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新试剂4-氯查尔酮缩氨基硫脲与铜(Ⅱ)显色反应的研究 总被引:2,自引:0,他引:2
研究了新试剂4-氯查尔酮缩氨基硫脲(CCT)与铜(Ⅱ)的显色反应,建立了测定微量铜的光度分析新方法。试验结果表明,在乳化剂OP存在下,在HAc-NaAc缓冲体系中,铜(Ⅱ)与CCT发生灵敏的显色反应,形成一种稳定的摩尔比为1∶2的黄色配合物,其最大吸收波长位于394 nm处,表观摩尔吸光系数ε=3.76×104L.mol-1.cm-1,铜量在0~1.2μg/mL范围内符合比尔定律,相关系数r=0.999。该方法直接在室温下水溶液中就可以进行测定,且灵敏度高,选择性好,用于人工合成样中微量铜(Ⅱ)的测定。 相似文献
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根据活性亚结构拼接原理,通过紫罗兰酮与(取代)苯甲醛反应合成了紫罗兰酮基双查尔酮,然后经与氨基硫脲缩合得到一系列未见报道的新型含紫罗兰酮、查尔酮及氨基硫脲3种优势结构单元的杂化体,它们的化学结构经傅里叶变换红外光谱(FT-IR)、核磁共振波谱(~1H NMR、~(13)C NMR)、元素分析及质谱(MS)等测试技术所证实。采用溴化噻唑蓝四氮唑(MTT)法初步测定其体外抗肿瘤活性(乳腺癌细胞(MCF-7),肝癌细胞(Hep G2),肺癌细胞(A549)),结果表明,对于不同类型的肿瘤细胞,化合物展现较好的增殖抑制活性。尤其是化合物3a与3b对MCF-7细胞展现较强的抗增殖活性,半数致死量(IC_(50))值分别为10.83和7.62μmol/L,化合物3e对A549细胞显示一定的增殖抑制活性效果(IC_(50)值为13.36μmol/L),化合物3f对Hep G2细胞表现了高效的抗增殖活性(IC_(50)值为8.55μmol/L)。目标物的抗增殖活性与紫罗兰酮结构及查尔酮环上不同电子效应的取代基有关。 相似文献
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噻吩查尔酮紫外光谱的取代基效应陆文兴颜朝国(扬州大学师范学院化学系江苏扬州225002)朱权(扬州化工学校江苏扬州225002)关键词噻吩查尔酮KF-Al2O3紫外光谱取代基效应中图分类号O626.12我们曾报导查尔酮的KF-Al2O3催化合成[1]... 相似文献
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呋喃查尔酮紫外光谱的取代基效应 总被引:2,自引:0,他引:2
我们曾报道了查尔酮的KF-Al2O3催化合成[1],也曾报道了用KF-Al2O3催化合成的六个噻吩查尔酮化合物的紫外光谱的取代基效应[2]。本文用KF-Al2O3催化α-乙酰呋喃与芳香醛进行羟醛缩合反应,合成了5个标题化合物。产率在40%~70%之间。测定了它们在16种溶剂中的紫外光谱,发现无论在极性还是非极性溶剂中其紫外光谱的最大吸收峰波数与Hammett亲电取代常数之间呈良好的线性关系。1 实验部分1.1 药品和仪器合成所用药品均为试剂级,α-乙酰呋喃、KF-Al2O3按文献[3,4]制备。溶剂均为分析纯,按文献方法[5]处理。熔点用毛细管法测定,温度计未… 相似文献
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在AM1方法优化构型的基础上,用ZINDO/CI方法计算了系列芳香杂环聚合物的紫外-可见光谱,探索分子结构与其光学性质之间的关系.理论计算结果表明,模型化合物ABPBO,PBO,PBOV和PBODV的紫外-可见光谱最大吸收波长(λmax)依次增加,且相应吸收强度与分子链共轭长度相关.根据线性递变规律推导的理论λmax值与其实验值(薄膜干态紫外吸收)符合得较好.由于质子化效应等环境因素,溶液中测量值较理论值和薄膜紫外吸收偏大. 相似文献
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四氯化钼催化丁二烯1,2-聚合体系的紫外可见光谱研究 总被引:3,自引:0,他引:3
对四价钼系催化丁二烯1,2-聚合中Mo(Ⅳ)络合物的紫外可见光谱进行了研究.MoCl4乙酸乙酯溶液呈棕红色,显顺磁性.在光谱的紫区和红区共有3个自旋允许d-d跃迁吸收带.Mo(Ⅳ)八面体络合物上各种配体的交换对光谱吸收带位置无影响.Mo(Ⅳ)在512nm处的特征吸收带随Al(i-Bu)3/Mo或Al(i-Bu)2OPh/Mo增加而渐趋消失,这是Mo(Ⅳ)→Mo(Ⅲ)反应的标志.在MoCl4-n·(OC8H17)n-Bd-Al(i-Bu)2OPh3组分陈化体系中Mo(Ⅳ)的还原得到加快,催化聚合活性亦有提高。 相似文献
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概述了薄层光谱电化学技术的进展,着重阐述了紫外-可见薄层光谱电化学方法在药物化学中的应用.引用文献50篇. 相似文献
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采用原位紫外-可见吸收光谱法研究了苯胺(AN)和邻-氨基酚(OAP)在0.5 mol/L H2SO4溶液中的电化学共聚过程.结果表明,在AN和OAP的共聚过程中,OAP首先被氧化生成其阳离子自由基,对应于460 nm处的吸收峰,然后OAP阳离子自由基与继而生成的AN阳离子自由基和溶液中的AN和OAP单体发生交互反应,生成混合二聚物中间体,对应于490 nm处的吸收峰,此混合二聚物中间体再继续反应生成中性低聚物,对应于波长小于460 nm处的吸收峰.在研究不同浓度比的AN和OAP进行电化学共聚时发现,当溶液中OAP浓度增大时,对AN的聚合会产生抑制作用. 相似文献
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用荧光光谱和紫外-可见差谱研究抗体-卟啉的相互作用 总被引:7,自引:0,他引:7
meso-四(α,α,α,α-O-苯乙酰苯)卟啉与其单克隆抗体1F2结合后,产生显著的增色效应,反映了卟啉与抗体之间刚性紧密的结合,在抗体中的抗原结合部位存在芳香族氨基酸.用同步荧光光谱结合荧光猝灭法得到抗体抗原结合部位的芳香族氨基酸主要为色氨酸和酪氨酸,但酪氨酸的残基数要少于色氨酸.卟啉与抗体的结合比为1:1,解离常数(2.084±0.246)×10-10mol/L,可见卟啉与McAb1F2有很高的亲和力. 相似文献
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SynthesisandStructureof4-NitrobenzaldehydeThiosemicarbazoneTianYu-Peng;DuanChun-Ying;LuZhong-Lin;YouXiao-Zeng(CoordinationChe... 相似文献
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Contacted Ion Pairs in Aqueous CuCl2 by the Combination of Ratio Spectra,Difference Spectra,Second Order Difference Spectra in the UV-Visible Spectra
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Si-wen Ju Ning Zhang Zhi-qiang Wang Rui-ting Zhang De-wen Zeng Xiao-peng Shao Ke Lin 《化学物理学报(中文版)》2017,30(6):657-663
