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Chemistry - A European Journal
Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editor: Neville Compton, Deputy Editors: Anne Deveson, Elisabeth Roedern
Impact Factor: 5.925
ISI Journal Citation Reports © Ranking: 2011: 20/154 (Chemistry Multidisciplinary)
Online ISSN: 1521-3765
Associated Title(s): Angewandte Chemie International Edition, Chemistry – An Asian Journal, ChemistryOpen, ChemBioChem, ChemCatChem, ChemElectroChem, ChemMedChem, ChemPhysChem, ChemPlusChem, ChemSusChem, European Journal of Inorganic Chemistry, European Journal of Organic Chemistry
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| May 16, 2013 ChemPlusChem 5/2013: Like Oil and Water
In the cover article, Martin Pumera et al. use self-propelled biocompatible capsules loaded with various surfactants and compared their influence upon movement of oil droplets. Their findings are expected to have great impact on potential applications of such capsules for environmental clean-up. Also, a report on visualizing hyperconjugation through UV-photoelectron spectroscopy is outlined by Vladimir Ya. Lee et al. Meanwhile, Pierre Frère et al. describe the synthesis as well as the optical, theoretical, electrochemical, X-ray, and electrical characteristics of new thiophene/furan-capped co-oligomers for organic field-effect transistors. May 16, 2013 Full Paper: Synthesis of 1-Substituted Tetrahydroisoquinolines by Lithiation and Electrophilic Quenching Guided by In Situ IR and NMR Spectroscopy and Application to the Synthesis of Salsolidine, Carnegine and Laudanosine
Xiabing Li, Daniele Leonori, Nadeem S. Sheikh, Iain Coldham doi: 10.1002/chem.201301096 May 15, 2013 VIP: The Structural Basis for Optimal Performance of Oligothiophene-Based Fluorescent Amyloid Ligands: Conformational Flexibility is Essential for Spectral Assignment of Diverse Protein AggregatesT. Klingstedt, H. Shirani, K. O. A. Åslund, N. J. Cairns, C. J. Sigurdson, M. Goedert, K. P. R. Nilsson* Luminescent conjugated oligothiophenes (LCOs) have proven to be useful for optical identification of disease-associated protein aggregates. An anionic pentameric LCO was subjected to chemical engineering by either replacing thiophene units with selenophene or phenylene moieties, or alternating the anionic substituents along the thiophene backbone. Replacing the central thiophene ring with a phenyl moiety stopped the detection of nonthioflavinophilic and noncongophilic protein aggregates, as well as the spectral assignment of Aβ and tau aggregates. Overall, this study identified conformational freedom and extended conjugation of the backbone to be crucial determinants for obtaining superior thiophene-based ligands for spectral assignment of disease-associated protein aggregates. Coming soon. May 15, 2013 VIP: Transition-Metal Complexes of a Salen–Fullerene Diad: Redox and Catalytically Active Nanostructures for Delivery of Metals in NanotubesM. A. Lebedeva, T. W. Chamberlain, E. S. Davies, D. Mancel, B. E. Thomas, M. Suyetin, E. Bichoutskaia, M. Schröder,* A. N. Khlobystov* A hybrid nanoscale ligand, salen–C60 (H2L), binds a range of transition-metal cations in close proximity to the fullerene cage to give complexes [M(L)] (M=Mn, Co, Ni, Cu, Zn, Pd), [MCl(L)] (M=Cr, Fe), and [V(O)L]. Coordination of metal cations to salen–C60 introduces tunable optical and redox properties determined both by the fullerene and the transition metal. The presence of the fullerene cage enhances the affinity of these complexes for carbon nanostructures without having a detrimental effect on the catalytic activity of the metal center. This approach shows promise for applications of salen–C60 complexes in heterogeneous catalysis. Coming soon. May 15, 2013 VIP: Sulfur Species in Graphene OxideS. Eigler,* C. Dotzer, F. Hof, W. Bauer, A. Hirsch Graphene oxide (GO) prepared according to Hummers’ protocol contains organosulfate as part of its structure. The organosulfates are covalently bound to GO and are still present after extensive aqueous workup. These organosulfate groups decompose at between 200 and 300°C, whereas inorganic sulfur species decompose above 700°C. Furthermore, the organosulfates are responsible for the chemical properties of the graphene oxide. Therefore, the structural model of graphene oxide was extended to include the presence of organosulfate groups. The identification of organosulfate groups beneath epoxy groups makes new molecular architectures feasible and can be used to explain the properties of GO in various applications. Coming soon. May 10, 2013 Concept: Ribosomally Synthesized and Post-Translationally Modified Peptide Natural Products: New Insights into the Role of Leader and Core Peptides during Biosynthesis
Xiao Yang, Wilfred A. van der Donk doi: 10.1002/chem.201300401 April 30, 2013 Full Paper: Hydrolysis of Tetravalent Cerium for a Simple Route to Nanocrystalline Cerium Dioxide: An In Situ Spectroscopic Study of Nanocrystal Evolution
Atsushi Ikeda-Ohno, Christoph Hennig, Stephan Weiss, Tsuyoshi Yaita, Gert Bernhard doi: 10.1002/chem.201204101 April 24, 2013 Full Paper: Synthesis and Properties of Isobicyclo-DNA
