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https://www.readbyqxmd.com/read/28638640/crystal-structure-of-n-n-di-decyl-pyromellitic-di-imide
#1
Hansu Im, Myong Yong Choi, Cheol Joo Moon, Tae Ho Kim
The title compound, C30H44N2O4 [systematic name: 2,6-di-decyl-pyrrolo-[3,4-f]iso-indole-1,3,5,7(2H,6H)-tetra-one], consists of a central pyromellitic di-imide moiety with terminal decyl groups at the N-atom positions. The centre of the mol-ecule lies on a crystallographic inversion centre so the asymmetric unit contains one half-mol-ecule. The mol-ecule exhibits a rod-shaped conformation, like other similar compounds of this type, the distance between the ends of terminal decyl groups being 32.45 Å. The packing is dominated by a lamellar arrangement of the mol-ecules, which is reinforced by C-H⋯O hydrogen bonds and C-O⋯π inter-actions, forming a classic herringbone structure...
June 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28636826/degradation-mechanisms-of-magnesium-metal-anodes-in-electrolytes-based-on-cf3so2-2n-at-high-current-densities
#2
Hyun Deog Yoo, Sang-Don Han, Igor L Bolotin, Gene M Nolis, Ryan D Bayliss, Anthony K Burrell, John T Vaughey, Jordi Cabana
The energy density of rechargeable batteries utilizing metals as anodes surpasses Li-ion batteries, which employ carbon instead. Among possible metals, magnesium represents a potential alternative to the conventional choice, lithium, in terms of storage density, safety, stability, and cost. However, a major obstacle for metal-based batteries is the identification of electrolytes that show reversible deposition/dissolution of the metal anode and support reversible intercalation of ions into a cathode. Traditional Grignard-based Mg electrolytes are excellent toward reversible deposition of Mg, but their limited anodic stability and compatibility with oxide cathodes hinder their applicability in Mg batteries with higher voltage...
June 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28633831/the-effects-of-organoclay-on-the-morphology-and-mechanical-properties-of-pai-clay-nanocomposites-coatings-prepared-by-the-ultrasonication-assisted-process
#3
Hamed Naderi-Samani, Reza Shoja Razavi, Mohammad Reza Loghman-Estarki, Mazaher Ramazani
In this research, solvent based polyamide - imide (PAI)/clay nanocomposites were prepared successfully using the solution dispersion technique. With the assistance of the ultrasonic wave, the effect of the ultrasonic wave time on the microstructure of 3wt% PAI/C20A nanocomposite (NC) was investigated. Then, the best ultrasonic parameters were selected and the effects of the concentration of Cloisite 20A (C20A) (1, 3 and 5wt% C20A) on the microstructure and mechanical properties (adhesion, hardness, flexibility, wear and impact) of NCs were investigated...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28632318/-the-easier-the-better-preparation-of-efficient-photocatalysts-metastable-poly-heptazine-imide-salts
#4
Zupeng Chen, Aleksandr Savateev, Sergey Pronkin, Vasiliki Papaefthimiou, Christian Wolff, Marc Georg Willinger, Elena Willinger, Dieter Neher, Markus Antonietti, Dariya Dontsova
Cost-efficient, visible-light-driven hydrogen production from water is an attractive potential source of clean, sustainable fuel. Here, it is shown that thermal solid state reactions of traditional carbon nitride precursors (cyanamide, melamine) with NaCl, KCl, or CsCl are a cheap and straightforward way to prepare poly(heptazine imide) alkali metal salts, whose thermodynamic stability decreases upon the increase of the metal atom size. The chemical structure of the prepared salts is confirmed by the results of X-ray photoelectron and infrared spectroscopies, powder X-ray diffraction and electron microscopy studies, and, in the case of sodium poly(heptazine imide), additionally by atomic pair distribution function analysis and 2D powder X-ray diffraction pattern simulations...
June 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28628209/nucleobase-protection-of-deoxyribo-and-ribonucleosides
#5
Geeta Meher, Nabin K Meher, Radhakrishnan P Iyer
Oligonucleotides carrying a variety of chemical modifications including conjugates are finding increasing applications in therapeutics, diagnostics, functional genomics, proteomics, and as research tools in chemical and molecular biology. The successful synthesis of oligonucleotides primarily depends on the use of appropriately protected nucleoside building blocks including the exocyclic amino groups of the nucleobases, the hydroxyl groups at the 2'-, 3'-, and 5'-positions of the sugar moieties, and the internucleotide phospho-linkage...
