期刊文献+
共找到1,791篇文章
< 1 2 90 >
每页显示 20 50 100
Heterogeneous Cu_(x)O Nano‑Skeletons from Waste Electronics for Enhanced Glucose Detection
1
作者 Yexin Pan Ruohan Yu +8 位作者 Yalong Jiang Haosong Zhong Qiaoyaxiao Yuan Connie Kong Wai Lee Rongliang Yang Siyu Chen Yi Chen Wing Yan Poon Mitch Guijun Li 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第11期554-568,共15页
Electronic waste(e-waste)and diabetes are global challenges to modern societies.However,solving these two challenges together has been challenging until now.Herein,we propose a laser-induced transfer method to fabrica... Electronic waste(e-waste)and diabetes are global challenges to modern societies.However,solving these two challenges together has been challenging until now.Herein,we propose a laser-induced transfer method to fabricate portable glucose sensors by recycling copper from e-waste.We bring up a laser-induced full-automatic fabrication method for synthesizing continuous heterogeneous Cu_(x)O(h-Cu_(x)O)nano-skeletons electrode for glucose sensing,offering rapid(<1 min),clean,air-compatible,and continuous fabrication,applicable to a wide range of Cu-containing substrates.Leveraging this approach,h-Cu_(x)O nanoskeletons,with an inner core predominantly composed of Cu_(2)O with lower oxygen content,juxtaposed with an outer layer rich in amorphous Cu_(x)O(a-Cu_(x)O)with higher oxygen content,are derived from discarded printed circuit boards.When employed in glucose detection,the h-Cu_(x)O nano-skeletons undergo a structural evolution process,transitioning into rigid Cu_(2)O@CuO nano-skeletons prompted by electrochemical activation.This transformation yields exceptional glucose-sensing performance(sensitivity:9.893 mA mM^(-1) cm^(-2);detection limit:0.34μM),outperforming most previously reported glucose sensors.Density functional theory analysis elucidates that the heterogeneous structure facilitates gluconolactone desorption.This glucose detection device has also been downsized to optimize its scalability and portability for convenient integration into people’s everyday lives. 展开更多
关键词 copper oxide Electron 3D tomography E-WASTE Glucose detection Electrochemical activation
下载PDF
Vision-based detection of weld pool width in TIG welding of copper-clad aluminum cable 被引量:5
2
作者 李云峰 赵熹华 李永强 《China Welding》 EI CAS 2007年第3期27-31,共5页
In order to realize automatic control of the width of weld pool, a visual sensor system for the width of weld pool detection is developed. By initiative arc light, the image of copper plate weld pool is taken back of ... In order to realize automatic control of the width of weld pool, a visual sensor system for the width of weld pool detection is developed. By initiative arc light, the image of copper plate weld pool is taken back of the torch through the process of weakening and filtering arc light. In order to decrease the time of processing video signals, analog circuit is applied in the processing where video signals is magnified, trimmed and processed into binary on the datum of dynamic average value, therefore the waveform of video signals of weld pool is obtained. The method that is used for detecting the width of weld pool is established. Results show that the vision sensing method for real-time detecting weld pool width to copper-clad aluminum wire TIG welding is feasible. The response cycle of this system is no more than 50 ms, and the testing precision is less than 0. 1 mm. 展开更多
关键词 visual sensor copper-clad aluminum cable TIG welding weld pool detection
下载PDF
