共查询到17条相似文献,搜索用时 109 毫秒
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合成了新试剂5-[(4-乙酰氨基苯基)偶氮-8-氨基喹啉(AAPAQ),其结构经红外光谱和元素分析证实.光度法测定其酸离解常数pK_(■_2)=3.58.研究了非离子表面活性剂Twccn80存在下,试剂与钯的显色反应.在酸性介质中,钯与AAPAQ形成1:2的紫蓝色配合物,其最大吸收峰位于570nm,摩尔吸光系数为6.1×10~41.mol~(-1).cm~(-1)。钯量在0-18μg/25ml范围内符合比尔定律.方法简便、快速,可不经分离,直接用于钯催化剂中钯的测定. 相似文献
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以8-氨基喹啉为母体合成了5-[(3-磺羧基苯基)偶氮]-8-氨基喹啉(m-SPAQ)。在阳离子表面活性剂CT-MAB存在下,于pH8.3的缓冲溶液中,试剂与铜形成红色配合物,其最大吸收波长位于596mm,摩尔吸光系数为6.24×10~4L·mol~(-1)·cm~(-1),铜的量在0~20ug/25mL范围内符合比尔定律,此法用于铝合金中微量铜的测定,结果满意。 相似文献
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新显色剂5-(4-氨磺酰基苯基偶氮)-8-氨基喹啉的合成及其与钴的显色反应研究 总被引:2,自引:0,他引:2
合成了5-(4-氨磺酰基苯基偶氮)-8-氨基喹啉,并对其与钴的显色反应作了探讨。试验表明,在阳离子表面活性剂CTMAB存在下,于pH9.8的缓冲溶液中,试剂与钴形成紫红色配合物,其最大吸收波长位于606nm,摩尔吸光系数为7.08×104L·mol-1·cm-1,钴量在0~15μg/25ml范围内符合比耳定律,方法用于标样和VB中痕量钴的测定,结果满意。 相似文献
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5-碘[杯(4)芳烃偶氮]氨基喹啉光度法测钯 总被引:1,自引:0,他引:1
合成了新试剂5 碘[杯(4)芳烃偶氮]氨基喹啉(ICAQ),并研究了该试剂与钯显色反应条件。结果表明,在pH10.2~11.0的Na2CO3 NaHCO3缓冲介质中,在TritonX 100存在下,试剂与钯发生显色反应,生成1∶1稳定络合物。建立了测定钯的光度法新体系,λmax=625nm,ε=1.42×105L·mol-1·cm-1,钯质量浓度在0~0 80μg/mL内符合比尔定律。方法用于钯催化剂中钯的测定,结果与原子吸收法相符,平行6次测定的RSD在2.5%~3.0%。 相似文献
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8-氨基喹啉-5-位偶氮衍生物的合成及其与钯的显色反应比较研究 总被引:1,自引:0,他引:1
以8-氨基喹啉为母体合成了19个5-位偶氮衍生物,其中14个是新化合物。系统研究它们与钯的显色反应,发现了试剂取代结构对试剂及其络合物光度特性的影响规律。初步研究了MOPAQ及AAPAQ光度测钯的新体系,并与PAQ比较,诸条件得到改善。 相似文献
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5-[2-(5-甲基-1,3,4-噻二唑)偶氮]-8-羟基喹啉的合成及其与铜的显色反应研究 总被引:3,自引:0,他引:3
合成了新型偶氮显色剂:5-[2(5-甲基-1,3,4-噻二唑)偶氮]-8-羟基喹啉(简称MTADQ),并研究了它与铜的显色反应。实验结果表明:在pH 5.8~7.8的水溶液中该试剂与铜离子形成一种稳定的黄色络合物,其最大吸收波长位于530 nm处,表观摩尔吸光系数ε=9.5×104L.mol-1.cm-1,配合物的组成比为1∶1。铜离子质量浓度在0~1.2 mg/L范围内服从朗伯-比尔定律。已用于测定矿石样品中的微量铜。 相似文献
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LUO Yanan XU Xianzhu SUN Fuxing YU Xiaoyang ZHANG Xiao ZHANG Ting YU Liying 《高等学校化学研究》2014,30(1):27-31
Two new coordination polymers based on 4-[(8-hydroxy-5-quinolinyl)azo]-benzenesulfonic acid(H2L),{[CdL(H2O)2]·H2O}n(1) and {[CdL(en)]·EtOH}n(2)(en=ethylenediamine),were solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction.Compounds 1 and 2 exhibit infinite 1D ladder-shaped chain structures,which are isostructural except that the two coordinating water molecules in compound 1 were replaced by one en molecule in compound 2 due to the use of different organic base.Compounds 1 and 2 were constructed into different supramolecular frameworks by hydrogen bonding and π…π stacking interactions.In addition,the fluorescent properties of compounds 1 and 2 were investigated.Furthermore,they were also investigated via IR spectral analysis,elemental analysis,powder X-ray diffraction(PXRD) and thermogravimetric analysis(TGA). 相似文献
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7—[(4—甲基2—胂酸基苯)偶氮]—8—羟基喹啉—5—磺酸荧光光度法测定氟 总被引:1,自引:0,他引:1