June 19, 2017: Current Protocols in Nucleic Acid Chemistry
https://www.readbyqxmd.com/read/28628164/long-alkyl-side-chains-impede-exciton-interaction-in-organic-light-harvesting-crystals
#6
Kalaivanan Nagarajan, Gopika Gopan, Rijo T Cheriya, Mahesh Hariharan
Side-chains at the imidic position of naphthalimide rendered a firm control over (i) the degrees of π-π overlap and (ii) distances between the perylenimide units in a crystalline naphthalimide-perylenimide dyad as determined using single crystal XRD and Hirshfeld surface analyses. Steady-state and time-resolved electronic spectroscopy in addition to DFT calculations revealed a decline in intermolecular excitonic interaction due to interfering alkyl chains.
June 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28627806/improving-the-quantum-yields-of-perylene-diimide-aggregates-by-increasing-molecular-hydrophobicity-in-polar-media
#7
Jodi Szarko, Jürgen Plenge, Xiaoyu Xu, Ashli Austin, Steven Mylon
Here we report the quantum yield of four aggregated perylene diimide (PDI) species that vary by the length of the branched side chains attached at the N,N' imide positions. The PDI molecules were dissolved in binary water:methanol solvents as a means to vary the solvent polarity and control the degree of aggregation in solution. By performing spectroscopy, kinetics, and light scattering experiments, the nature of the molecular interactions in the solutions was determined. The maximum quantum yield of the aggregated molecules increased from 0...
June 19, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28627530/ionic-liquids-containing-tricyanomethanide-anions-physicochemical-characterisation-and-performance-as-electrochemical-double-layer-capacitor-electrolytes
#8
Vitor L Martins, Anthony J R Rennie, Roberto M Torresi, Peter J Hall
We investigated the use of fluorine free ionic liquids (ILs) containing the tricyanomethanide anion ([C(CN)3]) as an electrolyte in electrochemical double-layer capacitors (EDLCs). Three cations were used; 1-butyl-3-methylimidazolium ([Im1,4]), N-butyl-N-methylpyrrolidinium ([Pyr1,4]) and N-butyl-N-methylpiperidinium ([Pip1,4]). Their physicochemical properties are discussed alongside with their performance as electrolytes. We found that the cyano-based ILs present higher ionic conductivity (9.4, 8.7 and 4...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28625143/infection-and-malignancy-risk-in-patients-treated-with-tnf-inhibitors-for-immune-mediated-inflammatory-diseases
#9
Rui Pereira, Raquel Faria, Paula Lago, Tiago Torres
BACKGROUND: Infectious and malignant events are responsible for morbidity and mortality in patients with Immune-Mediated Inflammatory Diseases (IMIDs). Anti-tumor necrosis factor (Anti-TNF) agents appear to have an impact, however the individual effect of these agents in the different conditions is still unclear. OBJECTIVE: The goal of this study is to estimate the Incidence Rates (IR) of infections and malignancies in patients treated with anti-TNFs across different IMIDs, as well as potential risk factors...
June 15, 2017: Current Drug Safety
https://www.readbyqxmd.com/read/28620163/natural-history-of-relapsed-myeloma-refractory-to-immunomodulatory-drugs-and-proteasome-inhibitors-a-multicenter-imwg-study
#10
S K Kumar, M A Dimopoulos, E Kastritis, E Terpos, H Nahi, H Goldschmidt, J Hillengass, X Leleu, M Beksac, M Alsina, A Oriol, M Cavo, E M Ocio, M V Mateos, E K O'Donnell, R Vij, H M Lokhorst, N W C J van de Donk, C Min, T Mark, I Turesson, M Hansson, H Ludwig, S Jagannath, M Delforge, C Kyriakou, P Hari, U Mellqvist, S Z Usmani, D Dytfeld, A Z Badros, P Moreau, K Kim, P R Otero, J H Lee, C Shustik, D Waller, W J Chng, S Ozaki, J-J Lee, J de la Rubia, H S Eom, L Rosinol, J J Lahuerta, A Sureda, J S Kim, B G M Durie
Introduction of new myeloma therapies offers new options for patients refractory to immunomodulatory drugs (IMiDs) and proteasome inhibitors (PIs). In this multicenter study, patients with relapsed multiple myeloma, who have received at least three prior lines of therapy, are refractory to both an IMiD (lenalidomide or pomalidomide) and a PI (bortezomib or carfilzomib), and have been exposed to an alkylating agent were identified. The time patients met the above criteria was defined as time zero (T0). Five hundred and forty-three patients diagnosed between 2006 and 2014 were enrolled in this study...
