bluuebunny/crossref_metadata_2025_split huggingface dataset:
Highly Tin‐Selective Stille Coupling: Synthesis of a Polymer Containing a Stannole in the Main Chain
Authors: Linshoeft Julian , Baum Evan J. , Hussain Andreas , Gates Paul J. , Näther Christian , Staubitz Anne 
Published: September 2014

AbstractThe incorporation of heavier Group 14 element heteroles into semiconducting polymers leads to unusual optoelectronic properties. However, polymers containing stannoles have not been accessible to date. We report a synthetic route to a well‐defined, stannole‐containing polymer, the first example of this class of π‐conjugated polymers. This route was made possible by developing difunctionalized stannole monomers and highly tin‐selective Stille coupling reactions that leave the tin in the stannole untouched. Compared to poly(3‐n‐hexylthiophene), the resulting polymer displays a remarkable bathochromic shift in its absorption.
A Heterometallic FeII–DyIII Single‐Molecule Magnet with a Record Anisotropy Barrier
Authors: Liu Jun‐Liang , Wu Jie‐Yi , Chen Yan‐Cong , Mereacre Valeriu , Powell Annie K. , Ungur Liviu , Chibotaru Liviu F. , Chen Xiao‐Ming , Tong Ming‐Liang 
Published: September 2014

AbstractA record anisotropy barrier (319 cm−1) for all d‐f complexes was observed for a unique FeII‐DyIII‐FeII single‐molecule magnet (SMM), which possesses two asymmetric and distorted FeII ions and one quasi‐D5h DyIII ion. The frozen magnetization of the DyIII ion leads to the decreased FeII relaxation rates evident in the Mössbauer spectrum. Ab initio calculations suggest that tunneling is interrupted effectively thanks to the exchange doublets.
Substitution‐Inert Trinuclear Platinum Complexes Efficiently Condense/Aggregate Nucleic Acids and Inhibit Enzymatic Activity
Authors: Malina Jaroslav , Farrell Nicholas P. , Brabec Viktor 
Published: September 2014

AbstractThe trinuclear platinum complexes (TriplatinNC‐A [{Pt(NH3)3}2‐μ‐{trans‐Pt(NH3)2(NH2(CH2)6NH2)2}]6+, and TriplatinNC [{trans‐Pt(NH3)2(NH2(CH2)6NH3+)}2‐μ‐{trans‐Pt(NH3)2(NH2(CH2)6NH2)2}]8+) are biologically active agents that bind to DNA through noncovalent (hydrogen bonding, electrostatic) interactions. Herein, we show that TriplatinNC condenses DNA with a much higher potency than conventional DNA condensing agents. Both complexes induce aggregation of small transfer RNA molecules, and TriplatinNC in particular completely inhibits DNA transcription at lower concentrations than naturally occurring spermine. Topoisomerase I‐mediated relaxation of supercoiled DNA was inhibited by TriplatinNC‐A and TriplatinNC at concentrations which were 60 times and 250 times lower than that of spermine. The mechanisms for the biological activity of TriplatinNC‐A and TriplatinNC may be associated with their ability to condense/aggregate nucleic acids with consequent inhibitory effects on crucial enzymatic activities.
Potential role of nanofillers as compatibilizers in immiscible PLA/LDPE Blends
Authors: Vrsaljko Domagoj , Macut Dejan , Kovačević Vera 
Published: September 2014

ABSTRACTThis article describes the use of commercial silica (SiO2) and calcium carbonate (CaCO3) nanofillers as compatibilizers in immiscible polylactide/low‐density polyethylene (PLA/LDPE) blends. The general aim of the study was to investigate the possibilities of replacing standard commodity plastics such as LDPE based on non‐renewable mineral oil resources with the biodegradable renewable polymer PLA in compatibilized PLA/LDPE blends for use in the packaging industry. The calculations of the minimal interfacial energy and optimal wetting abilities indicated that SiO2 filler was a better potential compatibilizer than CaCO3 for a given PLA/LDPE blend. This was due to its preferential localization at the interface. The significantly improved morphology of the ternary PLA/LDPE/SiO2 blend was found to present an increased strength, toughness, and crystallinity. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41414.
Effects of surface modification of carbon nanofibers on the mechanical properties of polyamide 1212 composites
Authors: Cai Ziqing , Meng Xiaoyu , Zhang Xiaocan , Cui Lishan , Zhou Qiong 
Published: September 2014

