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Rui-Cheng Gao, Fu-Sheng Guo, Nan-Nan Bai, Yun-Long Wu, Fan Yang, Ji-Ye Liang, Zhen-Jing Li, Yao-Yu Wang
Two new three-dimensional isostructural lanthanide metal-organic frameworks (Ln(III)-MOFs), [LnL(H2O)3]·3H2O·0.75DMF (1-Ln; Ln = Dy(III) and Eu(III) ions, H3L = biphenyl-3'-nitro-3,4',5-tricarboxylic acid, DMF = N,N'-dimethylformamide), were synthesized and characterized. The appearance of temperature-dependent out-of-phase (χ″M) signal reveals that complex 1-Dy displays slow magnetic relaxation behavior with the energy barrier (ΔUeff) of 57 K and a pre-exponential factor (τ0) of 3.89 × 10(-8) s at 1200 Oe direct current field...
October 19, 2016: Inorganic Chemistry
Hadeel Adows, Yuming Zhao
The redox interactions between HAuCl4 and a series of π-conjugated organic donors, namely carboxylated dithiafulvenes and tetrathiafulvalene vinylogues, were investigated. Interestingly, the dithiafulvene derivative with two carboxylic groups showed the ability to directly induce the formation of Au(0) nanoparticles in dipolar aprotic solvents such as DMF and DMSO.
October 19, 2016: Chemical Communications: Chem Comm
Ian Swyer, Ronald Soong, Michael D M Dryden, Michael Fey, Werner E Maas, André Simpson, Aaron R Wheeler
Nuclear magnetic resonance (NMR) spectroscopy is extremely powerful for chemical analysis but it suffers from lower mass sensitivity compared to many other analytical detection methods. NMR microcoils have been developed in response to this limitation, but interfacing these coils with small sample volumes is a challenge. We introduce here the first digital microfluidic system capable of interfacing droplets of analyte with microcoils in a high-field NMR spectrometer. A finite element simulation was performed to assist in determining appropriate system parameters...
October 19, 2016: Lab on a Chip
Brenda Gomes Fanchiotti, Marcella Piffer Zamprogno Machado, Letícia Camilato de Paula, Mahmut Durmuş, Tebello Nyokong, Arlan da Silva Gonçalves, André Romero da Silva
The photobleaching of an unsubstituted phthalocyanine (gallium(III) phthalocyanine chloride (GaPc)) and a substituted phthalocyanine (1,4-(tetrakis[4-(benzyloxy)phenoxy]phthalocyaninato) indium(III) chloride (InTBPPc)) was monitored for the free photosensitizers and for the phthalocyanines encapsulated into nanoparticles of PEGylated poly(D,L-lactide-co-glycolide) (PLGA-PEG). Phosphate-buffered solutions (PBS) and organic solutions of the free GaPc or the free InTBPPc, and suspensions of each encapsulated photosensitizer (2-15μmol/L) were irradiated using a laser diode of 665nm with a power of 1-104mW and a light dose of 7...
October 11, 2016: Journal of Photochemistry and Photobiology. B, Biology
Katy Schäfer, Heiko Ihmels, Cornelia Bohne, Karolina Papera Valente, Anton Granzhan
It is shown by photometric and fluorimetric analysis, along with supporting theoretical calculations, that hydroxy-substituted benzo[b]quinolizinium derivatives display the characteristic features of organic photoacids. Specifically, the experimental and theoretical results confirm the strong acidity of these compounds in the excited state (pKa* < 0). The combination of the prototropic properties of the 8- and 9-hydroxybenzo[b]quinolizinium with the particular solvent-solute interactions of the excited acid and its conjugate base leads to a pronounced fluorosolvatochromism...
