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Kshiti Singh, Nimisha Jadon, Rajeev Jain
Titanium oxide nanoparticles and 1-butyl-2,3-dimethylimidazolium bis (trifluoromethanesulfonyl) imide modified glassy carbon electrode (TiO2 /IL/GCE) has been fabricated for electrochemical sensing of flunarizine (FRH). The electrochemical properties and morphology of the prepared nanocomposite were studied by electrochemical impedance spectroscopy (EIS) and transmission electron microscopy (TEM). The response of the electrochemical sensor was found to be proportional to the concentrations of FRH in the range from 0...
March 2, 2018: Colloids and Surfaces. B, Biointerfaces
Duong Tung Pham, Joseph Paul Baboo, Jinju Song, Sungjin Kim, Jeonggeun Jo, Vinod Mathew, Muhammad Hilmy Alfaruqi, Balaji Sambandam, Jaekook Kim
Pyrite (FeS2 ) is a promising electrode material for lithium ion batteries (LIBs) because of its high natural availability, low toxicity, cost-effectiveness, high theoretical capacity (894 mA h g-1 ) and high theoretical specific energy density (1270 W h kg-1 , 4e- /FeS2 ). Nevertheless, the use of FeS2 in electrochemical capacitors was restricted due to fast capacity fading as a result of polysulfide (S/Sn 2- ) formation during the initial electrochemical cycling. In order to avoid the formation of polysulfides, we employed the strategy of utilizing an ether based electrolyte (1...
March 15, 2018: Nanoscale
Jesse Gatten McDaniel, Chang Yun Son, Arun Yethiraj
Room temperature ionic liquids composed of organic anions bis(trifluoromethanesulfonyl)imide (TFSI), bis(fluorosulfonyl)imide (FSI), and trifluoromethanesulfonate (OTf) exhibit interesting physical properties and are important for many electrochemical applications. TFSI and FSI form ``hydrophobic'' ionic liquids, immiscible with water but miscible with many organic solvents and polymers; for computer simulation studies, it is thus essential to develop force fields for these anions that are transferable among this wide variety of chemical environments...
March 14, 2018: Journal of Physical Chemistry. B
Dr Kunj Bihari Mishra, Adesh Kumar Singh, Jeyakumar Kandasamy
Tris(pentafluorophenyl)borane promoted stereoselective glycosylation with trichloroacetimidate glycosyl donors is described. The reactions proceed efficiently with a wide range of acceptors, from sugar to non-sugar, under mild conditions in the presence of a catalytic amount of B(C6F5)3. The perbenzylated glucosyl α-imidate provides β-selective glycosides in 70-92% yields.
March 14, 2018: Journal of Organic Chemistry
Yanjun Wan, Xuchun Zheng, Cheng Ma
A novel strategy to generate functionalized 1-azatriene intermediates for 6π electrocyclizations was developed by using readily accessible dienyne-imides and various terminal olefins under Pd(II) catalysis. Taking advantage of the sequential cooperation between preloaded and incorporated functional handles at 1,3-dien-5-yne skeletons, this protocol not only enables the selective generation of putative 1-azatrienes but significantly accelerates their thermal 6π-electrocyclic ring closure processes to a series of highly substituted furo[2,3-b]dihydropyridine derivatives in good yields...
March 13, 2018: Angewandte Chemie
Shugo Sato, Satoru Ohisa, Yukihiro Hayashi, Ryo Sato, Daisuke Yokoyama, Tetsuya Kato, Michinori Suzuki, Takayuki Chiba, Yong-Jin Pu, Junji Kido
A lot of research, mostly using electron-injection layers (EILs) composed of alkali-metal compounds has been reported with a view to increase the efficiency of solution-processed organic light-emitting devices (OLEDs). However, these materials have intractable properties, such as a strong affinity for moisture, which cause the degradation of OLEDs. Consequently, optimal EIL materials should exhibit high electron-injection efficiency as well as be stable in air. In this study, polymer light-emitting devices (PLEDs) based on the commonly used yellow-fluorescence-emitting polymer F8BT, which utilize poly(diallyldimethylammonium)-based polymeric ionic liquids, are experimentally and analytically investigated...