Determination of Trace Amounts of Cobalt and Copper by High Performance Liquid Chromatography with Indigo Carmine Chemiluminescence Detection
3
作者 ZHANG Xin-xiang CHENG Jie-ke and ZENG Yun-e(Department of Chemistry,Wuhan University,Wuhan,430072) 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1996年第4期348-353,共6页
A post-column reaction chemiluminescence detection method in ion chromatography is described in this paper.The chemiluminescence system was indigo cramine-hydrogen peroxide. The chemiluminescence reaction conditions a... A post-column reaction chemiluminescence detection method in ion chromatography is described in this paper.The chemiluminescence system was indigo cramine-hydrogen peroxide. The chemiluminescence reaction conditions and the separation conditions of Co and Cu in chromatography were presented.The detection limits were 1.0 and 2.0×10-8 g/mL for Co and Cu respectively. 展开更多
关键词 s:Chemiluminescehce detection HPLC COBALT copper Indigo Carmine
下载PDF
Amperometric Detection of Histamine and Amino Acid Neurotransmitters in Capillary Electrophoresis with Copper Microelectrodes
4
作者 Hu, Shen Huang, Weihua +2 位作者 Pang, Daiwen Wang, Zongli Cheng, Jieke 《Wuhan University Journal of Natural Sciences》 EI CAS 1998年第3期87-90,共4页
Copper microelectrodes were used in microvoltammetry to detect histamine and several amino acid neurotransmitters. High sensitivity was obtained through the use of copper microelectrodes, and detection limits of 50 n... Copper microelectrodes were used in microvoltammetry to detect histamine and several amino acid neurotransmitters. High sensitivity was obtained through the use of copper microelectrodes, and detection limits of 50 nmol/L and 90 nmol/L were obtained for histamine and histidine, respectively. Furthermore, histamine and several amino acids neurotransmitters were firstly separated and detected by capillary electrophoresis with amperometric detection on copper microelectrodes. Mass limits of 490 amol and 440 amol were achieved for histamine and histidine, respectively, by using this mothod. 展开更多
关键词 capillary electrophoresis amperometric detection copper microelectrode
下载PDF
Effects of binuclear copper(Ⅱ)threonine complex on blood glucose, lipids and protection of the hearts and kidneys in diabetic mice
5
作者 谢英 王菲 +2 位作者 李菲菲 李明升 邓丽丽 《Journal of Chinese Pharmaceutical Sciences》 CAS 2007年第1期14-17,共4页
Aim To study the effects of binuclear copper (Ⅱ) threonine complex (Cu2 (Thr)4) as analogue of superoxide dismutase (SOD) on blood glucose, blood lipids and vessels of hearts and kidneys in diabetic mice. Met... Aim To study the effects of binuclear copper (Ⅱ) threonine complex (Cu2 (Thr)4) as analogue of superoxide dismutase (SOD) on blood glucose, blood lipids and vessels of hearts and kidneys in diabetic mice. Methods Diabetic mouse model was established by intraperitioneal injection of alloxan. Low, middle, and high doses of Cu2(Thr)4 at 0.002%, 0.02% and 0.1% were given respectively to diabetic mice following lavage. The fasting blood glucose was determined after the diabetic mice were given Cu2 (Thr)4 for 0, 30, and 45 d. The diabetic mice were killed on the 45th day. Then glycosylated hemoglobin (HbAlc) and blood lipids were assayed, and pathologic changes in hearts and kidneys stained with HE were observed. Results Compared with the control group in which the diabetic mice were given distilled water, the value of blood glucose reduced significantly in middle dose group (P 〈 0.01 ), followed by that in low dose group (P 〈 0.05). TC level reduced markedly and HDL level increased significantly in all three treatment groups (P 〈 0.05). Especially in middle dose group, cardiac muscle fibers were neatly arranged, nucleus and cytoplasm well distributed, glomeruli showing normal structure, cells well distributed and staining being normal. Conclusion Cu2 (Thr)4 reduces blood glucose, regulates blood lipids, and play protective action on the vessels of hearts and kidneys in diabetic mice. The effects of it in middle dose were better than those of other doses. 展开更多
