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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

Building Up Colors: Multilayered Arrays of Peryleneimides on Flat Surfaces and Mesoporous Layers

7 aprile, 2017 - 00:00

 Multilayered Arrays of Peryleneimides on Flat Surfaces and Mesoporous Layers

Filling up the pores: Multilayers composed of perylene dyes are deposited on thin Al2O3 layers and mesoporous TiO2 by a simple dip-by-dip process. As many as 33 layers can be grown on Al2O3, whereas the voids between particles of mesoporous TiO2 can be bridged with dye layers (see figure). Microcrystal growth during the process can be controlled by employing appropriate washing techniques.

[Full Paper]
Lijo George, Elena Efimova, Essi Sariola-Leikas, Kimmo Lahtonen, Mika Valden, Paola Vivo, Hanna Hakola, Arto Hiltunen, Alexander Efimov
ChemPlusChem, April 07, 2017, https://doi.org/10.1002/cplu.201700061 Read article

Generation of Aromatic (Dehydro)benzoannulene Dications Stabilized by Platinum Catecholate Complexes

7 aprile, 2017 - 00:00

Generation of Aromatic (Dehydro)benzoannulene Dications Stabilized by Platinum Catecholate Complexes

Aromatic cationic species: The triplatinum catecholate complex of dehydrobenzo[12]annulene or diplatinum catecholate complex of dibenzo[8]annulene are readily oxidized, generating mono-, di-, and trications or mono- and dications (see figure). On the basis of theoretical and experimental studies with respect to energetic, structural, and magnetic criteria, these dications are deduced to be aromatic.

[Communication]
Kazukuni Tahara, Hiroyoshi Kozuma, Varadhachari Venkatesh, Eri Ryomura, Hirokazu Miyoshi, Keigo Nakamachi, Ryohei Kishi, Hideaki Takahashi, Masayoshi Nakano, Yoshito Tobe
ChemPlusChem, April 07, 2017, https://doi.org/10.1002/cplu.201700018 Read article

Cytosine Radical Cations: A Gas-Phase Study Combining IRMPD Spectroscopy, UVPD Spectroscopy, Ion–Molecule Reactions, and Theoretical Calculations

7 aprile, 2017 - 00:00

 A Gas‐Phase Study Combining IRMPD Spectroscopy, UVPD Spectroscopy, Ion–Molecule Reactions, and Theoretical Calculations

All mixed up: The cytosine radical cation (Cyt.+), formed by dissociation from a ternary CuII complex, is present as a mixture of several low-energy amino-type tautomers in the gas phase. In this study, specific isomers are distinguished by the use of IR and UV action spectroscopy techniques, ion–molecule reactions, and theoretical calculations.

[Article]
Michael Lesslie, John T. Lawler, Andy Dang, Joseph A. Korn, Daniel Bím, Vincent Steinmetz, Philippe Maître, Frantisek Tureček, Victor Ryzhov
ChemPhysChem, April 07, 2017, https://doi.org/10.1002/cphc.201700281 Read article

Phenoxazine Derivative Operates as an Efficient Surface-Grafted Molecular Relay to Enhance the Performance and Stability of CdS- and CdSe-Sensitized TiO<sub>2</sub> Solar Cells

7 aprile, 2017 - 00:00

Phenoxazine Derivative Operates as an Efficient Surface‐Grafted Molecular Relay to Enhance the Performance and Stability of CdS‐ and CdSe‐Sensitized TiO2 Solar Cells

Relaying electrons: Enhanced performance and stability are achieved by constructing a phenoxazine molecular relay in CdS and CdSe-sensitized TiO2 solar cells.

[Article]
Chao Shen, Xingzhu Wang, Shasha Tang, Marc Courté, Denis Fichou
ChemPhysChem, April 07, 2017, https://doi.org/10.1002/cphc.201700238 Read article

Adiponitrile–Lithium Bis(trimethylsulfonyl)imide Solutions as Alkyl Carbonate-free Electrolytes for Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO)/LiNi<sub>1/3</sub>Co<sub>1/3</sub>Mn<sub>1/3</sub>O<sub>2</sub> (NMC) Li-Ion Batteries

7 aprile, 2017 - 00:00

Adiponitrile–Lithium Bis(trimethylsulfonyl)imide Solutions as Alkyl Carbonate‐free Electrolytes for Li4Ti5O12 (LTO)/LiNi1/3Co1/3Mn1/3O2 (NMC) Li‐Ion Batteries

Safer Li-ion batteries: A safe electrolyte consisting of high temperature stability solvent and salt is applied in Li-ion batteries. The electrolyte was formulated by using adiponitrile and lithium bis(trimethylsulfonyl)imide (LiTFSI) and then studied in a battery system made by an Li4Ti5O12 (LTO) anode and LiNi1/3Co1/3Mn1/3O2 (NMC) cathode.

