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ionic liquids

Minming Shen, Yuyang Zhang, Kaizhou Chen, Siying Che, Jia Yao, Haoran Li
The ionicity value, which is a key property of protic ionic liquids, was obtained by the attenuated total reflection Fourier transform infrared spectroscopy and nuclear magnetic resonance respectively for a protic ionic liquid: n-propylammonium acetate. The method of potentiometric titration is found not suitable for such kind of ionic liquid as the ∆pKa of the compositing acid and base is relatively small. In the IR spectrum, molecular species can be directly observed in the range 1200-1800 cm-1, and the ratio of ionic and molecular species can be quantitatively calculated by the area of characteristic absorption peaks calibrated by standard curve from NaAc/HAc solutions...
January 19, 2017: Journal of Physical Chemistry. B
P Goodrich, H Q Nimal Gunaratne, L Hall, Y Wang, L Jin, M J Muldoon, A P C Ribeiro, A J L Pombeiro, V I Pârvulescu, P Davey, C Hardacre
A bis-oxazoline ligand has been complexed using Cu(ii) and Zn(ii) trifluoromethanesulfonate and a range of chiral ionic liquid (CIL) additives based on natural products were used as a co-catalyst for a Diels-Alder reaction. The catalytic performance of these systems was compared for the asymmetric Diels-Alder reaction between N-acryloyloxazolidinone and cyclopentadiene with and without the presence of a CIL additive. In the absence of the CIL, both catalysts resulted in low enantioselectivities in conventional solvents and ionic liquids...
January 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Steven A Yamada, Heather E Bailey, Amr Tamimi, Chunya Li, Michael D Fayer
The dynamics of the room temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BmimNTf2) were investigated with two dimensional infrared (2D IR) vibrational echo spectroscopy and polarization selective pump-probe (PSPP) experiments. The CN stretch frequency of a modified Bmim+ cation (referred to hereafter as 2-SeCN-Bmim+), in which a SeCN moiety was substituted onto the C-2 position of the imidazolium ring, was used as a vibrational probe. A major result of the 2D IR experiments is the observation of a long timescale structural spectral diffusion component of 600 ps in addition to short and intermediate timescales similar to those measured for selenocyanate anion (SeCN‒) dissolved in BmimNTf2...
January 18, 2017: Journal of the American Chemical Society
Yonglei Wang, Mikhail Golets, Bin Li, Sten Sarman, Aatto Laaksonen
Atomistic molecular dynamics simulations have been performed to study microscopic interfacial ionic structures, molecular arrangements and orientational preferences of trihexyltetradecylphosphonium-bis(mandelato)borate ($[\textrm{P}_{6,6,6,14}]$[BMB]) ionic liquid confined between neutral and charged gold electrodes. It is found that both $[\textrm{P}_{6,6,6,14}]$ cations and [BMB] anions are coabsorbed onto neutral electrodes at different temperatures. The hexyl and tetradecyl chains in $[\textrm{P}_{6,6,6,14}]$ cations lie preferentially flat on neutral electrodes...
January 18, 2017: ACS Applied Materials & Interfaces
Heng Zhang, Chunmei Li, Michal Piszcz, Estibaliz Coya, Teofilo Rojo, Lide M Rodriguez-Martinez, Michel Armand, Zhibin Zhou
Electrochemical energy storage is one of the main societal challenges to humankind in this century. The performances of classical Li-ion batteries (LIBs) with non-aqueous liquid electrolytes have made great advances in the past two decades, but the intrinsic instability of liquid electrolytes results in safety issues, and the energy density of the state-of-the-art LIBs cannot satisfy the practical requirement. Therefore, rechargeable lithium metal batteries (LMBs) have been intensively investigated considering the high theoretical capacity of lithium metal and its low negative potential...
