ChemPhysChem

Cover image for Vol. 14 Issue 2

February 4, 2013

Volume 14, Issue 2

Pages 257–447

  1. Cover Pictures

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. Editors' Selection
    5. News
    6. Review
    7. Concept
    8. Communications
    9. Articles
    1. You have free access to this content
      Cover Picture: Electrochemically Modified Carbon and Chromium Surfaces for AFM Imaging of Double-Strand DNA Interaction with Transposase Protein (ChemPhysChem 2/2013) (page 257)

      Dr. Charles Esnault, Prof. Benoît Chénais, Dr. Nathalie Casse, Dr. Nicolas Delorme, Prof. Guy Louarn and Prof. Jean-François Pilard

      Version of Record online: 28 JAN 2013 | DOI: 10.1002/cphc.201390005

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      A simple route for immobilizing linear DNA double-strands is described on p. 338 by B. Chénais, J.-F. Pilard et al. Surface modification by electrografting of an aryldiazonium salt yields a roughness of 0.2 nm. The low roughness obtained by the modification permits visualization by AFM of dsDNA and complexes of dsDNA with a protein.

    2. You have free access to this content
      Inside Cover: Effect of Molecular Crowding on the Temperature–Pressure Stability Diagram of Ribonuclease A (ChemPhysChem 2/2013) (page 258)

      Yong Zhai and Prof. Dr. Roland Winter

      Version of Record online: 28 JAN 2013 | DOI: 10.1002/cphc.201390006

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      Using high-pressure FT-IR spectroscopic measurements, Y. Zhai and R. Winter show on p. 386 the effect of a macromolecular crowder, dextran, on the temperature–pressure stability diagram of the protein RNase A.

  2. Graphical Abstract

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. Editors' Selection
    5. News
    6. Review
    7. Concept
    8. Communications
    9. Articles
  3. Editors' Selection

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. Editors' Selection
    5. News
    6. Review
    7. Concept
    8. Communications
    9. Articles
  4. News

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. Editors' Selection
    5. News
    6. Review
    7. Concept
    8. Communications
    9. Articles
    1. Hot Hard Science (page 276)

      Version of Record online: 28 JAN 2013 | DOI: 10.1002/cphc.201300036

  5. Review

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. Editors' Selection
    5. News
    6. Review
    7. Concept
    8. Communications
    9. Articles
    1. Halogen Bonding: An Interim Discussion (pages 278–294)

      Prof. Peter Politzer and Dr. Jane S. Murray

      Version of Record online: 9 JAN 2013 | DOI: 10.1002/cphc.201200799

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      To bond or not to bond: The factors governing halogen-bonding interactions, which involve a region of positive electrostatic potential on a covalently bonded halogen and a negative site (see picture), such as the lone pair of a Lewis base, are described. Particularly important is the positive potential, labeled a σ hole, which is an extension of the covalent bond to the halogen.

  6. Concept

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. Editors' Selection
    5. News
    6. Review
    7. Concept
    8. Communications
    9. Articles
    1. Microgel Capsules Tailored by Droplet-Based Microfluidics (pages 295–304)

      Dr. Sebastian Seiffert

      Version of Record online: 6 DEC 2012 | DOI: 10.1002/cphc.201200749

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      Soft microgel particles that encapsulate additives like drugs, catalysts, or living cells can be produced with exquisite control through the use of droplet-based microfluidic templating. Mono- and double-emulsion droplets template these capsules with simple or complex morphologies. In addition, the use of stimuli-sensitive polymers enables on-demand actuation of the capsules.

  7. Communications

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. Editors' Selection
    5. News
    6. Review
    7. Concept
    8. Communications
    9. Articles
    1. Novel Low-Molecular-Weight-Gelator-Based Microcapsules with Controllable Morphology and Temperature Responsiveness (pages 305–310)

      Dr. Ashok R. Patel, Caroline Remijn, Patricia C. M. Heussen, Ruud den Adel and Dr. Krassimir P. Velikov

      Version of Record online: 12 DEC 2012 | DOI: 10.1002/cphc.201200942

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      A new type of microcapsules with controllable morphology is presented. They are based on a low-molecular-weight gelator and can be switched from temperature-stable to temperature-responsive by simply modifying the preparation method.