关键词 Binuclear copper threonine complex Diabetic mice Blood glucose Blood lipids
下载PDF
Amplatzer动脉导管封堵器-Ⅱ治疗伴发主动脉窦脱垂室间隔缺损患儿效果分析 被引量:1
6
作者 左超 陈智 +4 位作者 肖云彬 杨舟 王祥 王野峰 向金星 《介入放射学杂志》 CSCD 北大核心 2024年第1期17-21,共5页
目的探讨Amplatzer动脉导管封堵器(ADO)-Ⅱ治疗伴发主动脉窦脱垂室间隔缺损(VSD)患儿的效果。方法回顾性收集2018年1月至2022年9月于湖南省儿童医院住院治疗的94例伴发主动脉窦脱垂VSD患儿临床资料。其中男60例,女34例,年龄为(4.7±... 目的探讨Amplatzer动脉导管封堵器(ADO)-Ⅱ治疗伴发主动脉窦脱垂室间隔缺损(VSD)患儿的效果。方法回顾性收集2018年1月至2022年9月于湖南省儿童医院住院治疗的94例伴发主动脉窦脱垂VSD患儿临床资料。其中男60例,女34例,年龄为(4.7±3.1)岁;主动脉窦轻中度脱垂83例,VSD为(4.12±0.97)mm,重度脱垂11例,VSD为(4.95±0.51)mm;VSD类型为膜周部54例,嵴内以上40例。分析VSD大小、主动脉窦脱垂程度与ADO-Ⅱ选择的关系,以及术后中期主动脉瓣反流、残余漏变化,明确ADO-Ⅱ对此类患儿的适用性。结果术后中期最终存留主动脉瓣轻度反流6例,多发于使用4-4 mm、5-4 mm型ADO-Ⅱ封堵器;残余漏10例,主要发生于使用5-4 mm、6-4 mm型封堵器。结论ADO-Ⅱ封堵器在置入形态良好状况下,适用于VSD<6 mm伴主动脉窦脱垂患儿。术后有一定的残余漏和主动脉脉瓣反流发生,但能满足介入治疗要求。 展开更多
关键词 室间隔缺损 主动脉窦脱垂 Amplatzer动脉导管封堵器-
下载PDF
Determination of Ultratrace Amounts of Copper(Ⅱ) in Water Samples by Electrothermal Atomic Absorption Spectrometry After Cloud Point Extraction 被引量:10
7
作者 CHEN Jian-guo CHEN neng-wu +2 位作者 CHEN Shao-hong LIN Li ZHONG Ying-ying 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2007年第2期143-147,共5页
A novel approach was developed for the determination of ultratrace amounts of copper in water samples by using electrothermal atomic absorption spectrometry (ETAAS) after cloud point extraction ( CPE ). 1-( 2-Pyr... A novel approach was developed for the determination of ultratrace amounts of copper in water samples by using electrothermal atomic absorption spectrometry (ETAAS) after cloud point extraction ( CPE ). 1-( 2-Pyridylazo ) -2- naphthol was used as the chelating reagent and Triton X-114 as the mieellar-forming surfactant. CPE was conducted in a pH 8. 0 medium at 40 ℃ for 10 rain. After the separation of the phases by contrifugafion, the surfactant-rieh phase was diluted with 1 mL of a methanol solution of 0. 1 mol/L HNO3. Then 20μL of the diluted surfactant-rieh phase was injected into the graphite furnace for atomization in the absence of any matrix modifier. Various experimental conditions that affect the extraction and atomization processes were optimized. A detection limit of 5 ng/L was obtained after preconeentration. The linear dynamic range of the copper mass concentration was found to be 0-2.0 ng/mL, and the relative standard deviation was found to be less than 3. 1% for a sample containing 1.0 ng/mL Cu ( Ⅱ ). This developed method was successfully applied to the determination of uhratraee amounts of Cu in drinking water, tap water, and seawater samples. 展开更多
关键词 Cloud point extraction Preconeentration Electrothermal atomic absorption spectrometry copper Water analysis
下载PDF
Synthesis and Catalytic Activity of Copper(Ⅱ) Resorcylic Acid Nanoparticles 被引量:7
8
作者 LI Yu LIU You-zhi 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2007年第2期217-220,共4页
