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  • 离子液体-性质、制备与应用
  • 更新时间:2014-04-11;信息类型:专著
  • 本书比较系统地介绍了离子液体的性质、制备和应用。全书共分7章,包括离子液体的定义和发展历史;分类和制备;物理化学和结构性质;离子液体在有机合成、 催化、分离分析和电化学领域中的应用等。本书涵盖了2005年10月以前国内外有关离子液体的最新研究成果,内容丰富翔实。 本书可供化学、化工、材料及相关学科领域从事研究开发、生产的科技与管理人员,以及高等院校师生阅读参考。
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-11/317.html
  • 一种光响应的离子液体及其制备方法
  • 更新时间:2014-04-11;信息类型:发明专利
  • 本发明公开了一种光响应的离子液体及其制备方法。离子液体的结构具有如下通式,该离子液体含有光响应的偶氮苯基团,在溶液和纯液态情况下均可保持良好的光 致变色(异构)性能,在光的作用下能实现离子液体的物理化学性质例如紫外可见吸收光谱、荧光发射光谱和电导率的可逆变化,可以作为一种优良的信息存储材 料、光开关分子器件、导电的光致变色(异构)材料和光敏感材料。
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-11/308.html
  • Benzonitrile as a Probe of Local Environment in Ionic Liquids
  • 更新时间:2014-04-10;信息类型:SCI论文
  • Because of its sensitivity to chemical and electrostatic characteristics, nitrile group as an infrared (IR) probe to monitor the local structure, folding kinetics, and electrostatic environment of protein, or solvation of molecular solvents, has attracted increasing attention. Herein, by choosing benzonitrile and imidazolium ionic liquids (ILs) as the IR probe and model ILs, respectively, we report that the nitrile stretching vibration (νCN) could be utilized as a simple and substantial IR probe to monitor the local environment of ILs such as hydrogen bonding (H-bonding) as well as intrinsic electric field. In 1-alkyl-3-methylimidazolium-based non-hydroxyl ILs, the νCN is in a “free” state, and is less affected by the alkyl chain, while it significantly decreases with the effective anion charge. In 1-(2-hydroxyethyl)-3-methylimidazolium-based hydroxyl ILs, however, a distinct anion-dependent νCN forming H-bonding with the hydroxyl is also observed besides the “free” νCN band. The “free” component of νCN can be further employed to determine the intrinsic electric field in both non-hydroxyl (directly) and hydroxyl (indirectly by subtracting H-bonding contribution) ILs by using vibrational Stark effect. Moreover, the result suggests that benzonitrile is preferentially located in the charge domain in ILs and it could be a more suitable probe to report the ionic network rather than the nonpolar domain in ILs.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/174.html
  • Distinct influence of the anion and ether group on the polarity of ammonium and imidazolium ionic liquids
  • 更新时间:2014-04-10;信息类型:SCI论文
  • The polarity of ionic liquids (ILs), usually denoted as ET(30) by the solvatochromic probe Reichardt’s dye, is one of the most fundamental properties that remarkably affect the solvation and chemical reaction in ILs. It was generally accepted that the ET(30) of ILs was dominated by the nature of the cation. However, in this work, it was found that the common ammonium-based ILs showed strongly anion-dependent ET(30). For example, the ET(30) value for [N1124][DCA] and [N1124][NTf2] is 49.0 and 59.0 kcal mol 1, respectively, while the corresponding imidazolium ILs bearing the same anions possess nearly identical ET(30), the ET(30) value for [BMIm][DCA] and [BMIm][NTf2] is 51.4 and 51.6 kcal mol 1, respectively. Moreover, introduction of an ether group was found to increase the ET(30) of imidazolium ILs while having no obvious effect on that of ammonium-based ILs. The Kamlet–Taft parameters and density functional theory (DFT) calculations indicated that the distinct result is related to different stabilization of the ground state of Reichardt’s dye 30. In imidazolium ILs, the main interactions between ILs and zwitterionic dye involve both coulombic interaction (between the cation and the phenolate oxygen atom) and H-bonding interaction (between the acidic hydrogen on imidazolium ring and the phenolate oxygen atom). However, with the ammonium ILs lack of active hydrogen, the dye is only stabilized by the coulombic interaction between the cation and the phenolate oxygen atom. Interestingly, in both imidazolium and ammonium-based ILs, the spiropyran–merocyanine equilibrium exhibit obvious anion-dependent photochromism, solvatochromism, and thermal relaxation.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/162.html
  • Dialkoxy functionalized quaternary ammonium ionic liquids as potential electrolytes and cellulose solvents
  • 更新时间:2014-04-10;信息类型:SCI论文
  • A series of new ionic liquids, based on dialkoxy-functionalized quaternary ammonium cations {side chains: 1 = CH3, 1O1 = CH3OCH2, 1O2 =CH3OC2H4, 2O2 = C2H5OC2H4; cations: [N11,1O1,1O2], [N11,1O1,2O2], [N11,1O2,1O2], [N11,1O2,2O2] and [N11,2O2,2O2]}, with BF4 , (CF3SO2)2N (NTf2) and CH3CO2  (OAc) as counteranions, have been prepared and characterized. Their basic properties, such as spectroscopic characteristics, melting point, glass transition temperature, thermal stability, electrochemical window, density, refractive index, viscosity and conductivity, were measured and comparatively studied. The incorporation of two flexible alkoxy chains makes the quaternary ammonium salts highly qualified to be low-viscous and high-conductive room temperature ILs, and even some of them have significantly better fluidity than the popular imidazolium ILs with a similar molecular weight, e.g. [N11,1O1,2O2]BF4 (151 cP and 2.11 mS cm1, Mw: 249) vs. [HMIm]BF4 (220 cP and 1.2 mS cm1, Mw: 256) at 25 ℃. The electrochemical windows of these ILs were evaluated up to 5.5 V. In addition, the dialkoxy OAc ILs were found to have excellent solvent power for cellulose under mild conditions, e.g. a solution of 18 wt% microcrystalline cellulose in [N11,2O2,2O2]OAc at 80 ℃. By precipitation with water, the dissolved cellulose (I crystal structure) was regenerated as nanosized cellulose II particles with increased surface area and decreased crystallinity, determined by FE-SEM and XRD.
  • 链接地址:http://www.ionicliquid.org/download/article/2014-04-10/143.html
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