October 18, 2016: Journal of Organic Chemistry
Mary L Harrell, Thomas J Malinski, Coralys Torres López, Kimberly Gonzalez, Jakkrit Suriboot, David E Bergbreiter
The studies described in this paper show that hydrocarbon oligomers are alternatives for low molecular weight alkane solvents. These oligomeric solvents are nontoxic, nonvolatile, and recyclable alternatives to heptane in thermomor-phic solvent mixtures that use a polar solvent such as methanol, aqueous ethanol, or DMF or in biphasic mixtures that use acetonitrile. Regardless of which polar solvent is used, hydrocarbon oligomers like poly(-olefin)s (PAOs) exhibit very low leaching into the polar phase. UV-Visible spectroscopy studies show that these solvents have the solubility properties of heptane...
October 18, 2016: Journal of the American Chemical Society
Peng Zhang, Benhua Xu, Cunxu Gao, Guilin Chen, Meizhen Gao
Uniform Co9Se8 quantum dots (CSQDs) were successfully synthesized through a facile solvothermal method. The obtained CSQDs with average size of 3.2 ± 0.1 nm and thickness of 1.8 ± 0.2 nm were demonstrated good stability and strong fluorescence under UV light after being easily dispersed in both of N, N-dimethylformamide (DMF) and deionized water. We demonstrated the flexible resistive switching memory device based on the hybridization of CSQDs and polyvinylpyrrolidone (PVP) (CSQDs-PVP). The device with the Al/CSQDs-PVP/Pt/poly(ethylene terephthalate) (PET) structure represented excellent switching parameters such as high ON/OFF current ratio, low operating voltages, good stability and flexibility...
October 18, 2016: ACS Applied Materials & Interfaces
Maximiliano L Agazzi, M Belén Ballatore, Eugenia Reynoso, Ezequiel D Quiroga, Edgardo N Durantini
Two cationic BODIPYs 3 and 4 were synthesized by acid-catalyzed condensation of the corresponding pyrrole and benzaldehyde, followed by complexation with boron and methylation. Compound 3 contains methyl at the 1,3,5 and 7 positions of the s-indacene ring and a N,N,N-trimethylamino group attached to the phenylene unit, while 4 is not substituted by methyl groups and the cationic group is bound by an aliphatic spacer. UV-visible absorption spectra of these BODIPYs show an intense band at ∼500 nm in solvents of different polarities and n-heptane/sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/water reverse micelles...
October 3, 2016: European Journal of Medicinal Chemistry
Y Jiang, G Brunet, R J Holmberg, F Habib, I Korobkov, M Murugesu
A family of three dinuclear dysprosium complexes have been successfully synthesized and studied in terms of their magnetic properties. Complexes 1 and 2 share the formula [Dy2(ovph)2Cl2(solvent)2], where H2ovph = pyridine-2-carboxylic acid [(2-hydroxy-3-methoxyphenyl)methylene] hydrazide, and solvent = DMF (1), i-PrOH (2), while complex 3, [Dy2(ovph)2Cl2(H2O)3(EtOH)], exhibits differences in terms of the identity and number of coordinated solvent molecules. Thus, we investigate the impact of terminally bonded solvent molecules on the slow relaxation dynamics of {Dy2} SMMs, a parameter which can sometimes be overlooked in the quest to attain higher energy barriers...
October 17, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Tifeng Xia, Tao Song, Gege Zhang, Yuanjing Cui, Yu Yang, Zhiyu Wang, Guodong Qian
A series of isomorphic lanthanide metal-organic frameworks Ln(TATAB)(DMF)4(H2O)(MeOH)0.5 (LnTATAB, Ln = Eu, Tb, Sm, Dy, Gd, H3TATAB = 4,4',4''-s-triazine-1,3,5-triyltri-p-aminobenzoic acid) have been solvothermally synthesized and structure characterized. Among these MOFs, TbTATAB exhibits good water-stability and high quantum yield. Because mercury ions have a high affinity to nitrogen atoms, and the space between multi-nitrogen atoms from triazine and imino is suitable for interacting with Hg2+ ions, TbTATAB shows highly selective and sensitive detection of Hg2+ in aqueous solution with the detection limit of 4...