Copper( Ⅱ ) resercyiic acid(CuRes) nanoparticles were synthesized by using reactive precipitation method with resorcylic acid and blue copperas as the raw material in a rotating packed bed. The sample obtained wa... Copper( Ⅱ ) resercyiic acid(CuRes) nanoparticles were synthesized by using reactive precipitation method with resorcylic acid and blue copperas as the raw material in a rotating packed bed. The sample obtained was characterized by using X-ray diffraction(XRD), transmission electron micrescopy(TEM), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analyses (TG), and element analysis. In addition, the catalytic activity of CuRes nanoparticles on the thermal decomposition of nitrocellulose-nitroglycerine(NC-NG) was also determined via DSC. The results show that the spherical nanoparticles with a diameter of 20 nm were obtained in ethanol solution. The peak temperature of the thermal decomposition of NC-NG-CuRes decreases by 3℃ compared with that of normal CuRes, and the decomposition enthalpy is increased by 735 J/g, and therefore, it is reasonable to assume that CuRes nanoparticles have a better catalytic activity. 展开更多
关键词 Combustion catalyst Resoreylic add copper salt Reactive precipitation Rotating packed bed
下载PDF
Hydrothermal Synthesis,Crystal Structure and Thermal Stability of a Binuclear Copper(Ⅱ) Complex with 3-(Pyridin-2-yl)-1,2,4-triazole 被引量:7
9
作者 李昶红 谭雄文 +1 位作者 李薇 杨颖群 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2011年第2期289-292,共4页
One novel binuclear copper(Ⅱ) complex [Cu 2 (Hpt) 2 (CO 3) 2 (H 2 O) 2 ]·H 2 O with copper carbonate and 3-(pyridin-2-yl)-1,2,4-triazole (Hpt) was hydrothermally synthesized and characterized by IR a... One novel binuclear copper(Ⅱ) complex [Cu 2 (Hpt) 2 (CO 3) 2 (H 2 O) 2 ]·H 2 O with copper carbonate and 3-(pyridin-2-yl)-1,2,4-triazole (Hpt) was hydrothermally synthesized and characterized by IR and X-ray diffraction analysis.The complex crystallizes in triclinic,space group P2 1 /n with a=0.6862(1),b=0.7805(1),c=1.1983(2) nm,α=72.03(2),β=107.72(3),γ=75.28(2)o,V=0.5884 nm 3,D c=2.105 g/cm 3,Z=1,F(000)=357,GOOF=1.041,the final R=0.01859 and wR=0.04348.The whole molecule is composed of two cooper ions,two Hpt molecules,two carbonate and three water molecules,forming a binuclear structure.The crystal structure shows that the cooper ion is coordinated with three nitrogen atoms from two Hpt molecules,two oxygen atoms from one carbonic acid and one water molecule,forming a distorted square pyramidal geometry.The TG analysis result shows that the title complex is stable under 131.0 ℃. 展开更多
关键词 copper complex hydrothermal synthesis crystal structure thermal stability analysis
下载PDF
A novel spectrophotometric determination of copper(Ⅱ) with bromosulphonazoⅢ 被引量:3
10
作者 Li Yuan Shu Hui Huo Xiao Na Ren Hui Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第1期92-94,共3页
A novel chromogenic reaction involving copper(Ⅱ) and bromosulphonazo Ⅲ (Br-SAZⅢ) in hexamethylenetetramine- hydrochloric buffer solution was investigated. The results showed that a blue complex of copper(Ⅱ) ... A novel chromogenic reaction involving copper(Ⅱ) and bromosulphonazo Ⅲ (Br-SAZⅢ) in hexamethylenetetramine- hydrochloric buffer solution was investigated. The results showed that a blue complex of copper(Ⅱ) and bromosulphonazo Ⅲ was formed with a molar ratio of 1:1. The apparent molar absorptivity was 3.3×10^5Lmol-1cm-1 and the maximum absorption peak was at 616.8 nm. The proposed procedure was used for quantitative estimation of Cu(II) in the concentration range of 0-1.024μg/mL with the detection limit (3σ) of 7.03 × 10^-4 μg/mL (n = 20). The relative standard deviations (RSDs) were 0.56-4.68%. Under the optimized conditions, total copper in the vegetables and tea was successfully determined. 2007 Li Yuan. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved. 展开更多
