微生物学通报 ,2011年25(9):1362-1370 ISSN:0253-2654
作者机构:
重庆大学生物工程学院基因工程研究中心;[王玉玺] 农业部全国农业技术推广服务中心;[陈世伟] 广西利添生物科技发展(合浦)有限公司;[李颜方; 殷幼平; 李佳; 王中康] 重庆大学
关键词:
黄龙病;内生细菌;定向分离培养;16SrRNA多样性分析
摘要:
以定向分离培养和基于16S rDNA的PCR-DGGE (Denaturing gradient gel electrophoresis,DGGE)方法,分析感黄龙病柑橘与健康柑橘植株不同部位的内生细菌多样性,分离柑橘组织共获得19株可培养的兼性厌氧型内生细菌,经形态、生理生化结合16S rDNA分子方法鉴定其隶属于12个属,其中短小杆菌属Curtobacterium sp.(IF:29.07%)、芽孢杆菌属Bacillus sp.(IF:23.12%)和微杆菌属Microbacterium sp.(IF:21.09%)为罹病植株的优势菌群,芽孢杆菌属Bacillus sp.(IF:21.03%)、动性球菌属Planococcus sp.(IF:20.69%)和假单胞菌属Pseudomonas sp.(IF:17.44%)为无症健株的优势茵群.对DGGE方法得到的50务16S rDNA目标条带进行序列比对,共鉴定出9个属的细菌,结果表明沙雷氏菌属Serrations sp.(IF:28%)是优势茵属,泛菌属Pantoea sp.(IF:14%)是次优势菌属;病果桔络中黄龙病菌含量最高(>1%),而罹病植株其他部位的黄龙病菌丰度较低.PCR-DGGE图谱也显示感病和健康柑橘组织的内生细菌存在差异.
语种:
中文
展开
胆酸印迹聚合物的制备及在含水介质中的结合性能
作者:
Xu Zhi-Feng* ;Kuang Dai-Zhi;Wen Ge;Zhang Fu-Xing;Wang Jian-Qiu;...
期刊:
高等学校化学学报 ,2011年32(8):1727-1732 ISSN:0251-0790
通讯作者:
Xu Zhi-Feng
作者机构:
[Kuang Dai-Zhi; Xu Zhi-Feng; Zhang Fu-Xing; Li Jun-Hua; Wang Jian-Qiu] Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Wen Ge] Hengyang Chinese Med Corp Ltd, Unisplendour Guhan Grp, Hengyang 421003, Peoples R China.
通讯机构:
[Xu Zhi-Feng] H;Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词:
分子印迹;胆酸;β-环糊精;特异性结合;疏水作用
摘要:
以双甲基丙烯酰-β-环糊精(BMA-β-CD)和2-(二乙基胺基)乙基甲基丙烯酸酯(DEAEM)为功能单体制备了胆酸印迹聚合物 MIP_1,并采用平衡结合实验研究了 MIP_1在含水介质中对模板分子的识别能力.结果表明,MIP_1比单独以 BMA-β-CD 或 DEAEM 为功能单体制备的印迹聚合物 MIP_2和 MIP_3显示出对模板分子更好的选择性结合能力.MIP_1的特异性吸附量(Δc_P)为38.81 μmol/g,印迹因子 IF 为2.46.研究结果表明,在含水介质中,利用模板分子与功能单体之间的疏水作用和离子作用是提高印迹聚合物分子识别能力的关键.另外,在识别过程中,疏水作用在驱动分子进入印迹孔穴时起重要作用.
语种:
中文
展开
三苯基锡2-噻吩甲酸酯的微波固相合成、结构及量子化学研究
作者:
张复兴;邝代治;王剑秋;冯泳兰;许志锋;...