January 18, 2017: Chemical Society Reviews
Simona Rizzo, Serena Arnaboldi, Voichita Mihali, Roberto Cirilli, Alessandra Forni, Armando Gennaro, Abdirisak Ahmed Isse, Marco Pierini, Patrizia Romana Mussini, Francesco Sannicolò
To achieve enantioselective electroanalysis either chiral electrodes or chiral media are needed. High enantiodiscrimination properties can be granted by the "inherent chirality" strategy of developing molecular materials in which the stereogenic element responsible for chirality coincides with the molecular portion responsible for their specific properties, an approach recently yielding outstanding performances as electrode surfaces. Inherently chiral ionic liquids (ICILs) have now been prepared starting from atropisomeric 3,3'-bicollidine, synthesized from inexpensive reagents, resolved into antipodes without need of chiral HPLC and converted into long-chain dialkyl salts with melting points below room temperature...
January 18, 2017: Angewandte Chemie
Le Mi, Dandan Qin, Jie Cheng, Dan Wang, Sha Li, Xuetuan Wei
Two engineered Escherichia coli strains, DQ101 (MG1655 fadD (-))/pDQTES and DQ101 (MG1655 fadD (-))/pDQTESZ were constructed to investigate the free fatty acid production using ionic liquid-based acid- or enzyme-catalyzed bamboo hydrolysate as carbon source in this study. The plasmid, pDQTES, carrying an acyl-ACP thioesterase 'TesA of E. coli in pTrc99A was constructed firstly, and then (3R)-hydroxyacyl-ACP dehydratase was ligated after the TesA to give the plasmid pDQTESZ. These two strains exhibited efficient fatty acid production when glucose was used as the sole carbon source, with a final concentration of 2...
January 17, 2017: Journal of Industrial Microbiology & Biotechnology
Michael Angell, Chun-Jern Pan, Youmin Rong, Chunze Yuan, Meng-Chang Lin, Bing-Joe Hwang, Hongjie Dai
In recent years, impressive advances in harvesting renewable energy have led to a pressing demand for the complimentary energy storage technology. Here, a high Coulombic efficiency (∼99.7%) Al battery is developed using earth-abundant aluminum as the anode, graphite as the cathode, and a cheap ionic liquid analog electrolyte made from a mixture of AlCl3 and urea in a 1.3:1 molar ratio. The battery displays discharge voltage plateaus around 1.9 and 1.5 V (average discharge = 1.73 V) and yielded a specific cathode capacity of ∼73 mAh g(-1) at a current density of 100 mA g(-1) (∼1...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
Filippo Ferdeghini, Quentin Berrod, Jean-Marc Zanotti, Patrick Judeinstein, Victoria García Sakai, Orsolya Czakkel, Peter Fouquet, Doru Constantin
When probed at the macroscopic scale, Ionic Liquids (ILs) behave as highly dissociated (i.e. strong) electrolytes while, at the molecular scale, they show clear characteristics of weak ionic solutions. The multi-scale analysis we report in this paper reconciles these apparently at odds behaviors. We investigate by quasi-elastic neutron scattering (QENS) and neutron spin-echo (NSE), the nanometer/nanosecond dynamics of OMIM-BF4, an imidazolium-based IL showing strong nanostructuration. We also probe the same IL on the microscopic (μm and ms) scale by pulsed field gradient NMR...
January 17, 2017: Nanoscale
Marieke De Boeck, Sophie Missotten, Wim Dehaen, Jan Tytgat, Eva Cuypers
To date, thorough clean-up of complex biological samples remains an essential part of the analytical process. The solid phase extraction (SPE) technique is the well-known standard, however, its main weaknesses are the labor-intensive and time-consuming protocols. In this respect, dispersive liquid-liquid microextractions (DLLME) seem to offer less complex and more efficient extraction procedures. Furthermore, ionic liquids (ILs) - liquid salts - are emerging as new promising extraction solvents, thanks to their non-flammable nature, negligible vapor pressure and easily adaptable physiochemical properties...