ABSTRACTIn this study, the effects of carbon nanofiber (CNF) surface modification on mechanical properties of polyamide 1212 (PA1212)/CNFs composites were investigated. CNFs grafted with ethylenediamine (CNF‐g‐EDA), and CNFs grafted with polyethyleneimine (CNF‐g‐PEI) were prepared and characterized. The mechanical properties of the PA1212/CNFs composites were reinforced efficiently with addition of 0.3 wt % modified CNFs after drawing. The reinforcing effect of the drawn composites was investigated in terms of interfacial interaction, crystal orientation, crystallization properties and so on. After the surface modification of CNFs, the interfacial adhesion and dispersion of CNFs in PA1212 matrix were improved, especially for CNF‐g‐PEI. The improved interfacial adhesion and dispersion of CNFs in PA1212 matrix was beneficial to reinforcement of the composites. Compared with pure PA1212, improved degree of crystal orientation in the PA1212/CNF‐g‐PEI (CNF‐g‐EDA) composites was responsible for reinforcement of mechanical properties after drawing. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41424.
Influence of compositions and polymerization processes on morphologies, molar mass distributions, and phase structures of n‐Butyl acrylate–methyl methacrylate copolymers
Authors: Erola Markus O. A. , Suvanto Sari , Pakkanen Tuula T. 
Published: September 2014

ABSTRACTThe target of the research is to examine influence of a polymerization process and monomer ratio on structures and compositions of phases in an emulsion copolymerization of n‐butyl acrylate (BA) and methyl methacrylate (MMA). Emulsion copolymerizations are performed using three different BA/MMA weight ratios (60%/40%, 50%/50%, and 40%/60%) and two different processes, statistical batch and seeded emulsion polymerizations. Phase structures, monomer compositions, and morphological stabilities of copolymers are investigated by differential scanning calorimetry, 1H‐NMR, and scanning electron microscopy. Gel permeation chromatography is used to follow the changes in the molar mass distribution during syntheses. The gel content and backbiting level of end products are measured by extraction and 13C‐NMR, respectively. Copolymerizations give products with a bimodal molar mass distribution and three or two separate phases having different BA/MMA compositions. The morphological stability of particles decreases with the increasing BA fraction in the feed. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41467.
Physical and mechanical properties of the fully interconnected chitosan ice‐templated scaffolds
Authors: Pourhaghgouy Masoud , Zamanian Ali 
Published: September 2014

ABSTRACTPorous chitosan scaffolds were prepared with a freeze‐casting technique with different concentrations, 1.5 and 3 wt %, and also different cooling rates, 1 and 4°C/min. The pore morphology, porosity, pore size, mechanical properties, and water absorption characteristics of the scaffolds were studied. Scanning electron microscopy images showed that the freeze‐cast scaffolds were fully interconnected because of the existence of pores on the chitosan walls in addition to many unidirectionally elongated pores. Increases in the chitosan concentration and freezing rate led to elevations in the thickness of the chitosan walls and reductions in the pores size, respectively. These two results led to the enhancement of the compressive strength from 34 to 110 kPa for the scaffolds that had 96–98% porosity. Also, augmentation of the chitosan concentration and decreases in the freezing rate led to the reduction of the number of pores on the chitosan walls. Furthermore, the volume of water absorption increased with a reduction in the chitosan concentration and cooling rate from 690 to 1020%. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41476.
Polypropylene/silica micro‐ and nanocomposites modified with poly(styrene‐b‐ethylene‐co‐butylene‐b‐styrene)
Authors: Pustak Anđela , Denac Matjaž , Leskovac Mirela , Švab Iztok , Musil Vojko , Šmit Ivan 
Published: September 2014

