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1.
CdSO4·8/3H2O与5-氨基四唑-1-乙酸(Hatza)(Hatza=5-aminotetrazole-1-acetic acid)及4,4′-联吡啶(4,4’-bipy)在水和乙醇的混合溶液中反应,生成了一个新的配合物[Cd(atza)2(4,4’-bipy)0.5(H2O)].通过元素分析,红外光谱和X-射线单晶衍射对此配合物进行了表征.该配合物晶体结构属单斜晶系,主要晶体结构数据:空间群P21/c,a=10.356(2),b=13.482(3),c=13.230(3)?,β=111.18(3)(°).在此晶体中,Cd(II)与两个来自atza配体的两个氧原子、两个来自atza配体的两个氮原子、一个水分子的一个氧原子及一个4,4’-bipy配体的一个氮原子配位,配位数为6,配位构型为变形的八面体.每个atza作为双齿配体与两个Cd(II)配位,通过atza和4,4’-联吡啶配体的桥联作用,该配合物形成了沿bc面伸展的二维结构.相邻的面之间通过氢键作用,形成了三维结构.此外,在室温下研究了配合物固体荧光特性. 相似文献
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2-(2,3,5-三氮唑偶氮)-5-乙酰氨基苯酚与铜(Ⅱ)的显色反应及应用 总被引：3，自引：0，他引：3
介绍了新显色剂 2 -(2 ,3 ,5 -三氮唑偶氮 ) -5 -乙酰氨基苯酚 (TZAAP)与铜的显色反应研究及应用 ,建立了测定铜的新方法。在PH 5 .7的HOAc -NaOAc缓冲溶液中 ,该试剂与铜 (Ⅱ )形成 1∶1红色稳定络合物 ,λmax为 5 5 0 .8nm ,铜 (Ⅱ )量在 0～ 1 .6mg·L- 1范围内符合比耳定律 ,表观摩尔吸光系数为 2 .44×1 0 4 L·mol- 1·cm- 1。其他金属离子共存时 ,不经预分离可直接测定食品及环境水样中的微量铜 (Ⅱ ) ,操作简便 ,结果满意。 相似文献
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研究了2-[3-羧基-2,4,5-三氮唑偶氮]-5-二甲氨基苯甲酸(简称CTZADMB)与钯的显色反应。结果表明,在pH6.00的乙醇水溶液中CTZADMB与钯形成稳定蓝色络合物,其最大吸收波长位于585.2nm处,表现摩尔吸光系数为4.85×10~4l·mol~(-1)·cm~(-1),络合物的组成为pd:CTZADMB=1:2,钯浓度在0-1.6μg·ml~(-1)范围内服从比尔定律。所拟方法用于钯催化剂中微量钯的测定,结果满意。 相似文献
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以3-吡啶甲酸为原料,经过Curtius重排反应制得3-吡啶异氰酸酯,再进一步与5-氨基．1,2,3,4-四氮唑发生亲核加成反应,合成了1-（吡啶-3-基）-3-（1,2,3,4．四唑-5-基）脲。对产物进行了元素分析,以红外、核磁和紫外光谱表征。 相似文献
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在微波辐射条件下,以氨基胍重碳酸盐和甲酸为原料合成了3-氨基-1,2,4-三氮唑,反应速度比传统加热条件提高300倍,产率达到83.5%。优化后的最佳反应条件为微波输出功率为120 W,氨基胍重碳酸盐:甲酸摩尔比为1:1.25,溶剂无水乙醇为5mL,反应时间为60 s。 相似文献
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《湘南学院学报》2019,(5):102-107
本文以邻香草醛、5-氨基水杨酸和水合氯化镧为原料合成邻香草醛缩5-氨基水杨酸镧配合物,利用红外光谱、元素分析、化学分析等分析手段对合成的配合物进行表征.并在305.15 K条件下,采用生物微量热法分别测得不同浓度配合物作用下的S.pombe生长代谢产热曲线,通过计算得出S.pombe在配合物作用下的生长代谢速率常数k、抑制率I、最大发热功率P_(max)、达到最大发热功率所需时间t_(max),传代时间t_G等热动力学参数,再分析各参数与配合物浓度c之间的关系.实验结果表明:在研究浓度范围内,随着配合物浓度增加,生长速率常数k、最大发热功率P_(max)呈下降趋势,抑制率I以及传代时间t_G呈上升趋势,其半抑制浓度c_(I,50)为0.1746 g·L(-1),即邻香草醛缩5-氨基水杨酸镧配合物对S.pombe具有较好的抑制作用,且浓度越大,抑制作用越强. 相似文献
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《南阳师范学院学报》2017,(3):18-21
在表面活性剂Triton X-114存在下,利用Cu(Ⅱ)与2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚(5-Br-PADAP)反应生成疏水性配合物,建立了浊点萃取分光光度法测定痕量铜的方法.在pH=7的磷酸体系缓冲液中,该配合物的最大吸收波长λ_(max)=560nm,ε=2.7×105 L·mol5 L·mol(-1)·cm(-1)·cm(-1),测定铜的线性范围是0.01(-1),测定铜的线性范围是0.010.4μg/mL,相对标准偏差(RSD)为3.5%,加标回收率在95%0.4μg/mL,相对标准偏差(RSD)为3.5%,加标回收率在95%102%之间.此法用于实际水样中铜含量的测定,结果令人满意. 相似文献
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In order to separate ZSM-5 zeolite powders from solution easily, a series of magnetic ZSM-5 zeolites were prepared by hydrothermal synthesis with the addition of magnetic Fe3O4 panicles during the crystalline process. The products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, infrared （IR） spectrum, energy dispersive X-ray （EDX）, specific surface area, magnetic susceptibility and adsorption capability. It was found that the magnetic ZSM-5 zeolites had good magnetism and the magnetic susceptibility increased with the increasing amount of Fe3O4 panicles. Compared with the pure ZSM-5 zeolite, the adsorption capability of magnetic ZSM-5 zeolites was acceptable. When the magnetic zeolites were used to adsorb Pb^2＋ from solution, the magnetic zeolite powder could be conveniently separated with magnetic separation technology. 相似文献
