Proton-Conductive Magnetic Metal–Organic Frameworks, {NR<sub>3</sub>(CH<sub>2</sub>COOH)}[M<sub>a</sub><sup>II</sup>M<sub>b</sub><sup>III</sup>(ox)<sub>3</sub>]: Effect of Carboxyl Residue upon Proton Conduction
Bu-FeFe (R-FeFe MOFs) belong to the class II of mixed-valence compounds and show the magnetism characteristic of Néel N-type ferrimagnets. The Et-MOFs (Et-MnCr·2H(2)O, Et-FeCr·2H(2)O and Et-FeFe·2H(2)O) show high proton conduction, whereas the Bu-MOFs (Bu-MnCr, Bu-FeCr, and Bu-FeFe) show moderate proton conduction. Together with water adsorption isotherm studies, the significance of the carboxyl residues
Tetrahalogenoaurate anions have been successfully removed from water using betaine derivative cationic ionic liquids, by precipitation using hydrophilic ionic liquids or by liquid–liquid extraction with hydrophobic ionic liquids.
Synthesis and characterization of analogues of glycine-betaine surface-active ionic liquids
作者:Inês S. Cardoso、Emanuelle L.P. de Faria、Armando J.D. Silvestre、Mara G. Freire、Aminou Mohamadou
DOI:10.1016/j.molliq.2021.117440
日期:2021.11
imidazolium-based, which may raise some environmental and health-related concerns. Aiming the development of ILs with surfactant properties and low ecotoxicity, in this work, novel surface-active analogues of glycine-betaine ILs (AGB-SAILs) combined with the dodecylbenzenesulfonate ([DBS]-) anion have been synthesized and characterized. The synthesized AGB-SAILs were characterized chemically by elemental
为了寻找可持续溶剂,具有低生态毒性特征的新型离子液体 (IL) 已成为研究的目标。其中,具有表面活性特性的离子液体在食品、化妆品、制药、家庭清洁和其他洗涤剂行业中发挥着重要作用。迄今为止报道的大多数表面活性 IL 都是基于咪唑的,这可能会引起一些与环境和健康相关的问题。为了开发具有表面活性剂特性和低生态毒性的 ILs,在这项工作中,甘氨酸-甜菜碱 ILs 的新型表面活性类似物 (AGB-SAILs) 与十二烷基苯磺酸盐 ([DBS] -) 阴离子已被合成和表征。通过元素分析和光谱方法对合成的 AGB-SAIL 进行化学表征。测定了它们的热特性、临界胶束浓度、胶束直径和对费氏弧菌的生态毒性,并将这些特性与商业表面活性剂十二烷基苯磺酸钠 (SDBS) 进行比较。结果表明,所有研究的 AGB-SAIL 在室温下都是液体并且热稳定。此外,它们中的大多数显示出比 SDBS更低的临界胶束浓度和对费氏弧
Structural effect of synthetic zwitterionic cosolutes on the stability of DNA duplexes
作者:Kazuya Koumoto、Hirofumi Ochiai、Naoki Sugimoto
DOI:10.1016/j.tet.2007.10.060
日期:2008.1
The molecular design of useful cosolutes for polymerase chain reaction (PCR), which is one of the most important techniques in molecular biology, plays a significant role in amplification of highly stable genome sequences because during PCR, strand dissociation sometimes fails due to high melting temperature. Here, we designed and synthesized eight new zwitterionic cosolutes derived from glycine betaine, a destabilizing reagent for GC-rich DNA duplexes, and systematically compared their ability to destabilize DNA duplexes and to amplify genome DNA by PCR. We found that introduction of n-butyl groups rather than methyl groups into the ammonium group reduced the melting temperature of DNA duplexes 11-fold more than what was observed for the scaffold cosolute, glycine betaine, and furthermore, the cosolute can amplify the stable genome sequence by PCR. (c) 2007 Elsevier Ltd. All rights reserved.
Syntheses and characterisation of hydrophobic ionic liquids containing trialkyl(2-ethoxy-2-oxoethyl)ammonium or N-(1-methylpyrrolidyl-2-ethoxy-2-oxoethyl)ammonium cations
A series of salts based on ethyl ester betaine derivatives [trialkyl(2-ethoxy-2-oxoethyl)ammonium or N-(1-methylpyrrolidyl-2-ethoxy-2-oxoethyl)ammonium cations] with alkyl chains [ethyl, n-propyl and n-butyl] have been synthesized. These cations generate hydrophobic ionic liquids with bis(trifluoromethylsulfonyl)imide, tetrafluoroborate or dicyanamide anions. The influence of the alkyl chain length and the chemical nature of the counteranion on physicochemical properties such as density, melting point, glass transition and decomposition temperatures, viscosity, and electrochemical window have been investigated. (C) 2013 Elsevier B.V. All rights reserved.