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Articles from Wiley

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The latest chemistry from ChemPubSoc Europe and Wiley-VCH
Updated: 15 weeks 1 day ago

Photocatalytic Aerobic Oxidation of Alkenes into Epoxides or Chlorohydrins Promoted by a Polymer-Supported Decatungstate Catalyst

2 August, 2017 - 00:00

Photocatalytic Aerobic Oxidation of Alkenes into Epoxides or Chlorohydrins Promoted by a Polymer‐Supported Decatungstate Catalyst

Pick and choose: An efficient photocatalytic method for the aerobic oxidation of alkenes to afford either the corresponding epoxides or chlorohydrins, depending on the solvent of choice, is presented. This effective approach uses a novel polymer-supported decatungstate catalyst bearing a poly(isopropylacrylamide alkylammonium) matrix and yields the corresponding products in moderate to excellent yields.

[Article]
Theodoros S. Symeonidis, Alexandros Athanasoulis, Rikako Ishii, Yasuhiro Uozumi, Yoichi M. A. Yamada, Ioannis N. Lykakis
ChemPhotoChem, August 02, 2017, https://doi.org/10.1002/cptc.201700079 Read article

Flocculation of Clay Colloids Induced by Model Polyelectrolytes: Effects of Relative Charge Density and Size

2 August, 2017 - 00:00

 Effects of Relative Charge Density and Size

Flocculation of colloidal platelets by oppositely charged polyelectrolyte chains is studied on a clay–ionene model system, with an emphasis on the relative charge density and relative size of the two components. Clear differences in the flocculation behavior are visible as a function of the ionene charge density, which governs the conformation of the ionene chains on the clay surface.

[Article]
Yasine Sakhawoth, Laurent J. Michot, Pierre Levitz, Natalie Malikova
ChemPhysChem, August 02, 2017, https://doi.org/10.1002/cphc.201700430 Read article

Competitive Energy and Electron Transfer in β-Functionalized Free-Base Porphyrin–Zinc Porphyrin Dimer Axially Coordinated to C<sub>60</sub>: Synthesis, Supramolecular Formation and Excited-State Processes

2 August, 2017 - 00:00

Competitive Energy and Electron Transfer in &#x3B2;‐Functionalized Free‐Base Porphyrin–Zinc Porphyrin Dimer Axially Coordinated to C60: Synthesis, Supramolecular Formation and Excited‐State Processes

A new supramolecular triad comprised of &#x3B2;-functionalized conjugated free-base porphyrin–zinc porphyrin and axially coordinated electron acceptor fullerene has been successfully synthesized. Under light illumination, simultaneous energy transfer to free-base porphyrin and electron transfer to fullerene competitively occur. The cover picture highlights these findings and uses a tug of war to demonstrate the competitive events. More information can be found in the Full Paper by H. Wang, F. D'Souza et al. (DOI: 10.1002/chem.201702178).

[Cover Picture]
Yi Hu, Michael B. Thomas, R. G. Waruna Jinadasa, Hong Wang, Francis D'Souza
Chem. Eur. J., August 02, 2017, https://doi.org/10.1002/chem.201703136 Read article

Synthesis of <i>gem</i>-Dinitromethylated and Fluorodinitromethylated Derivatives of 5,5′-Dinitro-bis-1,2,4-triazole as Promising High-Energy-Density Materials

2 August, 2017 - 00:00

Synthesis of gem‐Dinitromethylated and Fluorodinitromethylated Derivatives of 5,5′‐Dinitro‐bis‐1,2,4‐triazole as Promising High‐Energy‐Density Materials

A new family of gem-dinitromethylated and fluorodinitromethylated energetic compounds based on 5,5’-dinitro-3,3’-bis-1,2,4-triazole (DNBT) shows high energy density, good thermal stability, and excellent detonation properties. The proposed strategy of introducing gem-dinitromethyl and fluorodinitromethyl groups into DNBT frameworks demonstrates a great promise for developing new-generation high-energy-density materials (HEDMs) with high-performing detonation level and low sensitivity. More information can be found in the Full Paper by Q. Zhang et al. (DOI: 10.1002/chem.201702451)

