slideshow 16 slideshow 1 slideshow 2 slideshow 3 slideshow 4 slideshow 5 slideshow 6 slideshow 7 slideshow 8 slideshow 0 slideshow 9 slideshow 10 slideshow 11 slideshow 12 slideshow 13 slideshow 14 slideshow 15

Articles from Wiley

Condividi contenuti
The latest papers in ChemPubSoc Europe
Aggiornato: 6 ore 56 min fa

Noble Metal Supported on Activated Carbon for “Hydrogen Free” HDO Reactions: Exploring Economically Advantageous Routes for Biomass Valorisation

1 agosto, 2019 - 00:00

Hydrogen-free hydrodeoxygenation: This work showcases an economically appealing route for oxygenated bio-compounds upgrading via “H2-free” HDO reactions. We have applied noble metal based catalysts in the partial de-oxygenation of guaiacol as a model molecule in a high-pressure batch reactor in which water is used as hydrogen source. The activity of Ru/C catalyst is superior to other studied catalysts (i. e. Au/C, Pd/C and Rh/C) which is probably due to its greater dispersion and smaller metal particle size and also to the intrinsic activity of Ru for this process. Although still on an early stage we believe this route constitutes a promising approach to develop cost-effective processes for biomass valorisation.

[Full Papers]
Wei Jin, José Luis Santos, Dr. Laura Pastor-Perez, Prof. Sai Gu, Dr. Miguel Angel Centeno, Dr. Tomas Ramirez Reina
doi.org/10.1002/cctc.201900841

Organic Electrosynthesis

1 agosto, 2019 - 00:00

Organic electrosynthesis: Electrosynthesis is naturally a huge topic within the field of electrochemistry. Although it has an extensive history, it has recently seen a new era of growth and is now largely considered its own field rather than simply a subdiscipline. This Special Issue highlights the latest research in this exciting field.

[Editorial]
Dr. Robert Francke, Prof. R. Daniel Little, Prof. Shinsuke Inagi
doi.org/10.1002/celc.201901175

An Azo Coupling Strategy for Protein 3-Nitrotyrosine Derivatization

1 agosto, 2019 - 00:00

Fluorescence: An azo coupling strategy for the selective derivatization of 3-NT-containing proteins is presented. This strategy allows the specific introduction of a bioorthogonal group to 3-NT for the detection and enrichment of 3-NT-containing proteins, which facilitates the study of the functions of PTN under physiological and pathological conditions.

[Communications]
Yuxin Liu, Pengcheng Zhou, Honghong Da, Huiyi Jia, Feifei Bai, Guodong Hu, Dr. Baoxin Zhang, Prof. Jianguo Fang
doi.org/10.1002/chem.201901828

Access to Enantioenriched Spiro-<i>ϵ</i>-Lactam Oxindoles by an N-Heterocyclic Carbene-Catalyzed [4+3] Annulation of Flexible Oxotryptamines with Enals

1 agosto, 2019 - 00:00

Organocatalysis: Oxotryptamine was used as a flexible four-atom synthon in an NHC-catalyzed formal [4+3] annulation, providing an enantioselective method to access structurally diverse spiro-ϵ-lactam oxindoles with excellent enantioselectivities. This metal-free reaction features a broad substrate scope, excellent functional-group tolerance and proceeds under mild reaction conditions (see scheme).

[Communications]
Dehai Liu, Zhouli Hu, Yuxia Zhang, Minghua Gong, Prof. Dr. Zhenqian Fu, Prof. Dr. Wei Huang
doi.org/10.1002/chem.201903144

Co<sup>3+</sup>-Rich Na<sub>1.95</sub>CoP<sub>2</sub>O<sub>7</sub> Phosphates as Efficient Bifunctional Catalysts for Oxygen Evolution and Reduction Reactions in Alkaline Solution

1 agosto, 2019 - 00:00

Na-ion deficient Na2−xCoP2O7 phosphates are bifunctional catalysts for oxygen electrocatalysis and display outstanding electrocatalytic activity and durability in alkaline media. This study provides a promising low cost and efficient bifunctional alternative to precious metal catalysts for OER and ORR (see figure).

