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https://www.readbyqxmd.com/read/29168909/in-situ-generated-ruthenium-arene-catalyst-for-photoactivated-ring-opening-metathesis-polymerization-through-photolatent-n-heterocyclic-carbene-ligand
#1
Julien Pinaud, Thi Kim Hoang Trinh, David Sauvanier, Emeline Placet, Sriprapai Songsee, Patrick Lacroix-Desmazes, Jean-Michel Becht, Bassam Tarablsi, Jacques Lalevée, Loïc Pichavant, Valérie Héroguez, Abraham Chemtob
1,3-Bis(mesityl)imidazolium tetraphenylborate (IMesH+ BPh4-) can be synthesized in one step by anion metathesis between the corresponding imidazolium chloride and sodium tetraphenylborate. In the presence of 2-isopropylthioxanthone (sensitizer), IMes N-heterocyclic carbene (NHC) ligand can be photogenerated under irradiation at 365 nm through coupled electron/proton transfer reactions. By combining this tandem NHC photogenerator system with metathesis inactive [RuCl2(p-cymene)]2 precatalyst, the highly active RuCl2(p-cymene)(IMes) complex can be formed in situ, enabling a complete ring-opening metathesis polymerization (ROMP) of norbornene in the matter of minutes at room temperature...
November 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29168620/simple-organic-salts-having-naphthalenediimide-ndi-core-displaying-multi-functional-properties-gelation-anti-cancer-and-semiconducting-properties
#2
Parthasarathi Dastidar, Rumana Parveen, Nabasmita Maity
Following a supramolecular synthon rationale a dicarboxylic acid derivative having naphthalenediimide (NDI) core namely bis-N-carboxymethyl naphthalenediimide (NDI-A) was reacted with n-alkyl amines having varying alkyl chain length to generate a new series of primary ammonium dicarboxylate (PAD) salts. Majority of the salts (~85%) were found to gel various polar solvents. The gels were characterized by dynamic rheology and high resolution electron microscopy. Single crystal and powder X-ray diffraction were employed to study the supramolecular synthon present in one of the gelator salts namely S8...
November 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29168524/confined-naked-gold-nanoparticles-in-ionic-liquid-films
#3
Luciane Calabria, Jesum A Fernandes, Pedro Migowski, Fabiano Bernardi, Daniel L Baptista, Rafael Leal, Thomas Grehl, Jairton Dupont
Surface-clean Au nanoparticles (NPs) confined in films of ionic liquids (ILs) can be easily fabricated by sputtering deposition. A silicon wafer coated with films of both hydrophobic (bis((trifluoromethyl)sulfonyl)amide, NTf2(-)) and hydrophilic (tetrafluoroborate, BF4(-)) imidazolium-based ILs forms an 'ionic carpet-like' structure that can be easily decorated with Au NPs of 5.1 and 6.5 nm mean diameter, respectively. The depth profile distribution of the Au NPs depends on the arrangement of the IL, which is controlled mainly by the anion volume...
November 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/29166213/relationship-of-ptsd-with-impulsivity-dimensions-while-controlling-the-effect-of-anxiety-and-depression-in-a-sample-of-inpatients-with-alcohol-use-disorder
#4
Cuneyt Evren, Gokhan Umut, Muge Bozkurt, Bilge Evren
OBJECTIVE: The aim of the present study was to evaluate the relationship of posttraumatic stress disorder (PTSD) with impulsivity dimensions while controlling the effect of anxiety and depression in a sample of inpatients with alcohol use disorder (AUD). METHODS: Participants were 190 male patients admitted to a specialized center for substance use disorders within a six month period. Participants were evaluated with the State-Trait Anxiety Inventory (STAI), Beck Depression Inventory (BDI), the Short Form Barratt Impulsiveness Scale (BIS-11-SF), the Traumatic Experiences Checklist (TEC) and PTSD Checklist Civilian version (PCL-C)...
