Authors:A. Petruczynik, K. Wróblewski, and M. Waksmundzka-Hajnos
associates. Good peak symmetry and system efficiency for analysis of basic compounds are also achieved by use of mobile phases containing organic amines as silanol blockers.
To suppress free silanol groups, an addition of ionicliquids (ILs) to mobile
Authors:Fahimeh Rasoolzadeh, Payman Hashemi, and Fariba Nazari Serenjeh
in aqueous solutions of non-ionic surfactants [ 22 ].
Recently, the use of room temperature ionicliquids (ILs) as alternatives to surfactants or organic solvents has been reported in CPE [ 23 ] methods. ILs are less toxic than organic
Authors:W. Guan, L. Li, H. Wang, J. Tong, and J. Yang
A brown and transparent ionic liquid (IL), [C4mim][FeCl4], was prepared by mixing anhydrous FeCl3 with 1-butyl-3-methylimidazolium chloride ([C4mim][Cl]), with molar ratio 1/1 under stirring in a glove box filled with dry argon. The molar enthalpies of solution, ΔsHm, of [C4mim][FeCl4], in water with various molalities were determined by a solution-reaction isoperibol calorimeter at 298.15 K. Considering
the hydrolyzation of anion [FeCl4]− in dissolution process of the IL, a new method of determining the standard molar enthalpy of solution, ΔsHm0, was put forward on the bases of Pitzer solution theory of mixed electrolytes. The values of ΔsHm0 and the sum of Pitzer parameters:
were obtained, respectively. In terms of thermodynamic cycle and the lattice energy of IL calculated by Glasser’s lattice
energy theory of ILs, the dissociation enthalpy of anion [FeCl4]−, ΔHdis≈5650 kJ mol−1, for the reaction: [FeCl4]−(g)→Fe3+(g)+4Cl−(g), was estimated. It is shown that large hydration enthalpies of ions have been compensated by large the dissociation enthalpy
of [FeCl4]− anion, ΔdHm, in dissolution process of the IL.
Transformed from heterogeneous to homogeneous state, an ionic liquid (IL)-based Suzuki coupling reaction was successfully implemented in a continuous microflow system. Triethylamine (Et3N) was introduced as the base, and N-methylpyrrolidinone (NMP) was used as the solvent of boronic acid, which brought about the first improvement on the reaction performance. Then, the implementation of this reaction in a continuous microflow system brought about further improvement on the reaction yield and selectivity due to better mixing condition. The combination of IL as the reaction medium and the continuous microflow system as the reactor in this work exhibited great potential for efficient Suzuki coupling reactions.
We investigated the features of the glass transition relaxation of two room temperature ionic liquids using DSC. An important
observation was that the heat capacity jump, that is the signature of the glass transition relaxation, shows a particularly
strong value in this type of new and promising materials, candidates for a range of applications. This suggests a high degree
of molecular mobility in the supercooled liquid state. The study of the influence of the heating rate on the temperature location
of the glass transition signal, allowed the determination of the activation energy at the glass transition temperature, and
the calculation of the fragility index of these two ionic glass-formers. It was concluded that this kind of materials belong
to the class of relatively strong glass-forming systems.
Ionicliquids have received considerable attention recently for their wide range of applications, which are invariably possible due to attractive physical and chemical properties of these materials [ 1 – 5 ]. These
Authors:Duyuan Yue, Yan Jing, Jun Ma, Ying Yao, and Yongzhong Jia
As green solvents, ionicliquids especially air and water stable ionicliquids have gained great attention [ 1 – 3 ]. In recent decades, the study of ionicliquids is focused on the chemical reaction and separation
Authors:Dan Liu, Jianzhou Gui, Jianfeng Ding, JuanJuan Ma, Juyoung Lee, and Zhaolin Sun
alternative solvents for separations, chemical synthesis, electrochemistry and catalysis. Generally, they are nonvolatile, non-explosive, recyclable, easy to handle and thermally robust. The work on deep desulfurization by ionicliquids was well summarized in
Authors:Carlos Andrade, Ricardo Matos, Viviane Oliveira, Jussara Durães, and Maria Sales
Ionicliquids (ILs) have a widespread use in many areas of chemistry due to features of first-rate chemical and thermal stabilities, good electronic and ionic conductivities and ability to dissolve a great variety
and 43% ee% for α-methylstyrene. It would be of interest if we could shorten the reaction time and improve the enantioselectivity of the asymmetric reaction without the use of volatile organic solvent.
Room temperature ionicliquids (RTILs) are