[Communications]
Dr. Liangqi Gui, Xiaoyun Miao, Chengjun Lei, Kailin Wang, Dr. Wei Zhou, Dr. Beibei He, Prof. Qing Wang, Dr. Ling Zhao
doi.org/10.1002/chem.201901848

Circularly Polarized Light Triggers Biosensing Based on Chiral Assemblies

1 agosto, 2019 - 00:00

Polarized light for biosensing: Chiral assemblies have attracted great interest because of their many potential applications, such as in chiral sensing, asymmetric catalysis, and optical devices. By using specific DNAzymes, a chiral core-satellite assembly consisting of a DNAzyme-driven spiny nanorod dimer core and upconversion nanoparticle (UCNP) satellite was constructed.

[Concepts]
Dr. Changlong Hao, Prof. Liguang Xu, Prof. Maozhong Sun, Hongyu Zhang, Prof. Hua Kuang, Prof. Chuanlai Xu
doi.org/10.1002/chem.201901721

The Minor Impurity in Spent Ores of the “Siberian Metal”: Ruthenium Turns 175

1 agosto, 2019 - 00:00

Happy birthday to Ru! The year 2019 is the 175th anniversary of the discovery of ruthenium by Karl Karlovich Klaus (1796-1864), Professor of Chemistry at Kazan University in Russia. From a relatively inconspicuous place among the platinum metals, it has become one of the most important transition metals in modern organic synthesis. The discovery of this element and its discoverer are discussed here.

[Essays]
Prof. Dr. David E. Lewis
doi.org/10.1002/chem.201901922

Tuning Chemical and Physical Properties of Phosphorus Corroles for Advanced Applications

1 agosto, 2019 - 00:00

Functionalization through axial ligand exchange: Remote functional groups were attached onto phosphorus corroles as to allow for their utility in advanced applications.

[Full Papers]
Qiu-Cheng Chen, Zi-Ye Xiao, Shachar Fite, Dr. Amir Mizrahi, Dr. Natalia Fridman, Xuan Zhan, Or Keisar, Dr. Yair Cohen, Prof. Dr. Zeev Gross
doi.org/10.1002/chem.201902686

Catalytic and Mechanistic Developments of the Nickel(II) Pincer Complex-Catalyzed Hydroarsination Reaction

1 agosto, 2019 - 00:00

Asymmetric C−As bond formation: Key catalytic steps were examined for the PCP NiII pincer complex-catalyzed asymmetric hydroarsination reaction. This was investigated with catalytic screening, DFT calculations, conductivity measurements and NMR spectroscopic studies. A unique Ni-Cl-As interaction was identified in the key catalytic intermediate which was not previously reported in other closely related hydrofunctionalization reactions (see scheme).

[Full Papers]
Wee Shan Tay, Dr. Yunpeng Lu, Dr. Xiang-Yuan Yang, Dr. Yongxin Li, Dr. Sumod A. Pullarkat, Prof. Pak-Hing Leung
doi.org/10.1002/chem.201902138

Direct Spectroscopic Detection of Key Intermediates and the Turnover Process in Catalytic H<sub>2</sub> Formation by a Biomimetic Diiron Catalyst

1 agosto, 2019 - 00:00

In the moment: Time-resolved IR spectroscopy provided structural and kinetic information on several intermediates in the catalytic cycle of a proton reduction catalyst (see figure). This allowed direct monitoring of the final, rate-determining step (RDS) of H−H formation, which provided a straightforward way to determine the turnover frequency.

[Full Papers]
Shihuai Wang, Dr. Sonja Pullen, Valentin Weippert, Dr. Tianfei Liu, Prof. Sascha Ott, Assoc. Prof. Reiner Lomoth, Prof. Leif Hammarström
doi.org/10.1002/chem.201902100

Sequential Assembly of Mutually Interactive Supramolecular Hydrogels and Fabrication of Multi-Domain Materials

1 agosto, 2019 - 00:00

Two-component self-sorting hydrogels: Combining two low-molecular-weight gelators enables the self-assembly and photo-fabrication of multi-domain gels in which different domains have different properties and functions.