March 13, 2018: Advanced Materials
Steffen Jeschke, Patrik Johansson, Piotr Jankowski, Adam Best
Cyclodextrins (CDs) are pyranoside-based macromolecules with a hydrophobic cavity to encapsulate small molecules. They are used as molecular vehicles, for instance in pharmaceutical drug delivery or as solubility enhancer of monomers for their polymerization in aqueous solution. In this context, it was discovered about 10 years ago that the bis(trifluoromethylsulonyl)imide (TFSI) anion forms host-guest complexes with βCD in aqueous media. The rising interest in using the TFSI anion in lithium-based battery electrolytes open for its encapsulation by βCD as an attractive approach to increase the contribution of the cation to the total ion conductivity...
March 12, 2018: ChemSusChem
Saori Tanii, Mieko Arisawa, Takaya Tougo, Masahiko Yamaguchi
C-N-linked bi(heteroaryl)s are synthesized by a rhodium-catalyzed N-heteroarylation reaction of N-benzoyl heteroarenes including azoles/azolones, pyridones, cyclic ureas, and cyclic imides using heteroaryl aryl ethers. The reaction involves the covalent bond-exchange reaction of N-CO and HetAr-O bonds without using metal bases and exhibits a broad applicability, giving diverse C-N-linked bi(heteroaryl)s containing five- and six-membered heteroarenes. The N-heteroarylation of N-H azoles/azolones and pyridone proceeds at higher reaction temperatures...
March 12, 2018: Organic Letters
Hajo Meyer, Michael Meischein, Alfred Ludwig
A high-throughput method is presented for the efficient assessment of the formation and stability of nanoparticle suspensions in ionic liquids which differ in their cations and anions. As a proof of principle, Ag was sputtered on a cavity array filled with 9 different ionic liquids. Not all nanoparticle ionic liquid combinations form a stable suspension with separated nanoparticles. Directly after synthesis, the formation of non-agglomerated nanoparticle suspensions with sizes from 4 nm to 9 nm is observed by transmission electron microscopy as well as different time dependencies of the suspension stabilities...
March 9, 2018: ACS Combinatorial Science
Amélia M P S Gonçalves Da Silva
The interaction of two ionic liquids, trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)-imide and trihexyl(tetradecyl)phosphonium dicyanamide, [P6 6 6 14][Ntf2] and [P6 6 6 14]/ [N(CN)2], with several long chained lipids with a different net charge at the hydrophilic group, a cationic surfactant, dioctadecyldimethylammonium bromide (DODAB), a zwitterionic phospholipid (DPPC), an anionic phospholipid (DPPG) and the neutral stearic acid (SA), was investigated at the waterair interface using the Langmuir trough technique...
March 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Claudio Iacobucci, Samantha Reale, Massimiliano Aschi, Jos Oomens, Giel Berden, Francesco De Angelis
Brønsted acids and protic solvents mediate acyl transfer, known as Mumm rearrangement, from imidates to the corresponding acylamides. This represents a key step in several reactions, e.g. the Ugi-four component reaction (U-4CR) and Passerini-three component reaction (P-3CR). Herein we report an unprecedented break of the non-reversibility of the Mumm rearrangement. A combination of electrospray tandem mass spectrometry (ESI-MS/MS), infrared multiphoton dissociation (IRMPD) ion spectroscopy and theoretical calculations demonstrates the occurrence of the retro-Mumm rearrangement of protonated isopeptides in the gas-phase...
