ChemPhysChem

Cover image for Vol. 15 Issue 2

February 3, 2014

Volume 15, Issue 2

Pages 233–381

  1. Cover Pictures

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Communications
    7. Articles
    1. You have free access to this content
      Cover Picture: Fast Gradient-Encoded CEST Spectroscopy of Hyperpolarized Xenon (ChemPhysChem 2/2014) (page 233)

      Jörg Döpfert, Dr. Christopher Witte and Dr. Leif Schröder

      Version of Record online: 27 JAN 2014 | DOI: 10.1002/cphc.201490005

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      The cover picture shows how magnetic field gradients can be utilized to drastically speed up the acquisition of xenon-129 Hyper-CEST spectra. The gradient G encodes the frequency along a spatial dimension x. This allows L. Schröder et al. to record entire CEST spectra (depicted as clouds of smoke) of a cryptophane-A-based model contrast agent after a single saturation preparation, reducing the total acquisition time by a factor of up to 60, as shown on p. 261.

    2. You have free access to this content
      Inside Cover: Seeding Molecular Rotators on a Passivated Silicon Surface (ChemPhysChem 2/2014) (page 234)

      Dr. Oliver Guillermet, Dr. Ather Mahmood, Dr. Jianshu Yang, Dr. Jorge Echeverria, Judicael Jeannoutot, Dr. Sebastien Gauthier, Dr. Christian Joachim, Dr. Frederic Chérioux and Prof. Dr. Frank Palmino

      Version of Record online: 27 JAN 2014 | DOI: 10.1002/cphc.201490006

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      Artistic representation of thermally activated rotation of pentaphenylbenzene molecules trapped in hexagonal nanopores of a supramolecular network on a SiB(111) surface, suggesting the achievement of molecular machines on semiconducting surfaces, as detailed by F. Palmino et al. on p. 271.

  2. Graphical Abstract

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Communications
    7. Articles
  3. News

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Communications
    7. Articles
  4. Minireview

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Communications
    7. Articles
    1. The Non-Ergodic Nature of Internal Conversion (pages 249–259)

      Dr. Theis I. Sølling, Dr. Thomas S. Kuhlman, Anne B. Stephansen, Liv B. Klein and Dr. Klaus B. Møller

      Version of Record online: 27 DEC 2013 | DOI: 10.1002/cphc.201300926

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      Spotlight on energy localization: Coupling of electronic states by specific vibrational degrees of freedom leads to ultrafast internal conversion in a range of different molecular systems. The electronic structure defines the potential energy surfaces, but it is the nuclear dynamics that restricts and determines what parts of the surfaces will be visited during the transition processes (see picture).

  5. Communications

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Communications
    7. Articles
    1. Fast Gradient-Encoded CEST Spectroscopy of Hyperpolarized Xenon (pages 261–264)

      Jörg Döpfert, Dr. Christopher Witte and Dr. Leif Schröder

      Version of Record online: 10 JAN 2014 | DOI: 10.1002/cphc.201300888

      Thumbnail image of graphical abstract

      Breaking speed limits: The acquisition of xenon-129 Hyper-CEST spectra is drastically accelerated by utilizing gradients to encode the chemical shift dimension (see picture). The signal is increased by using repeated spin-echo refocussing. The additional application of a variable flip angle makes the experiment independent from a constant Xe redelivery.

    2. Formation of “Quasi” Contact or Solvent-separated Ion Pairs in the Local Environment of Probe Molecules Dissolved in Ionic Liquids (pages 265–270)

      Matthias Strauch, Dr. Christian Roth, Falk Kubatzki and Prof. Dr. Ralf Ludwig

      Version of Record online: 8 JAN 2014 | DOI: 10.1002/cphc.201300797

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      Configuration changes: The change from “quasi” contact to “quasi” solvent-separated ion-pair configuration in the local environment of a probe molecule in ionic liquids depends on the interaction strength of the chosen anions. Ion speciation in these Coulomb fluids is shown by combining infrared spectroscopy, density functional theory calculations, and natural bond orbital analysis using a low-self-clustering probe molecule.

