共查询到18条相似文献,搜索用时 147 毫秒
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合成了一类新型四酰胺杯[4]氮杂冠醚(5a, 5b), 用紫外和荧光光谱研究了主体与阴离子客体之间的识别性能. 主体分子5a或5b加入到对硝基酚氧阴离子的CHCl3溶液中, 主客体间形成超分子复合物使得客体阴离子423 nm处吸光度降低且溶液从黄色变为无色. 受体5a, 5b与p-NO2C6H4O-, F-, 相互作用, 荧光光谱发生变化, 并且对于p-NO2C6H4O-具有较好的选择性识别能力, 其荧光光谱强度改变强弱的顺序为p-NO2C6H4O->F->H2PO4->>Cl-, Br-, I-. 荧光光谱滴定的结果经非线性拟合, 结果表明主客体间形成1∶1络合物. 相似文献
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1,4-双{2-[4-[2-苯并恶唑)苯基]乙烯基}苯及衍生物的合成 总被引:4,自引:0,他引:4
通过Wittig-Horner反应,以对苯二甲醛和2—(4-氯甲基苯基)苯并恶唑为主要 原料,合成了八个新型1,4-双{2-[4-(2—苯并恶唑)苯基]乙烯基}苯及衍生物.通 过IR,^1H NMR,UV-vis和元素分析等方法确认了它们的化学结构,分析数据表明各 标题化合物分子结构中的C=C双键均为反式结构特. 相似文献
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设计并合成了两种多酰胺杯[4]芳烃中性阴离子受体(5, 6), 用IR, 1H NMR, MS及元素分析等对其结构进行了表征. 利用紫外-可见光谱(UV-vis)与1H NMR研究了其对不同阴离子(p-O2NPhOPO328722;, p-O2NPhO8722;, H2PO48722;, Ac8722;, Cl8722;, Br8722;及I8722;)的识别性能, 结果表明主体5和6对含芳环的阴离子(p-O2NPhOPO328722;, p-O2NPhO8722;)具有较好的选择识别性能, 主客体间通过多重氢键和π-π的相互作用形成了1︰1的络合物. 5和6对没有紫外吸收的阴离子(H2PO48722;, Ac8722;, Cl8722;)也呈现一定的键合能力, 为这类阴离子提供了一种简单的光谱测定方法. 相似文献
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首次合成一系列杯[10]冠醚。通过将对叔丁基杯[10]芳烃和乙二醇双对甲苯磺酸酯或多甘醇双对甲苯磺酸酯在K2CO3/甲苯或Cs2CO3/丙酮体系中反应,得到一系列杯[10]冠醚:1,2-杯[10]冠-4、1,3-杯[10]冠-2、1,2-,1,3-杯[10]冠-3、1,4-杯[10]冠-4、和1,6-杯[10]冠-4。 相似文献
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以对叔丁基杯[4]芳烃为原料,经碱催化合成了26,28-双(4,7-双甲氧基香豆素)-5,11,17,23-四叔丁基杯[4]-冠-6(2)。其结构经1H NMR,IR和元素分析表征,2为锥形结构。 相似文献
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联苯型[11], [14]和[17]环系氮杂支链套索冠醚的合成 总被引:4,自引:0,他引:4
以碳酸钾为缩合剂, 2,2'-二羟基联苯分别与二对甲苯磺酸酯Ⅱa~c, Ⅳb,Ⅵb反应合成尚未见文献报道的联苯型单氮杂冠醚(1~3), 二氮杂冠醚9和11。3,9和11分别用氢溴酸去对甲苯磺酰基得到亚胺型氮杂冠醚4, 10和12。4与溴代烃RBr(R=-(CH2)3CH3, -CH2CH=CH2, -(CH2)7CH3, -(CH2)2O(CH2)2OC4H9)反应分别合成[11]环系氮支套索冠醚(5~8), 12与正溴丁烷反应合成[17]环系氮支冠醚13。以上13种化合物皆为新型未见文献报道, 其结构皆经元素分析, IR, ^1H NMR,MS确证。 相似文献
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新型间苯二酚杯芳烃硫脲衍生物对阴离子的识别 总被引:1,自引:0,他引:1
通过间苯二酚杯芳烃连续三步反应, 以较高产率合成了分子中连有8个和12个硫脲端基的间苯二酚杯芳烃的酰胺衍生物. 用紫外可见光谱法研究了两个代表性化合物4,6,10,12,16,18,22,24-八[6-(苯基硫脲基)-己氨甲酰基甲氧基]-2,8,14,20-四苯基杯[4]间苯二酚芳烃(THBC)和4,6,10,12,16,18,22,24-八[2-(苯基硫脲基)-1-甲基乙基-1-氨甲酰基甲氧基]-2,8,14,20-四苯基杯[4]间苯二酚芳烃(TPBC), 对各种阴离子(AcO-, H2PO4-, HSO4-, H2PO42-, C12H25-C6H4-SO3-, Cr2O72-, B4O72-, Cl-, Br-)的识别性能, 结果表明它们对AcO-, H2PO4-, HSO4-等阴离子有较好的配位作用, 能形成1∶3的配合物. 相似文献