[Full Papers]
Dr. Carmen C. Piras, Prof. Dr. David K. Smith
doi.org/10.1002/chem.201902158

Triptycene End-Capped Quinoxalinophenanthrophenazines (QPPs): Influence of Substituents and Conditions on Aggregation in the Solid State

1 agosto, 2019 - 00:00

Four structurally related triptycene end-capped quinoxalinophenanthrophenazines (QPPs) were synthesized and their optoelectronic properties were characterized. The directional robustness of the triptycene end-capping motif as crystal engineering synthon for QPPs was investigated by analysing overall 17 single-crystal structures. Finally, potential charge-transfer capabilities of the structures were calculated to identify promising candidates for organic field effect transistors.

[Full Papers]
Lucas Ueberricke, Daniel Holub, Julian Kranz, Dr. Frank Rominger, Prof. Dr. Marcus Elstner, Prof. Dr. Michael Mastalerz
doi.org/10.1002/chem.201902002

How Do Actinyls Interact with Hyperphosphorylated Yolk Protein Phosvitin?

1 agosto, 2019 - 00:00

Tracing species: Phosvitin is a model phosphorylated protein with an important role as an iron, calcium, and magnesium storage protein in egg yolk. A multitechnique spectroscopic investigation was performed to reveal the coordination mechanism of two oxocations of the actinide family (UVI, NpV) in speciation with phosvitin (see figure).

[Full Papers]
Dr. Sumit Kumar, Assist. Prof. Gaëlle Creff, Dr. Christoph Hennig, Dr. André Rossberg, Dr. Robin Steudtner, Dr. Johannes Raff, Dr. Claude Vidaud, Dr. François R. Oberhaensli, Dr. Marie-Yasmine Dechraoui Bottein, Prof. Christophe Den Auwer
doi.org/10.1002/chem.201902015

Competition Between Intra- and Intermolecular Hydrogen Bonding: <i>o</i>-Anisic Acid⋅⋅⋅Formic Acid Heterodimer

1 agosto, 2019 - 00:00

A complex arrangement: Contrary to the expected behavior for a carboxylic acid-acid complex, the most abundant form of o-anisic acid-formic acid complex has a trans COOH arrangement of o-anisic acid for which the intramolecular hydrogen bond dominates over intermolecular interactions (see figure).

[Full Papers]
Alberto Macario, Prof. Susana Blanco, Dr. Javix Thomas, Prof. Yunjie Xu, Prof. Juan Carlos López
doi.org/10.1002/chem.201902086

Beryllium-Induced Conversion of Aldehydes

1 agosto, 2019 - 00:00

Beryllium halides have been used to convert aldehydes into a wide variety of unprecedented products (see graphic; Be green, O red, halide white) and the outcome can be controlled. The reactivity of simple aldehydes towards beryllium halides (F, Cl, Br, I) was studied through solution and solid-state techniques. Rearrangement and aldol condensation reactions were observed and monitored by in situ NMR spectroscopy. Crystal structures of various products have been determined.

[Full Papers]
Matthias Müller, Magnus R. Buchner
doi.org/10.1002/chem.201902414

5-Methylcytosine is Oxidized to the Natural Metabolites of TET Enzymes by a Biomimetic Iron(IV)-Oxo Complex

1 agosto, 2019 - 00:00

The imitation game: Ten-eleven-translocation (TET) methyl cytosine dioxygenases play a key role in epigenetics by oxidizing the epigenetic marker 5-methyl cytosine (5mC) to 5-hydroxymethyl cytosine (5hmC), 5-formyl cytosine (5fC), and 5-carboxy cytosine (5cC). To understand discrepancies among the observed catalytic activity of TET enzymes and calculated bond dissociation energies of cytosine substrates, 5mC was oxidized by a biomimetic complex to the natural metabolites 5hmC, 5fC, and 5cC. Kinetic studies with deuterated substrates show a large kinetic isotope effect for both 5mC/d3-5mC and 5hmC/d2-5hmC, suggesting a hydrogen atom transfer as the rate-limiting step.

