Synthesis of new chromogenic calix[4]crowns and molecular recognition of alkylamines
摘要:
A new type of calix[4]crown containing ester group 3 has been synthesized and selectively nitrated to give 4 or ipso-nitrated to give 6. By nitration a novel calixcrown 5 containing a quinone segment was obtained. These nitrated calixcrowns have been used as chromogenic hosts for complexing alkylamines and the factors affecting recognition are discussed. (C) 1997 Elsevier Science Ltd.
A novel fluorescence sensor for K + based on bis-Bodipy: The ACQ effect controlled by cation complexation of pseudo crown ether ring
作者:Zhenxi Yan、Xiaoru Lin、Hongyu Guo、Fafu Yang
DOI:10.1016/j.tetlet.2017.06.065
日期:2017.8
complexation of pseudo crown ether ring was confirmed by the fluorescent titrations, complexation FT-IR spectra, complexation 1H NMR spectra, complexation ESI-MS spectra and contrast experiment of similar mono-Bodipy derivative. The K+ was binded in the cavity of a pseudo crown ether ring, leading to the closed distance for two Bodipy units and then enhancing the ACQ effect obviously. Both the structure of the
制备了三种新型的双-Bodipy 3a-3c与冠醚链桥接,产率为70-78%。它们对十四种金属离子的络合吸收和荧光光谱表明,化合物3b对K +表现出选择性反应,并具有明显的ACQ效应。化合物3b与K +的缔合常数为4.3×10 5 M -1,并推导出1:1的复数模式。通过荧光滴定,络合FT-IR光谱,络合1证实了由伪冠醚环的阳离子络合控制的ACQ效应的络合机理。相似的单-Bodipy衍生物的1 H NMR光谱,络合ESI-MS光谱和对比实验。K +结合在假冠醚环的空腔中,导致两个Bodipy单元的封闭距离,从而明显增强了ACQ效应。冠醚链的结构和两个Bodipy单元都是决定K +选择性荧光传感器的决定性因素。
Antibacterial Activities of Five Cationic Gemini Surfactants with Ethylene Glycol Bisacetyl Spacers
作者:Shengnan Guo、Xiaowen Sun、Qichao Zou、Jinzhi Zhang、Hong Ni
DOI:10.1007/s11743-014-1620-3
日期:2014.11
A series of cationicgeminisurfactants containing two dimethylalkylammonium chains linked by ethyleneglycolbisacetylspacers were synthesized [Gm‐AnA‐m, G = geminisurfactant, m = 12 (–C12H25), 14 (–C14H29), or 16 (–C16H33), A = acetyl, and n = 2, 3, or 4 is the number of ethyleneglycol units in the spacers]. Because of the inductive effect of the oxygen atom in the spacer, acylation can take place
一系列含有由乙二醇bisacetyl间隔物连接的两个dimethylalkylammonium链合成阳离子双子表面活性剂[G米-A Ñ A-米,G =双子表面活性剂,米= 12(-C 12 H ^ 25),14(-C 14 ħ 29)或16(–C 16 H 33),A =乙酰基,n= 2、3或4是垫片中的乙二醇单元数]。由于间隔物中氧原子的感应作用,可以使用氯乙酰氯代替溴乙酰溴来进行酰化反应,这有助于限制对环境有害的试剂的使用。使用电导率测量确定临界胶束浓度。表面活性剂对革兰氏阳性菌金黄色葡萄球菌和革兰氏阴性菌大肠杆菌的抗菌活性从最小抑菌浓度(MIC),最小细菌浓度,时间杀灭研究和抑菌圈进行评估。增加间隔物的长度不会导致明显的抗菌活性变化。然而,增加烷基链的长度显然增加了对金黄色葡萄球菌的抗菌活性,但是降低了对大肠杆菌的抗菌活性。对于g 12-A2A-12表面活性剂具有1.26毫摩尔L中的最低CMC
Bis-biphenylacrylonitrile bridged with crown ether chain: a novel fluorescence sensor for Fe<sup>3+</sup> in aqueous media
作者:Haifeng Ma、Rongqin Wu、Jie Xiong、Hongyu Guo、Fafu Yang
DOI:10.1039/d0nj02412k
日期:——
The design and synthesis of novel fluorescence sensors for Fe3+ in aqueous media have important prospects for practical applications. In this work, the novel bis-biphenylacrylonitrile bridged with crownether chains 3a–3c were prepared in yields of 73–80%. Compounds 3a–3c exhibited high fluorescence in aqueous media based on the AIE effect. The sensing abilities for a series of metal ions suggested
用于水介质中Fe 3+的新型荧光传感器的设计与合成在实际应用中具有重要的前景。在这项工作中,制备了用冠醚链3a-3c桥联的新型双联苯丙烯腈,收率73-80%。基于AIE效应,化合物3a-3c在水性介质中显示出高荧光。对一系列金属离子的感测能力表明,化合物3b具有强荧光猝灭作用,可选择性检测水性介质中的Fe 3+。化合物3b对Fe 3+的检出限为1.67×10 -7通过1 H NMR和MS研究提出了M和传感机理。化合物3b在活细胞系统中表现出优异的荧光成像性能,并具有对Fe 3+的传感能力,表明在水性介质和复杂环境中传感Fe 3+的良好应用前景。
Regioselective Bridging of Calixarenes − Syntheses, Structural Elucidation and Extraction Studies of 1,2-Calix[n]dioxocrowns (n = 6, 8)
ester-containing 1,2-bridged calix[n]crowns (n = 6,8) have been synthesized in reasonable yields by treating p-tert-butylcalixarenes with oligoethylene glycol bischloroacetates in the presence of K2CO3. It was found that K2CO3 not only acts as a weak base, but also plays the role of template. The template effect is based on the formation of a real active speciesderivedfrom the bischloroacetates and
一系列含酯基-1,2-桥杯的[ Ñ ]冠(Ñ = 6,8)一直在合理的产率合成通过处理p -叔-butylcalixarenes与低聚乙二醇bischloroacetates在K的存在2 CO 3。发现K 2 CO 3不仅起弱碱作用,而且还起模板作用。模板效应基于形成自二氯乙酸盐和K +的真实活性物质的形成。。双氯乙酸酯中的间隔基越长,模板作用越强,产率越高。所获得的1,2-杯[6]二恶英对碱金属和铵阳离子的萃取能力优于1,2-杯[6] cro-5。首次研究了杯[8]冠的络合能力。
Selective Bridging of Calix[6]arene: Synthesis of 1,2-Calix[6]dioxocrowns
作者:Yuanyin Chen、Fafu Yang
DOI:10.1246/cl.2000.484
日期:2000.5
Treating p-tert-butylcalix[6]arene with oligoethylene glycol bischloroacetates, a series of ester-containing 1,2-bridged calix[6]crowns have been synthesized in reasonable yields for the first time. The longer the spacer in bischloroacetates, the higher the yield. The extraction ability towards alkali metal and ammonium cations of the obtained 1,2-calix[6]dioxocrowns are superior to that of 1,2-calix[6]crown-5.