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Articles from Wiley

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The latest chemistry from ChemPubSoc Europe and Wiley-VCH
Aggiornato: 10 settimane 6 giorni fa

Size-Dependent Activity of Palladium Nanoparticles: Efficient Conversion of CO<sub>2</sub> into Formate at Low Overpotentials

14 marzo, 2017 - 01:00

 Efficient Conversion of CO2 into Formate at Low Overpotentials

Smaller isn't better: The size-dependent activity of palladium nanoparticles (PdNPs) towards formate production has been studied at low overpotentials for NPs with sizes of 3.8–10.7 nm. A maximum of 98 % in the formate efficiency was observed for the 6.5 nm PdNPs. The size dependency of the formate efficiency is related to the counterbalancing effects of a competing CO2 reduction reaction and a parasitic hydrogen evolution reaction.

[Full Paper]
Motiar Rahaman, Abhijit Dutta, Peter Broekmann
ChemSusChem, March 14, 2017, https://doi.org/10.1002/cssc.201601778 Read article

Electrochemical Reduction of Oxygen in Aprotic Ionic Liquids Containing Metal Cations: A Case Study on the Na–O<sub>2</sub> system

14 marzo, 2017 - 01:00

 A Case Study on the Na–O2 system

The softer the better: The oxygen reduction reaction (ORR) in an aprotic ionic liquid is found to be governed by the Lewis acidity of metal cations. Soft cations catalyze the ORR at less negative onset potentials, whereas hard cations hamper the ORR and result in more negative onset potentials. These findings are relevant to designing advanced electrolytes for high-performance metal–air batteries.

[Full Paper]
Eneko Azaceta, Lukas Lutz, Alexis Grimaud, Jose Manuel Vicent-Luna, Said Hamad, Luis Yate, German Cabañero, Hans-Jurgen Grande, Juan A. Anta, Jean-Marie Tarascon, Ramon Tena-Zaera
ChemSusChem, March 14, 2017, https://doi.org/10.1002/cssc.201601464 Read article

A Density Functional Theory Investigation of Ni<sub><i>n</i></sub>, Pd<sub><i>n</i></sub>, and Pt<sub><i>n</i></sub> Clusters (<i>n</i>=1–4) Adsorbed on Buckminsterfullerene

14 marzo, 2017 - 01:00

A Density Functional Theory Investigation of Nin, Pdn, and Ptn Clusters (n=1–4) Adsorbed on Buckminsterfullerene

Clusters on Bucky balls: How Ni, Pd, and Pt clusters adsorb on C60 is examined by using a computational approach. The calculations show that the base structure of C60 can host Nin/Pdn/Ptn (n=1–4) clusters with good adsorption stability and the complexes establish either two or no unpaired electrons. The binding energy of Pd and Pt clusters increases as the number of metal atom increases, which implies that the coverage of C60 with Pd or Pt preferentially establishes a large-size metal cluster.

[Article]
Nguyet N. T. Pham, Hung M. Le
ChemPhysChem, March 14, 2017, https://doi.org/10.1002/cphc.201601374 Read article

Double-Strand Breaks in Genome-Sized DNA Caused by Ultrasound

14 marzo, 2017 - 01:00

Double‐Strand Breaks in Genome‐Sized DNA Caused by Ultrasound

DNA damage: Double-strand breaks (DSBs) induced by ultrasound sonication are quantitatively evaluated by single-molecule observation. High-frequency pulsing induced greater damage than continuous-wave sonication and low-frequency pulsing caused less damage, as illustrated in the log–log plot between the number of pulses, Np, and the number of DSBs, <n>.

[Article]
Rinko Kubota, Yusuke Yamashita, Takahiro Kenmotsu, Yuko Yoshikawa, Kenji Yoshida, Yoshiaki Watanabe, Tadayuki Imanaka, Kenichi Yoshikawa
ChemPhysChem, March 14, 2017, https://doi.org/10.1002/cphc.201601325 Read article

A New Type of Scaling Relations to Assess the Accuracy of Computational Predictions of Catalytic Activities Applied to the Oxygen Evolution Reaction

14 marzo, 2017 - 01:00

A New Type of Scaling Relations to Assess the Accuracy of Computational Predictions of Catalytic Activities Applied to the Oxygen Evolution Reaction

Finding good catalysis gOERs The most widespread computational method used to predict oxygen evolution activities of oxide catalysts does not predict RuO2 to be active at the GGA level. The origin of this anomaly is detected using a new type of scaling relations. Besides, the problem is mitigated using explicit solvation and functionals that account for van der Waals interactions.