关键词 SPECTROPHOTOMETRY Bromosulphonazo copper VEGETABLE TEA
下载PDF
Crystal Structure, Electrochemical and Fluorescent Properties of a New Copper(Ⅱ) Coordination Polymer with 2,3-Pyridinedi-carboxylic Acid 被引量:3
11
作者 LI Wei LIU Yang +1 位作者 LI Chang-Hong YANG Ying-Qun 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2019年第11期1940-1946,共7页
A new copper(Ⅱ)coordination polymer[Cu5(Hpt)5(H2O)2(2,3-PCA)2]n·12nH2O(1)has been successfully synthesized under hydrothermal conditions with copper hydroxide,3-(pyridin-2-yl)-1,2,4-triazole(Hpt)and 2,3-pyridine... A new copper(Ⅱ)coordination polymer[Cu5(Hpt)5(H2O)2(2,3-PCA)2]n·12nH2O(1)has been successfully synthesized under hydrothermal conditions with copper hydroxide,3-(pyridin-2-yl)-1,2,4-triazole(Hpt)and 2,3-pyridinedi-carboxylic acid(2,3-PCA).The structure of the title compound was determined by X-ray diffraction analyses,elemental analyses and IR spectrum.The architecture of 1 consists of one-dimensional sandwich-like chains which are connected by extensive hydrogen bonding interactions.The solid-state photoluminescence displays an obvious emission band at 384 nm upon excitation at 340 nm.In addition,electrochemistry property has also been studied. 展开更多
关键词 copper()coordination polymer FLUORESCENT ELECTROCHEMICAL properties
下载PDF
Simple, Selective, and Sensitive Spectrophotometric Method for Determination of Trace Amounts of Nickel(Ⅱ), Copper (Ⅱ), Cobalt (Ⅱ), and Iron (Ⅲ) with a Novel Reagent 2-Pyridine Carboxaldehyde Isonicotinyl Hydrazone 被引量:2
12
作者 Sajid H. Guzar JIN Qin-han 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2008年第2期143-147,共5页
A selective and sensitive reagent of 2-pyridine carboxaldehyde isonicotinyl hydrazone(2-PYAINH) was synthesized and studied for the spectrophotometric determination of nickel, copper, cobalt, and iron in detail. At ... A selective and sensitive reagent of 2-pyridine carboxaldehyde isonicotinyl hydrazone(2-PYAINH) was synthesized and studied for the spectrophotometric determination of nickel, copper, cobalt, and iron in detail. At a pH value of 7.0, 9,0, 9.0, and 8.0, respectively, which greatly increased the selectivity; nickel, copper, cobalt, and iron reacted with 2-PYAINH to form a 1:2 yellow-orange, 1:2 yellow-green, 1:2 yellow and 1:1 yellow complexes, with absorption peaks at 363, 352, 346, and 359 nm, respectively. Under the optimal conditions, Beer's law was obeyed over the ranges of 0.01-1.4, 0.01-1.5, 0.01-2.7, and 0.01-5.4 mg/L respectively. The apparent molar absorptivity and Sandell's sensitivities were 8.4×10^4, 5.2×10^4, 7.1×10^4, and 3.9×10^4 L·mol^-l·cm^-1, respectively, and 0.00069, 0.0012, 0.00078, and 0.0014 μg·cm2, respectively. The detection limits were found to be 0.001, 0.002, 0.003, and 0.01 mg/L, respectively. The detailed study of various interfering ions to make the method more sensitive was carried out and selective and several real samples were analyzed with satisfactory results. 展开更多
关键词 copper Nickel( Cobalt( Iron(Ⅲ) 2-Pyridine carboxaldehyde isonicotinyl hydrazone(2-PYAINH) SPECTROPHOTOMETRY
下载PDF
Two Novel Copper(Ⅱ) Complexes with A Novel Ligand 2,4-Di(2-aminopyridine)-6-methylpyrimidine 被引量:2
13
作者 MAHai-rui WANGYao-yu +4 位作者 LIUPing LIDong-sheng SHIQi-zhen LEEGene-hsiang PENGShie-ming 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第3期365-367,共3页
关键词 Novel ligand copper() complex Cystal structure SUPRAMOLECULE
下载PDF