[Full Papers]
Niko S. W. Jonasson, Prof. Dr. Lena J. Daumann
doi.org/10.1002/chem.201902340

Heterojunction α-Fe<sub>2</sub>O<sub>3</sub>/ZnO Films with Enhanced Photocatalytic Properties Grown by Aerosol-Assisted Chemical Vapour Deposition

1 agosto, 2019 - 00:00

Heterojunction α-Fe2O3/ZnO films, grown using a simple aerosol-assisted CVD technique, showed enhanced photocatalytic activity. This was attributed to improved charge-carrier separation, with electron transfer across the type I heterojunction interface from ZnO into α-Fe2O3.

[Full Papers]
Dr. Arreerat Jiamprasertboon, Dr. Andreas Kafizas, Michael Sachs, Dr. Min Ling, Abdullah M. Alotaibi, Dr. Yao Lu, Prof. Theeranun Siritanon, Prof. Ivan P. Parkin, Prof. Claire J. Carmalt
doi.org/10.1002/chem.201902175

Dyads of G-Quadruplex Ligands Triggering DNA Damage Response and Tumour Cell Growth Inhibition at Subnanomolar Concentration

1 agosto, 2019 - 00:00

A cytotoxic hug: Naphthalene diimide (NDI) dyads exhibit remarkable cytotoxicity (<10 nM) on different cancer cell lines, which correlates to the length of the linker rather than the structure of the binding moieties (see figure).

[Full Papers]
Dr. Filippo Doria, Dr. Erica Salvati, Luca Pompili, Dr. Valentina Pirota, Carmen D'Angelo, Francesco Manoli, Dr. Matteo Nadai, Prof. Sara N. Richter, Dr. Annamaria Biroccio, Dr. Ilse Manet, Prof. Mauro Freccero
doi.org/10.1002/chem.201900766

Different Reactivity of Rutile and Anatase TiO<sub>2</sub> Nanoparticles: Synthesis and Surface States of Nanoparticles of Mixed-Valence Magnéli Oxides

1 agosto, 2019 - 00:00

Magnéli nanoparticles: A new route to nanoparticles of TinO2n−1 mixed-valence Magnéli phases with controlled size distribution combines a templating strategy with exploitation of the different reactivities of two TiO2 polymorphs. Synchrotron-radiation-based photoelectron spectroscopy revealed for the first time the surface reactivity of these carbon-free nanoparticles.

[Full Papers]
Dr. Elham Baktash, Dr. Jérôme Capitolis, Dr. Lionel Tinat, Dr. Clément Larquet, Dr. Tsou Hsi Camille Chan Chang, Dr. Jean-Jacques Gallet, Dr. Fabrice Bournel, Prof. Clément Sanchez, Dr. Sophie Carenco, Dr. David Portehault
doi.org/10.1002/chem.201901592

Nanoscopic Porous Iridium/Iridium Dioxide Superstructures (15 nm): Synthesis and Thermal Conversion by In Situ Transmission Electron Microscopy

1 agosto, 2019 - 00:00

Interior design: Porous particle superstructures consisting of iridium and iridium dioxide were prepared by reduction of sodium hexachloridoiridate. The three-dimensional organization of the primary nanoparticles inside the spherical superstructure is demonstrated by electron tomography. The highly porous particles have a pronounced catalytic activity in the oxygen evolution reaction.

[Full Papers]
Dr. Kevin Pappert, Dr. Kateryna Loza, Dr. Meital Shviro, Dr. Ulrich Hagemann, Dr. Marc Heggen, Prof. Dr. Rafal E. Dunin-Borkowski, Dr. Roland Schierholz, Dr. Takuya Maeda, Prof. Dr. Kenji Kaneko, Prof. Dr. Matthias Epple
doi.org/10.1002/chem.201901623

Copyright © 2012 Società Chimica Italiana. All Rights Reserved.