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Articles from Wiley

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The latest chemistry from ChemPubSoc Europe and Wiley-VCH
Updated: 6 weeks 2 days ago

Strongly Reducing, Visible-Light Organic Photoredox Catalysts as Sustainable Alternatives to Precious Metals

1 August, 2017 - 00:00

Strongly Reducing, Visible‐Light Organic Photoredox Catalysts as Sustainable Alternatives to Precious Metals

The new iridium! The photophysical and electrochemical properties of a strongly reducing dihydrophenazine and phenoxazine enable their application as visible light photoredox catalysts to catalyze reactions that were previously restricted to precious metals. These organic visible light photoredox catalysts not only present sustainable alternatives to precious metals, but can possess enhanced properties to their metal counterparts for catalysis (see scheme).

[Communication]
Ya Du, Ryan M. Pearson, Chern-Hooi Lim, Steven M. Sartor, Matthew D. Ryan, Haishen Yang, Niels H. Damrauer, Garret M. Miyake
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702926 Read article

Loops and Cycles at Surfaces: The Unique Properties of Topological Polymer Brushes

1 August, 2017 - 00:00

 The Unique Properties of Topological Polymer Brushes

Can the performance of polymer brushes as steric stabilizers, biopassive layers and boundary lubricants be improved? The answer to this intriguing question encompasses the application of polymer grafts presenting different chain topologies, beyond chain linearity. Polymer adsorbates forming loops and cyclic macromolecules yielding cyclic brushes on flat and nanoparticle surfaces generate films with unique physicochemical properties. Benetti and co-workers review their preparation, characterization and modeling, trying to redefine the paradigm for surface functionalization by polymer grafting. More information can be found in the Minireview by E. M. Benetti et al. (DOI: 10.1002/chem.201701940).

[Cover Picture]
Edmondo M. Benetti, Mohammad Divandari, Shivaprakash N. Ramakrishna, Giulia Morgese, Wenqing Yan, Lucca Trachsel
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702836 Read article

Photoactive Surface-Grafted Polymer Brushes with Phthalocyanine Bridging Groups as an Advanced Architecture for Light-Harvesting

1 August, 2017 - 00:00

Photoactive Surface‐Grafted Polymer Brushes with Phthalocyanine Bridging Groups as an Advanced Architecture for Light‐Harvesting

A novel ladder-like architecture was proposed for surface-grafted photoactive brushes. Axially bifunctionalized phthalocyanines were used to bridge the chains adopting extended conformations in densely grafted brushes. Such an arrangement of chromophores makes the system promising for light-harvesting applications (see scheme).

[Communication]
Michał Szuwarzyński, Karol Wolski, Agata Pomorska, Tomasz Uchacz, Arkadiusz Gut, Łukasz Łapok, Szczepan Zapotoczny
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702737 Read article

Convenient Access to <i>meta</i>-Substituted Phenols by Palladium-Catalyzed Suzuki–Miyaura Cross-Coupling and Oxidation

1 August, 2017 - 00:00

Convenient Access to meta‐Substituted Phenols by Palladium‐Catalyzed Suzuki–Miyaura Cross‐Coupling and Oxidation

Catalytic two-step: The tandem palladium-catalyzed cross-coupling of b-chlorocyclohexenones and subsequent palladium-catalyzed oxidation provide access to meta-substituted and ortho,meta-disubstituted phenols.

[Full Paper]
Zi Wang, Arturo Orellana
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702651 Read article

Isomer Dependence on the Reactivity of Diazenes with Pentaphenylborole

1 August, 2017 - 00:00

Isomer Dependence on the Reactivity of Diazenes with Pentaphenylborole

To B or not to B? Reactions of the anti-aromatic pentaphenylborole with diazenes furnished a range of unique boracycles with the outcome influenced by whether the trans or cis diazene isomer is reacted.

