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5.823 Aktuelle Fachpublikationen zum Thema temperature

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A double‐tailed acrylamide hydrophobically associating polymer: Synthesis, characterization, and solution properties

24.06.2015 | Feng Jiang, Wanfen Pu, Yibo Li, Daijun Du, Journal of Applied Polymer Science, 2015

ABSTRACT In order to improve the salt resistant, temperature tolerance, and stability of the acrylamide‐based copolymer, the double‐tailed hydrophobically associating copolymer (DTHAP) was synthesized. The chemical and spatial network structures of the copolymer were characterized by Fourier ...

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Synthesis, Structural, Magnetic and phase-transition studies of the Ferromagnetic La2CoMnO6 double perovskite by symmetry-adapted modes

24.06.2015 | Brahim Orayech; Irene Urcelay-Olabarria; Gabriel A. López; Oscar Fabelo; Abdessamad Faik; Josu Mirena Igartua, Dalton Transactions, 2015

Powder La2CoMnO6 double perovskite was synthesized by the solid-state reaction method, and its crystal structure was investigated by Rietveld analysis (using mode-crystallography) by X-ray and neutron powder diffraction data. La2CoMnO6 material is monoclinic perovskite at room temperature, ...

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Synthesis and characterization of hydroxy‐terminated polyether‐polydimethylsiloxane‐polyether (PE‐PDMS‐PE) triblock oligomers and their use in the preparation of thermoplastic polyurethanes

23.06.2015 | Zeliang Dai, Kai Yang, Qingzhi Dong, Journal of Applied Polymer Science, 2015

ABSTRACT A series of hydroxy‐terminated polyether‐polydimethylsiloxane‐polyether (α,ω‐dihydroxy‐(PE‐PDMS‐PE)) ABA triblock oligomers were synthesized from silanic fluids and methyl polyallyloxide polyethers. The reaction was a one‐step solventless hydrosilylation reaction with chloroplatinic ...

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Effective Formylation of Amines with Carbon Dioxide and Diphenylsilane Catalyzed by Chelating bis(tzNHC) Rhodium Complexes

20.06.2015 | Thanh V. Q. Nguyen, Woo‐Jin Yoo, Shū Kobayashi, Angewandte Chemie International Edition, 2015

Abstract The reductive formylation of amines using CO2 and hydrosilanes is an attractive method for incorporating CO2 into valuable organic compounds. However, previous systems required either high catalyst loadings or high temperatures to achieve high efficiency, and the substrate scope was ...

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Direct On‐Surface Patterning of a Crystalline Laminar Covalent Organic Framework Synthesized at Room Temperature

20.06.2015 | Alejandro de la Peña Ruigómez, David Rodríguez‐San‐Miguel, Kyriakos C. Stylianou, Massimiliano Cavallini, Denis Gent ..., Chemistry - A European Journal, 2015

Abstract We report herein an efficient, fast, and simple synthesis of an imine‐based covalent organic framework (COF) at room temperature (hereafter, RT‐COF‐1). RT‐COF‐1 shows a layered hexagonal structure exhibiting channels, is robust, and is porous to N2 and CO2. The room‐temperature ...

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Role of Fuel on Cation Disorder in Magnesium Aluminate (MgAl2O4) Spinel Prepared by Combustion Synthesis

19.06.2015 | Debasmita Dwibedi, Maxim Avdeev, Prabeer Barpanda, Journal of the American Ceramic Society, 2015

Magnesium aluminate spinel (MgAl2O4) forms an interesting system having tetrahedral and octahedral voids filled with near similar sized divalent Mg2+ and trivalent Al3+ cations. Structural disorder (e.g., Mg–Al antisite defects) can be tuned by synthetic conditions. This study reports the ...

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Stereoselective Synthesis of Chiral β-Fluoro α-Amino Acids via Pd(II)-Catalyzed Fluorination of Unactivated Methylene C(sp3)–H Bonds: Scope and Mechanistic Studies

19.06.2015 | Qi Zhang; Xue-Song Yin; Kai Chen; Shuo-Qing Zhang; Bing-Feng Shi, Journal of the American Chemical Society, 2015

The synthesis of fluorinated complex molecules via direct C(sp3)–H fluorination is attractive yet remains challenging. Here we describe the Pd(II)-catalyzed fluorination of unactivated methylene C(sp3)–H bonds by an inner-sphere mechanism. This method allows the site- and diastereoselective ...

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Selective Friedel–Crafts Acylation Reactions of 2-Arylphenoxyacetic Acids: A Simple and Efficient Methodology to Synthesize Dibenzoxepine and Arylcoumaranone Derivatives

19.06.2015 | Jialin Wang; Jiaqi Liu; Hao Lan; Wenyi Chu; Zhizhong Sun, Synthesis, 2015

SynthesisDOI: 10.1055/s-0034-1380211 Intramolecular Friedel–Crafts acylation reactions of 2-arylphenoxyacetic acids are accomplished using trifluoroacetic anhydride or trifluoromethanesulfonic acid at 0°C or room temperature. Depending on the reaction conditions, dibenzoxepines or ...

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Synthesis of NIR-Responsive NaYF4:Yb,Er Upconversion Fluorescent Nanoparticles Using an Optimized Solvothermal Method and Their Applications in Enhanced Development of Latent Fingerprints on Various Smooth Substrates

19.06.2015 | Meng Wang; Ye Zhu; Chuanbin Mao, Langmuir, 2015

Fingerprints at crime scenes are usually latent. The powder-dusting method is the most commonly used procedure for developing latent fingerprints in forensic science. However, the traditional powder-dusting method has characteristics of low sensitivity, low contrast, high background noise, and ...

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Phosphite as Polyanion-Based Cathode for Li-Ion Battery: Synthesis, Structure, and Electrochemistry of LiFe(HPO3)2

19.06.2015 | Hooman Yaghoobnejad Asl; Amitava Choudhury, Inorganic Chemistry, 2015

A new lithium containing iron(III) phosphite, LiFe(HPO3)2, has been synthesized via a solvent-free, low temperature, solid-state synthesis route. The crystal structure of this material has been determined employing single-crystal X-ray diffraction, which indicates that the compound has a ...

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