ABSTRACTThe effects of different silica loadings and elastomeric content on interfacial properties, morphology and mechanical properties of polypropylene/silica 96/4 composites modified with 5, 10, 15, and 20 vol % of poly(styrene‐b‐ethylene‐co‐butylene‐b‐styrene) SEBS added to total composite volume were investigated. Four silica fillers differing in size (nano‐ vs. micro‐) and in surface properties (untreated vs. treated) were chosen as fillers. Elastomer SEBS was added as impact modifier and compatibilizer at the same time. The morphology of ternary polymer composites revealed by light and scanning electron microscopies was compared with morphology predicted models based on interfacial properties. The results indicated that general morphology of composite systems was determined primarily by interfacial properties, whereas the spherulitic morphology of polypropylene matrix was a result of two competitive effects: nucleation effect of filler and solidification effect of elastomer. Tensile and impact strength properties were mainly influenced by combined competetive effects of stiff filler and tough SEBS elastomer. Spherulitic morphology of polypropylene matrix might affect some mechanical properties additionally. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41486.
A designed buried salt bridge modulates heterodimerization of a membrane peptide
Authors: Shinde Sandip , Binder Jennifer K. , Goyal Bhupesh , Woodrum B. , De Munari Sonia , Levitus Marcia , Ghirlanda Giovanna 
Published: September 2014

ABSTRACT:Specific helix–helix interactions underpin the correct assembly of multipass membrane proteins. Here, we show that a designed buried salt bridge mediates heterodimer formation of model transmembrane helical peptides in a pH‐dependent manner. The model peptides bear side chains functionalized with either a carboxylic acid or a primary amine within a hydrophobic segment. The association behavior was monitored by Förster resonance energy transfer, revealing that heterodimer formation is maximized at a pH close to neutrality (pH 6.5), at which each peptide is found in a charged state. In contrast, heterodimerization is disfavored at low and high values of pH, because either the carboxylic acid or the primary amine is present in its neutral state, thus preventing the formation of a salt bridge. These findings provide a blueprint for the design and modulation of protein–protein interactions in membrane proteins. © 2014 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 102: 437–443, 2014.
Solidification of floating organic drop liquid‐phase microextraction cell fishing with gas chromatography–mass spectrometry for screening bioactive components from Amomum villosum Lour
Authors: Xue Xue , Yang Depo , Wang Dongmei , Xu Xinjun , Zhu Longping , Zhao Zhimin 
Published: September 2014

AbstractIn this study, a novel solidification of floating organic drop liquid‐phase microextraction cell fishing with gas chromatography–mass spectrometry (SFOD‐LPME‐CF‐GC‐MS) method was established and used to screen, isolate and analyze bioactive components from Amomum villosum Lour. extract. Through comparision of its effect on the models of normal cell and inflammatory cells, anti‐inflammatory active components of essential oil from A. villosum Lour. were readily screened, and the components obtained are in agreement with related pharmacological articles. SFOD‐LPME‐CF‐GC‐MS was used to analyze the interaction of A. villosum Lour. extracts with normal and lipopolysaccharide‐stimulated RAW264.7 macrophage cells. The effect of A. villosum Lour. essential oil extracts in the LPS‐stimulated RAW264.7 model were also assessed in terms of cytotoxicity and nitric oxide production as an indication of bioactivity. Three potentially bioactive components were identified, demonstrating that SFOD‐LPME‐CF‐GC‐MS can be used successfully in the drug‐screening process. This approach avoids the requirement for protein precipitation, but more importantly, generates a high concentration ratio, allowing analysis of trace components in traditional Chinese medicines. SFOD‐LPME‐CF‐GC‐MS is a simple, fast, effective and reliable method for the screening and analysis of bioactive components, and it can be extended to screen other bioactive components from TCMs. Copyright © 2014 John Wiley & Sons, Ltd.
Immobilization of Proteins in their Physiological Active State at Functionalized Thiol Monolayers on ATR‐Germanium Crystals
Authors: Schartner Jonas , Gavriljuk Konstantin , Nabers Andreas , Weide Philipp , Muhler Martin , Gerwert Klaus , Kötting Carsten 
Published: September 2014