October 16, 2016: Chemistry: a European Journal
Sheena L Dupuy, Shahamat Tauhid, Shelley Hurwitz, Renxin Chu, Fawad Yousuf, Rohit Bakshi
INTRODUCTION: The objective of this pilot study was to compare cerebral gray matter (GM) atrophy over 1 year in patients starting dimethyl fumarate (DMF) for multiple sclerosis (MS) to that of patients on no disease-modifying treatment (noDMT). DMF is an established therapy for relapsing-remitting (RR) MS. METHODS: We retrospectively analyzed 20 patients with RRMS at the start of DMF [age (mean ± SD) 46.1 ± 10.2 years, Expanded Disability Status Scale (EDSS) score 1...
October 15, 2016: Neurology and Therapy
Olivier Galangau, Stephanie Delbaere, Nicolas Ratel-Ramond, Gwenael Rapenne, Ruiji Li, Jan Patrick Dela Cruz Calupitan, Takuya Nakashima, Tsuyoshi Kawai
In this manuscript, we present a novel concept for "smarter" photo-labile organic compounds combining not one but two caged functions. As proof of principle, this diarylethene-based compound possesses two inhibited chemical groups (OMe and OAc) and its efficient release in different solvents is reported. In low to medium polar media, both MeOH and AcOH are released, with a slight preferential uncaging of AcOH except in 1,4-dioxane where MeOH is preferentially released. On the contrary, DMSO or DMF render AcOH releasing strongly dominating...
October 14, 2016: Journal of Organic Chemistry
Matthew J Gilkey, Alexander V Mironenko, Leerang Yang, Dionisios G Vlachos, Bingjun Xu
The selective ring-opening of cellulose-derived furanic molecules is a promising pathway for the production of industrially relevant linear oxygenates, such as 1,6-hexanediol. 2,5-Dimethylfuran (DMF) is employed as a model compound in a combined experimental and computational investigation to provide insights into the metal-catalyzed ring-opening. Ring-opening to 2-hexanol and 2-hexanone and ring-saturation to 2,5-dimethyltetrahydrofuran (DMTHF) are identified as two main parallel pathways. DFT calculations and microkinetic modeling indicate that DMF adsorbs on Ru in an open-ring configuration, which is potentially a common surface intermediate that leads to both ring-opening and ring-saturation products...
October 14, 2016: ChemSusChem
Xiaowen Chang, Weiping Li, Haining Chen, Liqun Zhu, Huicong Liu, Huifang Geng, Sisi Xiang, Jiaming Liu, Xiaoli Zheng, Ying-Long Yang, Shihe Yang
Carbon-based hole transport materials (HTM)-free perovskite solar cells (PSCs) due to their relatively high stability have attracted intense attention. However, their power conversion efficiency (PCE) is still low, especially for the simplest paintable carbon-based PSCs (C-PSCs), whose performance is greatly limited by the poor contact at perovskite/carbon interface. To enhance interface contact, it is important to fabricate an even-surface perovskite layer in porous scaffold, which is usually unfeasible due to rough crystal precursor...
October 14, 2016: ACS Applied Materials & Interfaces
N Milanesi, G Bartolini, S Francalanci, M Gola
Dimethyl fumarate (DMF), the methyl ester form of fumaric acid (DMF) is an effective mold-growth inhibitor. It has a wide-spectrum biocide activity and has been used to protect leather during storage and transport. DMF was first identified as a potent contact sensitizer during a contact dermatitis outbreak that occurred because of its use in Chinese manufactured furniture (1,2). This article is protected by copyright. All rights reserved.