[Article]
Douaa Farhat, Fouad Ghamouss, Julia Maibach, Kristina Edström, Daniel Lemordant
ChemPhysChem, April 07, 2017, https://doi.org/10.1002/cphc.201700058 Read article

Formation and Stability of Bulk Nanobubbles Generated by Ethanol–Water Exchange

7 aprile, 2017 - 00:00

Formation and Stability of Bulk Nanobubbles Generated by Ethanol–Water Exchange

Detecting elusive nanobubbles: Bulk nanobubbles are produced by ethanol and water exchange and detected by comparison with a degassed control sample. The NanoSight technique proves the existence of bulk nanobubbles (see figure), and can be used to determine optimum formation conditions.

[Article]
Jie Qiu, Zhenglei Zou, Shuo Wang, Xingya Wang, Lei Wang, Yaming Dong, Hongwei Zhao, Lijuan Zhang, Jun Hu
ChemPhysChem, April 07, 2017, https://doi.org/10.1002/cphc.201700010 Read article

Direct C−H Phosphonylation of Electron-Rich Arenes and Heteroarenes by Visible-Light Photoredox Catalysis

7 aprile, 2017 - 00:00

Direct C−H Phosphonylation of Electron‐Rich Arenes and Heteroarenes by Visible‐Light Photoredox Catalysis

A general, mild, and broadly applicable visible-light photoredox C−H bond phosphonylation method for electron-rich arenes and heteroarenes is reported. The photoredox catalytic protocol utilizes electron-rich arenes and biologically important heteroarenes as substrates, [Ru(bpz)3][PF6]2 as photocatalyst, ammonium persulfate as oxidant, and trialkyl phosphites as the phosphorus source to provide a wide range of aryl phosphonates at ambient temperature under very mild reaction conditions.

[Communication]
Rizwan S. Shaikh, Indrajit Ghosh, Burkhard König
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201701283 Read article

Carboranes as Aryl Mimetics in Catalysis: A Highly Active Zwitterionic NHC-Precatalyst

7 aprile, 2017 - 00:00

 A Highly Active Zwitterionic NHC‐Precatalyst

We decided to approach this key issue from a completely new perspective by moving one group to the left in the periodic table from carbon to boron and employing carboranes as aryl mimetics.” Read more about the story behind the cover in the Cover Profile and about the research itself on page ▪▪ ff. (DOI: 10.1002/chem.201700209).

[Cover Profile]
Christoph Selg, Wilma Neumann, Peter Lönnecke, Evamarie Hey-Hawkins, Kirsten Zeitler
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201701145 Read article

Carboranes as Aryl Mimetics in Catalysis: A Highly Active Zwitterionic NHC-Precatalyst

7 aprile, 2017 - 00:00

 A Highly Active Zwitterionic NHC‐Precatalyst

A new offspring of the organocatalyst family has hatched from the merger of covalent catalysis and a carborane as an aryl-mimetic replacement: the novel zwitterionic triazolium based N-heterocyclic carbene (NHC) precatalyst bears a 7,8-dicarba-nido-undecaboranyl substituent (nidus (lat.)=nest) and offers excellent activity and broad applicability in a wide range of organocatalytic transformations. The straightforward synthesis and a detailed comparison to recent aryl-based precatalysts provides useful insights to pave the way for further development of this unprecedented class of catalysts. More information can be found in the Full Paper by K. Zeitler et al. (DOI: 10.1002/chem.201700209).

[Cover Picture]
Christoph Selg, Wilma Neumann, Peter Lönnecke, Evamarie Hey-Hawkins, Kirsten Zeitler
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201701037 Read article

Inorganic SnIP-Type Double Helices in Main-Group Chemistry

7 aprile, 2017 - 00:00

Inorganic SnIP‐Type Double Helices in Main‐Group Chemistry

Inorganic twisted partners: Quantum chemistry was used to explore SnIP-type inorganic double helix semiconductors MXPn of Group 14, 15, and 17 elements. An inner Pn helix (red) is surrounded by an MX helix (blue) forming a hexagonal closed packing of double helices (see figure). According to our study, the exploration of new one-dimensional polyphosphide and polyarsenide representatives will be most probable for the heavy Group 14 and 17 elements.