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研究了以5-降冰片烯-2,3-二酸酐(NA)和甲醇为原料、甲苯为带水剂,磷酸做催化剂,合成5-降冰片烯-2,3-二羧酸二甲酯的过程。在此条件下,产率可达89.6%以上。并通过高效液相色谱仪(HPLC)分析、傅立叶变换红外光谱仪(IR)、气相色谱-质谱(GC-MS)对产物进行了表征。 相似文献
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Shao-xing Chen Feng-ying Huang Guang-hong Tan Cai-chun Wang Yong-hao Huang Hua Wang Song-lin Zhou Fan Chen Ying-ying Lin Jun-bao Liu 《Journal of Zhejiang University. Science. B》2009,10(1):22-28
Interleukin-5 (IL-5) accompanies the development of airway inflammation and hyperresponsiveness through the activation of eosinophils. Therefore, interference of IL-5 expression in lung tissue seems to be an accepted approach in asthma therapy. In this study, we designed a small interfering RNA (siRNA) to inhibit the expression of IL-5. The siRNAs against IL-5 were constructed in a lentivirus expressing system, and 1.5×106 IFU (inclusion-forming unit) lentiviruses were administered intratracheally to ovalbumin (OVA)-sensitized murine asthmatic models. Our results show that lentivirus-delivered siRNA against IL-5 efficiently inhibited the IL-5 messenger ribonucleic acid (mRNA) expression and significantly attenuated the inflammation in lung tissue. Significant decrease of eosinophils and inflammatory cells were found in peripheral blood, bronchoalveolar lavage fluid (BALF), and lung tissue. In addition, significant inhibition of airway hyperresponsiveness (AHR) was found in the mice treated with siRNA against IL-5. These observations demonstrate that siRNA delivered by means of the lentivirus system is possibly an efficacious therapeutic approach for asthma. 相似文献
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Structure and Dielectric Properties of Sb2O5-Doped ZrO2-SnO2-TiO2 Microwave Ceramics 总被引：1，自引：0，他引：1
The microwave frequency band is generally con-sidered in the range of 0.3—3 000 GHz. Its impor-tance is recognizable in the current growth of micro-wave communications systems which make use of thesuperior information density. Many kinds of dielectricmaterials have been developed for microwave applica-tions[1,2]. Among them, solid solution ZrO2-SnO2-TiO2(ZST) has a higher dielectric constant, a highquality factor (Q) value and a lowtemperature coeffi-cient of resonant frequency (TCF). B… 相似文献
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马利峰陈浩伟 《宁波大学学报(教育科学版)》2017,(4):76-080
加强大学生法治观念养成教育的力度,促使他们养成自觉守法、遇事找法、解决问题靠法的法律思维和行为方式,是我国实现全面依法治国、加快建设社会主义法治国家的基础工程。当前,应当创新大学生法治观念养成教育的课程体系,探索建立包含法治课程内容（Course）、法治教育实施（Carryout）、法治教育考核（Check）、法治教育完善（Consummate）、法治观念养成（Cultivating）为内容的大学生法治观念养成教育“5C”体系。 相似文献