November 22, 2017: Journal of Dual Diagnosis
https://www.readbyqxmd.com/read/29166109/temperature-and-chain-length-dependence-of-ultrafast-vibrational-dynamics-of-thiocyanate-in-alkylimidazolium-ionic-liquids-a-random-walk-on-a-rugged-energy-landscape
#5
Thomas Brinzer, Sean Garrett-Roe
Ultrafast two-dimensional infrared spectroscopy of a thiocyanate vibrational probe (SCN(-)) was used to investigate local dynamics in alkylimidazolium bis-[trifluoromethylsulfonyl]imide ionic liquids ([Imn,1][Tf2N], n = 2, 4, 6) at temperatures from 5 to 80 °C. The rate of frequency fluctuations reported by SCN(-) increases with increasing temperature and decreasing alkyl chain length. Temperature-dependent correlation times scale proportionally to temperature-dependent bulk viscosities of each ionic liquid studied...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166097/volatility-of-the-catalytic-hydrogenation-products-of-1-4-bis-phenylethynyl-benzene
#6
Hom N Sharma, Elizabeth A Sangalang, Cheng K Saw, Gareth A Cairns, William McLean, Robert S Maxwell, Long N Dinh
Measurements of equilibrium vapor pressures by effusion thermogravimetry and melting points by differential scanning calorimetry reveal that the melting temperature and equilibrium vapor pressures of 1,4-bis(phenylethynyl)benzene (DEB) do not vary monotonically with the hydrogenation extent. Contrary to intuition which suggests increasing volatility with hydrogenation, results indicate decreasing volatility for the first two hydrogenation steps before a non-monotonic upward trend, in which trans-isomers are less volatile...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166092/the-influence-of-mesoscopic-confinement-on-the-dynamics-of-imidazolium-based-room-temperature-ionic-liquids-in-polyether-sulfone-membranes
#7
Joseph E Thomaz, Heather E Bailey, Michael D Fayer
The structural dynamics of a series of 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (CnmimNTf2, n = 2, 4, 6, 10: ethyl-Emim; butyl-Bmim; hexyl-Hmim; decyl-Dmim) room temperature ionic liquids confined in the pores of polyether sulfone (PES 200) membranes with an average pore size of ∼350 nm and in the bulk liquids were studied. Time correlated single photon counting measurements of the fluorescence of the fluorophore coumarin 153 (C153) were used to observe the time-dependent Stokes shift (solvation dynamics)...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166016/enantioselective-friedel-crafts-alkylation-between-nitroalkenes-and-indoles-catalyzed-by-charge-activated-thiourea-organocatalysts
#8
Yang Fan, Steven Robert Kass
A series of methylated and octylated pyridinium and quinolinium containing thiourea salts with a chiral 2-indanol substituent are reported. These organocatalysts are positively charged analogs of privileged bis(3,5-trifluoromethyl)phenyl substituted thioureas, and are found to be much more active catalysts despite the absence of an additional hydrogen bond donor or acceptor site (i.e., the presence of a heteroatom-hydrogen or heteroatom). Friedel-Crafts reactions of trans-β-nitorostyrenes with indoles are examined and good yields and enantioselectivities are obtained...
November 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29166013/slow-magnetic-relaxation-in-a-dysprosium-ammonia-metallocene-complex
#9
Selvan Demir, Monica D Boshart, Jordan F Corbey, David H Woen, Miguel I Gonzalez, Joseph W Ziller, Katie R Meihaus, Jeffrey R Long, William J Evans
We report the serendipitous discovery and magnetic characterization of a dysprosium bis(ammonia) metallocene complex, [(C5Me5)2Dy(NH3)2](BPh4) (1), isolated in the course of performing a well-established synthesis of the unsolvated cationic complex [(C5Me5)2Dy][(μ-Ph)2BPh2]. While side reactivity studies suggest that this bis(ammonia) species owes its initial incidence to impurities in the DyCl3(H2O)x starting material, we were able to independently prepare 1 and its tetrahydrofuran (THF) derivative, [(C5Me5)2Dy(NH3)(THF)](BPh4) (2), from the reaction of [(C5Me5)2Dy][(μ-Ph)2BPh2] with ammonia in THF...
November 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29166008/porous-scaffolds-for-electrochemically-controlled-reversible-capture-and-release-of-ethylene
#10
Lukasz Mendecki, Michael Ko, Xiaoping Zhang, Zheng Meng, Katherine A Mirica
This Communication describes the use of porous coordination polymers (PCP) with integrated metal bis(dithiolene) units to achieve electrochemically controlled capture and release of ethylene in the solid state. Applying positive potential (+2.0 V) to these PCPs promotes ethylene capture, and subsequent dose of negative potential (-2.0 V) induces the release. These materials are resistant to poisoning by small reactive gases (CO and H2S) that may interact with embedded metallic sites.
