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26,069 Newest Publications about the topic hydrogen

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t‐Boc synthesis of Huwentoxin‐I through Native Chemical Ligation incorporating a Trifluoromethanesulfonic acid cleavage strategy

07-Jun-2016 | Parashar Thapa, Chino C. Cabalteja, Edwin E. Philips, Michael J. Espiritu, Steve Peigneur, Bea G. Mille, Jan Tytgat, ..., Peptide Science, 2016

Abstract Tert‐butyloxycarbonyl (t‐Boc) based Native Chemical Ligation (NCL) techniques commonly employ hydrogen fluoride (HF) to create the thioester fragment required for the ligation process. Our research aimed to assess the replacement of HF with Trifluoromethanesulfonic acid (TFMSA). Here ...

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Comparing the strength of covalent bonds, intermolecular hydrogen bonds and other intermolecular interactions for organic molecules. X-ray diffraction data and quantum chemical calculations

07-Jun-2016 | Angelo Gavezzotti, New Journal of Chemistry, 2016

For each of the binding categories in the title, a survey of bond length data is made using the crystallographic information in the Cambridge Structural Database, yielding average values with standard deviations. For typical samples of each category, bond stretching energy curves are calculated ...

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Catalytic transfer hydrogenation of azobenzene by low-valent nickel complexes: a route to 1,2-disubstituted benzimidazoles and 2,4,5-trisubstituted imidazolines

07-Jun-2016 | Daniel A. Zurita; Marcos Flores-Alamo; Juventino J. García, Dalton Transactions, 2016

The one-pot synthesis of 1,2-disubstituted benzimidazoles by the transfer hydrogenation of azobenzene, using benzylamine as a hydrogen donor, sequential rearrangement of hydrazobenzene to semidine and further condensation with N-benzylideneamine is reported, catalyzed by 2 mol% of [Ni(COD)2] [ ] ...

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Energetic Aminated-azole Assemblies from Intramolecular and Intermolecular N-H…O and N-H…N Hydrogen Bonds

07-Jun-2016 | J M Shreeve; Chunlin He; Ping Yin; Lauren A. Mitchell; Damon A. Parrish, Chemical Communication, 2016

Compounds with adjacent C-NO2, C-NH2 and N-NH2 groups were designed and synthesized via amination. Their structures were characterized by infrared, and multinuclear NMR spectroscopy, elemental analysis, and X-ray single crystal diffraction. The effect of intramolecular and intermolecular N-H…O ...

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Activated Carbon Becomes Active for Oxygen Reduction and Hydrogen Evolution Reactions

07-Jun-2016 | Xuecheng Yan; Yi Alec Jia; Taiwo Odedairo; Xiaojun Zhao; Zhao Jin; Zhonghua Zhu; Xiangdong Yao, Chemical Communication, 2016

We utilized a facile method created unique defects in the activated carbon (AC), which makes it highly active for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). The ORR activity of the defective AC (D-AC) is comparable to the commercial Pt/C in alkaline medium, and the ...

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Resolving the Physical Origin of Octahedral Tilting in Halide Perovskites

07-Jun-2016 | Jung-Hoon Lee; Nicholas C. Bristowe; June Ho Lee; Sung-Hoon Lee; Paul D. Bristowe; Anthony K. Cheetham; Hyun Myung Jang, Chemistry of Materials, 2016

Hybrid perovskites are currently the fastest growing photovoltaic technology, having reached a solar cell efficiency of over 20%. One possible strategy to further improve the efficiency of perovskite solar cells is to tune the degree of octahedral tilting of the halide frame, since this in turn ...

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Crystalline Metaphosphate Acid Salts: Synthesis in Organic Media, Structures, Hydrogen-Bonding Capability, and Implication of Superacidity

07-Jun-2016 | Khetpakorn Chakarawet; Ioana Knopf; Matthew Nava; Yanfeng Jiang; Julia M. Stauber; Christopher C. Cummins, Inorganic Chemistry, 2016

Metaphosphate acids cannot be thoroughly studied in aqueous media because their acidity is leveled by the solvent, and the resulting metaphosphates are susceptible to acid-catalyzed hydrolysis. Exploration of metaphosphate acid chemistry has now been made possible with the development of a ...

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Intramolecular, Exciplex-Mediated, Proton-Coupled, Charge-Transfer Processes in N,N-Dimethyl-3-(1-pyrenyl)propan-1-ammonium Cations: Influence of Anion, Solvent Polarity, and Temperature

07-Jun-2016 | Trevor M. Safko; Marcelo M. Faleiros; Teresa D. Z. Atvars; Richard G. Weiss, Journal of Physical Chemistry A, 2016

An intramolecular exciplex-mediated, proton-coupled, charge-transfer (PCCT) process has been investigated for a series of N,N-dimethyl-3-(1-pyrenyl)propan-1-ammonium cations with different anions (PyS) in solvents of low to intermediate polarity over a wide temperature range. Solvent mediates ...

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Proton-hydride tautomerism in hydrogen evolution catalysis [Chemistry]

07-Jun-2016 | Luis M. Aguirre Quintana; Samantha I. Johnson; Sydney L. Corona; Walther Villatoro; William A. Goddard III; Michael ..., Proceedings of the National Academy of Sciences current issue, 2016

Efficient generation of hydrogen from renewable resources requires development of catalysts that avoid deep wells and high barriers. Information about the energy landscape for H2 production can be obtained by chemical characterization of catalytic intermediates, but few have been observed to ...

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Sensors, Vol. 16, Pages 839: High Sensitivity pH Sensor Based on Porous Silicon (PSi) Extended Gate Field-Effect Transistor

07-Jun-2016 | Al-Hardan, Naif H.; Abdul Hamid, Muhammad Azmi; Ahmed, Naser M.; Jalar, Azman ; Shamsudin, Roslinda ; Othman, Norins ..., Sensors, 2016

In this study, porous silicon (PSi) was prepared and tested as an extended gate field-effect transistor (EGFET) for pH sensing. The prepared PSi has pore sizes in the range of 500 to 750 nm with a depth of approximately 42 µm. The results of testing PSi for hydrogen ion sensing in different pH ...

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