AbstractProtein immobilization on solid surfaces has become a powerful tool for the investigation of protein function. Physiologically relevant molecular reaction mechanisms and interactions of proteins can be revealed with excellent signal‐to‐noise ratio by vibrational spectroscopy (ATR‐FTIR) on germanium crystals. Protein immobilization by thiol chemistry is well‐established on gold surfaces, for example, for surface plasmon resonance. Here, we combine features of both approaches: a germanium surface functionalized with different thiols to allow specific immobilization of various histidine‐tagged proteins with over 99 % specific binding. In addition to FTIR, the surfaces were characterized by XPS and fluorescence microscopy. Secondary‐structure analysis and stimulus‐induced difference spectroscopy confirmed protein activity at the atomic level, for example, physiological cation channel formation of Channelrhodopsin 2.
Nanoarchitectured Graphene‐Based Supercapacitors for Next‐Generation Energy‐Storage Applications
Authors: Salunkhe Rahul R. , Lee Ying‐Hui , Chang Kuo‐Hsin , Li Jing‐Mei , Simon Patrice , Tang Jing , Torad Nagy L. , Hu Chi‐Chang , Yamauchi Yusuke 
Published: September 2014

AbstractTremendous development in the field of portable electronics and hybrid electric vehicles has led to urgent and increasing demand in the field of high‐energy storage devices. In recent years, many research efforts have been made for the development of more efficient energy‐storage devices such as supercapacitors, batteries, and fuel cells. In particular, supercapacitors have great potential to meet the demands of both high energy density and power density in many advanced technologies. For the last half decade, graphene has attracted intense research interest for electrical double‐layer capacitor (EDLC) applications. The unique electronic, thermal, mechanical, and chemical characteristics of graphene, along with the intrinsic benefits of a carbon material, make it a promising candidate for supercapacitor applications. This Review focuses on recent research developments in graphene‐based supercapacitors, including doped graphene, activated graphene, graphene/metal oxide composites, graphene/polymer composites, and graphene‐based asymmetric supercapacitors. The challenges and prospects of graphene‐based supercapacitors are also discussed.
Selectfluor and NFSI exo‐Glycal Fluorination Strategies Applied to the Enhancement of the Binding Affinity of Galactofuranosyltransferase GlfT2 Inhibitors
Authors: Dumitrescu Lidia , Eppe Guillaume , Tikad Abdellatif , Pan Weidong , Bkassiny Sandy El , Gurcha Sudagar S. , Ardá Ana , Jiménez‐Barbero Jesús , Besra Gurdyal S. , Vincent Stéphane P. 
Published: September 2014

AbstractTwo complementary methods for the synthesis of fluorinated exo‐glycals have been developed, for which previously no general reaction had been available. First, a Selectfluor‐mediated fluorination was optimized after detailed analysis of all the reaction parameters. A dramatic effect of molecular sieves on the course of the reaction was observed. The reaction was generalized with a set of biologically relevant furanosides and pyranosides. A second direct approach involving carbanionic chemistry and the use of N‐fluorobenzenesulfonimide (NFSI) was performed and this method gave better diastereoselectivities. Assignment of the Z/E configuration of all the fluorinated exo‐glycals was achieved based on the results of HOESY experiments. Furthermore, fluorinated exo‐glycal analogues of UDP‐galactofuranose were prepared and assayed against GlfT2, which is a key enzyme involved in the cell‐wall biosynthesis of major pathogens. The fluorinated exo‐glycals proved to be potent inhibitors as compared with a series of C‐glycosidic analogues of UDP‐Galf, thus demonstrating the double beneficial effect of the exocyclic enol ether functionality and the fluorine atom.
Palladium–N‐Heterocyclic Carbene (NHC)‐Catalyzed Asymmetric Synthesis of Indolines through Regiodivergent C(sp3)H Activation: Scope and DFT Study
Authors: Katayev Dmitry , Larionov Evgeny , Nakanishi Masafumi , Besnard Céline , Kündig E. Peter 
Published: September 2014

AbstractInvited for the cover of this issue is the group of E. Peter Kündig at the University of Geneva. The cover illustrates the regiodivergent reaction taken by two enantiomers when subjected to a chiral Pd(N‐heterocyclic carbene) catalyst. The combination of a divergent reaction with an enantioselective CH functionalization makes for fascinating chemistry. Read the full text of the article at 10.1002/chem.201403985.
Total Synthesis of the Anti‐inflammatory and Pro‐resolving Lipid Mediator MaR1n−3 DPA Utilizing an sp3–sp3 Negishi Cross‐Coupling Reaction
Authors: Tungen Jørn Eivind , Aursnes Marius , Dalli Jesmond , Arnardottir Hildur , Serhan Charles Nicholas , Hansen Trond Vidar 
Published: September 2014