[Cover Picture]
Shi Huang, Junjun Tian, Xiujuan Qi, Kangcai Wang, Qinghua Zhang
Chem. Eur. J., August 02, 2017, https://doi.org/10.1002/chem.201703132 Read article

Ultrafast Molecular Rotors and Their CO<sub>2</sub> Tuning in MOFs with Rod-Like Ligands

2 August, 2017 - 00:00

Ultrafast Molecular Rotors and Their CO2 Tuning in MOFs with Rod‐Like Ligands

MOF, I′m only dancing: CO2 gas flows into the Zn-based MOF which sustains ultrafast rotors and intervenes actively in the motional mechanics, increasing reversibly the energy barrier for rotation and allowing active manipulation of molecular rotor dynamics (see figure).

[Communication]
Silvia Bracco, Fabio Castiglioni, Angiolina Comotti, Simona Galli, Mattia Negroni, Angelo Maspero, Piero Sozzani
Chem. Eur. J., August 02, 2017, https://doi.org/10.1002/chem.201702930 Read article

Total Syntheses of Pyroclavine, Festuclavine, Lysergol, and Isolysergol via a Catalytic Asymmetric Nitro-Michael Reaction

2 August, 2017 - 00:00

Total Syntheses of Pyroclavine, Festuclavine, Lysergol, and Isolysergol via a Catalytic Asymmetric Nitro‐Michael Reaction

Vicinal stereocenter: Unified total syntheses of a number of ergot alkaloids has been envisioned via a key thiourea-catalyzed intramolecular nitronate addition onto &#x3B1;,&#x3B2;-unsaturated ester to achieve exceptional levels of enantioselectivity (up to 97 % ee) with moderate diastereoselectivity (up to 4:1; see scheme). This methodology ensures first total syntheses of pyroclavine (1 e), and festuclavine (1 c), in addition to other congeners such as, lysergol (1 b), and isolysergol (1 d).

[Communication]
Subhajit Bhunia, Saikat Chaudhuri, Alakesh Bisai
Chem. Eur. J., August 02, 2017, https://doi.org/10.1002/chem.201702459 Read article

A Target-Directed Chemo-Photothermal System Based on Transferrin and Copolymer-Modified MoS<sub>2</sub> Nanoplates with pH-Activated Drug Release

2 August, 2017 - 00:00

A Target‐Directed Chemo‐Photothermal System Based on Transferrin and Copolymer‐Modified MoS2 Nanoplates with pH‐Activated Drug Release

A target-directed chemo-photothermal therapy system with pH-activated drug release behavior is prepared based on MoS2 nanoplates modified with transferrin and copolymer P(OEG-A)-b-P(VBA-co-KH570). The as-prepared DOX-POVK-MoS2-Tf nanocomposites exhibit well a therapeutic effect to HepG2 cells owing to the combined effects of target-directed uptake, acid-triggered drug release and NIR-induced localized heating, which suggest the designed MoS2 nanocarriers are promising for active-targeting chemo-photothermal synergetic therapy.

[Full Paper]
Aitang Zhang, Aihua Li, Wenxue Tian, Zichao Li, Chen Wei, Yong Sun, Wei Zhao, Mengli Liu, Jingquan Liu
Chem. Eur. J., August 02, 2017, https://doi.org/10.1002/chem.201701916 Read article

Amorphous Cobalt Oxide Nanoparticles as Active Water-Oxidation Catalysts

2 August, 2017 - 00:00

Amorphous Cobalt Oxide Nanoparticles as Active Water‐Oxidation Catalysts

WOC of life: Amorphous cobalt oxide nanoparticles (2 nm) composed of one-dimensional chains of dimeric edge-sharing octahedra are extremely active towards water oxidation with a turnover frequency (TOF) value reaching 8.6 s−1 in the photocatalytic Ru(bpy)32+–Na2S2O8 (bpy=2,2′-bipyridyl) system.