Syntheses, Structures and Photoluminescence of the Cadmium(Ⅱ) and Copper(Ⅱ) Complexes Based on 4'-(4''-Pyridyl)-2,2':6',2''-terpyridine and 1,4-Benzenedicarboxylic Acid Ligands 被引量:3
14
作者 张兴晶 王璐瑶 +2 位作者 尉兵 张文通 车广波 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2015年第7期1069-1079,共11页
Two new metal-organic complexes [Cd2(1,4-BDC)(4-pytyp)(H2O)4]·(1,4-BDC)(1) and [Cu2(1,4-BDC)(4-pytyp)2(H2O)2]·(1,4-BDC)·8H2O(2)(4-pytyp = 4'-(4''-pyridyl)-2,2':6',2''-terp... Two new metal-organic complexes [Cd2(1,4-BDC)(4-pytyp)(H2O)4]·(1,4-BDC)(1) and [Cu2(1,4-BDC)(4-pytyp)2(H2O)2]·(1,4-BDC)·8H2O(2)(4-pytyp = 4'-(4''-pyridyl)-2,2':6',2''-terpyridine, 1,4-H2 BDC = 1,4-benzenedicarboxylic acid) have been synthesized under hydrothermal conditions and characterized by elemental analysis, infrared analysis and X-ray single-crystal diffraction. The scrutiny of single-crystal structure reveals that complex 1 forms to a 3D supramolecular network linked by π-π stacking interactions and hydrogen bonds. X-ray diffraction analysis reveals that complex 2 exhibits a 3D supramolecular network linked through complicated hydrogen bonds. The thermogravimetric analysis and photoluminescent properties of 1 and 2 are discussed in detail. 展开更多
关键词 cadmium( complex copper complex 4'-(4''-pyridyl)-2 2':6' 2''-terpyridine 1 4-benzenedicarboxylic acid crystal structure
下载PDF
Synthesis,Crystal Structure and Thermal Stability Properties of a Binuclear Copper(Ⅱ) Coordination Polymer {[Cu_2(4,4'-bipy)_2(o-ABA)_4(H_2O)_2][(H_2O)_2]}_n 被引量:3
15
作者 刘停 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第2期195-198,共4页
One-dimensional chain copper(Ⅱ) coordination polymer has been synthesized and characterized in the solvent mixture of water and alcohol with o-acetamidobenzoic acid,4,4'-bipyridine and copper perchlorate.It is of ... One-dimensional chain copper(Ⅱ) coordination polymer has been synthesized and characterized in the solvent mixture of water and alcohol with o-acetamidobenzoic acid,4,4'-bipyridine and copper perchlorate.It is of tetragonal,space group P41212 with a=1.57756(10),b= 1.57756(10),c=2.1438(3)nm,V=5.3352(8) nm^3,Dc=1.524 g/cm^3,Z=4,F(000)=2536,R= 0.0479 and wR=0.0979.The crystal structure shows two coordination modes.The copper(1) is coordinated with two nitrogen atoms of one 4,4'-bipyridine molecule and two oxygen atoms from two o-acetamidobenzoic acid molecules,forming a distorted tetrahedral coordination geometry; the copper(2) is coordinated with two nitrogen atoms of one 4,4'-bipyridine molecule,four oxygen atoms from two o-acetamidobenzoic acid molecules and two water molecules,generating a distorted octahedral coordination geometry.The result of TG analysis shows that the title complex is stable below 180.0 ℃. 展开更多
关键词 copper coordination polymer crystal structure thermal stability analysis
下载PDF
Hydrothermal Synthesis and Crystal Structure of a Novel Hexanuclear Copper(Ⅱ) Complex:[Cu_6(DPPZ)_4(btc)_4(H_2O)_8]·5H_2O 被引量:3
16
作者 刘春波 高林 +3 位作者 李秀颖 徐占林 王庆伟 车广波 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2011年第2期262-266,共5页