November 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29166002/structure-and-affinity-of-cu-i-bound-to-human-serum-albumin
#11
Madison Sendzik, M Jake Pushie, Ewelina Stefaniak, Kathryn L Haas
Human serum albumin (HSA) is a major Cu carrier in human blood and in cerebrospinal fluid. A major assumption is that Cu bound to HSA is in the Cu(II) oxidation state; thus, interactions between HSA and Cu(II) have been intensely investigated for over four decades. HSA has been reported previously to support the reduction of Cu(II) to the Cu(I) oxidation state in the presence of the weak reductant, ascorbate; however, the interactions between HSA and Cu(I) have not been explicitly investigated. Here, we characterize both the apparent affinity of HSA for Cu(I) using solution competition experiments and the coordination structure of Cu(I) bound to HSA using X-ray absorption spectroscopy and in silico modeling...
November 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29165989/bispentafluorophenyl-containing-additive-enhancing-efficiency-and-morphological-stability-of-polymer-solar-cells-via-hand-grabbing-like-supramolecular-pentafluorophenyl-fullerene-interactions
#12
Kai-En Hung, Che-En Tsai, Shao-Ling Chang, Yu-Ying Lai, U-Ser Jeng, Fong-Yi Cao, Chain-Shu Hsu, Chun-Jen Su, Yen-Ju Cheng
A new class of additive materials bis(pentafluorophenyl) diesters (BFEs) where the two pentafluorophenyl (C6F5) moieties are attached at the both ends of a linear aliphatic chain with tunable tether lengths (BF5, BF7, and BF13) were designed and synthesized. In the presence of the BF7 to restrict the migration of fullerene by hand-grabbing-like supramolecular interactions induced between the C6F5 groups and the surface of fullerene, the P3HT:PC61BM:BF7 device showed stable device characteristics after thermal heating at 150 oC for 25 h...
November 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29165843/pillar-5-arenes-based-supramolecular-organic-framework-with-multi-guests-detection-and-recyclable-separation-properties
#13
Qi Lin, Yan-Qing Fan, Peng-Peng Mao, Lu Liu, Juan Liu, You-Ming Zhang, Hong Yao, Tai-Bao Wei
The selective detection and separation of target ions or molecules is an intriguing issue. Herein, a novel supramolecular organic framework (SOF-THBP) was constructed by bis-thioacetylhydrazine functionalized pillar[5]arenes. The SOF-THBP shows fluorescent response for Fe3+, Cr3+, Hg2+ and Cu2+. The xerogel of SOF-THBP shows excellent recyclable separation properties for these metal ions and the absorption rates were up to 99.29%. More interestingly, by rationally introduced these metal ions into the SOF-THBP, a series of metal ions coordinated SOFs (MSOFs) such as MSOF-Fe, MSOF-Hg and MSOF-Cu were constructed...
November 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29165491/fe3o4-aunps-anchored-2d-metal-organic-framework-nanosheets-with-dna-regulated-switchable-peroxidase-like-activity
#14
Bing Tan, Huimin Zhao, Weihao Wu, Xuan Liu, Yaobin Zhang, Xie Quan
Two-dimensional (2D) metal-organic framework (MOF) nanosheets emerging as a new member of the 2D family have received significant research interest in recent years. Herein, we have successfully synthesized 2D copper-based MOF nanosheets with bimetallic anchorage using a facile two-step process at room temperature and ambient pressure, denoted as Cu(HBTC)-1/Fe3O4-AuNPs nanosheets. The as-synthesized 2D bimetallic MOF nanosheets displayed enhanced peroxidase-like activity with relatively high catalytic velocity and affinity for substrates compared with previously reported peroxidase mimics...
November 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/29165478/acid-catalyzed-reaction-of-2-hydroxycyclobutanone-with-benzylic-alcohols
#15
Alberto Martis, Alberto Luridiana, Angelo Frongia, Massimiliano Arca, Giorgia Sarais, David J Aitken, Regis Guillot, Francesco Secci
The acid-promoted syntheses of 2-(benzyloxy)cyclobutanones and bis(benzyloxy)dioxatricyclo decanes were achieved starting from 2-hydroxycyclobutanone and variously functionalized benzyl alcohols. The reaction sequences afforded the desired products in good to high yields and in a solvent-dependent chemoselective fashion.
