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Articles from Wiley

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

Intermolecular London Dispersion Interactions of Azobenzene Switches for Tuning Molecular Solar Thermal Energy Storage Systems

12 agosto, 2019 - 00:00

Interact and tune: The performance of molecular solar thermal energy storage system (MOST) depends i.a. on the amount of energy stored. Herein it could be shown that intermolecular attractive London dispersion interactions stabilize the (E)-isomer in bisazobenzene linked by different alkyl bridges. This leads to an increased storage energy per azo-unit of more than 3 kcal/mol compared to the parent azobenzene.

[Communications]
Anne Kunz, Andreas H. Heindl, Dr. Ambra Dreos, Zhihang Wang, Prof. Dr. Kasper Moth-Poulsen, Dr. Jonathan Becker, Prof. Dr. Hermann A. Wegner
doi.org/10.1002/cplu.201900330

Direct Observation of Photochemical Free Radical Production from the Sunscreen 2-Phenylbenzimidazole-5-Sulfonic Acid via Laser-Interfaced Mass Spectrometry

12 agosto, 2019 - 00:00

That's radical! 2-phenylbenzimidazole-5-sulfonic acid (PBSA) is a common UV filter which is known to exhibit photosensitizing properties. Using novel laser-interfaced mass spectrometry, we directly identify the UV photodegradation products of PBSA, and present evidence that the T1 state, associated with photosensitization, decays with direct free radical production.

[Articles]
Natalie G. K. Wong, Dr. Jacob A. Berenbeim, Dr. Caroline E. H. Dessent
doi.org/10.1002/cptc.201900149

Cyanoborates

12 agosto, 2019 - 00:00

The boron-based molecules, anions, and clusters are applied in selected fields of coordination chemistry and materials science, often related to ionic liquids and polymers …

Read more about the story behind the cover in the Cover Profile and about the research itself in the Minireview by N. V. Ignat'ev and M. Finze.

[Cover Profile]
Nikolai V. Ignat'ev, Maik Finze
doi.org/10.1002/ejic.201900832

Controlling the Photophysics of Aromatic Guests Using a Cyclic Porphyrin Dimer: Synthesis, Structure, and Encapsulation-Mediated “ON-OFF” Switch

12 agosto, 2019 - 00:00

Molecular switch: A cyclic porphyrin dimer has been employed as a molecular container that can efficiently encapsulate aromatic guests (pyrene/anthracene) inside its cavity. Such entrapment inside the cavity completely alters the photophysics of the encapsulated guests.

[Full Papers]
Pritam Mondal, Sayantani Banerjee, Sankar Prasad Rath
doi.org/10.1002/ejic.201900639

Three Fluorinated Trityl Alcohols and their Lithium Salts - Synthesis, Molecular Structures, and Acidity

12 agosto, 2019 - 00:00

Straightforward one-step synthetic procedures resulted in three fluorinated trityl alcohols. Their high acidity and bulkiness, together with organically bound fluorine atoms as extra ligating sites, account for interesting coordination behavior in their lithium salts. The alcohols call for application to the field of Lewis superacids with enormous fluoride ion affinity.

[Full Papers]
Julius F. Kögel, Enno Lork, Märt Lõkov, Elisabeth Parman, Ivo Leito, Alexey Y. Timoshkin, Jens Beckmann
doi.org/10.1002/ejic.201900603

Taming Copper(I) Cyanate and Selenocyanate with N-Heterocyclic Carbenes

12 agosto, 2019 - 00:00

N-heterocyclic carbene adducts of copper(I) cyanate and selenocyanate have been synthesised. The copper(I) cyanate complexes represent the first structurally characterised examples of monomeric copper(I) cyanate complexes.

[Full Papers]
Christopher A. Dodds, Alan R. Kennedy, Ross Thompson
doi.org/10.1002/ejic.201900515

Dinuclear and Trinuclear Complexes of Copper(I) and Silver(I) Supported by a Highly Fluorinated Pyrazolate [3,5-(CF<sub>3</sub>)<sub>2</sub>Pz]<sup>-</sup> and <i>N</i>-Heterocycles

12 agosto, 2019 - 00:00

A range of silver and copper complexes featuring all nitrogen coordination environments have been isolated from the reactions between highly fluorinated silver(I) and copper(I) pyrazolates and aromatic, bidentate N-heterocycles.