A new hexanuclear copper(Ⅱ) complex,[Cu 6 (DPPZ) 4 (btc) 4 (H 2 O) 8 ]·5H 2 O (1,DPPZ=dipyrido[3,2-a:2,3-c]phenazine,H 3 btc=1,3,5-benzenetricarboxylic acid),has been hydrothermally synthesized and st... A new hexanuclear copper(Ⅱ) complex,[Cu 6 (DPPZ) 4 (btc) 4 (H 2 O) 8 ]·5H 2 O (1,DPPZ=dipyrido[3,2-a:2,3-c]phenazine,H 3 btc=1,3,5-benzenetricarboxylic acid),has been hydrothermally synthesized and structurally characterized by X-ray single-crystal diffraction,elemental analyses,IR,and thermogravimetric analysis.Its crystal structure is of triclinic system,space group P1 with a=12.489(4),b=14.234(5),c=14.484(5),α=82.848(4),β=79.399(4),γ=73.646(4)°,V=2421.2(13) 3,Z=1,Cu 6 C 108 H 78 N 16 O 37,M r=2573.17,D c=1.752 g/cm 3,μ=1.398 mm-1,F(000)=1308,GOOF=1.011,the final R=0.0495 and wR=0.1030 for 5420 observed reflections with I 2σ(Ⅰ).In 1,four btc 3ligands act as bridges between six neighboring Cu atoms to form an unusual hexanuclear copper cluster.The clusters are further connected by two types of O-H···O and O-H···N hydrogen bonds,generating a three-dimensional supramolecular structure.In addition,intermolecular and intramolecular π-π stacking interactions further consolidate the three-dimensional supramolecular framework of 1. 展开更多
关键词 copper complex dipyrido[3 2-a:2 3-c]phenazine 1 3 5-benzenetricarboxylic acid HEXANUCLEAR
下载PDF
Thermal Behavior, Non-isothermal Decomposition Reaction Kinetics of Copper(Ⅱ) Salt of 4-Hydroxy-3,5-dinitropyridine and Its Application in Propellant 被引量:2
17
作者 CHENPei ZHAOFeng-qi +5 位作者 LUOyang HURong-zu GAOSheng-li ZHENGYu-mei DENGMin-zhi GAOYin 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第1期100-103,共4页
The thermal behavior and kinetic parameters of the major exothermic decomposition reaction of the title compound in a temperature-programmed mode were studied by means of TG-DTG and DSC. The critical temperature of th... The thermal behavior and kinetic parameters of the major exothermic decomposition reaction of the title compound in a temperature-programmed mode were studied by means of TG-DTG and DSC. The critical temperature of thermal explosion was calculated. The effect of the title compound on the combustion characteristic of composition modifier double base propellant containing RDX was explored with a strand burner. The results show that the kinetic model function in differential forms, the apparent activation energy(E a) and the pre-exponential factor(A) of the major exothermic decomposition reaction are 3(1-α)[-ln(1-α)] 2/3, 190.56 kJ/mol and 10 13.39 s -1, respectively. The critical temperature of thermal explosion of the compound is 353.08 ℃. The kinetic equation of the major exothermic decomposition process of the title compound at 0.1 MPa could be expressed as dα/dT=10 14.65(1-α)[-ln(1-α)] 2/3 e -2.2920×104/T. As an auxiliary catalyzer, the title compound can help the main catalyzer of lead salt of 4-hydroxy-3,5-dinitropyridine to accelerate the burning rate and reduce the pressure exponent of RDX-CMDB propellant. 展开更多
关键词 Thermal behavior Decomposition kinetics copper() salt of 4-hydroxy-3 5-dinitropyridine Application PROPELLANT
下载PDF
A Novel Copper(Ⅱ) Complex of Asymmetrically N-Functionalized 1,4,7-Triazacyclononane Ligand: Syntheses, Structure, Electrochemical Property and Biological Activities 被引量:2
18
作者 李庆祥 王武伦 孟祥高 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2018年第6期878-886,共9页
A novel copper(Ⅱ) complex derived from 1,4,7-triazacyclononane[CuL]_2(PF_6)_3×MeCN×H_2 O was synthesized and crystallographically characterized {L = 1,4-bis(2-carbamoylethyl)-7-benzimidazole-2-yl-meth... A novel copper(Ⅱ) complex derived from 1,4,7-triazacyclononane[CuL]_2(PF_6)_3×MeCN×H_2 O was synthesized and crystallographically characterized {L = 1,4-bis(2-carbamoylethyl)-7-benzimidazole-2-yl-methyl-1,4,7-triazacyclononane}. It crystallizes in triclinic, space group P1, with a = 13.2425(13), b = 14.0807(15), c = 17.6798(18), α = 86.296(2), β = 72.773(2), γ= 68.905(2)o, V = 2934.5(5)A^3, Z = 2, D_c = 1.611 g/m^3, F(000) = 