5197-65-9Relevant academic research and scientific papers
Crown ether type ionic liquid based on imidazole, benzimidazole and their derivatives
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Paragraph 0072; 0073; 0074-0079, (2019/06/30)
The invention discloses a crown ether type ionic liquid based on imidazole, benzimidazole and their derivatives. Cations of the crown ether type ionic liquid are imidazole, benzimidazole and their derivatives; anions include neutral or alkaline mononuclear and multinuclear anions; the mononuclear anions include Cl-, Br-, BF4-, PF6-, CF3COO-, CF3SO2-, (CF3SO2)N- and OH-; the multinuclear anions include AlCl4-, FeCl3- CuCl3- and AuCl4-. In some reactions, the crown ether type ionic liquid has the advantages of high reaction rate, high conversion rate, high reaction selectivity, reusability of acatalytic system and the like. In addition, the crown ether type ionic liquid also has a potential application prospect in terms of solvent extraction, separation and purification of matters, recycling of waste macromolecular compounds, fuel cells and solar cells, extraction of industrial waste gas, dissolution of geological samples, separation and treatment of nuclear fuels and nuclear wastes andthe like.
Polyoxometalate-based Gemini ionic catalysts for selective oxidation of benzyl alcohol with hydrogen peroxide in water
Hao, Pengbo,Zhang, Mingjie,Zhang, Wei,Tang, Zhiyang,Luo, Ni,Tan, Rong,Yin, Donghong
, p. 4463 - 4473 (2018/09/11)
Keggin-type phosphotungstic acid (H3PW12O40, HPW)-based di-imidazolium ionic liquid (IL) hybrids were prepared by exchanging the protons of HPW with PEG-bridged di-imidazolium cations in water. Characterization results sug
Preparation and characterization of an improved Cu2+-cyclen polyurethane material that catalyzes generation of nitric oxide from S-nitrosothiols
Liu, Kun,Meyerhoff, Mark E.
supporting information, p. 18784 - 18787 (2012/10/30)
A new, stable and highly efficient Cu2+-cyclen-polyurethane material is described and shown to exhibit an improved performance compared to that of prior materials for the catalytic decomposition of S-nitrosothiols to physiologically active nitric oxide. The Royal Society of Chemistry.
Synthesis and radical polymerisation of methacrylic monomers with crown ethers or their dipodal counterparts in the pendant structure
Rey, Jimena,Garcia, Felix Clemente,Garcia, Jose Miguel
scheme or table, p. 948 - 957 (2012/03/27)
The synthesis and radical polymerisation of methacrylic monomers with benzo-12-crown-4, benzo-15-crown-5, benzo-18-crown-6, and their dipodal counterparts in the ester residue is described. The radical polymerisation of the monomers in solution was carried out at different temperatures, and the polymerisation kinetics curves were obtained by direct measurement of the instantaneous monomer concentrations by nuclear magnetic resonance spectroscopy (NMR). Thus, the polymerisation rate parameter (2fkp/〈k t〉1/2), along with the polymer stereoregularity, were obtained in terms of the molar fractions of meso and racemo diads and of syndiotactic, isotactic and heterotactic triads. The interaction of the polymers with cations was studied using polymer networks as solid phases in the solid-liquid extraction of lanthanide cations from both organic and aqueous media.
Ionic liquid-type crown ether as a novel medium for a liquid/liquid extraction of radioactive metal ion85Sr2+
Sang, Hyun Park,Dorjnamjin, Demberelnyamba,Seung, Ho Jang,Myung, Woo Byun
, p. 1024 - 1025 (2007/10/03)
1,13-Dichloro-4,7,10-trioxatridecane (2-[2-(1-chloro-2-ethoxy)ethoxy]ethyl chloride) (3a) was synthesized by a chlorination of 1,13-dihydroxy-4,7,10- trioxatridecane (triethylene glycol). And it was treated with imidazole and sodium ethoxide to give the 1N,1N′(oxoethylene)-diimidazole (3b), which was then converted to ionic liquid-type crown ether (ILCE) 3 with a reaction with 1,9-dichloro-3,6-trioxaoctane (2a). Further, the anion of ILCE was exchanged by an anion-exchange method. Ultimately, we developed a very efficient synthetic pathway for ILCEs 1-4 which have various physical and chemical characteristics by a modification of the polyethylene glycol chain length and anions. 85Sr2+ was successfully extracted into the [(3,2)OEtIm][Cl] (3) phase, but it was not extracted into the [(2,2)OEtIm][Cl] (1), [(3,3)OEtIm][Cl] (2), and [(4,3)OEtIm][Cl] (4) phases. Copyright
Crown-annelated oligothiophenes as model compounds for molecular actuation
Jousselme, Bruno,Blanchard, Philippe,Levillain, Eric,Delaunay, Jacques,Allain, Magali,Richomme, Pascal,Rondeau, David,Gallego-Planas, Nuria,Roncali, Jean
, p. 1363 - 1370 (2007/10/03)
Crown-annelated quater- (4T) and sexithiophenes (6T) with oligooxyethylene chains of various lengths attached at the 3-positions of the terminal thiophene rings have been synthesized. Analysis of the cation-binding properties of the macrocycles by 1H NMR and UV-vis spectroscopy reveals the formation of a 1:1 complex with Ba2+, Sr2+, or Pb2+ and shows that cation complexation results in a conformational transition in the π-conjugated system. Theoretical analysis of this process by density functional methods predicts that this conformational transition results in a narrowing of the highest occupied-lowest unoccupied molecular orbital gap of the conjugated system with a decrease of the redox potentials (E01 and E02) associated with the formation of the 4T cation radical and dication. Cyclic voltammetry shows that, depending on the binding constant, the presence of metal cation produces a negative or a positive shift of E01 while E02 always shifts negatively. This unusual behavior is discussed in terms of interplay between electrostatic interactions and conformational changes associated with cation binding.
Synthesis and metal-binding properties of novel "fullerenocrowns"
Ikeda, Atsushi,Fukuhara, Chie,Shinkai, Seiji
, p. 407 - 408 (2007/10/03)
"Fullerenocrowns" in which C60 carbons are directly included as a ring member in the crown ring were synthesized for the first time; the UV-Vis absorption spectra were sensitively changed by the addition of metal and ammonium cations.
Ion selective fluorogenic reagents
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, (2008/06/13)
Novel fluorogenic ionophores have been synthesized which selectively bind ions such as potassium and sodium, even in neutral aqueous and alcoholic media and respond to such binding by fluorescence quenching or enhancement. These ionophores are ideal for the selective and direct determination of ions in biological or environmental samples and the like. The ionophores are also suitable for incorporation into fiber optic-based sensors for the continuous in vivo or in vitro monitoring of metal ions in blood or other biological fluids.
Chiral Biphenyl Bis(crown ethers): Synthesis and Resolution
Lindsten, Goeran,Wennerstroem, Olof,Isaksson, Roland
, p. 547 - 554 (2007/10/02)
New chiral bis(crown ethers) with a central 2,2',6,6'-tetraoxybiphenyl unit have been prepared and resolved.Their complexing properties and absolute configuration are discussed.