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Calix[4] (aza) crowns containing amide groups 3a-d were synthesized by the reactions of calix[4]arene (1a) or p-tert-butylcalix[4]arene (1b) with N, N'-ethylenebis(2-chloroac-etamide) (2a) or N, N'-1,2-phenylenebis(2-chloroacetamide) (2b) by one step procedure in yields of 85-90% . Calix[4]-(aza) crowns 4a-b could be obtained by the reduction of 3a-b with LiAlH4 in yields of 51 and 67% , respectively. The nitration of 3a or 3c afforded new chromogenic calix[4]arenes 5a bearing two nitrophenol moieties and 5c bearing one nitro-phenol and one quinone moiety, respectively. The ipso-nitrations of 3b and 3d were also studied. Both gave the products containing one nitrophenol and one quinone moiety. Moreover, a very interesting calix[4]arene derivative 5d containing one cyclohexadienone moiety was also separated as the main product when 3d was ipso -nitrated. 相似文献
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Three new chiral heterocalix [4] crowns containing aza thio atoms bearing two chiral sites provided by (R)‐cysteine ester were synthesized. All new compounds were characterized by 1H NMR, MS and elemental analysis. 相似文献
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The first examples of lariat calix[4]-1,3-aza-crowns with chiral amino acid groups as branched chains (5a and 5b) were designed and synthesized via a 1 + 1 addition reaction of calix[4]-1,3-substituted benzaldehyde derivative (4) and amino acid hydrazide derivatives (3a and 3b) in yields of 70% and 75%, respectively. The preliminary extraction experiments suggested that hosts 5a and 5b possessed good complexation abilities for α-amino acids. 相似文献
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Capillary electrophoresis (CE) can separate charged and neutral substances with high speed and efficiency. In this paper, utilizing meso-octamethylcalix[4]pyrrole, meso-tetraspirocyclohexylcalJx[4]pyrrole, bimethyl bi(2-pyrryl)- methane and 1,1-bi(2-pyrryl)cyclohexane as additives in capillary zone electrophoresis (CZE) electrolyte, their recognition ability to inorganic anions was discussed. The dipyrrylmethanes have better recognition ability than others. Their effects on separation of seven normal inorganic anions by CZE were studied. 相似文献
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MEI Gong-Xiong MEN Ling-Zhi HE Yong-Bing 《有机化学》2003,23(Z1):269-269
Anion recognitions have attracted considerable attention in supramolecular chemistry because of its possible ap plication in the field of biology and environment. [1] In recent years, considerable efforts have been devoted to the development of anion fluorescent and colorimetric sensors. [2] 相似文献
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报道了"一锅法"合成含两种桥联链的新型杯[4]双冠醚和双杯[4]冠醚.杯[4]芳烃先与N,N’-乙撑基-二(2-氯乙酰胺)发生"1+1"缩合反应,然后直接加入三甘醇双对甲苯磺酸酯继续进行"2+2"缩合反应,合成了含两种桥联链的新型双杯[4]冠醚4.按照相似程序,杯[4]芳烃先后与N,N’-乙撑基-二(2-氯乙酰胺)、溴乙酸乙酯和二乙烯三胺反应,得到含两种桥联链的新型杯[4]双冠醚5.化合物5进一步与异硫氰酸苯酯反应合成带硫脲支链的杯[4]双冠醚6.所有新化合物的结构与构象经元素分析、质谱、核磁共振谱等表征证实. 相似文献