Anna-Barbara Gerber, Christian J. Leumann doi: 10.1002/chem.201300487 April 22, 2013 ChemPlusChem 4/2013: A Novel Minireactor for Direct Fluorination
In the cover article Ingo Krossing et al. describe a unique multiphase minireactor for direct fluorination of ethylene carbonate, propylene carbonate, and closo-K2[B12H12]. Huan-Tsung Chang et al. outline an approach for preparing Se/Te-doped TiO2 nanorods with dominant {100} facets that show improved photocatalytic and antibacterial activity compared to their conventional counterparts. Also included is a report by Anna Corrias et al. on the incorporation of FeCo-SiO2 composite inside the pore structure of SBA-16 silica. The contribution details synthesis and characterization of the pore structure at different treatment temperatures as well as magnetic properties of the nanocomposite. Meanwhile, Emmanuel Allard et al. present the synthesis of clickable poly(amidoamine) fullerodendrimers that contain on one side dendritic units with tert-butyl esters or carboxylic moieties at the periphery and on the other side an alkyne group. Their strategy leads to the design of functional fullerene-rich nanomaterials of interest to materials scientists. March 28, 2013 VIP: The Toxicity of Graphene Oxides: Dependence on the Oxidative Method UsedE. L. K. Chng, M. Pumera* The cytotoxicity of the graphene oxides (GOs) prepared by the four different oxidative treatments (Staudenmaier, Hofmann, Hummers, and Tour) was investigated by measuring the mitochondrial activity in adherent lung epithelial cells (A549) by using viability MTT and WST-8 assays. There is a strong dose-dependent cytotoxic response resulting from all four GO nanomaterials tested after exposure for 24 h, and it is suggested that there is a correlation between the oxygen content/amount of functional groups in GOs and their toxicological behavior. Received March 04, 2013, published online April 29, 2013, DOI: 10.1002/chem.201300824 – read now. March 06, 2013 VIP: Siamese-Twin Porphyrin: A Pyrazole-Based Expanded Porphyrin of Persistent Helical ConformationL. K. Blusch (née Frensch), Y. Hemberger, K. Pröpper, B. Dittrich, F. Witterauf, M. John, G. Bringmann,* C. Brückner,* F. Meyer* The [3+3]-type synthesis of a pyrazole-based expanded porphyrin 1H4, a hexaphyrin analogue named the Siamese-twin porphyrin, and its homobimetallic diamagnetic nickel(II) and paramagnetic copper(II) complexes, 1Ni2 and 1Cu2, is described. The structure of the macrocycle composed of four pyrroles and two pyrazoles, all linked by single carbon atoms, can be interpreted as two conjoined porphyrin-like subunits, with the two opposing pyrazoles acting as the fusion points. Variable-temperature 1D and 2D NMR spectroscopic analyses suggested a conformationally flexible structure for 1H4. NMR and UV/Vis spectroscopic evidence, as well as structural parameters, proved the macrocycle to be non-aromatic, although each half of the molecule is fully conjugated. UV/Vis and NMR spectroscopic titrations of the free base macrocycle with acid showed it to be dibasic. In the complexes, each metal ion is coordinated in a square-planar fashion by a dianionic, porphyrin-like {N4} binding pocket. The solid-state structures of the dication and both metal complexes were elucidated by single-crystal diffractometry. The conformations of the three structures are all similar and strongly twisted, rendering the molecules chiral. The persistent helical twist in the protonated form of the free base and in both metal complexes permitted resolution of these enantiomeric helimers by HPLC on a chiral phase. The absolute stereostructures of 1H62+, 1Ni2, and 1Cu2 were assigned by a combination of experimental electronic circular dichroism (ECD) investigations and quantum-chemical ECD calculations. The synthesis of the first member of this long-sought class of expanded porphyrin-like macrocycles lays the foundation for the study of the cooperativity of the metal centers within their bimetallic complexes. Received December 03, 2012, published online April 09, 2013, DOI: 10.1002/chem.201204296 – read now. February 25, 2013 VIP: Facile Fabrication of Core–Shell-Structured Ag@Carbon and Mesoporous Yolk–Shell-Structured Ag@Carbon@Silica by an Extended Stöber MethodT.-Y. Yang, J. Liu,* Y. Zheng, M. J. Monteiro, S. Z. Qiao* Core–shell-structured Ag,AgBr@resorcinol formaldehyde (RF) polymer spheres were successfully synthesized by an extended Stöber method. After coating a layer of mesoporous silica (meso-SiO2) on the surface, rattle-type Ag,AgBr@meso-SiO2 or yolk–shell-structured Ag@Carbon@meso-SiO2 were selectively obtained by subsequent annealing under a flow of air or N2, respectively. These complex core–shell and yolk–shell spheres with adjustable core and shell functionalities have potential applications in nanocatalysis, drug delivery, and energy conversion and storage. Received February 09, 2013, published online April 15, 2013, DOI: 10.1002/chem.201300523 – read now. | May 16, 2013 May 15, 2013 April 24, 2013 April 22, 2013 March 28, 2013 March 06, 2013 February 25, 2013 January 25, 2013 January 24, 2013 |
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