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ionic liquids

Pratibha Dwivedi, Mangat Singh, Naina Sehra, Nishant Pandey, Rajender S Sangwan, Bhuwan B Mishra
In citrus processing industries, where up to 60% of the whole fruit is discarded, generates citrus waste (peel, seeds, membrane, and pulp) on a massive scale. The waste does not currently have high-value applications, instead the majority is disposed of or pelletized for animal feed. Therefore, a concise and efficacious protocol for processing of Kinnow mandarin (Citrus reticulata) fruit waste to numerous novel Brønsted acidic ionic liquids (3a-k) have been developed. BAILs were characterized using spectroscopic techniques (FT-IR and NMR)...
December 2, 2017: Bioresource Technology
Nir Gavish, Doron Elad, Arik Yochelis
The increasing number of experimental observations on highly concentrated electrolytes and ionic liquids show qualitative features that are distinct from dilute or moderately concentrated electrolytes, such as self-assembly, multiple-time relaxation, and under-screening, which all impact the emergence of fluid/solid interfaces, and transport in these systems. Since these phenomena are not captured by existing mean field models of electrolytes, there is a paramount need for a continuum framework for highly concentrated electrolytes and ionic liquids...
December 8, 2017: Journal of Physical Chemistry Letters
Kunze Du, Jin Li, Fei Tian, Yan-Xu Chang
A simple nonionic detergent - based vortex- synchronized matrix solid-phase dispersion (ND-VSMSPD) method was developed to extract bioactive compounds in Forsythiae Fructus coupled with ultra high-performance liquid chromatography (UHPLC). Nonionic detergent Triton 114 was firstly used as a green elution reagent in vortex- synchronized MSPD procedure. The optimum parameters were investigated to attain the best results, including Florisil as sorbent, 2mL 10% (v/v) nonionic detergent Triton X-114 as the elution reagent, 1:1 of sample/sorbent ratio, grinding for 3min, and whirling for 2min...
December 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
Fahime Rahmani, Iraj Mohammadpoor-Baltork, Ahmad Reza Khosropour, Majid Moghadam, Shahram Tangestaninejad, Valiollah Mirkhani
In this article, we report an efficient synthesis of 1,3-dimethyl-5-aryl-7-(pyridine-3(2)(4)-yl)pyrimidine-2,4(1H,3H)-diones via a three-component reaction of aryl aldehydes, 1,3-dimethyl-6-aminouracil and carbonitriles in the presences of triazine diphosphonium hydrogen sulfate ionic liquid supported on functionalized nano-silica (APTADPHS-nSiO2) as a reusable catalyst under microwave irradiation and solvent-free conditions. The bis-derivatives of pyridine-pyrimidines were also efficiently prepared from dialdehydes and dinitriles...
December 7, 2017: ACS Combinatorial Science
Fedor A Kucherov, Ksenia S Egorova, Alexandra V Posvyatenko, Dmitry B Eremin, Valentine P Ananikov
A novel mitoxantrone conjugate was synthesized by coupling mitoxantrone with ionic liquid tags, and cytotoxic behavior of the designed conjugate was studied in normal and cancer cell lines. The synthesized mitoxantrone conjugate was oil at physiological temperatures and demonstrated high aqueous solubility. Sensitivity of electrospray ionization mass spectrometry (ESI-MS) to the mitoxantrone conjugate was improved by an order of magnitude, in comparison with original mitoxantrone dihydrochloride. The observed ESI-MS signals were shifted to a "clearer" lower-mass region of the spectrum, which allowed investigation of the drug at the level of individual cells...
December 7, 2017: Analytical Chemistry
Mohsen Talebi, Rahul A Patil, Leonard M Sidisky, Alain Berthod, Daniel W Armstrong
Twelve bis- or dicationic ionic liquids (ILs) including eight based on imidazolium, a single one based on phosphonium, and three based on pyrrolidinium cationic units were prepared with the bis(trifluoromethyl sulfonyl) imide anion. The two identical cationic moieties were attached by different alkyl spacers having three or five carbons and differing alkyl substituents attached to the spacer. The SLB-IL111 column, as the most polar commercial stationary phase known, was included in the study for comparison...
December 6, 2017: Analytical and Bioanalytical Chemistry
Kui Xu, Zifeng Lin, Céline Merlet, Pierre-Louis Taberna, Ling Miao, Jianjun Jiang, Patrice Simon
We present a molecular dynamics simulation study achieved on two-dimensional (2D) Ti3C2Tx MXenes in an [EMIM]+[TFSI]- ionic liquid electrolyte. Our simulations reproduce the different patterns of volumetric change observed experimentally for both the negative and positive electrodes. The analysis of ionic fluxes and structure rearrangements in the 2D material provide an atomic scale insight into the charge and discharge processes in the layer pore and confirm the existence of two different charge storage mechanisms at the negative and positive electrodes...