March 8, 2018: Chemistry: a European Journal
Fernando Rizzello, Ignazio Olivieri, Alessandro Armuzzi, Fabio Ayala, Vincenzo Bettoli, Luca Bianchi, Luca Cimino, Antonio Costanzo, Antonio Cristaudo, Salvatore D'Angelo, Marco Daperno, Anna Chiara Fostini, Mauro Galeazzi, Michele Gilio, Paolo Gionchetti, Paolo Gisondi, Ennio Lubrano, Antonio Marchesoni, Annamaria Offidani, Ambrogio Orlando, Daniela Pugliese, Carlo Salvarani, Raffaele Scarpa, Maurizio Vecchi, Giampiero Girolomoni
INTRODUCTION: Immune-mediated inflammatory diseases (IMIDs) are chronic autoimmune conditions that share common pathophysiologic mechanisms. The optimal management of patients with IMIDs remains challenging because the coexistence of different conditions requires the intervention of several specialists. The aim of this study was to develop a series of statements defining overarching principles that guide the implementation of a multidisciplinary approach for the management of spondyloarthritis (SpA)-related IMIDs including SpA, psoriasis, psoriatic arthritis, Crohn's disease, ulcerative colitis and uveitis...
March 7, 2018: Advances in Therapy
Jürgen Evers, Burkhard Krumm, Quirin Josef Axthammer, Joern Martens, Peter Blaha, Franz Xaver Steemann, Thomas Reith, Peter Mayer, Thomas Matthias Klapoetke
Isocyanic acid HNCO, the imide of carbon dioxide, was prepared by reaction of stearic acid and potassium cyanate (KOCN) at 60 oC in a sealed, thoroughly dried reactor. Interestingly, its crystal structure, solved by X-ray single crystal diffraction at 123(2) K, shows a group-subgroup relation for the NCO- anion to carbon dioxide: (CO2: cP12, Pa-3, a = 5.624(2) Å, 150 K, C-O 1.151(2) Å; HNCO: oP16, Pca21, a = 5.6176(9), b = 5.6236(8), c = 5.6231(7) Å, 123(2) K). Precise positions of H, N, C and O were determined by DFT calculations with WIEN2k leading to interatomic distances C-O 1...
March 7, 2018: Journal of Physical Chemistry. A
Barbara Bednarczyk-Cwynar, Piotr Ruszkowskp, Dmytro Atamanyuk, Roman Lesyk, Lucjusz Zaprutko
The synthesis and cytotoxic activity of new oleanolic acid derivatives (8a-c and 9a-c) are presented. The obtained compounds are hybrids of oleanolic acid oximes and carboxylic acids containing short alkyl chains linked with nitrogen atom of norbomene-2,3-dicarboximide moieties via the nitrogen atom. The structures of the obtained new compounds (8a-c and 9a-c) were confinmed by spectral data. The derivatives 8a-c and 9a-c were subjected to the MTT assay in order to evaluate their cytotoxic activity towards HeLa, KB, MCF-7, HepG2 and HDF cell lines in comparison to mother compound (oleanolic acid, 1)...
May 2017: Acta Poloniae Pharmaceutica
Milena Simic, Gordana Tasic, Predrag Jovanovic, Milos Petkovic, Vladimir Savic
A facile synthetic route has been developed for the preparation of pyrrolizinone derivatives employing N-allyl imides as starting materials. The nucleophilic addition of a vinyl Grignard reagent/RCM/elimination sequence afforded pyrrolizinones in good yields and has been applied for the preparation of naturally occurring quinolactacide and marinamide.
March 7, 2018: Organic & Biomolecular Chemistry
A Tsurumaki, F Trequattrini, O Palumbo, S Panero, A Paolone, M A Navarra
The effect of ether-functionalisation on ionic liquids (ILs) is discussed based on Kamlet-Taft parameters and the infrared (IR) spectra of N-ethoxyethyl-N-methylpiperidinium bis(trifluoromethanesulfonyl)imide ([P1,2O2 ][TFSI]) and N-ethoxyethyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide ([M1,2O2 ][TFSI]). The results are analysed taking into consideration their ion conformers, electronegativity and hardness, and the IR active vibrations obtained by means of DFT calculations. From the evaluation of Kamlet-Taft parameters, the ether-functionalisation in the cationic ring is found to improve the polarity and hydrogen bond acidity of the ILs...