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1 Introduction The 5-hydroxytryptamine type 3 (5-HT3) receptorantagonists[1-2]are currently used in the treatment ofchemotherapy and radiotherapy induced emesis . Thecompounds are based onthe parent structure showninFig.1 ,the aromatic systems include mono- and bicy-clic rings ,with or without heteroatoms ,and with vari-ous substitution patterns .This range of structural vari-ation makes it difficult to treat the analysis of thesecompounds .Fig .1 Parent structure of 5-HT3antagonists With t… 相似文献
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A new three-phase 5-level current-source inverter 总被引：1，自引：0，他引：1
BAO Jian-yu BAI Zhi-hong WANG Qing-song ZHANG Zhong-chao 《浙江大学学报(A卷英文版)》2006,7(12):1973-1978
INTRODUCTION Multilevel converters can offer substantial benefits for higher power applications compared to two level inverters, including reduced harmonics, and increased power ratings because of reduced switching device voltage and current stresses. However, until recently, multilevel voltage source inverters (Peng, 2001) have been the dominant multilevel topology, despite the fact that current-source inverters (CSIs) have many advantages for higher power applications. These include mo… 相似文献
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In this work, support vector classification （SVC） algorithm was used to build structure-activity relationship （SAR） model of the 5-hydroxytryptamine type 3 （5-HT3 ） receptor antagonists with 26 compounds. In a benchmark test, SVC was compared with several techniques of machine learning currently used in the field. The prediction performance of the model was discussed on the basis of the leave-one-out cross-validation. The results show that the accuracy of prediction of SVC model was higher than those of back propagation artificial neural network （BP ANN）, K-nearest neighbor （KNN） and Fisher methods. 相似文献
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5-Fluorouracil (5-FU) has a broad spectrum of anti-tumor activity, widely applied to the treatment of cancers. However, it is necessary to determine the plasma concentration of 5-FU in clinical practice due to its narrow therapeutic index. Therefore, a simple, economic and sensitive high-performance liquid chromatography (HPLC) method was developed and validated for the determination of 5-FU in human plasma. Ethyl acetate was chosen as extraction reagent. Chromatographic separation was performed on a Diamonsil C18 column (250 mm × 4.6 mm i.d., 5 μm) with the mobile phase consisting of methanol and 20 mmol/L ammonium formate using a linear gradient elution at a flow rate of 0.8 mL/min. 5-FU and 5-bromouracil (5-BU) were detected by UV detector at 265 nm. The calibration curve was linear over the concentration range of 5—500 ng/mL and the correlation coefficient was not less than 0.992 6 for all calibration curves. The intra- and inter-day precisions were less than 10.5% and 4.3%, respectively, and the accuracy was within ±3.7%. The recovery at all concentration levels was 80.1±8.6%. 5-FU was stable under possible conditions of storing and handling. This method is proved applicable to therapeutic drug monitoring and pharmacokinetic studies of 5-FU in human. 相似文献