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Articles from Wiley

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The latest papers in ChemPubSoc Europe
Updated: 3 weeks 3 days ago

Coupled Dynamics of Anode and Cathode in Proton-Exchange Membrane Fuel Cells

5 August, 2019 - 00:00

An external reference electrode is used to monitor the cathodic potential during the operation of a direct methanol fuel cell and a direct formic acid fuel cell under the regular and oscillatory regimes. Cathodic oscillations synchronized with the cell voltage dynamics, which had not been reported so far for fuel cells, are observed in these systems. The results can be attributed to two main coupling processes, namely, coupling through proton concentration and a global coupling stemming from the control mode (potentiostatic or galvanostatic).

[Articles]
Jéssica A. Nogueira, Prof. Dr. Katharina Krischer, Prof. Dr. Hamilton Varela
doi.org/10.1002/cphc.201900531

Experimental Investigation of the Dynamical Modes of Four Pulse-Coupled Chemical Micro-Oscillators

5 August, 2019 - 00:00

Switching between different dynamical modes in a network of four pulse-coupled chemical micro-oscillators is studied.

[Communications]
Ivan S. Proskurkin, Pavel S. Smelov, Prof. Dr. Vladimir K. Vanag
doi.org/10.1002/cphc.201900421

Structure-Tunable Copper-Indium Catalysts for Highly Selective CO<sub>2</sub> Electroreduction to CO or HCOOH

5 August, 2019 - 00:00

Get In: Bimetallic copper-indium catalysts were synthesized by using a coprecipitation method. Distinct phase evolutions and product distributions can be achieved with varying metal compositions. The Cu-In catalysts are found to be among the best reported In-based catalysts for electrochemical CO2 reduction to CO or HCOOH, with selectivity depending on structure-sensitive binding strength of key reactive intermediates.

[Communications]
Prof. Minghui Zhu, Dr. Pengfei Tian, Jiayu Li, Jiacheng Chen, Prof. Jing Xu, Prof. Yi-Fan Han
doi.org/10.1002/cssc.201901884

Bio-Inspired Synthesis of Hematite Mesocrystals by Using Xonotlite Nanowires as Growth Modifiers and Their Improved Oxygen Evolution Activity

5 August, 2019 - 00:00

A word to the wires: Hematite particles are prepared by using xonotlite nanowires (XNWs) as growth modifiers. The concentrations of XNWs and iron(III) ions can control the morphology and size of the hematite particles. The obtained particles exhibit good catalytic performance in the oxygen evolution reaction, affording a current density of 10 mA cm−2 with an overpotential of 370 mV, a small Tafel slope of 65 mV dec−1, and good stability in alkaline electrolyte.

[Communications]
Dr. Yang-Yi Liu, Fu-Jia Chang, Dr. Huai-Ling Gao, Si-Ming Chen, Prof. Dr. Min-Rui Gao, Dr. Ya-Rong Zheng, Prof. Dr. Helmut Cölfen, Dr. Chuan-Xin He, Prof. Dr. Shu-Hong Yu
doi.org/10.1002/cssc.201900861

Novel Perovskite Materials for Thermal Water Splitting at Moderate Temperature

5 August, 2019 - 00:00

Clean hydrogen can be produced through water splitting at moderate temperature (700 °C) by two-step reversible thermochemical cycles based on the perovskite oxides Sr2CoNb1−xTixO6−δ (x=1, 0.7; δ=number of oxygen vacancies). These compounds show outstanding hydrogen yield, making them potentially useful for real applications.

[Full Papers]
Prof. M. Teresa Azcondo, Dr. María Orfila, Prof. Javier Marugán, Prof. Raúl Sanz, Dr. Alvaro Muñoz-Noval, Dr. Eduardo Salas-Colera, Dr. Clemens Ritter, Prof. Flaviano García-Alvarado, Prof. Ulises Amador
doi.org/10.1002/cssc.201901484

Solvent and Counter-Ion Induced Coordination Environment Changes Towards Ag<sup>I</sup> Coordination Polymers

5 August, 2019 - 00:00

Silver coordination polymers using the multimodal and flexible 9,9′-bis(4,5-diazafluorene) ligand. Changing coordination and topology by exploiting solvent and counterion effects.

