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https://www.readbyqxmd.com/read/28453309/combination-of-cyclodextrin-and-ionic-liquid-in-analytical-chemistry-current-and-future-perspectives
#1
Y H Boon, M Raoov, N N M Zain, S Mohamad, H Osman
The growth in driving force and popularity of cyclodextrin (CDs) and ionic liquids (ILs) as promising materials in the field of analytical chemistry has resulted in an exponentially increase of their exploitation and production in analytical chemistry field. Cyclodextrins belong to the family of cyclic oligosaccharides composing of α-(1,4) linked glucopyranose subunits and possess a cage-like supramolecular structure. This structure enables chemical reactions to proceed between interacting ions, radical or molecules in the absence of covalent bonds...
April 28, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28453283/ionic-liquid-mediated-hydrofluorination-of-o-azaxylylenes-derived-from-3-bromooxindoles
#2
Satoshi Mizuta, Hiroki Otaki, Ayako Kitagawa, Kanami Kitamura, Yuki Morii, Jun Ishihara, Kodai Nishi, Ryo Hashimoto, Toshiya Usui, Kenya Chiba
The hydrofluorination reaction of 3-bromooxindole using mild HF reagents in an ionic liquid is described. This transformation can operate at room temperature to give a series of 3-substituted 3-fluorooxindole derivatives including racemic BMS 204352 (MaxiPost). The mechanistic study about interactions between HF and 3-butyl-1-methylimidazolium tetrafluoroborate [bmim][BF4] is also discussed on the basis of energy calculations.
April 28, 2017: Organic Letters
https://www.readbyqxmd.com/read/28453260/origin-of-outstanding-phase-and-moisture-stability-in-na3p1-xasxs4-superionic-conductor
#3
Shun-Li Shang, Zhaoxin Yu, Yi Wang, Donghai Wang, Zi-Kui Liu
Sodium-ion (Na) solid-state electrolytes (SSEs) are critical to address notorious safety issue associated with liquid electrolytes used in the current Na-ion batteries. Fulfilling multiple innovations is a grand challenge but imperative for advanced Na-ion SSE such as a combination of high ionic conductivity and excellent chemical stability. Here, our first-principles and phonon calculations reveal that Na3P1-xAsxS4 (0 ≤ x ≤ 1) is a solid-state superionic conductor stabilized at 0 K by zero-point vibrational energy and at finite temperatures by vibrational and configurational entropies...
April 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28448150/electrostatic-screening-of-charged-defects-in-monolayer-mos2
#4
T L Atallah, J Wang, M Bosch, D Seo, R A Burke, O Moneer, Justin Zhu, M Theibault, L E Brus, J Hone, X-Y Zhu
Defects in monolayer transition-metal dichalcogenides (TMDCs) may lead to unintentional doping, charge-carrier trapping, and nonradiative recombination. These effects impair electronic and optoelectronic technologies. Here we show that charged defects in MoS2 monolayers can be effectively screened when they are in contact with an ionic liquid (IL), leading to an increase in photoluminescence (PL) yield by up to two orders of magnitude. The extent of this PL enhancement by the IL correlates with the brightness of each pretreated sample...
April 28, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28448122/iodine-pseudohalogen-ionic-liquid-based-electrolytes-for-quasi-solid-state-dye-sensitized-solar-cells
#5
Annkatrin Lennert, Michelle Sternberg, Karsten Meyer, Rubén D Costa, Dirk M Guldi
In the current work, novel symmetrically alkyl-substituted imidazolium-based ionic liquids have been synthesized featuring either iodide (I(-)) or selenocyanate (SeCN(-)) as counteranions. Physicochemical assays based on spectroscopy and electrochemistry techniques have been performed to identify the best ionic liquid for application as electrolytes in quasi-solid-state dye-sensitized solar cells (qssDSSC). The latter were mixed with additives such as 4-tert-butylpyridine (4tbpy) and guanidinium thiocyanate (GuSCN) to optimize electrode surface coverage, ionic diffusion, and dye regeneration...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447665/creation-of-energetic-biothermite-inks-using-ferritin-liquid-protein
#6
Joseph M Slocik, Ruel McKenzie, Patrick B Dennis, Rajesh R Naik
Energetic liquids function mainly as fuels due to low energy densities and slow combustion kinetics. Consequently, these properties can be significantly increased through the addition of metal nanomaterials such as aluminium. Unfortunately, nanoparticle additives are restricted to low mass fractions in liquids because of increased viscosities and severe particle agglomeration. Nanoscale protein ionic liquids represent multifunctional solvent systems that are well suited to overcoming low mass fractions of nanoparticles, producing stable nanoparticle dispersions and simultaneously offering a source of oxidizing agents for combustion of reactive nanomaterials...