December 26, 2016: Forensic Science International
Gourav Bhattacharya, Rajendra P Giri, Himani Saxena, Ved Varun Agrawal, Ashish Gupta, Mrinmay Kumar Mukhopadhyay, Sajal Kumar Ghosh
Ionic liquids (ILs) are important for their antimicrobial activity and are found to be toxic to some of the micro-organisms. To shed light on the mechanism of their activities, the interaction of an imidazolium-based IL 1-butyl-3-methylimidazolium tetrfluroborate ([BMIM][BF4]) with E-coli bacteria and cell membrane mimicking lipid mono- and bi-layers have been studied. The survival of the bacteria and corresponding growth inhibition are observed to be a function of concentration of the IL. The IL alters the pressure area isotherm of the monolayer formed at air-water interface by the lipid 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC)...
January 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Pengfa Xu, Wei Han, Philip M Rice, Jaewoo Jeong, Mahesh G Samant, Katayoon Mohseni, Holger L Meyerheim, Sergey Ostanin, Igor V Maznichenko, Ingrid Mertig, Eberhard K U Gross, Arthur Ernst, Stuart S P Parkin
A conducting 2D electron gas (2DEG) is formed at the interface between epitaxial LaFeO3 layers >3 unit cells thick and the surface of SrTiO3 single crystals. The 2DEG is exquisitely sensitive to cation intermixing and oxygen nonstoichiometry. It is shown that the latter thus allows the controllable formation of the 2DEG via ionic liquid gating, thereby forming a nonvolatile switch.
January 16, 2017: Advanced Materials
Yang Liu, Jinhua Yuan, Yuezhen Dong, Xiaopeng Zhao, Jianbo Yin
Recent research of using poly(ionic liquid) (PIL) particles as the dispersal phase has provided a new strategy to develop a high-performance anhydrous polyelectrolyte-based electrorheological (ER) fluid. However, the working temperature range of the ER fluid of PIL particles is still narrow due to an inherently low glass transfer temperature caused by the plasticization of polyatomic organic counter ions in PILs. In this paper, we develop a new ER system based on cross-linked PIL (C-PIL) particles and demonstrate that crosslinking with a suitable degree only slightly degrades the ER properties but significantly improves the working temperature range of the ER fluid of PIL particles...
January 16, 2017: Soft Matter
Julian Schaumann, Manuel Loor, Derya Ünal, Anja Mudring, Stefan Heimann, Ulrich Hagemann, Stephan Schulz, Franziska Maculewicz, Gabi Schierning
A systematic study on the microwave-assisted thermolysis of the single source precursor (Et2Sb)2Te (1) in different asymmetric 1-alkyl-3-methylimidazolium- and symmetric 1,3-dialkylimidazolium-based ionic liquids (ILs) reveals the distinctive role of both the anion and the cation in tuning the morphology and microstructure of the resulting Sb2Te3 nanoparticles as evidenced by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS)...
January 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Hongkun He, Khosrow Rahimi, Mingjiang Zhong, Ahmed Mourran, David R Luebke, Hunaid B Nulwala, Martin Möller, Krzysztof Matyjaszewski
Cubosomes are micro- and nanoparticles with a bicontinuous cubic two-phase structure, reported for the self-assembly of low molecular weight surfactants, for example, lipids, but rarely formed by polymers. These objects are characterized by a maximum continuous interface and high interface to volume ratio, which makes them promising candidates for efficient adsorbents and host-guest applications. Here we demonstrate self-assembly to nanoscale cuboidal particles with a bicontinuous cubic structure by amphiphilic poly(ionic liquid) diblock copolymers, poly(acrylic acid)-block-poly(4-vinylbenzyl)-3-butyl imidazolium bis(trifluoromethylsulfonyl)imide, in a mixture of tetrahydrofuran and water under optimized conditions...