[Communication]
Zheng Chen, Zhiyao Duan, Zhiliang Wang, Xiaoyan Liu, Lin Gu, Fuxiang Zhang, Michel Dupuis, Can Li
ChemCatChem, August 02, 2017, https://doi.org/10.1002/cctc.201700882 Read article

Palladium-Catalyzed Ethylene/Methyl Acrylate Co-Oligomerization: The Effect of a New Nonsymmetrical α-Diimine with the 1,4-Diazabutadiene Skeleton

2 August, 2017 - 00:00

Palladium‐Catalyzed Ethylene/Methyl Acrylate Co‐Oligomerization: The Effect of a New Nonsymmetrical &#x3B1;‐Diimine with the 1,4‐Diazabutadiene Skeleton

Leg up for oligomers: PdII complexes with a new nonsymmetrical bis(aryl-imino)diazabutadiene ligand are studied as precatalysts in the ethylene/methyl acrylate co-oligomerization. A comparison with the corresponding aryl &#x3B1;-diimines with an acenaphthene skeleton shows that the bis(aryl-imino)diazabutadiene derivatives are more productive.

[Full Paper]
Vera Rosar, Tiziano Montini, Gabriele Balducci, Ennio Zangrando, Paolo Fornasiero, Barbara Milani
ChemCatChem, August 02, 2017, https://doi.org/10.1002/cctc.201700504 Read article

The Role of Gas in Determining Image Quality and Resolution During In Situ Scanning Transmission Electron Microscopy Experiments

2 August, 2017 - 00:00

The Role of Gas in Determining Image Quality and Resolution During In Situ Scanning Transmission Electron Microscopy Experiments

Quality images: In situ environmental (scanning) transmission electron microscopy (ESTEM) has opened up new opportunities for studying atomic-level dynamics in heterogeneous catalysis. This work provides the first evaluation of the sensitivity and resolution of STEM imaging mode with the presence of gases. ESTEM offers superior sensitivity and predictable resolution in imaging solid catalysts under realistic reaction conditions.

[Full Paper]
Yuanyuan Zhu, Nigel D. Browning
ChemCatChem, August 02, 2017, https://doi.org/10.1002/cctc.201700474 Read article

Preyssler Heteropolyacids in the Self-Etherification of 5-Hydroxymethylfurfural to 5,5′-[Oxybis(methylene)]bis-2-furfural Under Mild Reaction Conditions

2 August, 2017 - 00:00

Preyssler Heteropolyacids in the Self‐Etherification of 5‐Hydroxymethylfurfural to 5,5′‐[Oxybis(methylene)]bis‐2‐furfural Under Mild Reaction Conditions

Press on with Preyssler: The self-etherification of 5-hydroxymethylfurfural (5-HMF) is studied using Preyssler heteropolyacids (HPAs). The formation of 5,5′-[oxybis(methylene)]bis-2-furfural (OBMF) is related to the amount of Brønsted acid sites. The Lewis acidity of HPA/Al2O3 favors the formation of 2,5-dimethylfurane. A yield of 84 % of OBMF at 5 h and 343 K is obtained under the optimized conditions.