    2. Electrochemically Controlled Proton-Transfer-Catalyzed Reactions at Liquid–Liquid Interfaces: Nucleophilic Substitution on Ferrocene Methanol (pages 311–314)

      Pekka Peljo, Liang Qiao, Dr. Lasse Murtomäki, Dr. Christoffer Johans, Prof. Hubert H. Girault and Prof. Kyösti Kontturi

      Version of Record online: 6 DEC 2012 | DOI: 10.1002/cphc.201200953

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      The generation of α-ferrocenyl carbocations from ferrocenyl alcohols for SN1 substitution at the water–organic solvent interface is initiated by the transfer of protons into the organic phase. The proton flux, and hence the reaction rate, can be controlled by addition of a suitable “phase-transfer catalyst” anion or by external polarization with a potentiostat, providing a new method for the synthesis of ferrocene derivatives.

  8. Articles

    1. Top of page
    2. Cover Pictures
    3. Graphical Abstract
    4. Editors' Selection
    5. News
    6. Review
    7. Concept
    8. Communications
    9. Articles
    1. You have full text access to this OnlineOpen article
      Significant Cation Effects in Carbon Dioxide–Ionic Liquid Systems (pages 315–320)

      Dr. Oldamur Hollóczki, Zsolt Kelemen, László Könczöl, Dr. Dénes Szieberth, Prof. Dr. László Nyulászi, Dr. Annegret Stark and Prof. Dr. Barbara Kirchner

      Version of Record online: 2 JAN 2013 | DOI: 10.1002/cphc.201200970

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      Roles in solvation: The interactions between CO2 and imidazolium-based ionic liquid (IL) cations are investigated by ab initio molecular dynamics simulations and static quantum chemical calculations. Cation–CO2 dispersion interactions play a structural role in such ILs (see picture), similar to those in the benzene–CO2 system.

    2. Photophysics of Silicon Phthalocyanines in Aqueous Media (pages 321–330)

      Tennyson L. Doane, Chi-Hung Chuang, Andrew Chomas and Dr. Clemens Burda

      Version of Record online: 10 JAN 2013 | DOI: 10.1002/cphc.201200962

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      pH or hydrophobicity? Although many organic photodynamic therapy drugs have proven successful in clinical trials, their hydrophobicity makes assessment of their biological photophysics very difficult. With steady-state and ultrafast spectroscopy, the authors show that for axial ligated silicon phthalocyanines in aqueous media, both the polarity and the pH have drastic effects on their photophysics and functionality as 1O2 sensitizers.

    3. Anchoring Transition Induced by Gelation in a Liquid Crystal System (pages 331–337)

      R. Bhargavi, Geetha G. Nair and S. Krishna Prasad

      Version of Record online: 18 DEC 2012 | DOI: 10.1002/cphc.201200920

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      Obey the jelly: A novel type of anchoring transition (ANT) in a nematic liquid crystal, driven by the physical gelation of the system and manifesting as anomaly in permittivity as well as textural changes (see picture), is described. Occurring in weak-gel situations only, this phenomenon appears to be driven by the ability of gel fibres to compete with the substrate-driven orientation conditions.

    4. Electrochemically Modified Carbon and Chromium Surfaces for AFM Imaging of Double-Strand DNA Interaction with Transposase Protein (pages 338–345)

      Dr. Charles Esnault, Prof. Benoît Chénais, Dr. Nathalie Casse, Dr. Nicolas Delorme, Prof. Guy Louarn and Prof. Jean-François Pilard

      Version of Record online: 4 JAN 2013 | DOI: 10.1002/cphc.201200885

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      Caught by the tip: It is possible to study protein–DNA interactions even with long dsDNA molecules using modified chrome surfaces (see picture). Due to the immobilization of the DNA by one extremity only, the studies of the DNA–protein interactions on the surface are closer to biological reality.

