共查询到16条相似文献,搜索用时 62 毫秒
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通过杯芳烃的酚羟基的直接烃基化反应,在杯芳烃的下缘引入2,3′-二甲基-4-氨基偶氮苯发色团,得到了一系列杯芳烃偶氮衍生物(n=4,6,8)a-c.研究了它们对碱金属,碱土金属及过渡金属等十种金属离子的萃取作用.结果表明此类杯芳烃偶氮衍生物对过渡金属离子有良好的选择性识别作用,其中空腔较大的杯[8]芳烃偶氮衍生物c的萃取效果尤为显著. 相似文献
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用一锅法合成了4种磺酸酯桥联杯芳烃化合物,用它们作萃取剂,以氯仿为溶剂,用原子吸收的方法测定了它们对水溶性的Ca2+、Pb2+及部分过渡金属10种金属盐的萃取作用。 结果表明,此类杯芳烃对Cr3+、Cd2+和Co2+等几种有毒有害的离子有良好的选择性识别作用,其中化合物2a对Cr3+、化合物2b对Cd2+的萃取率分别达到了50.15%和46.48%。 相似文献
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新一代大环化合物杯芳烃(calixarcne)的研究已引起广泛的兴趣,它是由酚环和亚甲基组成的环多聚体,其结构呈杯状.杯底OH及杯盖R基可被各种基团取代,在其环形结构中具有适当体积的洞穴,在此空穴中能容纳客体而形成主客体配合物,可模拟酶催化的初始过程,在催化及分析分离等方面也有广泛的应用.但杯芳烃的配位化学研究很少,本文首先合成了对叔丁基杯[4]芳烃、对叔丁基杯[6]芳烃及对叔了基杯[8]芳烃(分别简称杯[4]、杯[6]及杯[8]),研究它们对铜的萃取,并探讨了萃取机理. 相似文献
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以对叔丁基苯酚为原料,经逐步反应在对叔丁基杯[4]芳烃的下缘引入含卤素的基团,得到了一系列含卤素的杯[4]芳烃衍生物(记为1,2,3,4);利用核磁共振谱和气相色谱-质谱证实了目标产物的结构;并评价了产物对水中的Cr3+、Cu2+、Ag+的萃取性能.结果表明:杯[4]芳烃衍生物2、3和4分别对Cr3+、Cu2+和Ag+具有较好的萃取效果. 相似文献
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新一代大环化合物杯芳烃(calixarcne)的研究已引起广泛的兴趣,它是由酚环和亚甲基组成的环多聚体,其结构呈杯状.杯底OH及杯盖R基可被各种基团取代,在其环形结构中具有适当体积的洞穴,在此空穴中能容纳客体而形成主客体配合物,可模拟酶催化的初始过程,在催化及分析分离等方面也有广泛的应用.但杯芳烃的配位化学研究很少,本文首先合成了对叔丁基杯[4]芳烃、对叔丁基杯[6]芳烃及对叔了基杯[8]芳烃(分别简称杯[4]、杯[6]及杯[8]),研究它们对铜的萃取,并探讨了萃取机理. 相似文献
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在丙酮溶液中以碳酸铯为催化剂,以硫代杯[8]芳烃(thiacalix[8]arene,TC8A)和N,N-二乙基-2-氯乙酰胺为底物,对TC8A的下缘进行修饰合成了一种新的TC8A衍生物--硫代杯[8]芳烃二乙基乙酰胺[TC8A-CH2CON(CH2CH3)2].对含有9种金属离子的汽车尾气净化催化剂溶液进行萃取研究表明,在pH为3.0的萃取液中TC8A对其中的钯离子具有最高的选择性萃取能力,萃取率可达99.3%,TC8A-CH2CON(CH2CH3)2对其中的锆离子具有最高的选择性识别能力,萃取率可达96.7%. 相似文献
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杯芳烃吡啶衍生物作为液膜载体对金属离子的选择传质 总被引:3,自引:0,他引:3
超分子化学主要研究以非共价键弱相互作用力结合的分子聚集体体系,分别识别作为超分子化学的基础,是目前研究的热点.冠状化合物、天然和修饰环糊精以及环番等主体的分子识别已被广泛研究,而杯芳烃等人工合成受体体系的分子识别研究还相对有限.杯芳烃,正如环糊精一样,起源于19世纪,但直到70年代末,Gutsche对其大小可调的空腔产生兴趣,设想可以用来作为广泛的人工酶模型,对其合成方法进行了深入研究,优化出合成路线,可以方便地制备较大量的价廉样品,从而启动了杯芳烃化学的发展[1]....... 相似文献
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新型主体分子噻唑偶氮基杯[n]芳烃衍生物的合成及其对重金属离子的识别 总被引:14,自引:0,他引:14
以2-氨基噻唑为原料,经重氮化-偶联反应合成了5,11,17,23-四(2-噻唑)偶氮基-25,26,27,28-四羟基杯[4]芳烃和5,11,17,23,29,35-六(2-噻唑)偶氮基-37,38,39,40,41,42-六羟基杯[6]芳烃,产物的结构经IR,^1H NMR和元素分析表征;研究了它们的光谱性能和对金属离子的识别状况,发现在pH=7.2的Tris介质中对Ag^ 和Hg^2 等有较好的光谱变化识别。 相似文献
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ChaoGuoYAN YunGE 《中国化学快报》2004,15(9):1019-1021
Three different synthetic routes were developed to introduce carbamoyloxy functional groups at the upper periphery of two calix[4]resorcinarenes. By treating activated esters 2a-b with excess corresponding amine such as 3-(dimethylamino)propylamine 3, ct-phenethylamine 4 and triethylenetetramine 5, six amide derivatives 6a-8b were obtained in high yield (Route 1). The pyridine-linked amide derivatives 9a-b were prepared by using acid chloride intermediate (Route 2).The amide derivatives 10a-b were obtained in moderate yields by direct alkylation of phenolic hydroxyl groups of la-b with N,N-dipropylchloroacetoamide in the presence of K2CO3/KI in acetone (Route 3). 相似文献