May 12, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28619588/a-system-map-for-the-ionic-liquid-stationary-phase-1-12-di-tripropylphosphonium-dodecane-bis-trifluoromethylsulfonyl-imide-trifluoromethanesulfonate-for-gas-chromatography
#11
Nicole Lenca, Colin F Poole
The solvation parameter model is used to prepare a system map for the retention of volatile organic compounds on the ionic liquid stationary phase 1,12-di(tripropylphosphonium)dodecane bis(trifluoromethylsulfonyl)imide trifluoromethanesulfonate (SLB-IL61) over the temperature range 80-260°C. Retention is governed by dispersion, dipole-type and hydrogen-bonding interactions each with its own temperature dependence. The exchange of a bis(trifluoromethylsulfonyl)imide anion in SLB-IL60 for a trifluromethanesulfonate anion (SLB-IL61) results in a change in selectivity indicated by an increase in the hydrogen-bond basicity and a decrease in hydrogen-bond acidity of the stationary phase without change in either the cohesion or dipolarity/polarizability of the stationary phases...
June 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28618176/bis-trifluoromethylsulfonyl-imide-based-frozen-ionic-liquid-for-the-hollow-fiber-solid-phase-microextraction-of-dichlorodiphenyltrichloroethane-and-its-main-metabolites
#12
Long Pang, Peijie Yang, Rong Pang, Shunyi Li
1-hexadecyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide is a solid-phase ionic organic material under ambient temperature, and is considered as a kind of "frozen" ionic liquid. Because of their solid-state and ultra-hydrophobicity, "frozen" ionic liquids are able to be confined in the pores of hollow fiber, based on which a simple method was developed for the hollow-fiber solid-phase microextraction of dichlorodiphenyltrichloroethane and its main metabolites. Under optimized conditions, the proposed method results in good linearity (R(2) > 0...
June 15, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28618145/novel-solid-state-lithium-conductors-for-lithium-metal-batteries-based-on-electrospun-nanofibers-and-plastic-crystal-composites
#13
Yundong Zhou, Xiaoen Wang, Haijin Zhu, Masahiro Yoshizawa-Fujita, Yukari Miyachi, Michel Armand, Maria Forsyth, George W Greene, Jennifer M Pringle, Patrick Howlett
Organic ionic plastic crystals (OIPCs) are a class of solid-state electrolyte with good thermal stability, non-flammability, non-volatility and good electrochemical stability. When prepared in a composite with electrospun polyvinylidene fluoride (PVdF) nanofibers, a 1:1 mixture of the OIPC N-ethyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide and LiFSI produced a free-standing, robust solid state electrolyte. These high concentration Li-containing electrolyte membranes had a transference number of 0.37 (± 0...
June 15, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28612074/cobaloxime-catalyzed-hydration-of-terminal-alkynes-without-acidic-promoters
#14
Shengtai Hou, Hongjian Yang, Bin Cheng, Hongbin Zhai, Yun Li
Cobaloxime (Co(dmgBF2)2·2H2O), an inexpensive first-row transition-metal complex, catalyzed hydration of terminal alkynes gave the corresponding methyl ketones in good to excellent yields under neutral conditions (additional protic acids and silver salts are not required). A wide range of functional groups, such as allyl ether, benzyl ethers, carboxylic esters, imides, amides, nitro, and halogens, were tolerated. The mild reaction conditions together with the inexpensive feature and easy availability of the catalyst well address the current challenges in the field of alkyne hydration...
June 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28609616/facile-synthesis-of-potassium-poly-heptazine-imide-phik-ti-based-metal-organic-framework-mil-125-nh2-composites-for-photocatalytic-applications
#15
Nicolás Artemio Rodríguez, Aleksandr Savateev, Maria Alejandra Grela, Dariya Dontsova
Photocatalytically active composites comprising potassium poly(heptazine imide) (PHIK) and a Ti-based Metal-Organic Framework (MOF, MIL-125-NH2) are prepared in-situ by simply dispersing both materials in water. The driving forces of composite formation are the electrostatic interactions between the solids and the diffusion of potassium ions from PHIK to MIL-125-NH2. This mechanism implies that other composites of poly(heptazine imide) salts and different MOFs bearing positive surface charge can potentially be obtained in a similar fashion...