March 7, 2018: Physical Chemistry Chemical Physics: PCCP
Antonio Santoru, Claudio Pistidda, Matteo Brighi, Michele R Chierotti, Michael Heere, Fahim Karimi, Hujun Cao, Giovanni Capurso, Anna-Lisa Chaudhary, Gökhan Gizer, Sebastiano Garroni, Magnus H Sørby, Bjørn C Hauback, Radovan Černý, Thomas Klassen, Martin Dornheim
The crystal structure of a mixed amide-imide phase, RbMgND2 ND, has been solved in the orthorhombic space group Pnma ( a = 9.55256(31), b = 3.70772(11) and c = 10.08308(32) Å). A new metal amide-hydride solid solution, Rb(NH2 )x H(1- x) , has been isolated and characterized in the entire compositional range. The profound analogies, as well as the subtle differences, with the crystal chemistry of KMgND2 ND and K(NH2 )x H1- x are thoroughly discussed. This approach suggests that the comparable performances obtained using K- and Rb-based additives for the Mg(NH2 )2 - 2LiH and 2LiN H2 -MgH2 hydrogen storage systems are likely to depend on the structural similarities of possible reaction products and intermediates...
March 7, 2018: Inorganic Chemistry
Laboni Das, Rahul Kumar, Dilip Kumar Maity, Soumyakanti Adhikari, Surajdevprakash B Dhiman, James F Wishart
A pulse radiolysis study on pyrrolidinium cation-based ionic liquids is presented herein. Time-resolved absorption spectra for 1-methyl-1-propylpyrrolidinium dicyanamide (DCA) at 500 ns after the electron pulse show broad absorption bands at wavelengths below 440 nm and at 640 nm. In pyrrolidinium bis(trifluoromethylsulphonyl)imide (NTf2) and tris(perfluoroethyl)trifluorophosphate (FAP) ILs, the transient absorption below 440nm is much weaker. The absorption at 500ns, which increases with wavelength from 500 nm to beyond 800 nm, was assigned to the tail of the solvated electron NIR absorption spectrum, since it disappears in the presence of N2O...
March 6, 2018: Journal of Physical Chemistry. A
Shengjun Liu, Jiandang Liu, Xudong Hou, Tingting Xu, Jing Tong, Junxiang Zhang, Bangjiao Ye, Bo Liu
We reported an example of MOF-based porous liquid by dispersing ZIF-8 ({Zn(mim)2}, mim = 2-methylimidazole) nanocrystallites in ionic liquid (IL) of [Bpy][NTf2] (N-butyl pyridinium bis(trifluoromethyl sulfonyl)imide). Two essential challenges, stable colloid formation and porosity retention, have been overcome to prepare MOF-based porous liquid. Preventing ZIF-8 nanocrystals from aggregation before dispersing is vital to form stable ZIF-8 colloid in IL via enhancing the interaction between ZIF-8 and IL. The resultant ZIF-8-[Bpy][NTf2] colloid is able to be stable over months without precipitating...
March 6, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Xiaoning Li, Wenli Guo, Yibo Wu, Wei Li, Liangfa Gong, Xiaoqian Zhang, Shuxin Li, Yuwei Shang, Dan Yang, Hao Wang
To identify ionic liquids (ILs) that could be used as solvents in isobutylene (IB) polymerization, the interactions between IB and eight different ILs based on the 1-butyl-3-methylimidazolium cation ([Bmim]+ ) were investigated using density functional theory (DFT). The anions in the ILs were chloride, hexafluorophosphate, tetrafluoroborate, bis[(trifluoromethyl)sulfonyl]imide, tetrachloroaluminate ([AlCl4 ]- ), tetrachloroferrate, acetate, and trifluoroacetate. The interaction geometries were explained by changes in the total energy, intermolecular distances, Hirshfeld charges, and the electrostatic potential surface...
March 6, 2018: Journal of Molecular Modeling
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