    5. The Boron Conundrum: Which Principles Underlie the Formation of Large Hollow Boron Cages? (pages 346–363)

      Dr. Jules Tshishimbi Muya, Dr. Erwin Lijnen, Prof. Dr. Minh Tho Nguyen and Prof. Dr. Arnout Ceulemans

      Version of Record online: 23 JAN 2013 | DOI: 10.1002/cphc.201200878

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      Hollow boron clusters are optimised by DFT calculations. The picture shows a Schlegel diagram of the most stable B80 hollow cage isomer with all pentagons capped. Capped hexagons and pentagons are in black and grey, empty polygons in white (see picture).

    6. Environmentally Benign and Efficient Ag2S-ZnO Nanowires as Photoanodes for Solar Cells: Comparison with CdS-ZnO Nanowires (pages 364–368)

      Insung Hwang and Dr. Kijung Yong

      Version of Record online: 11 DEC 2012 | DOI: 10.1002/cphc.201200876

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      Different but the same: A low-temperature, facile solution reaction route for the fabrication of quantum-dot-sensitized solar cells (QDSSCs) containing Ag2S-ZnO nanowires (see picture) is presented. Compared to CdS-ZnO QDSSCs, Ag2S-ZnO QDSSCs exhibit a considerably higher short-circuit current density, a strongly enhanced light-harvesting efficiency, but lower open-circuit voltages, resulting in almost the same power-conversion efficiency of 1.2 %.

    7. How to Tickle Spins with a Fourier Transform NMR Spectrometer (pages 369–373)

      Takuya F. Segawa, Dr. Diego Carnevale and Prof. Dr. Geoffrey Bodenhausen

      Version of Record online: 23 DEC 2012 | DOI: 10.1002/cphc.201200858

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      Tickling transitions: When a nuclear magnetic resonance is irradiated with a weak radio-frequency amplitude equation image/(2π)≤J, all connected transitions split. The type of the connectivity can be identified by the line broadening (see picture).

    8. Identifying Multiple Populations from Single-Molecule Lifetime Distributions (pages 374–380)

      Dr. Mark Kastantin and Prof. Daniel K. Schwartz

      Version of Record online: 18 DEC 2012 | DOI: 10.1002/cphc.201200838

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      The time of its life: Artifacts in single-molecule lifetime distributions result from the experimental choice of an image acquisition time. Complementary information in data obtained over a range of acquisition times can be used to construct the true lifetime distribution (see picture), which results in a quantitatively accurate description of heterogeneous dynamic systems.

    9. Hydrogen Dissociation Catalyzed by Carbon-Coated Nickel Nanoparticles: Experiment and Theory (pages 381–385)

      Prof. Anatoliy Ye. Yermakov, Prof. Danil W. Boukhvalov, Dr. Michael A. Uimin, Prof. Ekaterina S. Lokteva, Alexey V. Erokhin and Dr. Nina N. Schegoleva

      Version of Record online: 4 JAN 2013 | DOI: 10.1002/cphc.201200831

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      Wrap it! A novel carbon-based catalytic material is reported based on the combination of experimental measurements and first-principles calculations. A significant acceleration of the hydrogenation of magnesium at room temperature in the presence of nickel nanoparticles wrapped in multilayer grapheme (see picture) is observed.

    10. Effect of Molecular Crowding on the Temperature–Pressure Stability Diagram of Ribonuclease A (pages 386–393)

      Yong Zhai and Prof. Dr. Roland Winter

      Version of Record online: 20 DEC 2012 | DOI: 10.1002/cphc.201200767

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      A poke in the ribs: Pressure unfolding/refolding experiments on RNase A at pH 2 using FT-IR spectroscopy over a wide range of temperatures and pressures in the absence and presence of the macromolecular crowding agent dextran show that its stability is markedly influenced by the crowding agent. The picture shows the temperature–pressure phase diagram of the system.

    11. A Reversible Redox Strategy for SWCNT-Based Supercapacitors Using a High-Performance Electrolyte (pages 394–399)

      Haijun Yu, Prof. Jihuai Wu, Prof. Jianming Lin, Dr. Leqing Fan, Miaoliang Huang, Youzhen Lin, Yan Li, Fuda Yu and Zhaoyuan Qiu

      Version of Record online: 9 JAN 2013 | DOI: 10.1002/cphc.201200816

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      Redox asset: A novel electrolytical system for single-wall carbon nanotubes (SWCNTs) is established, wherein they exhibit pesudocapacitive performance due to the reversible redox process of the redox mediator used. Consequently, supercapacitors based on SWCNT electrodes in this new electrolyte show better electrochemical properties.