[Full Paper]
Maximilian Baumgartner, Richard Weihrich, Tom Nilges
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201700929 Read article

Metal–Organic Synthetic Transporters (MOST): Efficient Chloride and Antibiotic Transmembrane Transporters

7 aprile, 2017 - 00:00

 Efficient Chloride and Antibiotic Transmembrane Transporters

Making the MOST of it: Formation of metal–organic synthetic transporters (MOST) in phospholipid membranes. MOST make the membranes of resistant bacteria more permeable to antibiotics. As a potential strategy to combat resistant bacteria, we demonstrate that the combination of MOST with tetracycline lowers the sensitivity of resistant bacteria by 60-fold.

[Full Paper]
Julie Kempf, Andreea R. Schmitzer
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201700847 Read article

Concentration of Nitric Acid Strongly Influences Chemical Composition of Graphite Oxide

7 aprile, 2017 - 00:00

Concentration of Nitric Acid Strongly Influences Chemical Composition of Graphite Oxide

Tuneable graphite oxide: Changing the nitric acid concentration in the synthesis of graphite oxide allows a continuous change in its composition. Samples are prepared using various nitric acid concentrations (see figure), and are investigated through various spectroscopic and analytical methods. With lower concentrations of nitric acid required, the overall cost of graphite oxide synthesis may be reduced significantly.

[Full Paper]
Ond&#x159;ej Jankovský, Michal Nová&#x10D;ek, Jan Luxa, David Sedmidubský, Marie Bohá&#x10D;ová, Martin Pumera, Zden&#x11B;k Sofer
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201700809 Read article

Metallapentalenofurans and Lactone-Fused Metallapentalynes

7 aprile, 2017 - 00:00

Metallapentalenofurans and Lactone‐Fused Metallapentalynes

Metal in the roof: The first &#x3B1;-metallapentalenofurans and lactone-fused metallapentalynes were constructed by the reactions of metallapentalyne with aryl alkynes under different conditions. DFT calculations reveal that this novel metallapentalenofuran framework exhibits Möbius aromaticity derived from the 11-center-12-electron d&#x3C0;–p&#x3C0; &#x3C0;-conjugation.

[Full Paper]
Zhengyu Lu, Congqing Zhu, Yuanting Cai, Jun Zhu, Yuhui Hua, Zhixin Chen, Jiangxi Chen, Haiping Xia
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201700789 Read article

NHC-Catalyzed Metathesis and Phosphorylation Reactions of Disulfides: Development and Mechanistic Insights

7 aprile, 2017 - 00:00

 Development and Mechanistic Insights

In an instant! N-heterocyclic carbenes (NHCs) served as versatile organocatalysts to promote disulfide exchange and phosphite–disulfide coupling reactions under mild conditions. This metal- and oxidant-free protocol is operationally simple and highly efficient with very short reaction times.

[Communication]
Reece D. Crocker, Mohanad A. Hussein, Junming Ho, Thanh V. Nguyen
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201700744 Read article

Hierarchical Growth of Supramolecular Structures Driven by Pimerization of Tetrahedrally Arranged Bipyridinium Units

7 aprile, 2017 - 00:00

Hierarchical Growth of Supramolecular Structures Driven by Pimerization of Tetrahedrally Arranged Bipyridinium Units

Stay in shape: A shape-persistent molecule made of four tetrahedrally arranged bipyridinium units undergoes intermolecular pimerization upon reduction, leading to hierarchical supramolecular growth (see figure).

[Full Paper]
Marianna Marchini, Massimo Baroncini, Giacomo Bergamini, Paola Ceroni, Mila D'Angelantonio, Paola Franchi, Marco Lucarini, Fabrizia Negri, Tomasz Szreder, Margherita Venturi
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201700137 Read article

Designed Synthesis of Lipid-Coated Polyacrylic Acid/Calcium Phosphate Nanoparticles as Dual pH-Responsive Drug-Delivery Vehicles for Cancer Chemotherapy

7 aprile, 2017 - 00:00

Designed Synthesis of Lipid‐Coated Polyacrylic Acid/Calcium Phosphate Nanoparticles as Dual pH‐Responsive Drug‐Delivery Vehicles for Cancer Chemotherapy

Lipids smooth the way: A simple strategy was developed to prepare supported lipid-bilayer-coated polyacrylic acid/calcium phosphate nanoparticles (PAA/CaP@SLB NPs) as a novel dual pH-responsive drug-delivery platform for cancer chemotherapy in vitro and in vivo (see figure, i.v.=intravenous).