The microstructure of aqueous CuCl2 has been studied through lots of technologies for many years; however, it remains a controversial subject. In this study, a new spectroscopic method has been proposed to analyze the UV-visible spectra of thin film of CuCl2/H2O solutions at different concentrations. This method is the combination of ratio spectra, difference spectra and second order difference spectra. By using this method, two new bands at ~230 and ~380 nm are obviously observed. The bands are assigned as the contacted ion pairs[CuCl3(H2O)n]- or[CuCl4(H2O)n]2-, which demonstrates that ion pairs exist in the CuCl2/H2O solution. Such finding agrees with the recent theoretical spectra obtained by time-dependent density functional theory. Furthermore, the populations of the contacted ion pairs are discussed. This study not only offers the direct spectroscopic evidence of[CuCl3(H2O)n]- or[CuCl4(H2O)n]2- in aqueous CuCl2, but also suggests that the spectroscopic analysis method is powerful to extract the weak bands in a strong overlapping spectrum. 相似文献
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以N4-取代氨基硫脲与尿嘧啶-1-乙醛反应,合成了6种N4-取代氨基硫脲衍生物,并进行了抗菌活性测试。结果表明,当N4-取代基为对氯苯基(Ⅲ6)时,具有较高的抑制枯草杆菌活性,对八叠球菌、白色念珠菌、黄曲霉菌亦有一定活性。 相似文献
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Angela Šurca Vuk Boris Orel Goran Dražič Franco Decker Philippe Colomban 《Journal of Sol-Gel Science and Technology》2002,23(2):165-181
The sol-gel synthesis route, in combination with dip-coating deposition, was used for the preparation of FeVO4 films. TEM measurements of Fe/V (1 : 1)-oxide films heated at 400°C reveal that the films consist of a triclinic FeVO4-I and an orthorhombic FeVO4-II phases with a grain size of up to 50 nm. The electrochromic properties of the films were tested in 1 M LiClO4/propylene carbonate (PC) using various electrochemical techniques and in-situ UV-visible spectroelectrochemical measurements. The best compromise between the charge capacity per film thickness (Qd–1 = –0.14 mC cm–2 nm–1), electrochemical stability (>1000 cycles) and optical modulation (Tvis = 0.15) was achieved in the potential range of 4.80 to 1.80 V vs. Li, which suggests that FeVO4 films can be used as counter-electrodes in electrochromic devices.Extensive IR-spectroscopy studies of FeVO4 films in charged/discharged states revealed the following spectra changes: (i) small charging (–0.01 mC cm–2 nm–1) leads to a variation in the intensity of all the vibrational bands without shifting their frequencies, (ii) higher chargings bring about the intensity and frequency changes of bridging V—O···Fe and V···O···Fe stretchings showing that vanadium, and probably also iron, are involved in the insertion/extraction processes, (iii) below 500 cm–1 broad absorption appears due to the Li+—O modes, which also remained in the IR spectra of discharged (bleached) states revealing the irreversible lithiation, and (iv) charging to –0.30 and –0.50 mC cm–2 nm–1 leads to the amorphisation of the film structure. 相似文献
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4-Morpholinoacetophenone thiosemicarbazone, MAPT, and its nickel(Ⅱ) and copper(Ⅱ) complexes have been prepared and characterized by elemental analysis, magnetic susceptibility, spectral methods (FT-IR, ^1H NMR) and cyclic voltammetry. Electrochemical behaviors of the complexes have been studied by cyclic voltammetry in DMF media showing metal centered reduction processes for both of them. The redox properties, nature of the electrode processes and the stability of the complexes were discussed. [Cu(MAPT)2]Cl2 complex shows Cu(Ⅱ)/Cu(Ⅰ) couple and quasi-reversible wave associated with the Cu(Ⅲ)/Cu(Ⅱ) process. The reduction/oxidation potential values depend on the structures of complexes. Also, the antimicrobial activities of these complexes were determined against S. aureus, E. coli and B. subtilis. 相似文献