October 14, 2016: Journal of the European Academy of Dermatology and Venereology: JEADV
Francesco Trotta, Fabrizio Caldera, Roberta Cavalli, Marco Soster, Chiara Riedo, Miriam Biasizzo, Gloria Uccello Barretta, Federica Balzano, Valentina Brunella
BACKGROUND: L-DOPA is an amino acid precursor to the neurotransmitter dopamine that is extensively used as a prodrug for the treatment of Parkinson's disease. However, L-DOPA is an unstable compound: when exposed to light or added to aqueous solutions, it may degrade, compromising its therapeutic properties. RESEARCH DESIGN AND METHODS: In this work, a new type of drug-loaded cyclodextrin-based nanosponge, obtained using molecular imprinting, is described for the prolonged and controlled release of L-DOPA...
October 13, 2016: Expert Opinion on Drug Delivery
Ruihe Lin, Jingli Cai, Eric W Kostuk, Robert Rosenwasser, Lorraine Iacovitti
BACKGROUND: Dimethyl fumarate (DMF), working via its metabolite monomethylfumarate (MMF), acts as a potent antioxidant and immunomodulator in animal models of neurologic disease and in patients with multiple sclerosis. These properties and their translational potential led us to investigate whether DMF/MMF could also protect at-risk and/or dying neurons in models of ischemic stroke in vitro and in vivo. Although the antioxidant effects have been partially addressed, the benefits of DMF immunomodulation after ischemic stroke still need to be explored...
October 13, 2016: Journal of Neuroinflammation
Robert J Fox, Andrew Chan, Annie Zhang, James Xiao, Dane Levison, James B Lewin, Michael R Edwards, Jing L Marantz
Objective Delayed-release dimethyl fumarate (DMF; also known as gastro-resistant DMF) and fingolimod are approved oral disease-modifying treatments for relapsing-remitting multiple sclerosis. In phase 3 trials, DMF (DEFINE/CONFIRM) and fingolimod (FREEDOMS/FREEDOMS II) resulted in significant reductions in clinical and magnetic resonance imaging activity, with acceptable safety profiles. Direct comparisons of these treatments are not possible due to a lack of head-to-head trials. We compared 2-year efficacy of DMF versus fingolimod at the approved dosage using a matching-adjusted indirect approach...
October 13, 2016: Current Medical Research and Opinion
Azizur Rehman, Muhammad Athar Abbasi, Sabahat Zahra Siddiqui, Ayesha Mohyuddin, Sohail Nadeem, Syed Adnan Shah
New potent organic compounds were synthesized with an aim of good biological activities such as antibacterial and anti-enzymatic. Three series of sulfonamide derivatives were synthesized by treating N-alkyl/aryl substituted amines (2a-f) with 4-chlorobenzensulfonyl chloride (1) to yield N-alkyl/aryl-4-chlorobenzenesulfonamide(3af) that was then derivatized by gearing up with ethyl iodide (4), benzyl chloride (5) and 4-chlorobenzyl chloride (6) using sodium hydride as base to initialize the reaction in a polar aprotic solvent (DMF) to synthesize the derivatives, 7a-f, 8af and 9a-f respectively...
September 2016: Pakistan Journal of Pharmaceutical Sciences
Chris S Hawes, Kevin Byrne, Wolfgang Schmitt, Thorfinnur Gunnlaugsson
Two new luminescent ditopic naphthalimide-derived ligands, N-(4-cyanophenylmethylene)-4-(4-cyanophenoxy)-1,8-naphthalimide (L3) and N-(4-carboxyphenylmethylene)-4-(4-carboxyphenoxy)-1,8-naphthalimide (H2L4), have been prepared, and their coordination chemistry has been explored in the synthesis of three new coordination polymer materials. Complex poly-[Ag(L3)2]BF4·4.5H2O·0.5THF (1) is a 3-fold 2D → 2D parallel interpenetrated coordination polymer in which three interwoven sheets define inter- and intralayer channels containing anions and solvent molecules...
October 12, 2016: Inorganic Chemistry
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