期刊:
衡阳师范学院学报 ,2011年32(06):64-69 ISSN:1673-0313
作者机构:
衡阳师范学院化学与材料科学系,湖南衡阳421008;功能金属有机材料湖南省普通高等学校重点实验室,湖南衡阳421008;衡阳师范学院化学与材料科学系,湖南衡阳,421008
关键词:
微波固相合成;三苯基锡2-噻吩甲酸酯;从头计算
摘要:
三苯基氯化锡与2-噻吩甲酸钠按物质的量比1∶1,通过微波固相合成法合成了三苯基锡2-噻吩甲酸酯。经X-射线衍射方法测定了其晶体结构,配合物属单斜晶系,空间群为P21/c,晶体学参数a=1.340 22(6)nm,b=1.800 2(6)nm,c=1.452 87(6)nm,β=118.983(3)°,V=2.009 94(16)nm3,Z=4,Dc=1.577g/cm3,μ(MoKa)=13.90cm-1,F(000)=952,R1=0.026 4,wR2=0.068 2。中心锡与亚甲基碳和氧原子构成畸型四面体。对其结构进行量子化学从头计算,探讨了配合物的稳定性、分子轨道能量以及一些前沿分子轨道的组成特征。
语种:
中文
展开
二茂铁甲酸分子印迹聚合物的制备、识别机理和结合特性
作者:
许志锋;吴双;吴小辉;邝代治;张复兴;...
期刊:
应用化学 ,2010年27(4):384-389 ISSN:1000-0518
作者机构:
衡阳师范学院化学与材料科学系,功能金属有机材料湖南省普通高等学校重点实验室,衡阳,421008;[吴双; 邝代治; 王剑秋; 吴小辉; 张复兴; 许志锋] 功能金属有机材料湖南省普通高等学校
关键词:
分子印迹;二茂铁甲酸;甲基丙烯酸;分子识别
摘要:
以二茂铁甲酸(FCA)为模板,选用不同的功能单体制备了一系列分子印迹聚合物,用平衡结合实验考察了它们对模板分子的结合性能.结果表明,以甲基丙烯酸为功能单体制得的印迹聚合物P_1对模板分子有很好的选择性,特异性吸附量ΔC_P为23.18 μmol/g,印迹因子IF为2.33,竞争性结合实验结果表明,P_1可以将模板分子从结构类似物中分离出来.Scatchard方程研究表明,在研究的浓度范围内聚合物中形成了一类等价的结合位点,其对模板分子的平衡离解常数K=1.94 mmol/L,最大表观结合量C_(pmax)=92.33 μmol/g.研究还表明,FCA的羧基是在聚合物的孔穴中产生识别位点的功能基,模板分子上的羧基与MAA的羧基形成双重氢键作用是分子识别的主要作用力.
语种:
中文
展开
Synthesis, Crystal Structure and Quantum Chemistry of Dibutyltin 3,4-Dimethoxybenzotate Compound
作者:
Zhang Fu-Xing* ;Wang Jian-Qiu;Kuang Dai-Zhi;Feng Yong-Lan;Xu Zhi-Feng;...
期刊:
Chinese Journal of Structural Chemistry ,2010年29(10):1529-1535 ISSN:0254-5861
通讯作者:
Zhang Fu-Xing
作者机构:
[Feng Yong-Lan; Kuang Dai-Zhi; Zhang Fu-Xing; Xu Zhi-Feng; Zhang Ke; Wang Jian-Qiu] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Feng Yong-Lan; Kuang Dai-Zhi; Zhang Fu-Xing; Xu Zhi-Feng; Wang Jian-Qiu; Zhang Zhi-Jian] Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Zhang Fu-Xing] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词:
3,4-dimethoxybenzoic acid;Ab initio method;Crystal structure;Dibutyltin;Synthesis
摘要:
The dibutyltin 3,4-dimethoxybenzotate compound {[(3,4-(CH3O)2C6H3COO) Sn(Bu-n)2]2O}2 has been synthesized by the reaction of dibutyltin oxide with 3,4-dimethoxybenzoic acid. Its structure was determined by X-ray single-crystal diffraction. The crystal belongs to the triclinic system,space group P1 with a = 1.2003(2),b = 1.2821(3),c = 1.3666(3) nm,α = 80.50(3),β = 65.56(3),γ = 73.36(3)°,Z = 2,V = 1.8318(6) nm3,Dc = 1.530 Mg·m-3,μ(MoKa) = 1.413 mm-1,F(000) = 860,R = 0.0554 and wR = 0.1092. In the complex,each tin atom adopts a distorted tigonal bipyramidal structure,and the dimer structure is shaped by one Sn2O2 planar four-membered ring. The stabilities of the title complex,along with its orbital energies and composition characteristics of some frontier molecular orbitals have been investigated by means of quantum chemistry calculation methods.