本文介绍了7-[(4-甲基-2-胂酸基苯)偶氮]-8-羟基喹啉-5-磺酸的合成方法以及性能,详细研究了氟对该试剂与铝形成的荧光的熄灭作用,建立了荧光法测定微量氟的新方法。应用于水样和牙膏中的氟的测定,效果良好。 相似文献
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LUO Ya-nan XU Xian-zhu ZHANG Xiao YU Xiao-yang QU Xiao-shu YANG Yan-yan SHEN Qi-hui 《高等学校化学研究》2013,29(6):1045-1049
One new coordination polymer based on 4-[(8-hydroxy-5-quinolinyl)azo]-benzoic acid(H2L), { [CdL(H20)]·H2O}n(1) was solvothermally synthesized and structurally characterized by single-crystal X-ray diffrac- tion, infrared spectrometry, elemental analysis, powder X-ray diffraction(PXRD) and thermogravimetric analysis (TGA). In compound 1, L2- ligands link Cd(II) to form a sinusoidal ruffling layer, in which the carboxylic groups connect Cd(II) into an infinite Cd--O chain. And the layers are further stabilized by hydrogen bonding and π-π in- teractions, forming a three-dimensional(3D) supramolecular network. In addition, the fluorescent property of compound 1 was also investigated. 相似文献
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Zeng Zuotao 《Mikrochimica acta》1994,116(1-3):157-163
The synthesis and analytical application of 5-(4-carboxylphenylazo)-8-aminoquinoline (CPAQ) are described. A simple, rapid, selective, and sensitive spectrophotometric method for the determination of microgram amounts of gold is developed, based on the colour reaction between the metal ion and CPAQ in the presence of cetyltrimethyl ammonium bromide. Gold (III) reacts with the reagent in the ratio 1 3 (metal to ligand) in alkaline solution to form a blue-green complex with an absorption maximum at 608 nm. Beer's law is obeyed over the concentration range 0–1.8 g · ml–1 (ppm) of gold. The molar absorptivity and Sandell's sensitivity of the method are 9.11 × 104 l · mole–1 · cm–1 and 0.00216 g · cm–2, respectively. The interference of various ions has been studied and conditions were developed for the determination of gold in an ore and anode slimes. 相似文献
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A new thiazolylazo chromogenic reagent, 2-[2-(6-methylbenzo-thiazoly)azo]-5-diethylaminobenzoic acid (6-Me-BTAEB), has been synthesized. Its chromogenic reaction with microamounts of nickel in the presence of sodium dodecylsulfate (SDS) has been thoroughly studied. 6-Me-BTAEB reacts with nickel(II) in weak acid medium containing appropriate amounts of SDS to form a blue-violet complex with high sensitivity, good selectivity and high stability. The composition is found to be 1:2 (nickel to 6-Me-BTAEB) and its absorption maximum is at 650 nm with an apparent molar absorptivity of 1.67 × 105l mole–1 cm–1. Beer's law is obeyed over the range 0-0.4 g of nickel per ml. The proposed method has been applied to the direct determination of nickel in aluminium alloys, pure magnesium and low alloy steels at the 0.2–0.3% (w:w) level with satisfactory results. 相似文献