[Communications]
Arvind Kumar Gupta, Daniel Morales Salazar, Andreas Orthaber
doi.org/10.1002/ejic.201900722

Calcium Amido Complexes Coordinated by Tridentate Amidinate Ligands: Synthesis, Structures and Catalytic Activity in Olefin Hydrophosphination and Polymerization of Cyclic Esters

5 August, 2019 - 00:00

Heteroleptic calcium amidoamidinate complexes [2-(Ph2P=NPh)C6H4NC(tBu)=N(2,6-R2C6H3)]Ca[N(SiMe3)2](thf) {R = iPr (1); R = Me (2)} catalyze intermolecular hydrophosphination C=C and C≡C bonds and ROP of ε-caprolactone and rac-lactide.

[Full Papers]
Aleksei O. Tolpygin, Anton V. Cherkasov, Georgy K. Fukin, Tatyana A. Kovylina, Konstantin A. Lyssenko, Alexander A. Trifonov
doi.org/10.1002/ejic.201900610

Influence of Hetero-Biaryl Ligands on the Photo-Electrochemical Properties of [Re<sup>I</sup>NCS(N<sup>∩</sup>N)(CO)<sub>3</sub>]-Type Photosensitizers

5 August, 2019 - 00:00

A systematic variation of bi-, tri- and tetra-azo substituted diimine ligands reveals pyridazine as a promising scaffold for increased visible absorption, whilst maintaining relatively long lifetimes and quantum yields.

[Full Papers]
Mathias Mosberger, Benjamin Probst, Bernhard Spingler, Roger Alberto
doi.org/10.1002/ejic.201900652

Catalytic Assessment of Copper(I) Complexes and a Polymer Analog towards the One-Pot Synthesis of Imines and Quinoxalines

5 August, 2019 - 00:00

Copper(I) complex containing acylthiourea and its heterogeneous counterpart catalyse the synthesis of imines and quinoxalines. Heterogeneous catalyst has the advantage of reusability.

[Full Papers]
Dharmalingam Sindhuja, Punitharaj Vasanthakumar, Nattamai Bhuvanesh, Ramasamy Karvembu
doi.org/10.1002/ejic.201900555

Effects of Arginine Deimination and Citrulline Side-Chain Length on Peptide Secondary Structure Formation

1 August, 2019 - 00:00

Citrullination and secondary structure formation: Arginine deimination (citrullination) converts the positively charged guanidinium moiety into a neutral urea group, disfavoring α-helix formation but causing minimal change in β-sheet formation.

[Full Papers]
Po-Yi Wu, Chin-Yi Chen, Jhe-Hao Li, Jin-Kai Lin, Ting-Hsuan Chen, Dr. Shing-Jong Huang, Shou-Ling Huang, Prof. Richard P. Cheng
doi.org/10.1002/cbic.201900231

Automatic Full Glycan Structural Determination through Logically Derived Sequence Tandem Mass Spectrometry

1 August, 2019 - 00:00

One fragment at a time: A logical sequence for tandem mass spectrometry is derived based on an understanding of oligosaccharide dissociation mechanisms in a mass spectrometer. This sequence, which enables the linkage positions, anomeric configurations, and monosaccharide constituents of oligosaccharides to be determined efficiently, can be coded into a computer-controlled mass spectrometer for automatic structural determination.

[Full Papers]
Dr. Shang-Ting Tsai, Chia Yen Liew, Dr. Chen Hsu, Shih-Pei Huang, Wei-Chien Weng, Yu-Hsiang Kuo, Prof. Dr. Chi-Kung Ni
doi.org/10.1002/cbic.201900228

Dynamic Synthetic Cells Based on Liquid-Liquid Phase Separation

1 August, 2019 - 00:00

Emergence of autonomous protocells on the early Earth: Liquid-liquid phase separation processes in water offer great promise for the bottom-up assembly of synthetic cell models based on membrane-free microdroplets. This Minireview highlights the dynamic properties of such liquid-like droplets that make them relevant models for approaching the dynamic complexity of living matter.

[Minireviews]
Dr. Nicolas Martin
doi.org/10.1002/cbic.201900183

Aqueous-Phase Selective Oxidation of Methane with Oxygen over Iron Salts and Pd/C in the Presence of Hydrogen

1 August, 2019 - 00:00

Methane-to-Oxygenates: Aqueous-phase selective oxidation of methane with molecular oxygen under mild conditions was successfully demonstrated using iron salts and Pd/C in the presence of molecular hydrogen

[Communications]
Jongkyu Kang, Prof. Eun Duck Park
doi.org/10.1002/cctc.201900919

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

1 August, 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 August, 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 August, 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 August, 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 August, 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 August, 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 August, 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

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