  6. Articles

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Communications
    7. Articles
    1. Seeding Molecular Rotators on a Passivated Silicon Surface (pages 271–275)

      Dr. Oliver Guillermet, Dr. Ather Mahmood, Dr. Jianshu Yang, Dr. Jorge Echeverria, Judicael Jeannoutot, Dr. Sebastien Gauthier, Dr. Christian Joachim, Dr. Frederic Chérioux and Prof. Dr. Frank Palmino

      Version of Record online: 27 JAN 2014 | DOI: 10.1002/cphc.201301015

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      Round the roundabout: Thermally activated rotation of single molecules adsorbed on a silicon-based surface between 77 and 150 K is successfully achieved. This phenomenon relies on a nanoporous supramolecular network, acting as a template to seed periodic molecule rotors on the surface.

    2. Exchange of Methyl- and Azobenzene-Terminated Alkanethiols on Polycrystalline Gold Studied by Tip-Enhanced Raman Mapping (pages 276–282)

      Dr. Gennaro Picardi, Dr. Agata Królikowska, Dr. Ryohei Yasukuni, Dr. Marc Chaigneau, Dr. Marie Escude, Dr. Véronique Mourier, Dr. Christophe Licitra and Prof. Razvigor Ossikovski

      Version of Record online: 20 JAN 2014 | DOI: 10.1002/cphc.201300918

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      Sub-micrometer Raman imaging: Distribution of azobenzene thiol and decanethiol molecules in a self-assembled monolayer formed by subsequent adsorption on polycrystalline gold substrates is evidenced by tip-enhanced Raman spectroscopic (TERS) imaging with <50 nm pixel size. The images show that molecular replacement takes place first at grain boundaries.

    3. Phosphatation of Zeolite H-ZSM-5: A Combined Microscopy and Spectroscopy Study (pages 283–292)

      Hendrik E. van der Bij, Dr. Luis R. Aramburo, Dr. Bjørnar Arstad, Dr. James J. Dynes, Dr. Jian Wang and Prof. Dr. Bert M. Weckhuysen

      Version of Record online: 8 JAN 2014 | DOI: 10.1002/cphc.201300910

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      Tried and tested: The effect of phosphorus modification of zeolite H-ZSM-5 greatly depends on the applied phosphatation route. By using a multi-pronged spectroscopic approach it is established that phosphatation of H-ZSM-5 promotes zeolite aggregation, external phosphorus deposits, and causes no dealumination. Phosphatation of pre-steamed H-ZSM-5 gives rise to the formation of an extra-framework crystalline tridymite AlPO4 phase.

    4. Exchanged Cations and Water during Reactions in Polypyrrole Macroions from Artificial Muscles (pages 293–301)

      Dr. Laura Valero, Prof. Dr. Toribio F. Otero and José G. Martínez

      Version of Record online: 20 JAN 2014 | DOI: 10.1002/cphc.201300878

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      Putting some muscle into it: Bending bilayer (conducting polymer/tape) artificial muscles are used to quantify cations and solvent molecules exchanged by the dense conducting-polymer gel along the reactions driving muscle movement. The artificial muscles are faradaic polymeric motors, and both the rate of movement and the position have a linear relationship with the driving current and the consumed charge.

    5. Small-Angle Neutron Scattering Studies of Hemoglobin Confined Inside Silica Tubes of Varying Sizes (pages 302–309)

      Soumit S. Mandal, Dr. Viviana Cristiglio, Dr. Peter Lindner and Prof. Aninda J. Bhattacharyya

      Version of Record online: 12 DEC 2013 | DOI: 10.1002/cphc.201300863

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      Packing proteins into tubes: The dimensions of the host have a significant influence on the structure of confined proteins. Small-angle neutron scattering reveals considerable aggregation within small diameter tubes (≈20 nm), and a transition from an aggregated to non-aggregated state is observed within larger tubes (≥100 nm).

    6. Lifetime Shortening and Fast Energy-Tansfer Processes upon Dimerization of a A-π-D-π-A Molecule (pages 310–319)

      Dr. Elisabetta Collini, Dr. Luca Bolzonello, Dr. Mirco Zerbetto, Prof. Camilla Ferrante, Dr. Norberto Manfredi and Prof. Alessandro Abbotto

      Version of Record online: 21 NOV 2013 | DOI: 10.1002/cphc.201300694

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      A dark mistery: Time-resolved experiments reveal a distinct change in the decay dynamic of an A-π-D-π-A molecule upon formation of a covalently linked non-conjugated dimer. The faster decay observed in the dimer is attributed to a dark state, which is presumably associated with charge delocalization between the two multipolar units.