June 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28608807/amphotericin-b-an-anti-fungal-medication-directly-increases-the-cytotoxicity-of-nk-cells
#16
Nayoung Kim, Ji-Wan Choi, Hye-Ran Park, Inki Kim, Hun Sik Kim
Immunomodulatory drugs (IMiDs) present one example of immunomodulatory agents that improve cancer immunotherapy. Based on the cytotoxic activity of natural killer (NK) cells against cancer cells, a high throughput screening method for the identification of novel immunomodulatory molecules with the potential to stimulate NK cell cytotoxicity against cancer cells was designed and tested using an approved drug library. Among the primary hit compounds, the anti-fungal drug amphotericin B (AMP-B) increased the cytotoxicity of NK cell line and human primary NK cells in a direct manner...
June 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28607968/an-excellent-rechargeable-pp14tfsi-ionic-liquid-dual-ion-battery
#17
Jiaxin Fan, Zhixiong Zhang, Yinhua Liu, Aiye Wang, Li Li, Wenhui Yuan
An ionic liquid dual-ion battery with pure 1-butyl-1-methylpiperidinium bis(trifluoromethylsulfonyl)imide as the electrolyte was developed, which exhibited a high discharge plateau initiated at 4.4 V, a well-defined capacity of 82 mA h g(-1), an ultrawide charge/discharge potential range of 1.0-5.0 V and a superior stability of ∼100% capacity retention for 600 cycles.
June 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28604866/metal-free-radical-oxidative-alkoxycarbonylation-and-imidation-of-alkanes
#18
Lijun Lu, Danyang Cheng, Yuanfeng Zhan, Renyi Shi, Chien-Wei Chiang, Aiwen Lei
A metal-free radical oxidative carbonylation of alkanes is demonstrated, yielding esters and imides by means of di-tert-butylperoxide as an oxidant. Various alkanes, alcohols and amides were compatible in this system generating the desired carbonyl products in up to 86% yields. We proposed a plausible radical cross-coupling process based on the preliminary mechanistic studies.
June 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28602285/electrochemical-preparation-of-standard-solutions-of-pb-ii-ions-in-ionic-liquid-for-analysis-of-hydrophobic-samples-the-olive-oil-case
#19
M Antonietta Baldo, Angela M Stortini, Ligia M Moretto, Michael Ongaro, Marco Roman, Paolo Ugo
In this paper we present an electrochemical approach to prepare standard solutions of metal ions in a room temperature ionic liquid (IL), which can find useful application for analysis in hydrophobic matrices. The method, developed here for the case of lead ions, is based on the galvanostatic dissolution of a lead anode dipped directly in a suitable IL, namely tri-hexyl(tetradecyl)phosphonium bis (trifluoromethylsulfonyl) imide ([P14,6,6,6](+)[NTf2](-)). After each oxidation step, the metal dissolution process in the IL solutions was monitored by cyclic voltammetric measurements at a glassy carbon disk electrode...
September 1, 2017: Talanta
https://www.readbyqxmd.com/read/28598436/11-efficiency-solid-state-dye-sensitized-solar-cells-with-copper-ii-i-hole-transport-materials
#20
Yiming Cao, Yasemin Saygili, Amita Ummadisingu, Joël Teuscher, Jingshan Luo, Norman Pellet, Fabrizio Giordano, Shaik Mohammed Zakeeruddin, Jacques-E Moser, Marina Freitag, Anders Hagfeldt, Michael Grätzel
Solid-state dye-sensitized solar cells currently suffer from issues such as inadequate nanopore filling, low conductivity and crystallization of hole-transport materials infiltrated in the mesoscopic TiO2 scaffolds, leading to low performances. Here we report a record 11% stable solid-state dye-sensitized solar cell under standard air mass 1.5 global using a hole-transport material composed of a blend of [Cu (4,4',6,6'-tetramethyl-2,2'-bipyridine)2](bis(trifluoromethylsulfonyl)imide)2 and [Cu (4,4',6,6'-tetramethyl-2,2'-bipyridine)2](bis(trifluoromethylsulfonyl)imide)...
June 9, 2017: Nature Communications
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