AbstractInvited for the cover of this issue are members of the groups of Professors Trond V. Hansen, University of Oslo and Charles N. Serhan, Brigham & Women’s Hospital, Harvard Institute of Medicine, Harvard Medical School. The image depicts the successful application of an sp3–sp3 Pd‐catalyzed Negishi cross‐coupling reaction using the PEPPSI™‐IPr catalyst. Read the full text of the article at 10.1002/chem.201404721.
ChemInform Abstract: Quaternary Arsenides ACdGeAs2 (A: K, Rb) Built of Ethane‐Like Ge2As6 Units.
Authors: Khatun Mansura , Stoyko Stanislav S. , Mar Arthur 
Published: September 2014

AbstractKCdGeAs2 (I) and RbCdGeAs2 (II) are prepared by solid state reactions of stoichiometric mixtures of the elements (alumina crucible in evacuated silica tube, 650 °C (I) and 600 °C (II), 10 d).
ChemInform Abstract: Strontium Vanadium Oxide—Hydrides: “Square‐Planar” Two‐Electron Phases.
Authors: Denis Romero Fabio , Leach Alice , Moeller Johannes S. , Foronda Francesca , Blundell Stephen J. , Hayward Michael A. 
Published: September 2014

AbstractSrVO2H, Sr2VO3H, and Sr3V2O5H2 are prepared by topochemical replacement of oxide ions in SrVO3, Sr2VO4, and Sr3V2O7, resp., by hydride ions using CaH2 (600—630 °C).
ChemInform Abstract: Synthesis and Electrochemical Performance of the Orthorhombic Li2Fe(SO4)2 Polymorph for Li‐Ion Batteries.
Authors: Lander Laura , Reynaud Marine , Rousse Gwenaelle , Sougrati Moulay T. , Laberty‐Robert Christel , Messinger Robert J. , Deschamps Michael , Tarascon Jean‐Marie 
Published: September 2014

AbstractA new orthorhombic polymorph of Li2Fe(SO4)2 is prepared by high‐energy ball milling of stoichiometric amounts of FeSO4 and Li2SO4 which results in well crystallized samples without noticeable amounts of the precursors after 5—10 h.
ChemInform Abstract: Oxidizing Elemental Platinum with Oleum under Harsh Conditions: The Unique Tris(disulfato)platinate(IV) [Pt(S2O7)3]2‐ Anion.
Authors: Bruns Joern , Kluener Thorsten , Wickleder Mathias S. 
Published: September 2014

AbstractDirect oxidation of elemental Pt by oleum (65% SO3) in the presence of BaCO3 yields yellow single crystals of Ba[Pt(S2O7)3] (H2SO4)0.5 (H2S2O7)0.5 (sealed glass ampoule, 160 °C).
ChemInform Abstract: A Highly Efficient and Broadly Applicable Cationic Gold Catalyst.
Authors: Malhotra Deepika , Mashuta Mark S. , Hammond Gerald B. , Xu Bo 
Published: September 2014

AbstractThe title catalyst promotes intra‐ and intermolecular X—H (X=C, N, O) addition of alkynes and cycloisomerizations at low‐level loading and with high turnover numbers at room temperature or slightly elevated temperatures.
ChemInform Abstract: Merging Aerobic Oxidation and Enamine Catalysis in the Asymmetric α‐Amination of β‐Ketocarbonyls Using N‐Hydroxycarbamates as Nitrogen Sources.
Authors: Xu Changming , Zhang Long , Luo Sanzhong 
Published: September 2014

AbstractThe title process includes the aerobic oxidation of N‐hydroxycarbamates to give nitrosocarbonyl intermediates which react with β‐keto compounds in the presence of an optically active amine catalyst.
ChemInform Abstract: A Facile Synthesis of β‐Amino Carbonyl Compounds Through an Aza‐Michael Addition Reaction under Solvent‐Free Conditions.
Authors: Huang Chao , Yin Yanqing , Guo Jiahui , Wang Jiong , Fan Baomin , Yang Lijuan 
Published: September 2014