[Full Paper]
Venkata A. K. Adiraju, Caleb D. Martin
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702539 Read article

Syntheses, Structures, and Solution Studies of Multicomponent Macrocycles and Cages Based on Versatile Ligands

1 August, 2017 - 00:00

Syntheses, Structures, and Solution Studies of Multicomponent Macrocycles and Cages Based on Versatile Ligands

Making metal sandwiches: Various types of multicomponent half-sandwich rhodium macrocycles and cages were selectively constructed utilizing two multifunctional hydroxamate ligands. An equilibrium between the hexanuclear and octanuclear macrocycles was investigated in solution, and molecules with different point symmetries were found in the Rh–Ag assemblies (see figure).

[Full Paper]
Ying-Ying Zhang, Wen-Xi Gao, Yue-Jian Lin, Li-Wei Mi, Guo-Xin Jin
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702244 Read article

Metal-Ion-Activated DNAzymes Used for Regulation of Telomerase Activity in Living Cells

1 August, 2017 - 00:00

Metal‐Ion‐Activated DNAzymes Used for Regulation of Telomerase Activity in Living Cells

Cell fate: A simple and new strategy to modulate telomerase activity in living cells has been developed based on metal-ion-activated DNAzymes (see scheme). This assay can be further used for control of cell fate. Through modulation of telomerase activity, cellular behavior can be regulated, including cell migration, cell differentiation, cell senescence, and cell cycle.

[Communication]
Jiasi Wang, Hongshuang Qin, Faming Wang, Jinsong Ren, Xiaogang Qu
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702236 Read article

Thin, High-Flux, Self-Standing, Graphene Oxide Membranes for Efficient Hydrogen Separation from Gas Mixtures

1 August, 2017 - 00:00

Thin, High‐Flux, Self‐Standing, Graphene Oxide Membranes for Efficient Hydrogen Separation from Gas Mixtures

Fine separation: A self-standing graphene oxide membrane shows outstanding separation efficiency for mixtures of H2/CO2 and H2/hydrocarbons (see figure). Large-scale preparation of high-quality, self-standing, thin, graphene oxide membranes and their application for efficient H2 separation from gas mixtures is reported.

[Full Paper]
Daniel Bou&#x161;a, Karel Friess, Kry&#x161;tof Pilná&#x10D;ek, Ond&#x159;ej Vopi&#x10D;ka, Marek Lan&#x10D;, Kristián Fónod, Martin Pumera, David Sedmidubský, Jan Luxa, Zden&#x11B;k Sofer
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702233 Read article

Ammonothermal Synthesis of Crystalline Oxonitride Perovskites LnTaON<sub>2</sub> (Ln=La, Ce, Pr, Nd, Sm, Gd)

1 August, 2017 - 00:00

Ammonothermal Synthesis of Crystalline Oxonitride Perovskites LnTaON2 (Ln=La, Ce, Pr, Nd, Sm, Gd)

Perovskite phases: Highly crystalline oxonitride perovskites (LnTaON2 Ln=La, Ce, Pr, Nd, Sm, Gd) were synthesized by the ammonothermal approach in custom-built high-pressure autoclaves at relatively low temperatures between 870–1070 K and pressures of up to 300 MPa. This more sophisticated route requires no precursor and gave cube-like crystals up to 15 &#x3BC;m (see scheme).

[Full Paper]
Niklas Cordes, Wolfgang Schnick
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702231 Read article

Design and Synthesis of Cyclic Mismatch-Binding Ligands (CMBLs) with Variable Linkers by Ring-Closing Metathesis and their Photophysical and DNA Repeat Binding Properties

1 August, 2017 - 00:00

Design and Synthesis of Cyclic Mismatch‐Binding Ligands (CMBLs) with Variable Linkers by Ring‐Closing Metathesis and their Photophysical and DNA Repeat Binding Properties

It depends on the ring: A library of CMBLs was synthesized by using ring-closing metathesis (RCM) through variation of the nature of linker B (see scheme). The new compounds were characterized and there photophysical properties as well as their binding properties to biologically relevant DNA repeat sequences were investigated.

