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Copper T

Rupali Deshmukh, Micha Calvo, Murielle Schreck, Elena Tervoort, Alla S Sologubenko, Markus Niederberger
We report a solution-phase approach to the synthesis of crystalline copper nanowires (Cu NWs) with aspect ratio > 1000 via a new catalytic mechanism comprising copper ions. The synthesis involves the reaction between copper(II) chloride and copper(II) acetylacetonate in a mixture of oleylamine and octadecene. Reaction parameters such as the molar ratio of precursors as well as the volume ratio of solvents offer the possibility to tune the morphology of the final product. A simple low-cost spray deposition method was used to fabricate Cu NW films on a glass substrate...
May 22, 2018: ACS Applied Materials & Interfaces
Nasrina Parvin, Shiv Pal, Jorge Echeverría, Santiago Alvarez, Shabana Khan
Previous theoretical and experimental endeavors suggested that [Cu(C6 H6 )]+ prefers the η1 /η2 mode over the η6 mode due to the augmented repulsion between the benzene ring and metal d-electrons. Nevertheless, the use of silylene as a neutral ligand has led to the isolation of the first monomeric copper cation, [{PhC(N t Bu)2 SiN(SiMe3 )2 }Cu(η6 -C6 H6 )]+ [SbF6 ]- ( 3 ), where a copper atom is bound to the benzene ring in an unsupported η6 fashion. However, the use of IPr (1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) in place of silylene results in the formation of [IPr·Cu(η2 -C6 H6 )]+ [SbF6 ]- ( 6 ), where the copper atom is bound to the benzene ring in the η2 mode...
May 14, 2018: Chemical Science
Martin C Schwarzer, Akane Fujioka, Takaoki Ishii, Hirohisa Ohmiya, Seiji Mori, Masaya Sawamura
Copper-catalyzed asymmetric direct alkynylation of α-ketoesters with terminal alkynes with chiral prolinol-phosphine ligands, most preferably (α R ,2 S )-1-(2-dicyclohexylphosphinobenzyl)-α-neopentyl-2-pyrrolidinemethanol, afforded various enantioenriched chiral propargylic tertiary alcohols. Quantum-chemical calculations using the BP86 density functional including Grimme's empirical dispersion correction [DF-BP86-D3(BJ)-PCM( t BuOH)/TZVPP//DF-BP86-D3(BJ)/SVP] show the occurrence of OH···O/sp3 -CH···O two-point hydrogen bonding between the chiral ligand and the carbonyl group of the ketoester in the stereo-determining transition states...
April 14, 2018: Chemical Science
Myrna Hurtado, Umesh T Sankpal, Jaya Chhabra, Deondra T Brown, Rajasekhar Maram, Rafid Patel, Raj K Gurung, Jerry Simecka, Alvin A Holder, Riyaz Basha
The non-steroidal anti-inflammatory drug, Tolfenamic acid (TA) acts as an anti-cancer agent in several adult and pediatric cancer models. Copper (Cu) is an important element with multiple biological functions and has gained interest in medical applications. Recently, [Cu(TA)2 (bpy)] (Cu-TA) has been synthesized in order to enhance therapeutic activity. In this study, we synthesized Cu-TA using an established method, characterized it by UV visible spectroscopy and Fourier-transform infrared spectroscopy (FTIR), and tested its anti-cancer activity using twelve cell lines representing various cancers, such as Ewing sarcoma, glioblastoma, medulloblastoma, neuroblastoma, pancreatic and prostate...
May 15, 2018: Investigational New Drugs
Francesca Gissi, Jenny L Stauber, Monique T Binet, Melanie A Trenfield, Joost W Van Dam, Dianne F Jolley
The mining and processing of nickel ores from tropical regions contributes 40% of the global supply. The potential impact of these activities on tropical marine ecosystems is poorly understood. Due to the lack of ecotoxicity data for tropical marine species, there is currently no available water quality guideline value for nickel that is specific to tropical species. In this study, we investigated the toxicity of nickel to three tropical marine invertebrates, the gastropod Nassarius dorsatus, the barnacle Amphibalanus amphitrite, and the copepod Acartia sinjiensis...
May 11, 2018: Ecotoxicology and Environmental Safety
Mohammad Abdul Baki, Md Muzammel Hossain, Jhuma Akter, Shamshad B Quraishi, Md Fajlul Haque Shojib, A K M Atique Ullah, Md Firoz Khan
A contaminated aquatic environment may end up in the food chain and pose risks to tourist health in a tourist destination. To assess the health risk for tourists that visit St. Martine Island, which is a popular domestic and foreign tourist destination in Bangladesh, a study is undertaken to analyse the level of heavy metal contamination from chromium (Cr), manganese (Mn), copper (Cu), zinc (Zn), arsenic (As), cadmium (Cd), lead (Pb), mercury (Hg) and iron (Fe) in six of the most consumed fish (L. fasciatus, R...