[Full Papers]
H. V. Rasika Dias, Himashinie Diyabalanage, Naleen B. Jayaratna, Daniel Shaw, Champika V. Hettiarachchi, Devaborniny Parasar
doi.org/10.1002/ejic.201900719

A Copper Metal-Organic Hydrogel as a Catalyst for SO<sub>2</sub> and CO<sub>2</sub> Fixation under Ambient Conditions

12 agosto, 2019 - 00:00

A copper(II) hydrogel has been synthesized and characterized. The xerogel can be used as a heterogeneous catalyst for the conversion of SO2 1,3,2-dioxathiolane-2-oxides with high diastereoselectivity. The xerogel can also be used for the chemical fixation of CO2.

[Full Papers]
Chandane Kumar Karan, Manish Bhattacharjee
doi.org/10.1002/ejic.201900594

Keggin-Type Polyoxometalate Modified Ag/Graphene Composite Materials for Electrocatalytic Water Oxidation

12 agosto, 2019 - 00:00

Herein, two new Keggin type POM-based Ag-containing H2biim complexes were synthesized and used as precursors for preparation of POM and Ag nanoparticle loaded graphene composite materials, which show good activity and stability for electrocatalytic water oxidation under neutral conditions.

[Full Papers]
Yan Li, Xu-Ran Chang, Xiao-Jing Sang, Jian-Sheng Li, Yu-Hui Luo, Zai-Ming Zhu, Wan-Sheng You
doi.org/10.1002/ejic.201900566

Stabilization of Heteroleptic Heavier Alkaline Earth Metal Complexes with an Encapsulating Dipyrromethene Ligand

12 agosto, 2019 - 00:00

A dipyrromethene ligand with anthracenyl substituents adequately stabilizes complexes with large metal cations like Ba2+ for ligand scrambling. The metal cation is encapsulated in a cavity spanned by the anthracenyl groups effectively preventing dimerization and blocking ligand exchange.

[Full Papers]
Gerd Ballmann, Bastian Rösch, Sjoerd Harder
doi.org/10.1002/ejic.201900743

Half Sandwich Electron Deficient <i>N</i>,<i>N′</i>,<i>N′′</i>-Triarylguanidinatoruthenium(II) Complexes: Syntheses, Reactivity Studies, and Structural Aspects

12 agosto, 2019 - 00:00

[3+2] Cycloaddition reaction of 5 with electron deficient diethylacetylenedicarboxylate afforded guanidinate(1-) complex 9, while the reaction with electron rich bis(diphenylphosphanyl)acetylene afforded guanidinate(2-) complex 10 in good yields. The difference in reactivity was ascribed to the difference in the electron richness of the reacting alkynes.

[Full Papers]
Robin Kumar, Rishabh Ujjval, Natesan Thirupathi
doi.org/10.1002/ejic.201900616

CeMo<sub>2</sub>B<sub>5</sub>: A New Type of Arrangement of Puckered Boron Hexagonal Rings

12 agosto, 2019 - 00:00

CeMo2B5 is a simple metallic system whose bonding architecture is dominated by chains of [Ce2Mo2] clusters with multi-center bonds. The structural, magnetic, electronic transport properties are reported, and the chemical bonding situation is analyzed by theoretical DFT calculations.

[Full Papers]
Sever Flipo, Miroslav Kohout, Friedrich Roth, Tina Weigel, Walter Schnelle, Matej Bobnar, Alim Ormeci, Ulrich Burkhardt, Christoph Hennig, Tilmann Leisegang, Dirk-Carl Meyer, Andreas Leithe-Jasper, Roman Gumeniuk
doi.org/10.1002/ejic.201900411

Au-Cavitand Catalyzed Alkyne-Acid Cyclizations

12 agosto, 2019 - 00:00

Au-Cavitands place a reactive metal center inwardly directed to a well-studied binding pocket. The metal center retains its reactivity, but what role does the pocket play? Specific sized groups that are known guests for cavitands slow the reaction progress of the lactonization of alkynoic acids. Initial kinetic treatment hints of substrate and product inhibition for select R groups.

[Communications]
Tam D. Ho, Michael P. Schramm
doi.org/10.1002/ejoc.201900829

Visible-Light-Mediated Regioselective Allylation, Benzylation, and Silylation of Methylene-Malononitriles via Photoredox-Induced Radical Cation Fragmentation

12 agosto, 2019 - 00:00

Visible-light-mediated regioselevtive allylation, benzylation, and silylation of methylene-malononitriles with silanes have been realized. The reactions proceed via a photoredox-catalyzed σ-C-Si+· or σ-Si-Si+· type radical cation fragmentation.

