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1.
刘阁  邵杰 《无机化学学报》2011,27(4):731-736
设计合成了一种基于4-甲基-1-羟基二苯甲酮对硝基苯腙的比色和比率荧光阴离子受体1。此类受体以羟基和腙单元为识别位点,以硝基苯基为信号报告基团。向受体1的DMSO溶液中加入AcO-、H2PO4-、F-后,溶液颜色由黄色变为紫红色,而加入所研究的其它阴离子则无变化,从而实现对AcO-、H2PO4-、F-这三种离子的裸眼识别。利用紫外-可见吸收光谱、荧光光谱考察了其与AcO-,H2PO4-,F-,Cl-,Br-,I-等阴离子的识别作用。1H NMR滴定为受体分子与阴离子之间氢键作用本质提供了有力证据。  相似文献   

2.
A new anion receptor bearing phenolic hydroxy group based on 3,5-ditertbutylsalicylaldehyde-p-nitrophenylhydrazone (1) was designed and synthesized. Upon addition of AcO- and F-, the receptor exhibited visible color changes from deep yellow to purple. However, no obvious color changes were observed on addition of the other anions tested (H2PO4-, Cl-, Br-, I-). The binding properties of the receptor with anions such as AcO- and F- were investigated by UV-Vis and fluorescent titrations. The result indicated that the receptor 1 had a higher affinity to AcO- and F- and a 1:1 host-guest complex was formed through H-bond interactions between 1 and anions.  相似文献   

3.
采用密度泛函理论的M06-2X/6-31G(d, p)方法对杯[4]吡咯(CP)与卤素离子(X-=F-, Cl-, Br-)及卤素-铵根离子对的各种可能组装体系进行了系统研究. 详细讨论了各体系的结构、结合能、自然键轨道分析(NBO)和Multiwfn波函数分析的情况. 结果显示杯[4]吡咯与卤素阴离子的相互作用主要是氢键, 波函数分析显示在CPCl-和CP-Br-复合物中长程范德华力和空间位阻作用也明显存在. 杯[4]吡咯能与卤素-铵根离子形成稳定的复合物, 主要通过氢键作用、阴-阳离子的静电作用以及阳离子-π相互作用.从理论上探讨了杯[4]吡咯与离子或离子对的2:1组装体系,但相对于1:1组装体系来讲, 2:1体系并不占优势.本文结果进一步表明, 杯[4]吡咯不仅是一种阴离子受体,而且也是一种良好的离子对受体,尤其是对涉及氟离子的客体,更是如此.  相似文献   

4.
A novel 1,3-di(2′,4′-dinitrophenylhydrazone)-5-nitrobenzene receptor has been synthesized by simple steps with good yields. The anion recognition properties were studied by ultraviolet-visible (UV-Vis) spectroscopy. The results showed that the receptor had a higher affinity to F?, CH3COO? and H2PO 4 ? , but no evident binding with Cl?, Br?, and I?. Upon addition of the three former anions to the receptors in dimethyl sulphoxide (DMSO) at 298.2 ± 0.1 K, the solution exhibited an obvious color change from yellow to mauve that could be observed by the naked eye, thus the receptor could act as a fluoride ion sensor even in the presence of other halide ions. The UV-Vis data indicates that a 1:1 stoichiometry complex formed through hydrogen-bonding interactions between receptor and anions. The hydrogen bond between phenylhydrazone –NH and acetate or fluoride anion was determined on the basis of 1H nuclear magnetic resonance (NMR) experiments.  相似文献   

5.
The article describes the syntheses and extraction properties of a new calixarenebased extractant 5, which has been synthesized from5,11,17,23-tetra-tert-butyl-25,27-bis(chlorocarbonyl-methoxy)-26,28-dihydroxycalix[4]arene(4) by treatment with isoniazid (isonicotinic acid hydrazide) in the presence ofpyridine. The compound 5 was converted to its methyl iodide salt (6) by refluxing 5 with methyl iodide in acetonitrile. In this synthesis it was thought to explore the role of pyridinium sites in the extraction of HCr2O 7 - /Cr2O 7 2- anions. The complexing properties of 5 toward selected alkali/transition metal cationsand HCr2O 7 - /Cr2O 7 2 - anions are reported. It has been observed that receptor 5 does not extract alkali metal cations but shows an excellent selectivity toward transition metals. The protonated pyridinium form of 5 is an effective formfor transferring the HCr2O 7 - /Cr2O 7 2- anions from an aqueous into adichloromethane layer.  相似文献   