[Full Paper]
Alexander Páez, Hugo A. Rojas, Omar Portilla, Gabriel Sathicq, Carlos A. M. Afonso, Gustavo P. Romanelli, José J. Martínez
ChemCatChem, August 02, 2017, https://doi.org/10.1002/cctc.201700457 Read article

Synthesis of 4-Formyl-2-arylbenzofuran Derivatives by PdCl(C<sub>3</sub>H<sub>5</sub>)dppb-Catalyzed Tandem Sonogashira Coupling-Cyclization under Microwave Irradiation - Application to the Synthesis of Viniferifuran Analogues

1 August, 2017 - 00:00

Synthesis of 4‐Formyl‐2‐arylbenzofuran Derivatives by PdCl(C3H5)dppb‐Catalyzed Tandem Sonogashira Coupling‐Cyclization under Microwave Irradiation ‐ Application to the Synthesis of Viniferifuran Analogues

An improved method for the synthesis of 4-formyl-2-arylbenzofuran derivatives is described using tandem Sonogashira-cyclization on ortho-halophenol derivatives catalyzed by PdCl(C3H5)dppb. Further applications included the direct PdCl(C3H5)dppb catalyzed C-3 arylation of benzofurans and the synthesis of polyphenolic analogues of viniferifuran.

[Communication]
Duy D. Vo, Mikael Elofsson
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701490 Read article

Grow Bimetallic Platinum-Iridium Alloy on Reduced Graphene Oxide to Construct Hetero-Atomic Bridge Catalysis toward Efficient Electrooxidation of Methanol

1 August, 2017 - 00:00

Grow Bimetallic Platinum‐Iridium Alloy on Reduced Graphene Oxide to Construct Hetero‐Atomic Bridge Catalysis toward Efficient Electrooxidation of Methanol

Ir surface can easily produce Ir-OH species, which could directly oxidize the absorbed CO at its neighboring Pt atom, displaying a unique heteroatomic bridged catalysis. The as-prepared Pt4Ir1/rGO presents the most negative onset potential and the highest electrocatalytic activity toward methanol oxidation reaction, offering great potential of Pt4Ir1/rGO catalyst to replace Pt/C catalyst as superb anode catalyst for DMFCs.

[Full Paper]
Ling Zhou, Zhi Liang Zhao, Lian Ying Zhang, Hong Ming An, Chang Ming Li
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701379 Read article

In Situ Generation of Core-Shell Protein-Based Microcapsules with Regulated Ion Absorbance Capacity

1 August, 2017 - 00:00

In Situ Generation of Core‐Shell Protein‐Based Microcapsules with Regulated Ion Absorbance Capacity

We demonstrated a way to synthesize a new type of core-shell protein microcapsules composed of in-situ generated inner poly(o-phenylenediamine) (POPD) core and outer protein-based shell. Via controlling the permeability of the shell by the cleavage of the polymer or forming a TA/Fe3+ outer shell, the adsorption capacity of heavy metal ions of the inner POPD nanoparticles could be well modulated.

[Communication]
Pei Zhou, Lei Wang, Guangyu Wu, Yuting Zhou, Mohammad Hegazy, Xin Huang
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701339 Read article

Effects of Anthryl Groups on the Charge Transport and Photovoltaic Properties of Small Triarylamine-Based Donor-Acceptor Molecules: A Joint Experimental and Theoretical Study

1 August, 2017 - 00:00

 A Joint Experimental and Theoretical Study

Replacing an outer phenyl ring of triphenylamine in a small push-pull molecule by a 2-anthryl group produces a decrease of the hole-mobility of the resulting material while replacement by a 9-anthryl group has the opposite effect

[Full Paper]
Yue Jiang, Clément Cabanetos, Siriporn Jungsuttiwong, Domenico Alberga, Carlo Adamo, Jean Roncali
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701305 Read article

Co-crystals with Delayed Fluorescence Assembled by 1,4-Diiodotetrafluorobenzene and Polycyclic Aromatic Compounds via Halogen Bonds

1 August, 2017 - 00:00

Co‐crystals with Delayed Fluorescence Assembled by 1,4‐Diiodotetrafluorobenzene and Polycyclic Aromatic Compounds via Halogen Bonds

Four binary co-crystals with delayed fluorescence were prepared by solvent evaporation method. Crystal structure analysis reveals that the face-to-face pattern of 1,4-DITFB and donors, C−I•••&#x3C0; and C−I•••O interactions mainly formed the crystal structure, which also affects fluorescence emission

