共查询到19条相似文献,搜索用时 109 毫秒
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本文合成新手性配体正十二烷基-L-羟基脯氨酸,研究手性配体正十二烷基-L-羟基脯氨酸与Cu髤配位萃取拆分苯丙氨酸的性能和机理,考察起始氨基酸浓度、配位铜离子浓度、萃取剂浓度、溶液pH值及温度等因素分别对D-和L-苯丙氨酸萃取性能的影响,萃取剂对D-苯丙氨酸的识别能力强。利用多种手段对萃合物的组成进行表征,推测萃合物的结构为1∶1∶1型三元配合物。对比发现:该萃取剂配位萃取拆分苯丙氨酸性能优于正辛基-L-羟基脯氨酸,空间位阻效应反而对拆分有利。 相似文献
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以煤油/辛醇(7:3,V/V)为稀释剂,研究N,N′-二甲基-N,N′-二辛基-3-氧戊二酰胺(DMDODGA)从盐酸介质中萃取三价镧系金属的性能及反应机理;考察了水相盐酸浓度、萃取剂浓度及温度对其萃取性能的影响。结果表明分配比在所研究酸度范围内随盐酸浓度的增加先增大后减小;随萃取剂浓度的增加而增大;萃合物的组成为MCl3.2DMDODGA(M=Sm,Gd,Dy)或MCl3.DMDODGA(M=Er,Lu)。萃取过程为放热反应,升高温度不利于萃取。同时计算出了萃取反应的平衡常数及热力学函数。萃合物的红外光谱表明羰基氧、醚氧均与镧系离子配位。 相似文献
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PTSO萃取金(Ⅲ)的性能和机理的研究 总被引:1,自引:0,他引:1
本文研究了PTSO革取金的性能和机理,得出分配比随水相酸度和盐效应的增加而增加,随反应温度的升高而降低,计算了苹取反应热△H,测定了萃合物组成比为Au:H:Cl:PTSO=1:1:4:3.通过萃合物电导率测定以及萃合物紫外光谱和红外光谱的研究,推断出萃合物的结构和萃取反应机理。 相似文献
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在不同稀释剂体系中研究了N,N,N′,N′-四丁基-3-氧戊二酰胺(TBDGA)从硝酸介质中萃取Gd髥离子的性能及反应机理。考察了水相硝酸浓度、萃取剂浓度及温度对其萃取性能的影响。实验表明在不同稀释剂中TBDGA对Gd髥的萃取能力为:二甲苯四氯化碳甲苯氯仿,分配比在所研究酸度范围内都随硝酸浓度的增加而增大。在不同稀释剂中萃取机理是相同的,萃合物的组成为Gd(NO3)3·3TBDGA;萃取Gd(Ⅲ)离子的反应为放热反应,低温有利于萃取。萃合物的IR光谱表明羰基氧与Gd(Ⅲ)发生配位。 相似文献
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N,N,N‘,N’—四己基丙二酰胺从硝酸介质中萃取铀(Ⅵ) 总被引:2,自引:1,他引:2
以甲苯为稀释剂研究了N,N,N',N'-四己基两二酰胺从硝酸介质中萃取硝酸和铀(Ⅵ)的性能.考察了水相硝酸浓度、李取剂浓度、硝酸钠浓度以及温度对萃取分配比的影响,确定了萃合物的组成.借助红外光谱分析了萃合物的结构.求得了萃取硝酸和硝酸铀酰的平衡常数及反应的热力学焓变.与N,N,N',N'-四丁基丙二酰胺萃取铀的性能比较,发现烷基链长的增加减少了三相生成的倾向,但酰胺的萃取能力却下降. 相似文献
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Vaibhav B. Valodkar Gopal L. Tembe Marayil Ravindranathan Rajnath Ram Hoskote S. Rama 《Reaction Kinetics and Catalysis Letters》2003,80(2):285-291
L-phenyl alanine was anchored to P(S-DVB) resin and its complex with PdCl2 was prepared. The newly synthesized catalyst was found to be a versatile and recyclable catalyst for the hydrogenation of
1-octene and acetophenone. This chiral catalyst induced moderate enantioselectivity during the asymmetric reduction of acetophenone.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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Javad Safaei-Ghomi Fahime Eshteghal Hossein Shahbazi-Alavi 《Journal of the Iranian Chemical Society》2018,15(3):661-669
In the present paper, L-phenyl alanine has been successfully linked on the surface of magnetic nanoparticles and has been characterized by FT-IR, XRD, SEM, EDS, TGA, and VSM techniques. This new catalyst was employed for one-pot synthesis of chromenes through the reaction of aldehydes, 4-hydroxycoumarin, and 2-hydroxynaphthalene-1,4-dione. Significant features of this method are short reaction time, excellent yields, use of green method, and the use of an effective and novel catalyst that could be recovered and reused several times without loss of its catalytic activity. 相似文献
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提出一种利用萃取法间接测定Lewis碱性萃取剂碱度的简便方法, 选择常用的Lewis碱性萃取剂TOA/正辛醇和TRPO/煤油, 测定了其碱度, 为今后络合萃取剂的选择及其机理的研究提供理论指导. 相似文献
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The solvent extraction of U(Ⅵ) from nitric acid solution was studied with one new extractant, 4-p-methylbenzoyl-2,4-dihydron-5-methyl-2-phenyl-pyrazol-3-thione (HMeBMPPT), synthesized via acylation, chlorination and sulfurication of the starting material 1-phenyl-3-methyl-pyrazolone-5(PMP) in high yield. The structure of the new extractant was confirmed by means of elemental analysis, MS, 1H NMR and X-ray diffraction. The effects of diluent, temperature, the concentrations of nitric acid, and the concentration of extractant on the extraction were investigated and the extraction mechanism is suggested. 相似文献