语种:
英文
展开
高师化学类专业“三平台四层次”实践教学新体系的构建
作者:
王剑秋;许志锋;邝代治;冯泳兰;张复兴;...
期刊:
衡阳师范学院学报 ,2010年31(06):135-137 ISSN:1673-0313
作者机构:
衡阳师范学院,化学与材料科学系,湖南,衡阳,421008;[冯泳兰; 陈志敏; 邝代治; 王剑秋; 张复兴; 许志锋] 衡阳师范学院
关键词:
高师化学类;实践教学体系;构建;人才培养
摘要:
对高师化学类专业的实践教学改革进行了初步的探索,构建了"三平台四层次"的实践教学新体系,有效地培养了知识面广、动手能力强的高素质化学人才.
语种:
中文
展开
甲(乙)基在甲(乙)苯亲电取代反应中的定位作用和定位能力讨论
作者:
邝代治;冯泳兰;张复兴;王剑秋;许志锋;...
期刊:
衡阳师范学院学报 ,2010年31(03):142-147 ISSN:1673-0313
作者机构:
衡阳师范学院,化学与材料科学系,湖南,衡阳,421008;[冯泳兰; 邝代治; 王剑秋; 李俊华; 张复兴; 许志锋] 衡阳师范学院
关键词:
甲(乙)苯电子结构;烷基的定位效应
摘要:
在有机化学的亲电取代反应定位法则教学中,甲基代表烷基,作为芳烃亲电取代反应定位效应的典型例子,但甲基不同于乙基等烷基,具有不同的定位能力,烷基是如何影响芳环的结构从而影响取代基定位,教材和教学中描述较简单,不便于学生领会和比较.该文就此问题进行探讨,结果表明,烷基苯RAr(R=Me、Et)的R在空间的位置影响烷基苯的能量和原子电荷密度,从而影响烷苯的亲电取代反应.(1)烷苯的R-Ar键旋转形成不同构象,其中的最大与最小体系能量值之差ΔE,ΔE(Me)<ΔE(Et),{ΔE(Me)=0.000 008 4a.u ,ΔE(Et)= 0.006 802 9a.u},甲苯比乙苯的R-Ar单键更容易自由旋转.在EtAr,C8-C7-C1平面与苯环垂直时,体系能量[E(90)= -308.661 166a.u.]最低,为较稳定的优势构象.(2)甲基和乙基均向苯环供电子,虽甲(乙)苯环的碳原子所带电荷之和都不及苯,但甲苯比乙苯的环碳上电子密度大,∑Q(Me,30) = -1.027 94<∑Q(Et,90) =-1.010 487.(3) 甲(乙)苯化合物中,均为邻、对位碳原子电子密度大于苯环碳{甲基:邻位qC2(30) =qC6(30) =-0.212 118,对位-0.207 24 ~ -0.207 28;乙基:邻位qC2(90) =qC6(90) = -0.209 509,对位q(90)(-0.206 95)},间位碳原子的电子密度小于苯环碳[甲基间位-0.191 53~ -0.192 28;乙基间位q(90)= - 0.192 171],甲、乙苯的邻、对位有利于亲电取代反应,且甲基大于乙基的定位能力.(4)亲电试剂Me+与苯环反应形成邻、对位的碳正离子中间体比间位碳正离子中间体稳定,有利于生成邻、对位取代产物,因此,甲、乙基均为邻、对位定位基.