[Communications]
Rongfang Liu, Shane Pui Mun Chia, Yi Yiing Goh, Han Wen Cheo, Binbin Fan, Ruifeng Li, Rong Zhou, Jie Wu
doi.org/10.1002/ejoc.201900902

Employing α-Diazocarbonyl Compound Chemistry in the Assembly of Medicinally Important Aryl(alkyl)thiolactam Scaffold

12 agosto, 2019 - 00:00

The RhII-catalyzed S-H insertion reaction of α-diazo-γ-butyrolactams provides a straightforward access to α-aryl(alkyl)thiolactams. The same diazo lactams can be easily converted to β-aryl(alkyl)thiolactams through AgI-catalyzed β-hydride shift followed by a sulfa-Michael addition. These two reactions of α-diazo-γ-butyrolactams pave the way toward two medicinally important scaffolds.

[Communications]
Darina Barkhatova, Daniil Zhukovsky, Dmitry Dar'in, Mikhail Krasavin
doi.org/10.1002/ejoc.201900944

Metal-Free Aerobic Oxidative C-O Coupling of C(<i>sp</i><sup>3</sup>)-H with Carboxylic Acids Catalyzed by DDQ and <i>tert</i>-Butyl Nitrite

12 agosto, 2019 - 00:00

A metal-free aerobic oxidative cross-coupling reaction between a benzylic C(sp3)-H bond and a carboxylic acid catalyzed by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone and tert-butyl nitrite has been developed. This protocol provides a mild and efficient route to obtain diarylmethanol esters and phthalides. It can be regarded as a typical example of green chemistry in oxidative C-O coupling.

[Full Papers]
Decheng Pan, Zilong Pan, Zhiming Hu, Meichao Li, Xinquan Hu, Liqun Jin, Nan Sun, Baoxiang Hu, Zhenlu Shen
doi.org/10.1002/ejoc.201900773

An efficient Benzannulation protocol for the synthesis of 9,9-Diphenyl-9<i>H</i>-fluorenols using Intramolecular Allene Friedel-Crafts Annulation

12 agosto, 2019 - 00:00

A one-pot synthesis of 9,9-diphenyl-9H-fluorenols was developed starting from tert-propargyl alcohols and substituted acetylacetones using calcium triflate in good to excellent yields. This benzannulation reaction involves the formation of an allenyl ketone and a subsequent allene Friedel-Crafts annulation.

[Full Papers]
Srinivasarao Yaragorla, P. Rajesh
doi.org/10.1002/ejoc.201900895

A Fusion Method to Develop an Expanded Artificial Genomic RNA Replicable by Qβ Replicase

5 agosto, 2019 - 00:00

Length and functionality: A replication system for RNA-based genetic information consists of artificial genomic RNA (Beta-RNA) that encodes a part of RNA replicase. In this study, expanded long genomic RNAs which are also replicable, are obtained by fusing two replicable RNAs.

[Communications]
Kensuke Ueda, Ryo Mizuuchi, Fumio Matsuda, Dr. Norikazu Ichihashi
doi.org/10.1002/cbic.201900120

Synthesis of β-Chiral Amines by Dynamic Kinetic Resolution of α-Branched Aldehydes Applying Imine Reductases

5 agosto, 2019 - 00:00

From aldehydes to amines: Here, the proof of concept for enzymatic β-chiral secondary amine synthesis via dynamic kinetic resolution (DKR) employing imine reductases is demonstrated.

[Communications]
Philipp Matzel, Sebastian Wenske, Dr. Simon Merdivan, Prof. Dr. Sebastian Günther, Dr. Matthias Höhne
doi.org/10.1002/cctc.201900806

Toolbox of Post-synthetic Mordenite Modification Strategies: Impact on Textural, Acidic and Catalytic Properties

5 agosto, 2019 - 00:00

Which is best? Mordenite is one of the big five zeolites and finds extensive industrial application particularly in petrochemistry. Mordenite features a fascinating structure and its structural and chemical modification allow to impact catalytic outputs. But which post-synthetic modification strategy is the best suited for the generation of particular textural or chemical features in mordenite for a desired catalytic application?

[Full Papers]
Dr. Hussein Issa, Dr. Nourrddine Chaouati, Prof. Joumana Toufaily, Prof. Tayssir Hamieh, Dr. Alexander Sachse, Dr. Ludovic Pinard
doi.org/10.1002/cctc.201900927

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