April 27, 2017: Nature Communications
https://www.readbyqxmd.com/read/28447285/hydrogen-sulfide-and-ionic-liquids-absorption-separation-and-oxidation
#7
REVIEW
Cinzia Chiappe, Christian Silvio Pomelli
Economical and environmental concerns are the main motivations for development of energy-efficient processes and new eco-friendly materials for the capture of greenhouse gases. Currently, H2S capture is dominated by physical and/or chemical absorption technologies, which are, however, energy intensive and often problematic from an environmental point of view due to emission of volatile solvent components. Ionic liquids have been proposed as a promising alternative to conventional solvents because of their low volatility and other interesting properties...
June 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28447082/temperature-dependency-of-aqueous-biphasic-systems-an-alternative-approach-for-exploring-the-differences-between-coulombic-dominated-salts-and-ionic-liquids
#8
Francisca A E Silva, Jorge F B Pereira, Kiki A Kurnia, Sónia P M Ventura, Artur M S Silva, Robin D Rogers, João A P Coutinho, Mara G Freire
Herein we propose an alternative way to distinguish ionic liquids from Coulombic-dominated salts, based not on their upper limit melting temperature (100 °C), but on the trend of their phase-forming abilities to create aqueous biphasic systems as a function of temperature, in which a wider plethora of interactions can be appraised.
April 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28446335/quantitative-nano-characterization-of-polymers-using-atomic-force-microscopy
#9
Milad Radiom, Svilen Kozhuharov, Phally Kong, Michela di Giannantonio, Mathieu A Ayer, Plinio Maroni, Andreas F M Kilbinger, Katharina M Fromm, Christoph Weder, Michal Borkovec
The present article offers an overview on the use of atomic force microscopy (AFM) to characterize the nanomechanical properties of polymers. AFM imaging reveals the conformations of polymer molecules at solid- liquid interfaces. In particular, for polyelectrolytes, the effect of ionic strength on the conformations of molecules can be studied. Examination of force versus extension profiles obtained using AFM-based single molecule force spectroscopy gives information on the entropic and enthalpic elasticities in pN to nN force range...
April 26, 2017: Chimia
https://www.readbyqxmd.com/read/28445763/myosin-rod-hypophosphorylation-and-cb-kinetics-in-papillary-muscles-from-a-tnc-a8v-ki-mouse-model
#10
Masataka Kawai, Jamie R Johnston, Tarek Karam, Li Wang, Rakesh K Singh, Jose R Pinto
The cardiac troponin C (TnC)-A8V mutation is associated with hypertrophic and restrictive cardiomyopathy (HCM and RCM) in human and mice. The residue affected lies in the N-helix, a region known to affect Ca(2+)-binding affinity to the N-terminal domain. Here we report on the functional effects of this mutation in skinned papillary muscle fibers from homozygous knock-in TnC-A8V mice. Muscle fibers from left ventricle were activated at 25°C under the ionic conditions of working cardiomyocytes. The pCa-tension relationship showed a 3× increase in Ca(2+)-sensitivity and a decrease (0...