语种:
中文
展开
Synthesis, Crystal Structure and Fluorescence Property of a New Trinuclear Nickel( II) Complex Bridged by 2,6-Pyridine Dicarboxylic Acid
作者:
Xu Zhi-Feng* ;Kuang Dai-Zhi;Liu Meng-Qin;Zhang Fu-Xing;Wang Jian-Qiu
期刊:
Chinese Journal of Structural Chemistry ,2010年29(6):977-981 ISSN:0254-5861
通讯作者:
Xu Zhi-Feng
作者机构:
[Xu Zhi-Feng] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;Hengyang Normal Univ, Key Lab Funct Organometall Mat, Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Xu Zhi-Feng] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词:
nickel(II) complex;hydrothermal synthesis;crystal structure;pyridine 2,6-dicarboxylic acid;fluorescene property
摘要:
A new trinuclear nickel complex, [Ni_3(pdc)_3(2,2'-bipy)_3(H_2O)_2]·2H_2O (H_2pdc = pyridine 2,6-dicarboxylic acid, 2,2'-bipy = 2,2'-bipyridine) has been hydrothermally synthesized and characterized by IR, elemental analysis and X-ray diffraction methods. Crystal data for this complex: monoclinic, space group P2_1/n, a = 21.206(4), b = 10.002(2), c = 28.066(6)A,β = 108.18(3)°, C_51H_41N_9Ni_3O_16, M_r = 1212.06, V= 5.656(2) nm~3, D_c = 1.423 g·cm~(-3),μ(MoKa) = 1.062 mm~(-1), Z= 4, F(000) = 2488, GOOF = 1.034, the finalR = 0.0543 and wR= 0.1237 for 6149 observed reflections with I < 2σ(I). In the complex, three nickel(II) ions are bridged by the pyridine 2,6-dicarboxylic acid groups, and all nickel(II) ions are seven-coordinated by nitrogen atoms of 2,2'-bipyridine and pyridine 2,6-dicarboxylic acid and oxygen atoms from pyridine 2,6-dicarboxylic and water to adopt a severely distorted pentagonal bipyramidal geometry. The emission and excitation peaks of the complex in ethanol solutions are located at 336 and 316 nm, respectively.
语种:
英文
展开
Synthesis, crystal structure and electrochemical properties of the one-dimensional chain tri(n-butyl)tin 2,4-dichloro-phenoxy acetate
作者:
Yu Jiang-Xi;Kuang Dai-Zhi* ;Yin Du-Lin;Feng Yong-Lan;Zhang Fu-Xing;...
期刊:
无机化学学报 ,2010年26(8):1507-1510 ISSN:1001-4861
通讯作者:
Kuang Dai-Zhi
作者机构:
[Feng Yong-Lan; Kuang Dai-Zhi; Zhang Fu-Xing; Xu Zhi-Feng; Wang Jian-Qiu; Yu Jiang-Xi] Hengyang Normal Univ, Coll Hunan Prov, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Henan, Peoples R China.;[Yin Du-Lin; Yu Jiang-Xi] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
通讯机构:
[Kuang Dai-Zhi] H;Hengyang Normal Univ, Coll Hunan Prov, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Henan, Peoples R China.
关键词:
Crystal structure;Electrochemical property;Organotin;Synthesis
摘要:
A one-dimensional chain tri(n-buiyl)iin 2,4-dichloro-phenoxy acetate has been synthesized and characterized by IR, 1H NMR spectra and elemental analysis.The crystal structure has been determined by X-ray diffraction. The crystal belongs to monoclinic space group P21/c with a=1.350 1(8) nm, 6=1.7854(3) nm, c=1.0492(2) nm,β=105.146(10)°, Z=4, V=2.4414(2) nm3, Dc =1.388 Mg·m-3, μ(Mo Kα)=1.280 mm-1, F(000)=1040, R1=0.0442, wR2=0.1219. In the complex, tin atoms are five-coordinated distorted trigonal bipyramid configuration with bridging 2,4-dichloro-phenoxyacetic acid carboxy. The result of analysis shows that the electron transfer in electrode reaction is irreversible. CCDC: 715238.