    7. Spatially Resolved Confocal Resonant Raman Microscopic Analysis of Anode-Grown Geobacter sulfurreducens Biofilms (pages 320–327)

      Nikolai Lebedev, Sarah M. Strycharz-Glaven and Leonard M. Tender

      Version of Record online: 8 JAN 2014 | DOI: 10.1002/cphc.201300984

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      Confocal resonance Raman microscopy is applied to study anode-grown Geobacter sulfurreducens biofilms with spatial resolution. The results confirm the existence of an intra-biofilm redox gradient, which is required to drive electron transport toward the anode surface by electron hopping via cytochromes.

    8. The Geometric Structure of Silver-Doped Silicon Clusters (pages 328–336)

      Yejun Li, Prof. Jonathan T. Lyon, Alex P. Woodham, Dr. André Fielicke and Prof. Ewald Janssens

      Version of Record online: 8 JAN 2014 | DOI: 10.1002/cphc.201300944

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      Coining it in: The geometric structures of SinAg+ clusters are studied by infrared multiple photon dissociation in combination with density functional theory computations (see picture). The SinAg+ (n=6–15) clusters all have exohedral structures and the Ag dopant prefers to adsorb to the Si cluster at a low coordinated position.

    9. Tunable Surface-Enhanced Raman Scattering from High-Density Gold Semishell Arrays with Controllable Dimensions (pages 337–343)

      Xianzhong Lang, Dr. Jiaqi Li, Xiaoguang Luo, Yan Zhang, Yin Yin and Prof. Teng Qiu

      Version of Record online: 27 DEC 2013 | DOI: 10.1002/cphc.201300913

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      Tunable semishells: A convenient reproducible technique is reported for the fabrication of high-density gold semishell arrays by direct patterning on gold/polymer bilayer structures as tunable, robust, and cost-efficient surface-enhanced Raman-scattering substrates.

    10. The Influence of N-doped Carbon Materials on Supported Pd: Enhanced Hydrogen Storage and Oxygen Reduction Performance (pages 344–350)

      Dr. Xiang-Kai Kong, Prof. Qian-Wang Chen and Zheng-Yan Lun

      Version of Record online: 16 JAN 2014 | DOI: 10.1002/cphc.201300907

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      Good support! N-doping can change the electronic states of carbon materials, leading to stronger attractive interactions with the supported Pd catalysts.

    11. Tetracyanoquinodimethane Reduction by Complexed Guanidinyl-Functionalized Aromatic Compounds (pages 351–365)

      Hendrik Herrmann, Alexandra Ziesak, Ute Wild, Simone Leingang, David Schrempp, Norbert Wagner, Prof. Dr. Johannes Beck, Dr. Elisabeth Kaifer, Prof. Dr. Hubert Wadepohl and Prof. Dr. Hans-Jörg Himmel

      Version of Record online: 8 JAN 2014 | DOI: 10.1002/cphc.201300862

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      Mild reduction: Semiconducting materials with extended π stacking are synthesized by tetracyanoquinodimethane reduction with dicationic complexes of guanidinyl-functionalized aromatic compounds. The structures and electronic properties of the materials are analyzed by a number of techniques.

    12. Bifunctional Reduced Graphene Oxide/V2O5 Composite Hydrogel: Fabrication, High Performance as Electromagnetic Wave Absorbent and Supercapacitor (pages 366–373)

      Dr. Hui Zhang, Prof. Anjian Xie, Dr. Cuiping Wang, Dr. Haisheng Wang, Prof. Yuhua Shen and Prof. Xingyou Tian

      Version of Record online: 6 DEC 2013 | DOI: 10.1002/cphc.201300822

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      Beyond graphene: A novel and bifunctional 3D composite hydrogel containing reduced graphene-oxide nanosheets and V2O5 nanobelts is presented. This bifunctional material exhibits excellent properties as electromagnetic wave absorbent and can also be used as a supercapacitor for a two-electrode system delivering a high specific capacitance of about 320 F g−1.

    13. A Strategy to Synthesize Hollow Micro/Nanospheres with Tunable Shell Thickness (pages 374–381)

      Dr. Gongzheng Yang, Dr. Hao Cui and Prof. Chengxin Wang

      Version of Record online: 27 DEC 2013 | DOI: 10.1002/cphc.201300783

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      So simple! A one-step direct templating method is developed to synthesize hollow carbon and sandwich-like ZnO/C/ZnO micro/nanospheres. The characteristics and shell thickness of the final products can be controlled by simply adjusting the reaction temperature.

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