December 6, 2017: ChemSusChem
Majid Moosavi, Fatemeh Khashei, Elaheh Sedghamiz
In this work, the structural and dynamical properties of two imidazolium-based geminal dicationic ionic liquids (GDILs), i.e. [Cn(mim)2][NTf2]2 with n = 3 and 5, have been studied to obtain a fundamental understanding of the molecular basis of the macroscopic and microscopic properties of the bulk liquid phase. To achieve this purpose, molecular dynamics (MD) simulation, density functional theory (DFT) and atoms in molecule (AIM) methods were used. Interaction energies, charge transfers and hydrogen bonds between the cation and anions of each studied GDIL were investigated by DFT calculations and also AIM...
December 6, 2017: Physical Chemistry Chemical Physics: PCCP
Juan Qin Xue, Ni Na Liu, Guo Ping Li, Long Tao Dang
This work evaluated the performance of ionic liquids (ILs) in supported liquid membranes in the removal of total cyanide from wastewater. Membranes were characterized by scanning electron microscopy and contact angle measurements to study the membrane morphology and wetting ability. In particular, the effects of operational parameters such as membrane immersion time, feed-phase concentration, and pH on cyanide removal were investigated. ILs are organic salts that are entirely composed of organic cations and either organic or inorganic anions...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Chad S Cummings, Allie C Obermeyer
Membraneless organelles, like membrane-bound organelles, are essential to cell homeostasis and provide discrete cellular sub-compartments. Unlike classical organelles, membraneless organelles possess no physical barrier, but rather arise by phase separation of the organelle components from the surrounding cytoplasm or nucleoplasm. Complex coacervation, the liquid-liquid phase separation of oppositely charged polyelectrolytes, is one of several phenomena that is hypothesized to drive the formation and regulation of some membraneless organelles...
December 6, 2017: Biochemistry
Li Wang, Siyuan Chen, Yiming Ding, Qiang Zhu, Nijia Zhang, Shuqing Yu
The present work determines the anticancer activity of bio-mediated synthesized cadmium sulfide nanoparticles using the ionic liquid and bacterial cells (Shewanella oneidensis). Bacterial cells have been exposed to be important resources that hold huge potential as ecofriendly, cost-effective, evading toxic of dangerous chemicals and the alternative of conventional physiochemical synthesis. The Shewanella oneidensis is an important kind of metal reducing bacterium, known as its special anaerobic respiratory and sulfate reducing capacity...
November 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
Yongqiang Liu, Yajie Ma, Hong Yu, Ying An
This article describes a pioneering ion-pair chromatography with indirect ultraviolet detection with imidazolium ionic liquids (ILs) as ultraviolet absorption reagent and eluting agent for determination of pyrrolidinium cations. Three pyrrolidinium cations were analyzed on a reversed-phase silica-based monolithic column by isocratic elution with imidazolium ILs-ion-pair reagents-methanol mixtures. The effects of the ultraviolet absorption reagents, detection wavelength, ion-pair reagents, imidazolium ILs, organic solvents, column temperature and flow rate on the separation and determination of pyrrolidinium cations were investigated...
December 1, 2017: Journal of Chromatographic Science
Vijay Beniwal, Anil Kumar
To carry out a chemical reaction between the reactants with largely different polarities it becomes important to have a reaction medium which possesses both the polar and non-polar solvation environments. In an attempt to explore the reaction media with such unique polarity properties, the present study provides a thorough understanding of the bipolar solvent media using the aqueous mixtures of amino-acid anion based ionic liquids. Highly polar behaviour of the binary mixtures used in the study has been ascribed to the pure ionic liquid state...
December 5, 2017: Journal of Physical Chemistry. B
Jian Pan, Houpu Li, Hao Sun, Ye Zhang, Lie Wang, Meng Liao, Xuemei Sun, Huisheng Peng
Driven by the increasing requirements for energy supply in both modern life and the automobile industry, the lithium-air battery serves as a promising candidate due to its high energy density. However, organic solvents in electrolytes are likely to rapidly vaporize and form flammable gases under increasing temperatures. In this case, serious safety problems may occur and cause great harm to people. Therefore, a kind of lithium-air that can work stably under high temperature is desirable. Herein, through the use of an ionic liquid and aligned carbon nanotubes, and a fiber shaped design, a new type of lithium-air battery that can effectively work at high temperatures up to 140 °C is developed...
