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5.251 Aktuelle Fachpublikationen zum Thema temperature

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Abnormal Room Temperature Ferromagnetism in CuO/ZnO Heterostructures: Interface Related or Not?

18.11.2014 | daqiang gao; zhipeng zhang; you li; Baorui xia; shoupeng shi; desheng xue, Chemical Communication, 2014

Recent technical advances in synthesis of oxide heterostructures have provided a fertile ground for creating novel states at their interfaces. Contrary to the paramagnetism CuO or ZnO, CuO/ZnO heterostructures show clear ferromagnetism which is proportional to the interface counts, providing the ...

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The Paal–Knorr reaction revisited. A catalyst and solvent-free synthesis of underivatized and N-substituted pyrroles

18.11.2014 | Hyejin Cho; Richard Madden; Bilal Nisanci; Béla Török, Green Chemistry, 2014

A new, modified synthesis of pyrroles is described. The reaction of 2,5-hexandione with a variety of amines yielded the expected pyrrole analogues in excellent yields. The reactions were carried out under the ultimate green conditions excluding both catalyst and solvent applying simple stirring ...

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Room‐Temperature Synthesis of Cu2−xE (E=S, Se) Nanotubes with Hierarchical Architecture as High‐Performance Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

14.11.2014 | Xin Qi Chen, Zhen Li, Yang Bai, Qiao Sun, Lian Zhou Wang, Shi Xue Dou, Chemistry - A European Journal, 2014

Abstract Copper chalcogenide nanostructures (e.g. one‐ dimensional nanotubes) have been the focus of interest because of their unique properties and great potential in various applications. Their current fabrications mainly rely on high‐temperature or complicated processes. Here, with the ...

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Nanopatterned Superlattices in Self‐Assembled C2‐Symmetric Oligodimethylsiloxane‐Based Benzene‐1,3,5‐Tricarboxamides

14.11.2014 | Miguel García‐Iglesias, Bas F. M. de Waal, Isja de Feijter, Anja R. A. Palmans, E. W. Meijer, Chemistry - A European Journal, 2014

Abstract The synthesis of C3‐ and C2‐symmetric benzene‐1,3,5‐tricarboxamides (BTAs) containing well‐defined oligodimethylsiloxane (oDMS) and/or alkyl side chains has been carried out. The influence of the bulkiness of the oDMS chains in the aggregation behavior of dilute solutions of the ...

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Synthesis of Single‐phase β‐Yb2Si2O7 and Properties of Its Sintered Bulk

14.11.2014 | Shu‐Bin Wang, Yan‐Ru Lu, Yan‐Xia Chen, International Journal of Applied Ceramic Technology, 2014

Single‐phase β‐Yb2Si2O7 was synthesized by solid‐state reaction using Yb2O3 and SiO2 gel. SiO2 gel significantly decreased the synthesis temperature and shortened the holding time. Bulk Yb2Si2O7 was obtained by pressureless sintering. Grain size, relative density (92.9%), and flexural strength ...

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Synthesis of Low-Valent Nickel Complexes in Aqueous Media, Mechanistic Insights, and Selected Applications

14.11.2014 | Illán Morales-Becerril; Marcos Flores-Álamo; Adrián Tlahuext-Aca; Alma Arévalo; Juventino J. García, Organometallics, 2014

The synthesis of nickel(0) complexes usually requires the employment of strong reducing agents, including powerful hydride donors such as LiHBEt3, LiAlH4, and DIBAL-H. Herein, we have reduced the Ni(II) complex [(dippe)NiCl2] (1a) at room temperature by using KOH in aqueous media to yield the ...

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Asymmetric Alkynylation of Seven-Membered Cyclic Imines by Combining Chiral Phosphoric Acids and Ag(I) Catalysts: Synthesis of 11-Substituted-10,11-dihydrodibenzo[b,f][1,4]oxazepine Derivatives

14.11.2014 | Yuan-Yuan Ren; You-Qing Wang; Shuang Liu, The Journal of Organic Chemistry, 2014

Asymmetric alkynylation of seven-membered cyclic imine dibenzo[b,f][1,4]oxazepines is successfully achieved by combining chiral phosphoric acid and Ag(I) catalysts. Various arylacetylenes, conjugated enynes, and terminal 1,3-diynes are good substrates for this reaction, and aliphatic hexyne is ...

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A Regioselective Synthesis of Benzopinacolones through Aerobic Dehydrogenative α‐Arylation of the Tertiary sp3 CH Bond of 1,1‐Diphenylketones with Aromatic and Heteroaromatic Compounds

13.11.2014 | Nagnath Yadav More, Masilamani Jeganmohan, Chemistry - A European Journal, 2014

Abstract A regioselective synthesis of symmetrical and unsymmetrical benzopinacolones through aerobic dehydrogenative α‐arylation at the tertiary sp3 CH bond of substituted 1,1‐diphenylketones with aromatic and heteroaromatic compounds, in the presence of K2S2O8 in CF3COOH at room ...

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Tuning the Morphology of GeS2 Hybrid Materials Using Ionic Liquids as Structuring Agents

13.11.2014 | Romain Mathiaud, Laurence Courthéoux, Gilles Silly, Hashim Albadri, Jocelyne Levillain, Annie‐Claude Gaumont, Michel ..., European Journal of Inorganic Chemistry, 2014

Abstract Control of the surface chemistry and morphology of chalcogenide materials, which are highly polarizable, is a very interesting challenge as it might lead to breakthroughs in various fields such as electrochemistry, catalysis, and gas‐phase separation. With this in mind, a new approach ...

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ChemInform Abstract: Stereoselective Synthesis of α‐(Dichloromethyl)amines, α‐(Chloromethyl)amines, and α‐Chloroaziridines.

13.11.2014 | Desheng Li, Ya Li, Zhiqiu Chen, Huaqi Shang, Hongsen Li, Xinfeng Ren, ChemInform, 2014

Abstract The diastereoselective reaction of aldimines (I) with silane (II) at low temperature give α‐(dichloromethyl)amines (III) whereas aziridines (IV) are obtained when the reaction mixture is warmed up to room temperature.

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