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44.504 Aktuelle Fachpublikationen zum Thema temperature

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Decarboxylation and simultaneous reduction of silver(I) [German sz ligature}-ketocarboxylates with three types of coordination

16.04.2015 | Mariko Hatamura; Shunro Yamaguchi; Shin-ya Takane; Yu Chen; Katsuaki Suganuma, Dalton Transactions, 2015

A series of silver(I) ß-ketocarboxylates were prepared by reaction of ß-ketocarboxylic acids with silver nitrate in the presence of diethanolamine. The silver(I) ß-ketocarboxylates decomposed over a narrow temperature range to form metallic silver, CO2, and the corresponding ketones. In addition, ...

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Thermo-Chemical Hydrogen Production Technology from Biomass

16.04.2015 | Lu, Baowang; Kawamoto, Katsuya, Organic Chemistry, 2015

Abstract: As one of the few long-term sustainable clean energy carriers, hydrogen (H2) has attracted a great deal of attention. It has been projected as the most promising source of energy with less pollution on environment, especially without CO2 emission. Biomass as a neutral carbon source is ...

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Dielectric and Raman investigations of structural phase transitions in (C2H5NH3)2CdCl4

16.04.2015 | Ruchika Yadav; Diptikanta Swain; Partha Kundu; Harikrishnan S. Nair; Chandrabhas Narayana; Suja Elizabeth, Physical Chemistry Chemical Physics, 2015

Temperature-dependent Raman and dielectric measurements have been carried out on (C2H5NH3)2CdCl4 single crystals. Raman studies reveal presence of two structural phase transitions below room temperature at 216 K and 114 K. The phase transitions are marked by anomalies in temperature dependence of ...

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Parallel mechanisms of polypyrrole self-discharge in aqueous media

16.04.2015 | H. Olsson; Z. Qiu; M. Strømme; M. Sjödin, Physical Chemistry Chemical Physics, 2015

In this report we investigate the self-discharge in a positively charged polypyrrole–cellulose composite material in water solution. Rate constants for the self-discharge reaction are determined by potential step methods and their dependence on pH, temperature and applied potential are reported. ...

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Helical alignment inversion of microtubules in accordance with a structural change in their lattice

15.04.2015 | Kazuhiro Shikinaka; Saori Mori; Kiyotaka Shigehara; Hiroyasu Masunaga, Soft Matter, 2015

Giant helical (oriented chiral nematic) alignments of microtubules of nanometer to centimeter lengths are known to form over a temperature gradient during anisotropic spiral propagation via tubulin dimer addition in a capillary cell. Such helical alignments may be modified by the addition of ...

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Influence of the interface in quantum corrections to low-temperature resistance of La2/3Sr1/3MnO3 trilayer masking thin films

15.04.2015 | Yuan Jin; Xiaopeng Cui; Weihua Han; Shixun Cao; Yuze Gao; Jincang Zhang, Physical Chemistry Chemical Physics, 2015

We report the low-temperature resistance upturn in sandwiched structures of La2/3Sr1/3MnO3/ZrO2/La2/3Sr1/3MnO3, La2/3Sr1/3MnO3/LaMnO3/La2/3Sr1/3MnO3, while it disappeared when the interlayer was replaced by YBa2Cu3O7. The experimental data have been analyzed qualitatively and quantitatively. The ...

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Sodium Benzenesulfinates: Novel and Effective Organo Catalyst for Three Component Synthesis 5,6,7,8-Tetrahydro-4H-chromene Derivatives Under Ultrasound Irradiation

15.04.2015 | Abaszadeh, Mehdi; Seifi, Mohammad, Letters in Organic Chemistry, 2015

Abstract: Sodium benzenesulfinates, as a new organo catalyst, can be used to synthesize tetrahydro- 4H-chromene derivatives by three component reaction of cyclic β-dicarbonyl compounds, malononitrile, and aromatic aldehydes, in H2O/EtOH, under ultrasound irradiation at room temperature. ...

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Regioselective sulfamoylation at low temperature enables concise syntheses of putative small molecule inhibitors of sulfatases

15.04.2015 | Duncan C. Miller; Benoit Carbain; Gary S. Beale; Sari F. Alhasan; Helen L. Reeves; Ulrich Baisch; David R. Newell; B ..., Organic & Biomolecular Chemistry, 2015

Regioselective sulfamoylation of primary hydroxyl groups enabled a 5-step synthesis (overall yield 17%) of the first reported small molecule inhibitor of sulfatase-1 and 2, ((2S,3R,4R,5S,6R)-4,5-dihydroxy-2-methoxy-6-((sulfamoyloxy)methyl)tetrahydro-2H-pyran-3-yl)sulfamic acid, which obviated the ...

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Stereoselective synthesis and reaction of gold(I) (Z)-enethiolates

15.04.2015 | Kazunori Miyamoto; Masaya Hirobe; Masanobu Uchiyama; Masahito Ochiai, Chemical Communication, 2015

Bench-top-storable (Z)-enethiol reagents: gold (Z)-1-decenylthiolates were synthesized stereoselectively in high yields. They are stable upon storage at room temperature without protection from light, and react smoothly with various alkyl halides, α,β-unsaturated ketones, and electron-deficient ...

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A new cooling plus heating mode of liquid phase epitaxy and its application for the oriented film growth

15.04.2015 | L. S. Guo; Y. Y. Chen; X. Yao, CrystEngComm, 2015

Using liquid phase epitaxy (LPE), we developed a new approach to growing a-axis oriented YBa2Cu3O7−δ films (a-films) in air, which have been hard to gain in the prior art since an extremely low supersaturation (σ) is required for their formation. Instead of the conventional step-cooling from a ...

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