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Articles from Wiley

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The latest papers in ChemPubSoc Europe
Aggiornato: 8 settimane 3 giorni fa

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

Characterization and Reactivity of a Tetrahedral Copper(II) Alkylperoxido Complex

1 agosto, 2019 - 00:00

Double action: A CuII alkylperoxido complex exhibiting an unusual tetrahedral geometry has been prepared and characterized by several spectroscopic methods. The complex exhibits C−H and O−H bond activation reactivity towards 1,4-cyclohexadiene and phenol derivatives (see scheme). Mechanistic details are explored by kinetic analysis and DFT calculations, providing important insights into the reactivity of the bioinspired CuII peroxido complex.

[Full Papers]
Ikuma Shimizu, Dr. Yuma Morimoto, Dr. Gunasekaran Velmurugan, Dr. Tulika Gupta, Dr. Sayantan Paria, Dr. Takehiro Ohta, Dr. Hideki Sugimoto, Prof. Takashi Ogura, Prof. Peter Comba, Prof. Shinobu Itoh
doi.org/10.1002/chem.201902669

Allosteric Modulators of Potential Targets Related to Alzheimer's Disease: a Review

1 agosto, 2019 - 00:00

Targeting the other: The search for allosteric modulators of biological targets related to Alzheimer′s disease (AD) is a key strategy in current approaches to develop drug candidates for the treatment of AD. The purpose of this review is to provide an overview of compounds that act as allosteric modulators of the main biological targets related to AD.

[Reviews]
Guilherme Martins Silva, Mariana Pegrucci Barcelos, João Gabriel Curtolo Poiani, Prof. Dr. Lorane Izabel da Silva Hage-Melim, Prof. Dr. Carlos Henrique Tomich de Paula da Silva
doi.org/10.1002/cmdc.201900299

Biomimetic Extreme-Temperature- and Environment-Adaptable Hydrogels

1 agosto, 2019 - 00:00

Temperature-resistant hydrogels that can withstand cold and arid environments without degradation of their properties can be fabricated by a variety of strategies. Here, recent fabrication routes for anti-freezing, non-drying hydrogels are reviewed. The merits and drawbacks of the materials are discussed and possible applications in flexible electronics are highlighted. The authors also point out future challenges to elucidate the great potential of this juvenile research area.

[Reviews]
Dan Zhou, Fan Chen, Prof. Dr. Stephan Handschuh-Wang, Dr. Tiansheng Gan, Prof. Dr. Xiaohu Zhou, Prof. Dr. Xuechang Zhou
doi.org/10.1002/cphc.201900545

Understanding the Oxygen Reduction Reaction Activity and Oxidative Stability of Pt Supported on Nb-Doped TiO<sub>2</sub>

1 agosto, 2019 - 00:00

“Pt/NTO is shown to exhibit significantly greater activity than the benchmark Pt/C catalysts…” This and more about the story behind the research that inspired the Cover image is presented in the Cover Profile. Read the full text of the corresponding research at 10.1002/cssc.201900499. View the Front Cover here: 10.1002/cssc.201902005.

[Cover Profile]
Cheng He, Dr. Shrihari Sankarasubramanian, Dr. Ivana Matanovic, Prof. Plamen Atanassov, Prof. Vijay Ramani
doi.org/10.1002/cssc.201902006

Transformation of Levulinic Acid to Valeric Biofuels: A Review on Heterogeneous Bifunctional Catalytic Systems

1 agosto, 2019 - 00:00

Upgrading acids: The cascade transformation of levulinic acid to valeric biofuels consists of a series of acid- and metal-catalyzed processes alternately. Herein, the conversion pathway and bifunctional catalytic systems for the cascade transformation and one-pot processes are reviewed. Additionally, effects of active sites and coke deposition on the catalytic performance are also discussed to seek strategies for improvement.

[Minireviews]
Zhihao Yu, Dr. Xuebin Lu, Jian Xiong, Dr. Na Ji
doi.org/10.1002/cssc.201901522

Preparation of Zn(Fe<i><sub>x</sub></i>Ga<sub>1-<i>x</i></sub>)<sub>2</sub>O<sub>4</sub> Solid Solutions as Photocatalyst for CO<sub>2</sub> Reduction under Simulated Solar-Light Irradiation

1 agosto, 2019 - 00:00

We report the first study on Zn(FexGa1-x)2O4 for CO2 photoreduction driven by simulated solar-light irradiation. The Valence band top and conduction band bottom of Zn(FexGa1-x)2O4 could be adjusted by the doping amount of Fe3+. ZnFe0.1Ga1.9O4 has the optimum Fe3+ content that ensures maximum photocatalytic capability under solar-light irradiation.

[Communications]
Qiaoqi Li, Lili Zhang, Chao Tang, Jingzhou Yin
doi.org/10.1002/ejic.201900468

Formation of 10/12/14-Membered Rings is Favored over 5/6/7-Membered. An Unexpected Result from Oxazole Chemistry

1 agosto, 2019 - 00:00

Base-promoted cyclization of N-Boc-(4-(chloromethyl)oxazol-5-yl)alkylamines results in preferable formation of fused 10-, 12-, and 14-membered rings over the corresponding 5-, 6-, and 7-membered ones.

[Communications]
Evgeniy Y. Slobodyanyuk, Yulia L. Berezowska, Vitaliy V. Solomin, Dmitriy M. Volochnyuk, Alexander B. Rozhenko, Sergey V. Ryabukhin, Oleksandr O. Grygorenko
doi.org/10.1002/ejoc.201900914

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