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Yuanyin Chen Shuling Gong 《Journal of inclusion phenomena and macrocyclic chemistry》2003,45(3-4):165-184
Bridging including capping of calix[6]arene is not only an importantroute to synthesize new host molecules, but also an efficient route to reduce the mobility of conformationof calix[6]arene. This article reviews the syntheses, conformations and complexation behavior of this kindof host molecules. 相似文献
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M.R. YAFTIAN M. Burgard A. El Bachiri D. MATT D. Wieser C.B. DIELEMAN 《Journal of inclusion phenomena and macrocyclic chemistry》1997,29(2):137-151
The solvent extraction properties towards Ag+ of5,11,17,23-tetra-tert-butyl-25,27-diX-26,28-bis(diphenylphosphinoylmethoxy)calix[4]arenes (X = CH2C(O)NEt2 (1), CH2P(O)Ph2 (2), CH3 (3), CH2C(O)Et (4))have been studied. Each ligand forms a 1 : 1 complex with silver(I). Ligand1, which bears two amide functionalities, is the most efficacious,emphasizing the crucial role played by the polar amide groups. The rate oftransport of AgNO3 through a bulk liquid membrane with this ligand ascarrier was shown to be superior to that of DC18C6, a structurally-relatedmulti-oxygen donor carrier. NMR and IR data suggest that Ag+ is coordinatedto each of the oxygen atoms in the ligand leading to an encapsulatedstructure [Ag 1]+. 相似文献
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G. Montavon G. Duplatre N. Barakat M. Burgard Z. Asfari J. Vicens 《Journal of inclusion phenomena and macrocyclic chemistry》1997,27(2):155-168
The extraction of sodium and potassium ions by 25,27-dicarboxymethyl-26,28-dimethoxy-5,11,17,23-tetra-tert-butyl calix[4]arene (L1H2) in chloroform shows the formation of MLIH and M2LI complexes (M = Na, K). In 1,2-dichloroethane, the MLIH species are formed in the acidic pH range, while only the Na2LI species is found at high pH values. The corresponding extraction equilibrium constants K11 (M) and K21 (M) have been evaluated and show a selectivity in favour of Na+ as compared to K+, whatever the nature of the complexes. In chloroform, this selectivity is much more pronounced considering the 2 : 1 complexes: K11(Na)/K11(K) K21(Na)/K21(K).The coexistence of 1 : 1 and 2 : 1 metal : ligand complexes is also shown in the extraction of sodium in 1,2-dichloroethane by the 25,27-dicarboxymethyl-26,28-dimethoxyethoxy-5,11,17,23-tetra-tertbutyl calix[4]arene (LIIH2), locked in the cone conformation.Structural data of the complexes are discussed on the basis of 1H-NMR spectra. In particular, for LIH2, a conformational change from cone to partial cone upon metal complexation has been evidenced for the complexes KLIH, K2LI and Na2LI. 相似文献