[Full Paper]
Hao Sun, Mingliang Wang, Arshad Khan, Yaqi Shan, Kun Zhao, Rabia Usman, Chunxiang Xu
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701288 Read article

Acclimation Strategy Using Complex Volatile Fatty Acid Mixtures Increases the Microbial Fuel Cell (MFC) Potential

1 August, 2017 - 00:00

Acclimation Strategy Using Complex Volatile Fatty Acid Mixtures Increases the Microbial Fuel Cell (MFC) Potential

Successful microbial acclimation: Bacteria from domestic wastewater were acclimated to acetic, propionic, and butyric acids in gradually more complex mixtures to produce electricity in microbial fuel cells. The acclimatization procedure allowed increasing the cell potential in a half of the potential reached with acetate as model substrate.

[Full Paper]
Alejandra Rosales-Sierra, Sergio Rosales-Mendoza, Elizabeth Monreal-Escalante, Lourdes B. Celis, Elías Razo-Flores, Bibiana Cercado
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701267 Read article

Phosphatase Mimicking Activity of Two Zinc(II) Schiff Base Complexes with Zn<sub>2</sub>O<sub>2</sub> Cores: NBO Analysis and MEP Calculation to Estimate Non-Covalent Interactions

1 August, 2017 - 00:00

 NBO Analysis and MEP Calculation to Estimate Non‐Covalent Interactions

Two new zinc(II) Schiff base complexes have been synthesized and characterized by X-ray crystallography. DFT calculations were employed to estimate contribution of various non-covalent interactions in the formation of self-assembly using several theoretical models. Excellent phosphatase mimicking activity was exhibited by both complexes.

[Full Paper]
Tanmoy Basak, Anik Bhattacharyya, Mithun Das, Klaus Harms, Antonio Bauzá, Antonio Frontera, Shouvik Chattopadhyay
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701246 Read article

Electrocatalytic Oxidations of Formic Acid and Ethanol over Pd Catalysts Supported on a Doped Polypyrrole-Carbon Composite

1 August, 2017 - 00:00

Electrocatalytic Oxidations of Formic Acid and Ethanol over Pd Catalysts Supported on a Doped Polypyrrole‐Carbon Composite

A polypyrrole-carbon composite (PPyCC) was prepared by doping polymerization method of polypyrrole over carbon with a dopant of camphor sulfonic acid (CSA), which was used as Pd catalyst support. The as-prepared Pd/PPyCC catalysts showed an excellent catalytic activity for electrooxidations of formic acid and ethanol with long-term durability. This newly developed support material should be of great importance and potential to the direct liquid fuel cell application.

[Full Paper]
Hyunsu Han, Yuseong Noh, Yoongon Kim, V. S. K. Yadav, Seongmin Park, Wongeun Yoon, Seungjun Lee, Won Bae Kim
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201701112 Read article

Cr–Containing Magnetic Oxides in a Methanol Synthesis: Does Cr Ion Distribution Matter?

1 August, 2017 - 00:00

 Does Cr Ion Distribution Matter?

Enhanced catalysis: A close contact between Cr3+ and Fe3O4 species and the enrichment of the nanoparticle surface with Cr ions ensure exceptional catalytic properties of these catalysts in the reaction of syngas to methanol and their high stability during repeated use.

[Full Paper]
Nicholas Baird, Jasper W. Dittmar, Yaroslav B. Losovyj, Maren Pink, David Gene Morgan, Barry D. Stein, Alexandra S. Torozova, Irina Yu. Krasnova, Maxim E. Grigoriev, Alexander I. Sidorov, Mikhail G. Sulman, Zinaida B. Shifrina, Lyudmila M. Bronstein
ChemistrySelect, August 01, 2017, https://doi.org/10.1002/slct.201700982 Read article

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