May 7, 2018: Ecotoxicology and Environmental Safety
E Atik, B Akarsu-Guven, I Kocadereli
Objective: The aim was to compare mandibular arch and incisor inclinational changes by comparing active self-ligating brackets used with different forms of archwires with a control group in nonextraction cases. Materials and Methods: The sample of 50 patients with Class I malocclusion was divided into three groups: Group I was treated with active self-ligating brackets (Nexus, Ormco/Orange, CA, USA) used with Damon arch form copper nickel-titanium (Cu-NiTi) and stainless steel (SS) wires; Group II was treated with interactive self-ligating bracket system (Empower, American Orthodontics, Sheboygan, Wis, USA) used with standard Cu-NiTi and SS wires; and Group III was treated with Roth prescribed conventional brackets (Forestadent, Pforzheim, Germany) with standard Cu-NiTi and SS wires which was designed as a control group...
May 2018: Nigerian Journal of Clinical Practice
M Mitrano, A A Husain, S Vig, A Kogar, M S Rak, S I Rubeck, J Schmalian, B Uchoa, J Schneeloch, R Zhong, G D Gu, P Abbamonte
A central mystery in high-temperature superconductivity is the origin of the so-called strange metal (i.e., the anomalous conductor from which superconductivity emerges at low temperature). Measuring the dynamic charge response of the copper oxides, [Formula: see text], would directly reveal the collective properties of the strange metal, but it has never been possible to measure this quantity with millielectronvolt resolution. Here, we present a measurement of [Formula: see text] for a cuprate, optimally doped Bi2...
May 7, 2018: Proceedings of the National Academy of Sciences of the United States of America
Shreyas Chavan, Deokgeun Park, Nitish Singla, Peter Sokalski, Kalyan Boyina, Nenad Miljkovic
Frost spreads on non-wetting surfaces during condensation frosting via an inter-droplet frost wave. When a supercooled condensate water droplet freezes on a hydrophobic or superhydrophobic surface, neighboring droplets still in the liquid phase begin to evaporate. Two possible mechanisms govern the evaporation of neighboring water droplets: (1) the difference in saturation pressure of the water vapor surrounding the liquid and frozen droplets induces a vapor pressure gradient, and (2) the latent heat released by freezing droplets locally heats the substrate, evaporating nearby droplets...
May 7, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Jian Zhao, Sybrand J T Jonker, Denise N Meyer, Göran Schulz, C Duc Tran, Lars Eriksson, Kálmán J Szabó
Tri- and tetrasubstituted allenylboronic acids were prepared via a new versatile copper-catalyzed methodology. The densely functionalized allenylboronic acids readily undergo propargylboration reactions with ketones and imines without any additives. Catalytic asymmetric propargylborylation of ketones is demonstrated with high stereoselectivity allowing for the synthesis of highly enantioenriched tertiary homopropargyl alcohols. The reaction is suitable for kinetic resolution of racemic allenylboronic acids affording alkynes with adjacent quaternary stereocenters...
April 7, 2018: Chemical Science
Pengfei Zhao, Yonghui Wang, Xuejia Kang, Aihua Wu, Weimin Yin, Yisi Tang, Jinyu Wang, Meng Zhang, Yifei Duan, Yongzhuo Huang
Tumor-associated macrophages (TAMs) are the major components in the tumor microenvironment (TME). The polarization from the protumor M2 (TAM2) to antitumor M1 (TAM1) phenotype can not only lift the immunosuppressive constraints and elicit cytotoxic T-cell immunity but also augment the chemotherapy efficacy. However, the treatment feasibility by TAM modulation in brain tumors and the mechanisms remained unknown. A dual-targeting biomimetic codelivery and treatment strategy was developed for anti-glioma activity...
March 14, 2018: Chemical Science
K Shrestha, K Gofryk
We have designed and developed a new experimental setup, based on the 3ω method, to measure thermal conductivity, heat capacity, and electrical resistivity of a variety of samples in a broad temperature range (2-550 K) and under magnetic fields up to 9 T. The validity of this method is tested by measuring various types of metallic (copper, platinum, and constantan) and insulating (SiO2 ) materials, which have a wide range of thermal conductivity values (1-400 W m-1 K-1 ). We have successfully employed this technique for measuring the thermal conductivity of two actinide single crystals: uranium dioxide and uranium nitride...
April 2018: Review of Scientific Instruments
Sharareh Eskandari, David Pattinson, Rachel Stephenson, Penny Groves, Simon Apte, Beta Sedaghat, Saranya Chandurudu, Denise Doolan, Istvan Toth
Adjuvant development and understanding the physicochemical properties of particles and interpreting the subsequent immunological responses is a challenge faced by many researchers in the vaccine field. We synthesized and investigated the physicochemical properties and immunogenicity of a library of multiple epitope self-adjuvant lipopeptides in a novel asymmetric arrangement. Vaccine candidates were synthesized using a combination of solid phase peptide synthesis and copper-mediated click chemistry. In-vivo studies showed that vaccine constructs containing a single OVA CD8+ T cell epitope and two N-terminally located C16 lipid moieties were more effective at generating robust cellular immune responses compared with the same molecule containing multiple copies of the OVA CD8+ T cell epitope with or without the C16 moieties...