    12. Cations in a Molecular Funnel: Vibrational Spectroscopy of Isolated Cyclodextrin Complexes with Alkali Metals (pages 400–407)

      Dr. Francisco Gámez, Dr. Paola Hurtado, Dr. Ana R. Hortal, Prof. Bruno Martínez-Haya, Dr. Giel Berden and Prof. Jos Oomens

      Version of Record online: 13 DEC 2012 | DOI: 10.1002/cphc.201200810

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      Inclusion complexes: Experimental and computational IR spectra of isolated cyclodextrin complexes with alkali cations suggest that the primary face of the substrate is the preferential docking site of the cation.

    13. Substituent Effects on the Structural Features and Nonlinear Optical Properties of the Organic Alkalide Li+(calix[4]pyrrole)Li (pages 408–416)

      Dr. Wei-Ming Sun, Prof. Di Wu, Prof. Ying Li and Prof. Zhi-Ru Li

      Version of Record online: 4 JAN 2013 | DOI: 10.1002/cphc.201200805

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      Polar opposites: Substituent effects on the nonlinear optical properties of the Li+(calix[4]pyrrole)Li alkalide are investigated by density functional theory. The study reveals that electron-donating substituents increase the first hyperpolarizability of Li+(calix[4]pyrrole)Li, whereas electron-withdrawing substituents have the opposite effect (see picture).

    14. You have full text access to this OnlineOpen article
      The Effect of Bacterial Signal Indole on the Electrical Properties of Lipid Membranes (pages 417–423)

      Catalin Chimerel, Dr. Andrew J. Murray, Enno R. Oldewurtel, Dr. David K. Summers and Dr. Ulrich F. Keyser

      Version of Record online: 9 JAN 2013 | DOI: 10.1002/cphc.201200793

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      Control system: The bacterial signal indole and its derivative 4 fluoro-indole are shown to increase the conductance of ions through lipid membranes (see picture). In addition, it is reported that these molecules can affect the oxygen consumption in mitochondria by providing an electric shunt across the lipid membrane.

    15. Surface Wrinkling Induced by Photofluidization of Low Molecular Azo Glasses (pages 424–430)

      Philipp Gruner, Michael Arlt and Dr. Thomas Fuhrmann-Lieker

      Version of Record online: 13 DEC 2012 | DOI: 10.1002/cphc.201200772

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      Light-induced wrinkles: Wrinkling of stressed layer systems cannot only be induced by heat but also by photochemical processes. The characteristic properties of photoinduced wrinkling are presented using a low molecular azo glass as the key component.

    16. Modification of Electrode Surfaces by Self-Assembled Monolayers of Thiol-Terminated Oligo(Phenyleneethynylene)s (pages 431–440)

      Dr. Inderpreet Kaur, Xiaotao Zhao, Prof. Martin R. Bryce, Phil A. Schauer, Paul J. Low and Dr. Ritu Kataky

      Version of Record online: 11 JAN 2013 | DOI: 10.1002/cphc.201200744

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      Monolayers of thiol-terminated rigid rod wire-like oligo(phenyleneethynylene)s assembled on electrodes show charge-transfer properties which are dependent on their structure and terminal group.

    17. Monitoring Silica Supported Molybdenum Oxide Catalysts at Work: A Raman Spectroscopic Study (pages 441–447)

      Dr. Jörg P. Thielemann and Prof. Dr. Christian Hess

      Version of Record online: 20 DEC 2012 | DOI: 10.1002/cphc.201200648

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      Oxo once or twice: The structure of silica-SBA-15-supported molybdenum oxide catalysts is studied using visible Raman spectroscopy (see picture). The results reveal that the detailed structure, that is, the ratio of dioxo and monooxo surface molybdenum oxide species, depends on temperature, gas-phase composition, and molybdenum oxide loading.

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