December 4, 2017: Small
Mehmet Isik, Luca Porcarelli, Nerea Lago, Haijin Zhu, Maria Forsyth, David Mecerreyes
Proton conducting polymeric membranes are highly searched in many different technologies ranging from energy to biosensing. Protic ionic liquids and their polymeric version represent a new family of proton conducting molecules with relatively facile synthesis and excellent properties. In this work, protic poly(ionic liquids) having the most popular phosphonium counter-cations are presented for the first time. The synthesis is carried out through proton transfer reactions or through ion exchange reactions by using commercially available tertiary phosphines...
December 4, 2017: Macromolecular Rapid Communications
Yutong Lin, Ling Zhang, Ke Guo, Miao Wang, Ying Wei
Ionothermal synthesis of extra-large pore aluminophosphate zeotype with -CLO topological structure, DNL-1, was studied using 1,6-hexanediamine and several quaternary ammonium compounds with different types of cations and anions as co-structure-directing agent (co-SDA). Phase selectivity and crystallization process were comparatively investigated, showing that the crystallization of -CLO structure as well as LTA structure was correlated with the alkalinity and concentration rather than structure of co-SDA. Combining solid/solution 13C NMR and other characterizations on DNL-1 obtained with different co-SDAs, it was demonstrated that ionic liquid cation was unalterably occluded in the structure, while the occlusion of co-SDA cation was not imperative...
December 3, 2017: Chemistry: a European Journal
S Calabuig-Hernández, E Peris-García, M C García-Alvarez-Coque, M J Ruiz-Angel
The reversed-phase chromatographic behaviour of six tricyclic antidepressants (amitryptiline, clomipramine, doxepin, imipramine, nortryptiline and maprotiline) was examined in this work with acetonitrile-water mobile phases, in the absence and presence of the ionic liquids 1-hexyl-3-methylimidazolium chloride and 1-hexyl-3-methylimidazolium tetrafluoroborate, which have interesting features for the separation of basic compounds, in terms of peak shape combined with reduced retention. Tricyclic antidepressants are low polarity drugs that strongly associate to the alkyl chains of conventional stationary phases...
November 27, 2017: Journal of Chromatography. A
Utkarsh Kapoor, Jindal K Shah
Segregation of polar and nonpolar domains in ionic liquids for which either the cation or anion is responsible for inducing nonpolar domains is well understood. On the other hand, information regarding the nanoscale heterogeneities originating due to the presence of nonpolar content on both the ions is rudimentary at this point. The present contribution is aimed at addressing this question and focuses on a molecular dynamics simulation study to probe nanoscale structural and aggregation features of the 1-n-alkyl-3-methylimidazolium [Cnmim] octylsulfate C8SO4] ionic liquid homologous series (n = 2, 4, 6, 8, 10, and 12)...
December 4, 2017: Journal of Physical Chemistry. B
Pieter Geysens, Vijay Shankar Rangasamy, Savitha Thayumanasundaram, Koen Robeyns, Luc Van Meervelt, Jean-Pierre Locquet, Jan Fransaer, Koen Binnemans
Electrolytes consisting of sodium bis(fluorosulfonyl)imide (NaFSI) dissolved in glymes (monoglyme, diglyme and triglyme) were characterized by FT-Raman spectroscopy and 13C, 17O and 23Na NMR spectroscopy. The glyme:NaFSI molar ratio was varied from 50:1 to 1:1 and it was observed that in the dilute electrolytes, the sodium salt is completely dissociated into solvent separated ion pairs (SSIPs). However, contact ion pairs (CIPs) and aggregates (AGGs) become the predominant species in more concentrated solutions...
December 4, 2017: Journal of Physical Chemistry. B
Wudi Cao, Yanting Wang, Giacomo Saielli
We simulate the heating process of ionic liquids [CnMim][NO3] (n = 4, 6, 8, 10, 12), abbreviated as Cn, by means of molecular dynamics (MD) simulation starting from a manually constructed triclinic crystal structure composed of polar layers containing anions and cationic head groups and nonpolar regions in between containing cationic alkyl side chains. During the heating process starting from 200 K, each system undergoes first a solid-solid phase transition at a lower temperature, and then a melting phase transition at a higher temperature to an isotropic liquid state (C4, C6 and C8) or to a liquid crystal state (C10 and C12)...
December 4, 2017: Journal of Physical Chemistry. B
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