April 29, 2018: Chemistry: a European Journal
Yu Wang, Hongjing Zhao, Juanjuan Liu, Yizhi Shao, Jinglun Li, Liyang Luo, Mingwei Xing
Arsenic and copper, two ubiquitous pollutants, can be oxidative stress inducers when organisms are heavy or chronically exposed, causing adverse effects on digestion and absorption function, resulting in potential losses to poultry husbandry. The present study examined the effects of arsenic trioxide (30 mg/kg)- and copper sulfate (300 mg/kg)-mixed foods, administered alone or in combination for 12 weeks, on various biochemical indices of oxidative stress and immunity in the small intestines of Hy-line chickens...
April 26, 2018: International Immunopharmacology
Yasaman-Sadat Borghei, Morteza Hosseini, Mohammad Reza Ganjali
In this study, we developed a colorimetric method which is primarily based on the limited amount of redox in response to the miRNA target analyte binding for the determination of the miRNA, which is used as a biomarker to confirm the clinical diagnosis of cancers such as breast cancer. This method is on the basis of the peroxidase-like property of DNA templated copper nanoclusters (DNA-CuNCs). In this research, it was found that the DNA (poly T) stabilized green emitting CuNCs which exhibited enzyme-like peroxidase activity...
April 25, 2018: Clinica Chimica Acta; International Journal of Clinical Chemistry
Yochai Wolf, Anat Shemer, Liron Levy-Efrati, Mor Gross, Jung-Seok Kim, Adrien Engel, Eyal David, Louise Chappell-Maor, Jonathan Grozovski, Ron Rotkopf, Inbal Biton, Raya Eilam-Altstadter, Steffen Jung
Microglia are resident immune cells in the central nervous system (CNS), strategically positioned to clear dead cells and debris, and orchestrate CNS inflammation and immune defense. In steady state, these macrophages lack major histocompatibility complex class II (MHCII) expression, but microglia activation can be associated with MHCII induction. Whether microglial MHCII serves antigen presentation for critical local T cell re-stimulation in CNS auto-immune disorders or modulates microglial signaling output remains under debate...
April 26, 2018: European Journal of Immunology
Elena P Zhiltsova, Tatiana N Pashirova, Marina R Ibatullina, Svetlana S Lukashenko, Aidar T Gubaidullin, Daut R Islamov, Olga N Kataeva, Marianna P Kutyreva, Lucia Y Zakharova
A new surfactant-copper(ii) complex [Cu(L)Br3] (where LBr is 1-cetyl-4-aza-1-azoniabicyclo[2.2.2]octane bromide) containing a transition metal in the head group has been synthesized and characterized. Physicochemical properties, thermal stability and 3D structure were determined using X-ray diffractometry, UV-vis spectroscopy, simultaneous thermogravimetry and differential scanning calorimetry combined with mass-spectrometry of evolved vapors. The study of the self-assembly and morphological features of associated structures was performed by potentiometry using a bromide ion selective electrode and fluorescence of pyrene and 1,6-diphenyl-1,3,5-hexatriene...
April 26, 2018: Physical Chemistry Chemical Physics: PCCP
Stefan Klingler, Vivek Amin, Stephan Geprägs, Kathrin Ganzhorn, Hannes Maier-Flaig, Matthias Althammer, Hans Huebl, Rudolf Gross, Robert D McMichael, Mark D Stiles, Sebastian T B Goennenwein, Mathias Weiler
We investigate yttrium iron garnet (YIG)/cobalt (Co) heterostructures using broadband ferromagnetic resonance (FMR). We observe an efficient excitation of perpendicular standing spin waves (PSSWs) in the YIG layer when the resonance frequencies of the YIG PSSWs and the Co FMR line coincide. Avoided crossings of YIG PSSWs and the Co FMR line are found and modeled using mutual spin pumping and exchange torques. The excitation of PSSWs is suppressed by a thin aluminum oxide interlayer but persists with a copper interlayer, in agreement with the proposed model...
March 23, 2018: Physical Review Letters
Nico M Bonanno, Alan J Lough, Martin T Lemaire
We describe the structural features and magnetic properties of two polynuclear copper(II) complexes containing a redox-active ligand. These neutral complexes each bear the formula RL4 Cu4 (R = t Bu, Me) with the ligand in a dianion-aminyl radical oxidation state. X-ray data and density functional theory calculations support an aminyl-type radical character in these complexes, making these the first polynuclear metal aminyl radical complexes.
April 25, 2018: Inorganic Chemistry
Jeanne Fichez, Guillaume Prestat, Patricia Busca
An unprecedented catalytic reductive cleavage of aromatic and heteroaromatic methyl ester functions was successfully achieved with a cheap, nontoxic, and air-stable Cu(OAc)2 catalyst. This reaction is fast, features good functional group tolerance, does not require inert atmosphere or anhydrous solvent, and can be scaled up to 1 g. Moreover, carboxylic acids and t-butyl esters also reacted smoothly under these conditions.
April 25, 2018: Organic Letters
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