[Full Paper]
Xin Wang, Manjie Zhang, Lingyu Zhang, Lu Li, Shengnan Li, Chungang Wang, Zhongmin Su, Yue Yuan, Weisan Pan
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201700060 Read article

Porphyrin Donor and Tunable Push–Pull Acceptor Conjugates—Experimental Investigation of Marcus Theory

7 aprile, 2017 - 00:00

Porphyrin Donor and Tunable Push–Pull Acceptor Conjugates—Experimental Investigation of Marcus Theory

Molecular photovoltaics: A series of electron donor–acceptor conjugates incorporating a ZnII–porphyrin-based electron donor and multicyanobutadienes or extended tetracyanoquinodimethane analogues as electron acceptors with first reduction potentials ranging from −1.67 to −0.23 V vs. Fc+/Fc. As such, the rich redox chemistry, broad absorption in the visible and near infrared region, and electron-transfer behavior upon photoexcitation with charge recombination kinetics in the inverted region render these systems promising materials for applications in the field of molecular photovoltaics.

[Full Paper]
Tristan A. Reekie, Michael Sekita, Lorenz M. Urner, Stefan Bauroth, Laurent Ruhlmann, Jean-Paul Gisselbrecht, Corinne Boudon, Nils Trapp, Timothy Clark, Dirk M. Guldi, François Diederich
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201700043 Read article

Bis-picolinamide Ruthenium(III) Dihalide Complexes: Dichloride-to-Diiodide Exchange Generates Single <i>trans</i> Isomers with High Potency and Cancer Cell Selectivity

7 aprile, 2017 - 00:00

 Dichloride‐to‐Diiodide Exchange Generates Single trans Isomers with High Potency and Cancer Cell Selectivity

Tricks of the trade: This report presents compounds of the type [RuX2L2] (X=Cl or I, L=a functionalised picolinamide ligand; see figure). The [RuCl2L2] complexes exhibit a mixture of isomers and are active against a range of cancer cell lines. Upon a halide exchange reaction to their [RuI2L2] analogues, a single stable trans-iodide isomer is observed. These compounds show high cytotoxicity in the nanomolar range, are cytotoxic under hypoxic conditions and selective towards cancerous cells.

[Full Paper]
Aida M. Basri, Rianne M. Lord, Simon J. Allison, Andrea Rodríguez-Bárzano, Stephanie J. Lucas, Felix D. Janeway, Helena J. Shepherd, Christopher M. Pask, Roger M. Phillips, Patrick C. McGowan
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201605960 Read article

Soft, Wet-Chemical Synthesis of Metastable Superparamagnetic Hexagonal Close-Packed Nickel Nanoparticles in Different Ionic Liquids

7 aprile, 2017 - 00:00

Soft, Wet‐Chemical Synthesis of Metastable Superparamagnetic Hexagonal Close‐Packed Nickel Nanoparticles in Different Ionic Liquids

Doing the rounds: A simple, reproducible, and broadly applicable microwave-induced decomposition of nickel amidinate or [Ni(cyclooctadiene)2] for the synthesis of small and uniform Ni nanoparticles (NPs) in different ionic liquids is reported. The Ni NPs are mostly formed in the rare metastable hexagonal close-packed structure. The two Ni nanoparticles show very similar magnetic properties and they were catalytically active in alkene or benzene hydrogenation with over 90 % conversion.

[Full Paper]
Susann Wegner, Christina Rutz, Kai Schütte, Juri Barthel, Alexey Bushmelev, Annette Schmidt, Katharina Dilchert, Roland A. Fischer, Christoph Janiak
Chem. Eur. J., April 07, 2017, https://doi.org/10.1002/chem.201605251 Read article

Composites of Piezoelectric Materials and Silicon as Anodes for Lithium-Ion Batteries

7 aprile, 2017 - 00:00

Composites of Piezoelectric Materials and Silicon as Anodes for Lithium‐Ion Batteries

Ad-LIB: The diffusion behaviors of Li ions in silicon slabs with a piezoelectric field are investigated by using density functional theory. The results show that the diffusivity of Li in Si can be significantly enhanced by applying the electric field generated from the piezoelectric material. A new generation of anode composite materials can be designed based on this idea and the piezoelectric material is used to accommodate the volume variation of active materials of Si and enhance the charging rate of lithium-ion batteries.

[Article]
Zhiguo Wang, Zhijie Li, Yong Qing Fu
ChemElectroChem, April 07, 2017, https://doi.org/10.1002/celc.201700043 Read article

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