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3.087 Aktuelle Fachpublikationen zum Thema temperature

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Fluorine magic: one new organofluorine linker leads to three new metal–organic frameworks

17.12.2014 | K. Peikert; F. Hoffmann; M. Fröba, CrystEngComm, 2014

We present 2-fluoro-1,3,5-benzene-tricarboxylic acid (Fbtc) as new linker for metal–organic frameworks. Interestingly, even slight variations of the synthesis conditions such as temperature or the molar ratio of metal to linker lead to three new MOFs, which we call UHM-31, UHM-32 and UHM-33. ...

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Synergistic Effect between Defect Sites and Functional Groups on the Hydrolysis of Cellulose over Activated Carbon

12.12.2014 | Guo Shiou Foo, Carsten Sievers, ChemSusChem, 2014

Abstract The chemical oxidation of activated carbon by H2O2 and H2SO4 is investigated, structural and chemical modifications are characterized, and the materials are used as catalysts for the hydrolysis of cellulose. Treatment with H2O2 enlarges the pore size and imparts functional groups such ...

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Synthesis and Characterization of Sodium 5‐Chlorotetrazolate Dihydrate by Chlorination of 1H‐Tetrazole

12.12.2014 | Xiaojun Wang, Jiping Liu, Dong Wang, Xiaolu Bi, Wei Zhao, Zeitschrift für anorganische und allgemeine Chemie, 2014

Abstract A convenient, simple work‐up procedure and low‐cost chlorination method was developed to prepare sodium 5‐chlorotetrazolate dihydrate by chlorination of self‐prepared 1H‐tetrazole with sodium hypochlorite solution. Several organic extracting solvents and factors (raw material ratio, ...

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Polypropylene membranes with the double sensitivity effect

12.12.2014 | Joanna Wolska, Katarzyna Smolinska‐Kempisty, Marek Bryjak, Wojciech Kujawski, Journal of Applied Polymer Science, 2014

ABSTRACT This article describes the modification of polypropylene membranes leading to the preparation of thermo‐ and pH‐sensitive structures. Poly(N‐isopropylacrylamide), poly(acrylic acid), or copolymer poly(N‐isopropylacrylamide‐co‐acrylic acid) was grafted on to the membranes' surface ...

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Interactions of Saccharides in Aqueous Glycine and Leucine Solutions at Different Temperatures of (293.15 to 313.15) K: A Viscometric Study

12.12.2014 | Kuldeep Kumar; Baljeet Singh Patial; Suvarcha Chauhan, Journal of Chemical & Engineering Data, 2014

The results of viscosity measurements of ribose, maltose, and raffinose at molalities ranging from (0.050 to 0.100) mol·kg–1 in aqueous solutions of glycine and leucine of (0.025, 0.050, and 0.100) mol·kg–1, respectively, over a wide temperature range of (293.15 to 313.15) K, have been reported. ...

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Synthesis of Borophosphonate Cage Compounds: Influence of Substituent and Concentration Effects on Product Distribution in Condensation Reactions of Aryl Phosphonic Acids and Boronic Acids

12.12.2014 | Qian Liu; Nathan D. Contrella; Alexander S. Filatov; Richard F. Jordan, Organometallics, 2014

Aryl borophosphonate cage compounds [ArPO3BAr′]n with n = 4 or 6 were synthesized by condensation reactions of ArP(O)(OH)2 and Ar′B(OH)2. (3,5-tBu2-Ph)P(O)(OH)2 (1) reacts with arylboronic acids that contain electron-withdrawing substituents to form borophosphonate tetramers [Ar1PO3BAr2]4 (Ar1 = ...

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Heterometallic SrII‐MII (M=Co, Ni, Zn and Cu) Coordination Polymers: Synthesis, Temperature‐Dependent Structural Transformation, and Luminescent and Magnetic Properties

11.12.2014 | Yanmei Chen, Qian Gao, Wenqian Chen, Dandan Gao, Yahong Li, Wei Liu, Wu Li, Chemistry - An Asian Journal, 2014

Abstract The use of pyridine‐2,4‐dicarboxylic acid (H2pydc) in the construction of SrII and SrII‐MII (M=Co, Ni, Zn and Cu) coordination polymers is reported. Eight complexes, that is, [Sr(pydc)H2O]n (1), [MSr(pydc)2(H2O)2]n (M=Co (2), Ni (3), Zn (4)), [ZnSr(pydc)2(H2O)7]n⋅4 nH2O (5), ...

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Hypervalent Iodine Reagents Enable Chemoselective Deboronative/Decarboxylative Alkenylation by Photoredox Catalysis

11.12.2014 | Hanchu Huang, Kunfang Jia, Yiyun Chen, Angewandte Chemie International Edition, 2014

Abstract Chemoselective C(sp3)C(sp2) coupling reactions under mild reaction conditions are useful for synthesizing alkyl‐substituted alkenes having sensitive functional groups. Reported here is a visible‐light‐induced chemoselective alkenylation through a deboronation/decarboxylation sequence ...

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Hypervalent Iodine Reagents Enable Chemoselective Deboronative/Decarboxylative Alkenylation by Photoredox Catalysis

11.12.2014 | Hanchu Huang, Kunfang Jia, Yiyun Chen, Angewandte Chemie, 2014

Abstract Chemoselective C(sp3)C(sp2) coupling reactions under mild reaction conditions are useful for synthesizing alkyl‐substituted alkenes having sensitive functional groups. Reported here is a visible‐light‐induced chemoselective alkenylation through a deboronation/decarboxylation sequence ...

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Solid/Liquid Phase Diagram of the Ammonium Sulfate/Succinic Acid/Water System

11.12.2014 | Christian S. Pearson; Keith D. Beyer, Journal of Physical Chemistry A, 2014

We have studied the low-temperature phase diagram and water activities of the ammonium sulfate/succinic acid/water system using differential scanning calorimetry and infrared spectroscopy of thin films. Using the results from our experiments, we have mapped the solid/liquid ternary phase diagram, ...

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