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40.797 Aktuelle Fachpublikationen zum Thema temperature

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Lanthanide organic-inorganic hybrids based on functionalized metal-organic frameworks (MOFs) for near-UV white LED

22.10.2014 | Ye Lu; Bing Yan, Chemical Communication, 2014

A novel near-UV white LED based on lanthanide organic-inorganic hybrid material is realized through postsynthetic modified MOFs and MOF-based polymer. The hybrids materials have high quantum yield and satisfactory luminescent stability; the assembled white LED has tuneable correlated color ...

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Stability and structure of nanowires grown from silver, copper and their alloys by laser ablation into superfluid helium

22.10.2014 | Eugene B. Gordon; Alexander V. Karabulin; Vladimir I. Matyushenko; Vyacheslav D. Sizov; Igor I. Khodos, Physical Chemistry Chemical Physics, 2014

Nanowires with 5 nm diameter made of silver, copper, and their alloys were grown in superfluid helium. The silver nanowires being heated to 300K disintegrated into individual clusters. In contrast, copper nanowires were stable at room temperature, and nanowires made of alloys were also stable ...

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Assembly of Cd(II) Coordination Polymers: Structural Variation, Supramolecular Isomers, and Temperature/Anion-induced Solvent-mediated Structural Transformations

21.10.2014 | Shuang-Shuang Hou; Xuan Huang; Jun-Gu Guo; Shengrun Zheng; Jing Lei; Jing-Bo Tan; Jun Fan; Wei-Guang Zhang, CrystEngComm, 2014

The reactions of Cd(II) salts and 5-(3-(1H-imidazol-1-yl)phenyl)-1H-tetrazolate (3-HIPT) resulted to eight new coordination polymers (CPs), namely, {[Cd(3-IPT)2(H2O)2]•H2O}n (1 and 2), {[Cd(3-IPT)2(H2O)2]•2H2O}n (3), [Cd(3-IPT)(H2O)Cl]n (4), [Cd(3-IPT)Cl]n (5), [Cd(3-HIPT)I2]n (6), [Cd(3-IPT)I]n ...

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Green synthesis of peptide-templated fluorescent copper nanoclusters for temperature sensing and cellular imaging

21.10.2014 | Hong Huang; hua Li; Ai-Jun Wang; Shuxian zhong; Keming Fang; Jiu-Ju Feng, Analyst, 2014

A simple and green approach was developed for preparation of fluorescent Cu nanoclusters (NCs) using artificial peptide CLEDNN as a template. The as-synthesized Cu NCs exhibited high fluorescence quantum yield (7.3%) and good stability, along with excitation and temperature dependent fluorescent ...

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Hydration of alkynes at room temperature catalyzed by gold(I) isocyanide compounds

21.10.2014 | Yun Xu; Xingbang Hu; Jing Shao; Guoqiang Yang; Youting Wu; Zhibing Zhang, Green Chemistry, 2014

An effective method using gold(i) isocyanide complexes as catalysts for the transformation of various alkynes to the corresponding ketones is successfully developed. The hydration process proceeds smoothly at room temperature with quite high yield (up to 99%). The catalytic center is the ...

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Dehalogenation of functionalized alkyl halides in water at room temperature

21.10.2014 | Nicholas A. Isley; Matt S. Hageman; Bruce H. Lipshutz, Green Chemistry, 2014

Alkyl bromides and chlorides can be reduced to the corresponding hydrocarbons utilizing zinc in the presence of an amine additive. The process takes place in water at ambient temperatures, enabled by a commercially available designer surfactant. The reaction medium can be readily recycled, and ...

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Three-dimensional spider-web architecture assembled from Na2Ti3O7 nanotubes as a high performance anode for a sodium-ion battery

21.10.2014 | Yuping Zhang; Lin Guo; Shihe Yang, Chemical Communication, 2014

A Na2Ti3O7 nanotube-assembled three-dimensional spider-web architecture is synthesized using a hydrothermal method. The self-similar network architecture exhibits an excellent performance as an anode for a room temperature sodium ion battery without any additives (e.g. binder, conducting agent) ...

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Flexibility transition and guest-driven reconstruction in a ferroelastic metal–organic framework

21.10.2014 | Sarah J. Hunt; Matthew J. Cliffe; Joshua A. Hill; Andrew B. Cairns; Nicholas P. Funnell; Andrew L. Goodwin, CrystEngComm, 2014

The metal–organic framework copper(i) tricyanomethanide, Cu(tcm), undergoes a ferroelastic transition on cooling below Tf = 240 K. Thermal expansion measurements reveal an order-of-magnitude variation in framework flexibility across Tf. The low-temperature phase α-Cu(tcm) exhibits colossal ...

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The Direct Electrophilic Cyanation of [small beta]-Keto Esters and Amides with Cyano Benziodoxole

21.10.2014 | Yao-Feng Wang; Jiashen Qiu; Dejie Kong; Yongtao Gao; Feipeng Lu; Pran Gopal Karmaker; fuxue chen, Organic & Biomolecular Chemistry, 2014

The direct electrophilic α-cyanation of β-keto esters and amides has been developed using hypervalent iodine benziodoxole-derived cyano reagent. It accomplishes within 10 min without any catalyst in DMF at room temperature. Thus, the highly functionallized quaternary carbon-centered nitriles were ...

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Milestone in the NTB Phase Investigation and Beyond: Direct Insight into Molecular Self-Assembly

21.10.2014 | Trpimir Ivšiċ; Marijana Vinkoviċ; Ute Baumeister; Ana Mikleuševiċ; Andreja Lesac, Soft Matter, 2014

Although liquid-crystalline materials are most widely exploited for flat-panel, their ability to self-organize into periodically ordered nanostructures gives rise to a broad variety of additional applications. The recently discovered low-temperature nematic phase (NTB) with unusual ...

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