6.
Our observations that 1-[2-[(9-anthracenylmethylamino)ethyl)-4,7,10-tris[(2S)-2-hydroxy-3-phenoxypropyl]-1,4,7,10-tetraazacyclododecane, L1, complexes Cd(II) to form fluorescent [CdL1]2+ which undergoes a fluorescence change when it acts as an aromatic anion receptor complex has caused us to explore further the potential development of an interesting sequestration/sensor system. Accordingly, three new, octadentate, fluorescent, macrocyclic ligands, 1-[2-[(9-anthracenylmethyl)((2S)-2-hydroxy-3-phenoxypropyl)amino]ethyl]-4,7,10-tris[(2S)-2-hydroxy-3-phenoxypropyl]-1,4,7,10-tetraazacyclododecane, (L2), 1-[2-[(9-anthracenyl-methyl)((2S)-2-hydroxy-3-(4??-methyl)phenoxypropyl)amino]ethyl]-4,7,10-tris[(2S)-2-hydroxy-3-(4??-methyl)phenoxypropyl]-1,4,7,10-tetraazacyclododecane, (L3), and 1-[2-[(9-anthracenylmethyl)((2S)-2-hydroxy-3-(4??-t-butyl)phenoxypropyl)amino]ethyl]-4,7,10-tris[(2S)-2-hydroxy-3-(4??-t-butyl)phenoxypropyl]-1,4,7,10-tetraazacyclododecane, (L4), have been prepared with a view to using their metal complexes to study aromatic anion sequestration. The eight-coordinate Cd(II) complexes of L2 and L3, [CdL2](ClO4)2·5H2O and [CdL3](ClO4)2·2H2O·2Et2O are both capable of acting as receptors for a range of aromatic oxoanions. This is demonstrated by perturbation of the anthracene derived fluorescence emission intensity as the guest aromatic oxoanion and the receptor complex combine. In 20% aqueous 1,4-dioxane the receptor complex/aromatic oxoanion association constants are in the range of 103.2 M?1 (guest = p-hydroxybenzoate) to 107.3 M?1 (guest = 3,4,5-trihydroxybenzoate).  相似文献   

7.
酰腙类化合物的合成和阴离子识别研究   总被引:1,自引:2,他引:1  
本文设计合成了3种新型的酰腙类受体分子。利用紫外-可见吸收光谱及 1H NMR考察了其与F-、Cl-、Br-、I-、CH3COO-、HSO4-、NO3-等阴离子的作用。结果表明,该类受体分子能较好地识别阴离子F-和CH3COO-,在DMSO溶液中主客体之间形成氢键加合物。尤其对于受体3(间苯双对硝基苯氧乙酰腙),加入F-和CH3COO-时,溶液颜色有明显变化,受体3对这两种阴离子可实现裸眼识别。  相似文献   

8.
A new urea-based receptor was designed to selectively recognize H2PO4among other anions (such as F-, Cl-, Br-, I-, OH-, AcO-) in organic solvent (DMSO) through intermolecular hydrogen bonding. Addition of anions to the receptor caused changes in UV–vis spectrum which provided the first indication of its anion binding ability. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.  相似文献   

9.
A series of benzyloxybenzaldehyde derivatives (1-4) were synthesized by the reactions of 4-(bromomethyl)benzonitrile with 4-hydroxy-3-methoxybenzaldehyde (vanillin), 2-hydroxy-3-methoxybenzaldehyde (o-vanillin), 2-hydroxy-4-methoxybenzaldehyde and 2-hydroxy-5-methoxybenzaldehyde. Condensation reactions among the new benzyloxybenzaldehyde derivatives (1-4) with 4′-aminobenzo-15-crown-5 yielded the new Schiff base compounds (5-8). Sodium complexes (5a-8a) and potassium complexes (5b-8b) were prepared with NaClO4 and KI, respectively. All of these synthesized compounds were characterized on the basis of FT-IR, 1H and 13C NMR, mass spectrometry and elemental analyses data. The solid state structures of compounds 8 and 5a were determined by X-ray crystallography. The extraction abilities of compounds 5-8 were also evaluated in CH2Cl2 by using several main group and transition metal picrates, such as Na+, K+, Pb2+, Cr3+, Ni2+, Cu2+ and Zn2+.  相似文献   

10.
A novel selective and sensitive colorimetric receptor 1 (1, 10-phenanthroline-2, 9-dialdehyde bis-(-p-nitrophenylureasemicarbo-hydrazone)) based on urea showing distinctive color fading phenomenon towards H2PO4? ion was reported. Fancifully, the recognition process of receptor 1 to H2PO4? was not interfered by the existence of others anions. We have probed the binding mechanism of 1-H2PO4? that H2PO4? ion induced competitive hydrogen binding process via intramolecular hydrogen-bond by UV–vis, fluorescence, 1H NMR titrations and ESI-MS experiments.  相似文献   

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