[Full Paper]
Sanjukta Mukherjee, Chikara Dohno, Kazuhiko Nakatani
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201702064 Read article

Aggregation-Induced Emission (AIE) Fluorophore Exhibits a Highly Ratiometric Fluorescent Response to Zn<sup>2+</sup> in vitro and in Human Liver Cancer Cells

1 August, 2017 - 00:00

Aggregation‐Induced Emission (AIE) Fluorophore Exhibits a Highly Ratiometric Fluorescent Response to Zn2+ in vitro and in Human Liver Cancer Cells

Let it shine: A novel fluorophore 8AQ containing an isobutylene unit exhibits a significant AIE feature and remarkable ratiometric response to Zn2+ in solution as well as intracellular bio-imaging behavior in human liver cancer cells. Conversely, fluorophore 8WB, which lacks the isobutylene moiety did not exhibit any significant fluorescent properties as a result of its more flexible molecular structure.

[Full Paper]
Hassan Mehdi, Weitao Gong, Huimin Guo, Michael Watkinson, Hua Ma, Ali Wajahat, Guiling Ning
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201701948 Read article

Loops and Cycles at Surfaces: The Unique Properties of Topological Polymer Brushes

1 August, 2017 - 00:00

 The Unique Properties of Topological Polymer Brushes

Going in circles: Grafting polymers capable of forming loops or cyclic macromolecules to yield brush films on surfaces, enables the distinctive physicochemical properties of linear brushes to be surpassed. In this Minireview the fabrication, characterization and applications of these polymer assemblies on flat surfaces and nanoparticles is summarized.

[Minireview]
Edmondo M. Benetti, Mohammad Divandari, Shivaprakash N. Ramakrishna, Giulia Morgese, Wenqing Yan, Lucca Trachsel
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201701940 Read article

Conjunction of Pyrrole and Amide Moieties: Highly Anion-Responsive π-Electronic Molecules Forming Ion-Free and Ion-Pairing Assemblies

1 August, 2017 - 00:00

 Highly Anion‐Responsive &#x3C0;‐Electronic Molecules Forming Ion‐Free and Ion‐Pairing Assemblies

A good reception: Dipyrrolyldiketone BF2 complexes with amide units at pyrrole &#x3B1;-positions were synthesized and showed extremely high anion-binding affinities through multiple hydrogen bonding (see figure). Anion-binding behavior examined by 1H NMR spectroscopy along with theoretical studies suggested rapid pyrrole inversions in solution state. In the solid state, chiral helical structures of an anion-free receptor and ion-pairing assemblies of anion complexes were formed through hydrogen bonding.

[Full Paper]
Atsuko Kuno, Norimitsu Tohnai, Nobuhiro Yasuda, Hiromitsu Maeda
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201701921 Read article

Coinage Metal Superatomic Cores: Insights into Their Intrinsic Stability and Optical Properties from Relativistic DFT Calculations

1 August, 2017 - 00:00

 Insights into Their Intrinsic Stability and Optical Properties from Relativistic DFT Calculations

Coin flip: Coinage-metal atomically precise nanoclusters of a well-defined metallic core embedded in a ligand-protecting outer shell are well known for gold, but silver and copper examples remain scare. DFT relativistic calculations on superatomic metallic cores indicate that copper species are almost as stable as gold clusters and more stable than their silver counterparts (see scheme).

[Full Paper]
Franck Gam, Dayan Paez-Hernandez, Ramiro Arratia-Perez, C. W. Liu, Samia Kahlal, Jean-Yves Saillard, Alvaro Muñoz-Castro
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201701673 Read article

Partially Acetylated or Benzoylated Arabinose Derivatives as Structurally Simple Organogelators: Effect of the Ester Protecting Group on Gel Properties

1 August, 2017 - 00:00

 Effect of the Ester Protecting Group on Gel Properties

Minimal protection: Structurally simple partially acetylated or benzoylated arabinose derivatives are reported as gelators (see figure). The reasons for the greater mechanical robustness of the benzoylated derivatives than that of the acetylated derivatives have been investigated and are reported.