语种:
英文
展开
Combination of hydrophobic effect and electrostatic interaction in imprinting for achieving efficient recognition in aqueous media
作者:
Xu, Zhifeng* ;Kuang, Daizhi;Feng, Yonglan;Zhang, Fuxing
期刊:
Carbohydrate Polymers ,2010年79(3):642-647 ISSN:0144-8617
通讯作者:
Xu, Zhifeng
作者机构:
[Xu, Zhifeng; Zhang, Fuxing; Feng, Yonglan; Kuang, Daizhi] Hengyang Normal Univ, Dept Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organomet Mat, Hengyang 421008, Peoples R China.
通讯机构:
[Xu, Zhifeng] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organomet Mat, Hengyang 421008, Peoples R China.
关键词:
Molecular imprinting;Acifluorfen;beta-Cyclodextrin;Molecular recognition
摘要:
An acifluorfen-imprinted polymer (P1) was prepared by the combined use of bismethacryloyl-β-cyclodextrin (BMA-β-CD) and 4-vinylpyridine (4-VP) as functional monomers. Compared with the molecularly imprinted polymers (MIPs) using only BMA-β-CD or 4-VP as a functional monomer, P2 and P3, respectively, P1 showed higher binding capacity (Cp) and imprinting factor (IF) for acifluorfen in aqueous media. Scatchard plot analysis revealed that two classes of binding sites were formed in the imprinted polymer P1 with dissociation constants of 0.435 and 0.868 μmol/ml, respectively. The results of competitive binding experiments showed that P1 can separate acifluorfen from its structural analogs. The study indicated that the combination of hydrophobic effect and electrostatic interaction in imprinting process is a feasible approach for achieving molecular recognition in aqueous media. © 2009 Elsevier Ltd. All rights reserved.
语种:
英文
展开
樟脑酸桥连一维链状钴配位聚合物{Co(phen)(H_2O)[C_8H_(14)(COO)_2]} _n·(CH_3OH)_n的水热合成和晶体结构
作者:
Zhi-Feng, Xu* ;Dai-Zhi, Kuang;Fu-Xing, Zhang;Jian-Qiu, Wang
期刊:
无机化学学报 ,2009年25(6):1133-1136 ISSN:1001-4861
通讯作者:
Zhi-Feng, Xu
作者机构:
[Fu-Xing, Zhang; Jian-Qiu, Wang; Zhi-Feng, Xu; Dai-Zhi, Kuang] Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构:
[Zhi-Feng, Xu] H;Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词:
钴(Ⅱ)配位聚合物;水热合成;晶体结构;樟脑酸
摘要:
近年来,由有机羧酸分子与金属离子通过配位键经自组装而构筑的配位聚合物,得到了突飞猛进的发展.由于这类聚合物不仅具有复杂多样的拓扑结构,而且在许多领域如材料、药物、分子电化学、分子识别和分子器件等方面的研究和开发中也表现出潜在的应用价值.
语种:
中文
展开
在有机化学教学中加强学生能力培养
作者:
许志锋;邝代治;张复兴;王剑秋
期刊:
衡阳师范学院学报 ,2009年30(03):159-161 ISSN:1673-0313
作者机构:
衡阳师范学院,化学与材料科学系,湖南,衡阳,421008;[邝代治; 王剑秋; 张复兴; 许志锋] 衡阳师范学院
关键词:
有机化学;能力培养;创新能力
摘要:
及时转变教育观念,在有机化学教学中从注重传授知识转向注重能力培养,改革教学方法和教学内容,发挥学生在教与学中的主体作用,提高学生的综合素质,培养创新型人才.
语种:
中文
展开