January 16, 2017: Nature Communications
Junjun Peng, Nanqing Chen, Rui He, Zhiyong Wang, Sheng Dai, Xianbo Jin
Although, in the carbon family, graphite is the most thermodynamically stable allotrope, conversion of other carbon allotropes, even amorphous carbons, into graphite is extremely hard. We report a simple electrochemical route for the graphitization of amorphous carbons through cathodic polarization in molten CaCl2 at temperatures of about 1100 K, which generates porous graphite comprising petaloid nanoflakes. This nanostructured graphite allows fast and reversible intercalation/deintercalation of anions, promising a superior cathode material for batteries...
January 16, 2017: Angewandte Chemie
Walter B Wilson, Lane C Sander, Jorge O Oña-Ruales, Stephanie G Mössner, Leonard M Sidisky, Milton L Lee, Stephen A Wise
Retention indices for 10 sets of alkyl-substituted polycyclic aromatic sulfur heterocycles (PASHs) isomers (total of 80 PASHs) were determined using gas chromatography with three different stationary phases: a 50% phenyl phase, a 50% liquid crystalline dimethylpolysiloxane (LC-DMPS) phase, and an ionic liquid (IL) phase. Correlations between the retention behavior on the three stationary phases and PASH geometry [length-to-breadth (L/B) and thickness (T)] were investigated for the following PASHs: 4 methyl-substituted dibenzothiophenes (DBTs), 3 ethyl-substituted DBTs, 15 dimethyl-substituted DBTs, 8 trimethyl-substituted DBTs, 15 methyl-substituted naphthothiophenes, 30 methyl-substituted benzonaphthothiophenes, and 5 methyl-substituted tetrapheno[1,12-bcd]thiophene...
January 10, 2017: Journal of Chromatography. A
Walter B Wilson, Lane C Sander, Jorge O Oña-Ruales, Stephanie G Mössner, Leonard M Sidisky, Milton L Lee, Stephen A Wise
Retention indices for 48 polycyclic aromatic sulfur heterocycles (PASHs) were determined using gas chromatography with three different stationary phases: a 50% phenyl phase, a 50% liquid crystalline dimethylpolysiloxane (LC-DMPS) phase, and an ionic liquid (IL) phase. Correlations between the retention behavior on the three stationary phases and PASH geometry (L/B and T, i.e., length-to-breadth ratio and thickness, respectively) were investigated for the following four isomer sets: (1) 4 three-ring molecular mass (MM) 184Da PASHs, (2) 13 four-ring MM 234Da PASHs, (3) 10 five-ring MM 258Da PASHs, and (4) 20 five-ring MM 284Da PASHs...
January 10, 2017: Journal of Chromatography. A
David V McCalley
Trifluoracetic acid (TFA) added to the aqueous acetonitrile mobile phase induces some unexpected changes in the ionic component of retention in hydrophilic interaction separations when using Type B silica and amide-bonded silica columns. TFA use results in anion exchange properties which contrast with the cation exchange typically found with ammonium salt buffers. The significant cation exchange properties of silica hydride columns are also moderated by TFA. Similar behaviour was shown in a metal- free amide column operated on a system washed with a metal complexing agent, suggesting that adsorbed metal cations were not responsible for this anion exchange behaviour...
December 15, 2016: Journal of Chromatography. A
Xingping Dai, Dongsheng Wang, Hui Li, Yanyi Chen, Zhicheng Gong, Haiyan Xiang, Shuyun Shi, Xiaoqing Chen
Polar and hydrophilic properties of hydroxybenzoic acids usually made them coelute with interferences in high performance liquid chromatography (HPLC) analysis. Then selective analysis of them was necessary. Herein, hollow porous ionic liquids composite polymers (PILs) based solid phase extraction (SPE) was firstly fabricated and coupled online with HPLC for selective analysis of hydroxybenzoic acids from complex matrices. Hollow porous PILs were firstly synthesized using Mobil Composition of Matter No. 48 (MCM-48) spheres as sacrificial support, 1-vinyl-3-methylimidazolium chloride (VMIM(+)Cl(-)) as monomer, and ethylene glycol dimethacrylate (EGDMA) as cross-linker...
January 9, 2017: Journal of Chromatography. A
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