[Full Paper]
Rajkamal, Navendu P. Pathak, Tanmoy Halder, Shubhajit Dhara, Somnath Yadav
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201701669 Read article

Proteins with Site-Specific Lysine Methylation

1 August, 2017 - 00:00

Proteins with Site‐Specific Lysine Methylation

Epegenetic mark: Lysine methylations play critical roles in the regulation of both chromatin and non-chromatin proteins. There are three levels of lysine methylation, mono-, di-, and trimethylation. For the biochemical characterization of proteins with lysine methylation, multiple chemical biology methods have been developed.

[Concept]
Zhipeng A. Wang, Wenshe R. Liu
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201701655 Read article

Dithiafulvenyl-Extended <i>N</i>-Heterotriangulenes and Their Interaction with C<sub>60</sub>: Cooperative Fluorescence

1 August, 2017 - 00:00

 Cooperative Fluorescence

Enlightened association: Electron-rich N-heterotriangulenes featuring dithiafulvenyl moieties were synthesized and their association with C60 resulting in cooperative fluorescence was studied by photophysical, voltammetric, and mass spectrometric methods and rationalized by DFT calculations.

[Full Paper]
Bettina D. Gliemann, Volker Strauss, Jakob F. Hitzenberger, Pavlo O. Dral, Frank Hampel, Jean-Paul Gisselbrecht, Thomas Drewello, Walter Thiel, Dirk M. Guldi, Milan Kivala
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201701625 Read article

Computational Elucidation of a Role That Brønsted Acidification of the Lewis Acid-Bound Water Might Play in the Hydrogenation of Carbonyl Compounds with H<sub>2</sub> in Lewis Basic Solvents

1 August, 2017 - 00:00

Computational Elucidation of a Role That Brønsted Acidification of the Lewis Acid‐Bound Water Might Play in the Hydrogenation of Carbonyl Compounds with H2 in Lewis Basic Solvents

Food for thought: Transition-state calculations indicate the role that Brønsted acidification of water, due to Lewis acid complexation, might play in the mechanism of the hydrogenation of carbonyl compounds in Lewis basic solvents with H2 under non-anhydrous conditions.

[Communication]
Mojgan Heshmat, Timofei Privalov
Chem. Eur. J., August 01, 2017, https://doi.org/10.1002/chem.201700937 Read article

Embedding Reduced Graphene Oxide in Bacterial Cellulose-Derived Carbon Nanofibril Networks for Supercapacitors

1 August, 2017 - 00:00

Embedding Reduced Graphene Oxide in Bacterial Cellulose‐Derived Carbon Nanofibril Networks for Supercapacitors

Get networking: A simple, effective, eco-friendly, and scalable reduced graphene oxide embedding strategy is developed to construct self-supported, high-capacitance carbon electrode material networks for high-class supercapacitors from a naturally occurring biomaterial−bacterial cellulose.

[Communication]
Yanhong Chang, Lu Zhou, Zhichang Xiao, Jiaxu Liang, Debin Kong, Zihao Li, Xinghao Zhang, Xianglong Li, Linjie Zhi
ChemElectroChem, August 01, 2017, https://doi.org/10.1002/celc.201700625 Read article

Monodisperse Nano-Fe<sub>3</sub>O<sub>4</sub> on α-Al<sub>2</sub>O<sub>3</sub> Catalysts for Fischer–Tropsch Synthesis to Lower Olefins: Promoter and Size Effects

1 August, 2017 - 00:00

Monodisperse Nano‐Fe3O4 on &#x3B1;‐Al2O3 Catalysts for Fischer–Tropsch Synthesis to Lower Olefins: Promoter and Size Effects

Engineered catalysts: A monodisperse nano-Fe3O4 on &#x3B1;-Al2O3 catalyst synthesized by a novel two-step method of thermal decomposition and impregnation shows enhanced activity and stability for the Fischer–Tropsch synthesis to lower olefins. The effects of promoters (K and S) and size are investigated as well.

[Full Paper]
Yong Yuan, Shouying Huang, Hongyu Wang, Yifan Wang, Jian Wang, Jing Lv, Zhenhua Li, Xinbin Ma
ChemCatChem, August 01, 2017, https://doi.org/10.1002/cctc.201700792 Read article

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