April 25, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28445028/enhanced-electrocatalytic-activity-of-ethanol-oxidation-reaction-on-palladium-silver-nanoparticles-via-removable-surface-ligands
#11
Hucheng Zhang, Yingying Shang, Jing Zhao, Jianji Wang
This work developed a facile colloidal route to synthesize BH4--capped PdxAgy nanoparticles (NPs) in water using the reducing ionic liquids of [Cnmim]BH4, and the resulting NPs were prone to form the nanocomposites with [amim]+-modified reduced graphene (RG). The removal of the metal-free inorganic ions of BH4- can create the profoundly exposed interfaces on the PdxAgy NPs during the electrooxidation, and favor the ethanol oxidation reaction (EOR) in lowering energy barrier. The counterions of [Cnmim]+ can gather ethanol, OH- ions, and the reaction intermediates on catalysts, and synergistically interact with RG to facilitate the charge transfer in nanocomposites...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28444986/supported-ionic-liquids-a-versatile-and-useful-class-of-materials
#12
REVIEW
Vincenzo Campisciano, Francesco Giacalone, Michelangelo Gruttadauria
Supported ionic liquids (SILs) represent a class of materials with peculiar properties and a huge potential regarding their possible applications in different fields of chemistry. Herein, we report our ongoing research about the use of SILs as support for organocatalysts, their role as catalysts themselves, and their application as support and stabilizers of palladium nanoparticles (PdNPs). The use of SILs based materials allowed achieving good results. Moreover, in some cases, after the functionalization of the catalytic species with an ion-tag moiety, a release and catch approach was employed in order to improve the catalytic activity and to facilitate the recovery of the hybrid system formed by the catalyst adsorbed onto SILs materials...
April 26, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28444982/ionic-liquid-based-ultrasound-assisted-extraction-of-isoflavones-from-belamcanda-chinensis-and-subsequent-screening-and-isolation-of-potential-%C3%AE-glucosidase-inhibitors-by-ultrafiltration-and-semi-preparative-high-performance-liquid-chromatography
#13
Senlin Li, Sainan Li, Yu Huang, Chunming Liu, Lina Chen, Yuchi Zhang
The separation of a compound of interest from its structurally similar homologues to produce high-purity natural products is a challenging problem. This work proposes a novel method for the separation of iristectorigenin A from its structurally similar homologues by ionic liquid-based ultrasound-assisted extraction and the subsequent screening and isolation of potential α-glucosidase inhibitors via ultrafiltration and semi-preparative high-performance liquid chromatography. Ionic-liquid-based ultrasound-assisted extraction was successfully applied to the extraction of tectorigenin, iristectorigenin A, irigenin, and irisflorentin from Belamcanda chinensis...
April 26, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28444925/highly-efficient-carbon-monoxide-capture-by-carbanion-functionalized-ionic-liquids-through-c-site-interactions
#14
Duan-Jian Tao, Feng-Feng Chen, Zi-Qi Tian, Kuan Huang, Shannon M Mahurin, De-En Jiang, Sheng Dai
A novel method for the highly efficient and reversible capture of CO in carbanion-functionalized ionic liquids (ILs) by a C-site interaction is reported. Because of its supernucleophilicity, the carbanion in ILs could absorb CO efficiently. As a result, a relatively high absorption capacity for CO (up to 0.046 mol mol(-1) ) was achieved under ambient conditions, compared with CO solubility in a commonly used IL [Bmim][Tf2 N] (2×10(-3)  mol mol(-1) ). The results of quantum mechanical calculations and spectroscopic investigation confirmed that the chemical interaction between the C-site in the carbanion and CO resulted in the superior CO absorption capacities...
April 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28444842/microwave-assisted-preparation-of-poly-ionic-liquid-modified-polystyrene-magnetic-nanospheres-for-phthalate-esters-extraction-from-beverages
#15
Gehui Liu, Ping Su, Lian Zhou, Yi Yang
The fabrication of novel poly(ionic liquid)-modified polystyrene magnetic nanospheres by a one-pot mini-emulsion copolymerization reaction was achieved through an efficient microwave-assisted synthesis method. The morphology, structure, and magnetic behavior of the as-prepared magnetic materials were characterized by using transmission electron microscopy, vibrating sample magnetometry, etc. The magnetic materials were utilized as sorbents for the extraction of phthalate esters from beverage samples followed by ultra-fast liquid chromatography analysis...
April 26, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28443844/transformation-of-the-ionic-liquid-emim-b-cn-4-into-anionic-and-neutral-lanthanum-tetracyanoborate-coordination-polymers-by-ionothermal-reactions
#16
Sven H Zottnick, Maik Finze, Klaus Müller-Buschbaum
The lanthanum tetracyanoborate coordination polymers [EMIM] [LaNO3{B(CN)4}3(H2O)3] (EMIM = 1-ethyl-3-methylimidazolium) and [La(NO3)2[B(CN)4](H2O)4] mark first examples of Ln-tetracyanoborates that have been obtained in ionothermal syntheses without further solvents to influence e.g. viscosity. Thereby, the ionic liquid [EMIM][B(CN)4] is fully incorporated into product formation.