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Yu. G. Elistratova A. R. Mustafina D. A. Tatarinov V. F. Mironov A. I. Konovalov 《Russian Chemical Bulletin》2009,58(11):2222-2227
A procedure of micellar extraction of the lanthanide ions (La, Gd, and Lu) from nitric acid media based on the use of novel
phosphine oxide derivatives is developed. In the micellar extraction, complexes of the lanthanide ions with the extractant
in the ratio of 1 : 2 (metal : extractant) form. The dependence of the selectivity of extraction on the length of hydrophobic
radicals attached to the P=O group was shown. The conditions of the selective micellar extraction in the series La > Gd >
Lu with the use of an extractant containing octyl substituents at the P=O group were found. 相似文献
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Yang Xing-Cun Bao Bo-Rong Cao Wei-Gou Sun Guo-Xin Li Zhen 《Journal of Radioanalytical and Nuclear Chemistry》2001,250(3):559-561
A novel extractant, N,N-dilauroylpiperazine (DLPEZ), was synthesized for the first time. The extraction of uranium(VI) with the novel extractant in carbon tetrachloride from aqueous nitric acid media has been studied. The dependence of extraction distribution ratio on the concentration of aqueous nitric acid, extractant, salting-out agent and temperature was investigated and the enthalpy of the extraction was determined. 相似文献
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Sabita Nayak Priyabrata Pattanaik Deepak Ranjan Mishra Pravati Panda Bishnuprasad Raiguru 《合成通讯》2019,49(14):1823-1835
An expedient one-pot sequential three-component synthesis of a series of diverse spiroindenoquinoxaline pyrrolidine fused nitrochromene derivatives following 1,3-dipolar cycloaddition of azomethine ylides generated in situ by the condensation of indenoquinoxalone and α-amino acids (L-proline and L-phenyl alanine) with 3-nitrochromenes as dipolarophile under classical as well as microwave irradiation is described. The protocol provides a mild reaction condition, high yield of the products, high regioselectivity, and operational simplicity to assemble complex structural entity in a single operation with good to excellent yield. The regio and stereochemical outcome of the cycloaddition reaction is ascertained by spectroscopic and single crystal X-ray analysis. 相似文献
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采用单因素实验与正交实验法结合,以提取剂浓度、固液比、微波功率、微波提取时间为考察因素,以熊果酸提取率作为评价指标,优化了熊果酸的微波提取工艺。最优微波提取条件为:90 % 乙醇作为提取剂、料液比1∶20 g/mL、微波功率250 W、微波提取时间120 s。 相似文献
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This paper reports on solvent-extraction studies of Ni(II) from sulfate solutions with LIX 84I (2-hydroxy-5-nonylacetophenoneoxime) as the extractant. The extraction of metal depends on the equilibrium pH of the aqueous phase and the extractant concentration. The transfer of metal follows a cation exchange-type mechanism: Ni2+ + 2HA --> NiA2 + 2H+. Extraction varies with the nature of the diluents. Temperature has no effect on the extraction of metal. The extraction behavior of associated metals clearly demonstrates the application of LIX 84I as the extractant for the separation of Cu(II), Ni(II) and Zn(II). Based on the results, a flow sheet of the process was developed. 相似文献