November 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29165473/large-cu-chalcogenone-cubic-cages-with-non-interacting-counter-ions
#16
Srinivas Katam, Prabusankar Ganesan
Two mega size copper(i) cubic cages, [{Cu(Bptp)1.5}8(PF6(-))](PF6(-))7 (1) and [{Cu(Bpsp)1.5}8(PF6(-))](PF6(-))7 (2), supported by imidazole-2-chalcogenone ligands (Bptp = 2,6-bis(1-isopropylimidazole-2-thione)pyridine and Bpsp = 2,6-bis(1-isopropylimidazole-2-selone)pyridine) have been synthesized and characterized. The formation of ionic salts 1 and 2 was confirmed by FT-IR, multinuclear ((1)H, (13)C, (31)P and (19)F) NMR, UV-vis, TGA, CHN analysis, BET analysis, single crystal X-ray diffraction and powder X-ray diffraction techniques...
November 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29165468/regioisomerism-in-coordination-chemistry-oxidative-addition-of-a-bifunctional-ligand-to-palladium-stabilized-with-1-2-bis-diphenylphosphino-ethane
#17
K A Martyanov, V K Cherkasov, G A Abakumov, E V Baranov, A S Shavyrin, V A Kuropatov
A unique phenomenon of regioisomerism in coordination chemistry was discovered: the reaction of a sterically hindered o-quinone annelated with a dithiete ring with Pd2dba3 in the presence of 1,2-bis(diphenylphosphino)ethane (dppe) gave a mixture of two regioisomers: catecholate 3Cat and dithiolate 3Dit. Both isomers were isolated in crystalline form and characterized by NMR, IR and X-ray diffractometry studies. DFT calculations reveal that the 3Dit species is more thermodynamically stable than the isomer 3Cat...
November 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29165458/the-effect-of-structural-modifications-on-the-thermal-stability-melting-points-and-ion-interactions-for-a-series-of-tetraaryl-phosphonium-based-mesothermal-ionic-liquids
#18
Cody A Cassity, Benjamin Siu, Mohammad Soltani, Jimmy L McGeehee, Katie J Strickland, Matt Vo, E Alan Salter, Alexandra C Stenson, Andrzej Wierzbicki, Kevin N West, Brooks D Rabideau, James H Davis
A family of mesothermal ionic liquids comprised of tetraarylphosphonium cations and the bis(trifluoromethanesulfonyl)amidate anion are shown to be materials of exceptional thermal stability, enduring (without decomposition) heating in air at 300 °C for three months. It is further established that three specific structural elements - phenoxy, phenacyl, and phenyl sulfonyl - can be present in the cation structures without compromising their thermal stability, and that their incorporation has specific impacts on the melting points of the salts...
November 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29165338/action-of-monomeric-gemini-surfactants-on-free-cells-and-biofilm-of-asaia-lannensis
#19
Anna Koziróg, Dorota Kręgiel, Bogumił Brycki
We investigated the biological activity of surfactants based on quaternary ammonium compounds: gemini surfactant hexamethylene-1,6-bis-(N,N-dimethyl-N-dodecylammonium bromide) (C6), synthesized by the reaction of N,N-dimethyl-N-dodecylamine with 1,6-dibromohexane, and its monomeric analogue dodecyltrimethylammonium bromide (DTAB). The experiments were performed with bacteria Asaia lannensis, a common spoilage in the beverage industry. The minimal inhibitory concentration (MIC) values were determined using the tube standard two-fold dilution method...
November 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29165092/synthesis-characterization-and-biological-activities-of-new-symmetric-bis-1-2-3-triazoles-with-click-chemistry
#20
Fatih Celik, Yasemin Unver, Burak Barut, Arzu Ozel, Kemal Sancak
BACKGROUND: 1,2,3-Triazole and its derivatives have important biological activities such as antimicrobial, anti-allergic, analgesic, anti-HIV, antiinflammatory, anticancer, antimalarial and antituberculosis. Other significant triazole derivatives are 1,2,4-triazoles which play a very important role in the medicinal chemistry due to the antiinflammatory, antimicrobial, antimigraine, anticancer, antimicrobial and antimycotic activities. In this study, we aimed to synthesize a new series of bis-1,2,3-triazole derivatives including 1,2,4-triazole to obtain more effective biological activities METHODS: In this study, a new series of bis-1,2,3-triazole compounds (9,10,11) were synthesized...
November 20, 2017: Medicinal Chemistry
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