1456, M_r = 1423.09, m = 0.920 mm^-1. The final R = 0.0671 and wR = 0.1874 for 6501 observed reflections with I 〉 2σ(I). The structural analysis shows that the complex cation([CuL]_2^3+) was formed by two complex cations, namely([CuL^3]^2+) and [CuL_(-H)~3]~+) through a hydrogen bond. In each complex cation, the Cu(Ⅱ) lies in a distorted square pyramidal geometry. The redox behavior was studied by cyclic voltammetry(CV) in aqueous solution which indicates a reversible one electron redox reaction. The result of UV absorption, ethidium bromide(EB) fluorescence spectra indicated that the complex binds to CT-DNA in an intercalative mode. Superoxide dismutase(SOD) activity of the complex was determined by photoreduction of NBT, and the value of IC_(50) is 5.22 μmol·L^-1. 展开更多
关键词 1 4 7-triazacyclononane copper COMPLEX crystal structure electrochemical property DNA Superoxide dismutase
下载PDF
Sorption Kinetic Analysis for the Removal of Copper(Ⅱ) by Using Biofilm 被引量:3
19
作者 张敬 姜斌 +2 位作者 李鑫钢 刘瑞轩 孙永利 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第1期135-139,共5页
The biosorption of copper(Ⅱ) ions onto biofilm was studied in a batch system with respect to the temperature, initial pH value and biofilm sorbent mass. The biomass exhibited the highest copper(Ⅱ) sorption capacity ... The biosorption of copper(Ⅱ) ions onto biofilm was studied in a batch system with respect to the temperature, initial pH value and biofilm sorbent mass. The biomass exhibited the highest copper(Ⅱ) sorption capacity under the conditions of room temperature, initial pH value of 6.0 and the sorbent mass 8 g. The experimental data were analyzed using four sorption kinetic models, the pseudo-first order, the Ritchie second order, the modified second order and the Elovich equations to determine the best-fit equation for the sorption of metal ions onto biofilm. Comparing with the sum of squared-errors, the results show that both the Ritchie second order and modified second order equations can fit the experimental data very well. 展开更多
关键词 BIOSORPTION copper() BIOFILM KINETICS
下载PDF
Synthesis and Crystal Structure of Bis[O,O'-di(2-phenylethyl)dithiophosphato](α,α'-bipyridine)copper(Ⅱ) 被引量:2
20
作者 邹立科 谢斌 +2 位作者 赵彬 王军 冯建申 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第12期1768-1773,共6页
A ternary adduct Cu[S2P(OCH2CH2Ph)2]2·bipy(bipy=α,α'-bipyridine) was syn-thesized and characterized by elemental analysis,IR and single-crystal X-ray diffraction.The crystal belongs to the triclinic system... A ternary adduct Cu[S2P(OCH2CH2Ph)2]2·bipy(bipy=α,α'-bipyridine) was syn-thesized and characterized by elemental analysis,IR and single-crystal X-ray diffraction.The crystal belongs to the triclinic system,space group P1 with a=10.2320(2),b=11.5249(3),c=18.0916(3),α=98.95(1),β =103.601(1),γ=91.272(2)°,V=2044.49(7)3,Z=2,Dc=1.453 g/cm3,T=153(2) K,C42H44CuN2O4P2S4,Mr=894.51,λ(MoKα)=0.71073,μ=0.86 mm-1,S=0.999,(△/σ)max=0.002,the final R=0.0243 and wR=0.0704.A total of 9221 unique reflections were collected,of which 8573 with Ⅰ 〉2σ(Ⅰ) were observed.The Cu(Ⅱ) atom is five-coordinated in a rather distorted trigonal bipyramidal geometry(τ value=0.537).The Cu-S distances range from 2.3491(4) to 2.4829(4) ,and the Cu-N distances are 1.9987(12) and 2.0584(11) ,respectively.An interesting feature of this adduct resides in its two-dimensional(2D) open framework constructing through hydrogen bonding and π-π interactions. 展开更多
关键词 O O'-dialkyldithiophosphate copper adduct synthesis crystal structure
下载PDF
上一页 1 2 90 下一页 到第
使用帮助 返回顶部