共查询到16条相似文献,搜索用时 78 毫秒
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奋乃静(PPH)是吩噻嗪类抗精神病药,用于治疗精神分裂症及其他精神躁狂症,也可用于呕吐及严重焦虑的治疗。目前,测定奋乃静的方法有紫外分光光度法、高效液相色谱法、电化学法、毛细管电泳法、流动注射分析法、荧光光谱法、二阶导数光谱法和极谱法等。采用氯冉酸荷移分光光度法测定奋乃静尚未见文献报道,本工作利用奋乃静与氯冉酸的荷移反应,建立了荷移分光光 相似文献
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奎宁与氯冉酸的胶束增敏荷移反应及其测定 总被引:2,自引:0,他引:2
提出了一种基于胶束增敏荷移反应测定奎宁的光度分析法。研究了在阳离子表面活性剂氯化十六烷基吡啶 (CPC)胶束体系中电子给体奎宁与电子受体氯冉酸之间的荷移反应产物的光谱性质。发现CPC对奎宁与氯冉酸的荷移反应络合物的光吸收有显著的增强作用 ,使络合物的表观摩尔吸光系数提高了 2 .5倍(λmax=5 2 0nm ,ε=3.6 4× 1 0 3 L·mol-1 ·cm-1 )。奎宁浓度在 2 0~ 80 0mg/L范围内符合比耳定律 ,r =0 9991。本方法用于片剂中奎宁含量的测定 ,其回收率为 97.3%~ 99.2 % ;5次测定的相对标准偏差为 1 .6 %~ 2 5 %。 相似文献
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荷移光度法测定双嘧达莫 总被引:1,自引:0,他引:1
用光度法研究了双嘧达莫与氯冉酸之间发生的电荷转移反应,其中双嘧达莫是电子给予体,氯冉酸是电子接受体,反应介质是乙醇丙酮混合溶剂。应用等摩尔连续变换法和摩尔比法测得荷移络合物的组成为1∶1,稳定常数为3.9×104。络合物在526nm波长处有最大吸收,双嘧达莫浓度在10~380mg·L-1范围内服从比耳定律,相关系数为0.9996,表观摩尔吸光系数为1.34×103L·mol-1·cm-1,回收率为98.4%,测定结果的相对标准偏差为1.14%。应用该法可以快速测定双嘧达莫片中有效成分的含量,结果满意。 相似文献
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Khairia M. Al-Ahmary Moustafa M. Habeeb Areej H. Al-Obidan 《Physics and Chemistry of Liquids》2016,54(3):394-410
Charge transfer (CT) complexes formed between 2-amino-4-methylpyridine as electron donor, chloranilic acid as electron acceptor was investigated spectrophotometrically in acetonitrile (AN), methanol (MeOH) and binary mixture of acetonitrile 50% + methanol 50% (MeOH-AN). Minimum–maximum absorbance method has been used for estimating the formation constants of the CT reactions (KCT). Job’s method of continuous variation and photometric titration studies were used to detect the stoichiometric ratios of the formed complexes, and they showed that 1:1 complexes were produced. The molar extinction coefficient (e), oscillator strength (f), dipole moment (l), CT energy (ECT), ionisation potential (IP) and the dissociation energy (W) of the formed complexes were estimated; they reached acceptable values suggesting the stability of the formed CT complexes. The solid CT complexes were synthesised and characterised by elemental analyses, 1H NMR and FTIR spectroscopies where the formed complexes included proton and electron transfer. 相似文献
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An indirect titrimetric method for determination of phosphate is based on precipitation with excess of bismuth, and titration of the surplus with chloranilic acid, the end-point being determined biamperometrically. 相似文献
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A differential spectrophotometric method for the determination of tartrate using chloranilic acid is described. Standard and sample solutions containing slightly more tartrate than the reference solution, are measured relative to it. The procedure is applicable to the determination of tartrate in baking powder; the results obtained compared favorably with the official A.O.A.C. method. 相似文献
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Miroslaw Dworniczak 《Reaction Kinetics and Catalysis Letters》2003,78(1):65-72
Reaction of chloranilic acid with N-methylpiperidine in acetonitrile has been studied. The product of the reaction is an unusually stable anion radical of quinone.
The presence of radicals has been confirmed by EPR measurements. Stability constant, extinction coefficients and thermodynamic
reaction parameters are reported. Mechanism of the reaction is proposed.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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《Physics and Chemistry of Liquids》2012,50(4):490-505
Charge transfer (CT) interaction between 5-amino-2-methoxypyridine (5AMPy), as electron donor (proton acceptor), with 3,6-dichloro-2,5-dihydroxy-p-benzoquinone (chloranilic acid, H2CA), as electron acceptor (proton donor), has been investigated spectrophotometrically in the polar protic solvents ethanol (EtOH) and methanol (MeOH) and the aprotic one acetonitrile (AN). Pink-coloured solution is formed instantaneously upon mixing 5AMPy with H2CA solutions in all solvents, which is the hallmark evidence of CT complex formation. Based on Job’s method of continuous variations, as well as spectrophotometric titrations, the stoichiometry of the complex was found to be 1:1 [(5AMPy) (H2CA)] in all solvents. Benesi–Hildebrand equation has been applied to estimate the formation constant of the produced CT complex (KCT) and its molar absorptivity (ε), they reached high values, confirming the complex high stability. Solid CT complex has been synthesised and analysed by elemental analyses and FTIR, 1H NMR spectroscopies, where 2:1 [(5AMPy)2 (H2CA)] CT complex was obtained. 相似文献