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28443831/fabrication-of-size-controlled-nanoring-arrays-by-selective-incorporation-of-ionic-liquids-in-diblock-copolymer-micellar-cores
#17
Sung-Soo Kim, Donghwi Kang, Byeong-Hyeok Sohn
We report the synthesis of arrayed nanorings with tunable physical dimensions from thin films of polystyrene-<i>block</i>-poly(4-vinylpyridine) (PS-P4VP) micelles. For accurate control of the inner and outer diameters of the nanorings, we added imidazolium-based ionic liquids (ILs) into the micellar solution, which were eventually incorporated into the micellar cores. We observed the structural changes of the micellar cores coated on a substrate due to the presence of ILs. The spin-coated micellar cores were treated with an acidic precursor solution and generated toroid nanostructures, of which size depended on the amount of IL loaded into the micelles...
April 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28443326/ionic-liquid-silica-precursors-via-solvent-free-sol-gel-process-and-their-application-in-epoxy-amine-network-a-theoretical-experimental-study
#18
Magdalena Perchacz, Ricardo Keitel Donato, Leandro Seixas, Alexander Zhigunov, Rafal Konefal, Magdalena Serkis-Rodzeń, Hynek Benes
This work describes the solvent-free sol-gel synthesis of epoxy-functionalized silica-based precursors, in the presence of 1-butyl-3-methylimidazolium-based ionic liquids (ILs) containing different anions - chloride (Cl(-)) and methanesulfonate (MeSO3(-)). The IL-driven sol-gel mechanisms were investigated in details using experimental characterizations ((29)Si NMR and ATR FTIR spectroscopy) and a theoretical computational method based on density functional theory (DFT). We observed a complex IL's influence on both hydrolysis and condensation steps, involving especially H-bonding and Coulomb coupling stabilization of the process intermediates...
April 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440650/comprehensive-computational-and-experimental-analysis-of-biomaterial-towards-the-behavior-of-imidazolium-based-ionic-liquids-an-interplay-between-hydrophilic-and-hydrophobic-interactions
#19
Reddicherla Umapathi, Suresh B Vepuri, Pannuru Venkatesu, Mahmoud E S Soliman
To provide insights into the aggregation behavior, hydration tendency and variation in phase transition temperature produced by the addition of ionic liquids (ILs) to poly(N-isopropylacrylamide) (PNIPAM) aqueous solution, systematic physicochemical studies, and molecular dynamic simulations were carried out. The influence of ILs possessing same [Cl]- anion and a set of cation [Cnmim]+ with increasing alkyl chain length such as 1-ethyl-3-methylimidazolium ([Emim]+), 1-allyl-3-methylimidazolium ([Amim]+), 1-butyl-3-methylimidazolium ([Bmim]+), 1-hexyl-3-methylimidazolium ([Hmim]+), 1-benzyl-3-methylimidazolium ([Bzmim]+), and 1- decyl-3-methylimidazolium ([Dmim] +) on the phase transition of PNIPAM was monitored by the aid of UV-visible absorption spectra, fluorescence intensity spectra, viscosity (ɳ), dynamic light scattering (DLS) and Fourier transform infrared (FTIR) spectroscopy...
April 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28440638/dielectric-relaxation-of-the-ionic-liquid-1-ethyl-3-methylimidazolium-ethylsulfate-microwave-and-far-ir-properties
#20
Nilesh Ramchandra Dhumal, Johannes Kiefer, David Andrew Turton, Klaas Wynne, Hyung J Kim
Dielectric relaxation of the ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate (EMI(+)ETS(-)), is studied using molecular dynamics (MD) simulations. The collective dynamics of polarization arising from cations and anions are examined. Character- istics of the rovibrational and translational components of polarization dynamics are analyzed to understand their respective roles in the microwave and terahertz regions of dielectric relaxation. The MD results are compared with the experimental low- frequency spectrum of EMI(+)ETS(-), obtained via ultrafast optical Kerr effect (OKE) measurements...
April 25, 2017: Journal of Physical Chemistry. B
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