AbstractPrimary and secondary aliphatic amines react at room temperature with oxanorbornene (I) to yield bicyclic adducts (III) whereas anilines produce significant amounts of (Z)‐β‐enamine esters (VI) as side products.
ChemInform Abstract: Copper‐Mediated Trifluoromethylation of Aryl‐, Heteroaryl‐, and Vinyltrifluoroborates with Langlois′ Reagent.
Authors: Dubbaka Srinivas Reddy , Salla Manohar , Bolisetti Raghu , Nizalapur Shashidhar 
Published: September 2014

AbstractThe title compounds are obtained using less expensive and stable sodium trifluoromethanesulfinate as the CF3‐source.
ChemInform Abstract: Highly Efficient Direct Aerobic Oxidative Esterification of Cinnamyl Alcohol with Alkyl Alcohols Catalyzed by Gold Nanoparticles Incarcerated in a Nanoporous Polymer Matrix: A Tool for Investigating the Role of the Polymer Host.
Authors: Buonerba Antonio , Noschese Annarita , Grassi Alfonso 
Published: September 2014

AbstractDirect aerobic oxidation and oxidative esterification of cinnamyl alcohol is achieved using gold nanoparticles supported in a semicrystalline multi‐block polystyrene‐co‐cis‐1,4‐polybutadiene matrix as the catalyst (all yields determined by GC‐analysis using anisole as an internal standard).
ChemInform Abstract: Facile Synthesis of Hybrid Core—Shell Nanospheres for the Asymmetric Transfer Hydrogenation of Aromatic Ketones.
Authors: Wei Juan , Zhang Xiaomin , Zhang Xiaoming , Zhao Yaopeng , Li Ruixiang , Yang Qihua 
Published: September 2014

AbstractAryl methyl ketones and α,β‐unsaturated ketones are reduced stereoselectively to secondary alcohols in the presence of Rh‐functionalized hybrid core—shell nanospheres.
ChemInform Abstract: Selective Transfer Hydrogenation and Hydrogenation of Ketones Using a Defined Monofunctional (P^N(Bn)^N(Bn)^P)—RuIIComplex.
Authors: Hsu Shih‐Fan , Plietker Bernd 
Published: September 2014

AbstractThe applied Ru‐complex represents one of the few highly active catalysts reported for transfer hydrogenation as well as hydrogenation of ketones.
ChemInform Abstract: DDQ‐Mediated Oxidation of sp3 C—H Bond for the Direct Synthesis of Vicinal Tricarbonyl Compounds.
Authors: Wang Zheng‐Lin , An Xing‐Lan , Ge Li‐Shi , Jin Jing‐Hai , Luo Xiaoyan , Deng Wei‐Ping 
Published: September 2014

AbstractPurification of the aliphatic tricarbonyl compound obtained after conversion (V) fails, thus requiring further transformation to the quinoline (VII).
ChemInform Abstract: Ester‐Directed Selective Olefination of Acrylates by Rhodium Catalysis.
Authors: Feng Ruokun , Yu Wenlong , Wang Kai , Liu Zhanxiang , Zhang Yuhong 
Published: September 2014

AbstractVarious styrenes [(I) and (VIII)] react with acrylates [(II) and (V)] to give (Z,E)‐1,3‐dienes in high stereoselectivity.
ChemInform Abstract: One‐Pot Synthesis of 2‐Substituted Benzo[b]furans via Pd—Tetraphosphine Catalyzed Coupling of 2‐Halophenols with Alkynes.
Authors: Zhou Rong , Wang Wei , Jiang Zhi‐jie , Wang Kun , Zheng Xue‐li , Fu Hai‐yan , Chen Hua , Li Rui‐xiang 
Published: September 2014

AbstractA highly efficient catalyst system [PdCl(allyl)2] and tetraphosphine ligand for the one‐pot synthesis of 2‐substituted benzo[b]furans from 2‐halophenols and alkynes is reported.