[Full Paper]
Ludovic G. V. Briquet, Misbah Sarwar, Jane Mugo, Glenn Jones, Federico Calle-Vallejo
ChemCatChem, March 14, 2017, https://doi.org/10.1002/cctc.201601662 Read article

σ-Alkyl-Pd<sup>II</sup> Species for Remote C−H Functionalization

14 marzo, 2017 - 01:00

&#x3C3;‐Alkyl‐PdII Species for Remote C−H Functionalization

Remote Destination: Substitution of C−H bonds at positions previously inaccessible are now performed via an &#x3C3;-alkyl-PdII species. A specially designed substrate directs the carbopalladated species resulting from intramolecular cyclization towards C−H activation at remote position.

[Concept]
Vaibhav P. Mehta, José-Antonio García-López
ChemCatChem, March 14, 2017, https://doi.org/10.1002/cctc.201601624 Read article

Friedel–Crafts Alkylation of Indoles with Nitroalkenes through Hydrogen-Bond-Donating Metal–Organic Framework

14 marzo, 2017 - 01:00

Friedel–Crafts Alkylation of Indoles with Nitroalkenes through Hydrogen‐Bond‐Donating Metal–Organic Framework

Just passing through: The use of a new porous urea-containing metal–organic framework (MOF) that acts as a hydrogen-bond-donating catalyst (HBD) for Friedel–Crafts reactions is explored. Structural arrangement of this MOF creates a porous environment with spatial isolation of the urea moiety, which can potentially solve the problem of self-recognition and aggregation of the urea derivative during the catalytic process.

[Communication]
Purna Chandra Rao, Sukhendu Mandal
ChemCatChem, March 14, 2017, https://doi.org/10.1002/cctc.201601583 Read article

Oxidative Esterification of Methacrolein to Methyl Methacrylate over Gold Nanoparticles on Hydroxyapatite

14 marzo, 2017 - 01:00

Oxidative Esterification of Methacrolein to Methyl Methacrylate over Gold Nanoparticles on Hydroxyapatite

Hip HAP: Three nanocatalysts of Au supported on needle-like, lamella-like, and rodlike hydroxyapatite (N-HAP, L-HAP, and R-HAP) are employed in the direct oxidative esterification of methacrolein to produce methyl methacrylate. N-HAP-supported Au has the best catalytic performance because of surface cooperative effects between the abundant acid–base sites for the preferential chemisorption of methacrolein and highly dispersed active Au species for the favorable formation of &#x3B2;-hydride and oxygen activation.

[Full Paper]
Jun Gao, Guoli Fan, Lan Yang, Xinzhong Cao, Peng Zhang, Feng Li
ChemCatChem, March 14, 2017, https://doi.org/10.1002/cctc.201601560 Read article

Direct Intracellular Delivery of Cell-Impermeable Probes of Protein Glycosylation by Using Nanostraws

14 marzo, 2017 - 01:00

Direct Intracellular Delivery of Cell‐Impermeable Probes of Protein Glycosylation by Using Nanostraws

Azidosugar interjection: Substrates for protein glycosylation were directly delivered into the cell cytoplasm through nanoscale conduits on a nanostraw platform. This technique can be used to introduce bulky, charged, and cell-impermeable azidosugar substrates and reaction intermediates into the glycosylation pathway for subsequent labeling with click chemistry probes.

[Communication]
Alexander M. Xu, Derek S. Wang, Peyton Shieh, Yuhong Cao, Nicholas A. Melosh
ChemBioChem, March 14, 2017, https://doi.org/10.1002/cbic.201600689 Read article

Identifying Unknown Enzyme–Substrate Pairs from the Cellular Milieu with Native Mass Spectrometry

14 marzo, 2017 - 01:00

Identifying Unknown Enzyme–Substrate Pairs from the Cellular Milieu with Native Mass Spectrometry

Feeling IsoLAITed: Isotope-labeled, activity-based identification and tracking (IsoLAIT) is a framework designed to identify enzyme–substrate pairs from complex matrices. By replacing a common enzyme substrate with an isotope-labeled, activity-based probe, detection of the [enzymesubstrateprobe] complex by native mass spectrometry is rendered facile, even if the components are of unknown chemical nature and mass.

[Communication]
Kalli C. Catcott, Jing Yan, Wanlu Qu, Vicki H. Wysocki, Zhaohui Sunny Zhou
ChemBioChem, March 14, 2017, https://doi.org/10.1002/cbic.201600634 Read article

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