ChemPhysChem

Cover image for Vol. 12 Issue 15

October 24, 2011

Volume 12, Issue 15

Pages 2677–2847

  1. Cover Picture

    1. Top of page
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    3. Inside Cover
    4. Graphical Abstract
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    8. Communications
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    1. Cover Picture: Long-Lived States to Monitor Protein Unfolding by Proton NMR (ChemPhysChem 15/2011) (page 2677)

      Aurélien Bornet, Dr. Puneet Ahuja, Dr. Riddhiman Sarkar, Laetitia Fernandes, Sonia Hadji, Shirley Y. Lee, Dr. Aydin Haririnia, Prof. David Fushman, Prof. Geoffrey Bodenhausen and Prof. Paul R. Vasos

      Version of Record online: 17 OCT 2011 | DOI: 10.1002/cphc.201190075

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      Long-lived spin states (LLSs) can be used in proton NMR to extract information about the environment and local motions of selected amino acids in a protein. LLSs were encoded and sustained in the terminal glycines of ubiquitin, as well as in serine 65, in order to investigate the effect on protein stability of factors such as urea addition, changes of pH, or residue mutations. This work is presented on p. 2729 by P. R. Vasos et al.

  2. Inside Cover

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    1. Inside Cover: Combination of MOFs and Zeolites for Mixed-Matrix Membranes (ChemPhysChem 15/2011) (page 2678)

      Beatriz Zornoza, Beatriz Seoane, Dr. Juan M. Zamaro, Dr. Carlos Téllez and Prof. Dr. Joaquín Coronas

      Version of Record online: 17 OCT 2011 | DOI: 10.1002/cphc.201190076

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      Mixed matrix membranes by combinations of MOFs HKUST-1 and ZIF-8, zeolite silicalite-1 and polysulfone were applied to the separation of gas mixtures, as shown on p. 2781 by J. Coronas et al.

  3. Graphical Abstract

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  4. News

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    1. Handy Chemistry (page 2693)

      Version of Record online: 17 OCT 2011 | DOI: 10.1002/cphc.201100769

  5. Minireview

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    1. Terahertz Time-Domain Spectroscopy of Gases, Liquids, and Solids (pages 2695–2705)

      Dr. Michael Theuer, Srikantaiah Sree Harsha, Daniel Molter, Dr. Garik Torosyan and Prof. Dr. René Beigang

      Version of Record online: 6 JUL 2011 | DOI: 10.1002/cphc.201100158

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      Broadband spectroscopy: The methods employed in the spectroscopic characterization of gases, liquids, and solids in the terahertz frequency range are reviewed. Terahertz time-domain spectroscopy is applied to a frequency range between 100 GHz and 5 THz with a sub-10 GHz frequency resolution. The spectral absorption features measured can be used in material identification and sensing (e.g., of explosives, see picture). The possibilities and limitations of fundamental and industrial applications are discussed.

  6. Highlight

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    1. The Plasmonic Ruler Goes 3D! (pages 2707–2708)

      Xiaodi Su and Prof. Xiaogang Liu

      Version of Record online: 31 AUG 2011 | DOI: 10.1002/cphc.201100608

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      Almost like the movies: The world′s first 3D plasmonic ruler is highlighted herein (see picture).

  7. Communications

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    1. Calorimetric Study of Propane and Propylene Adsorption on the Active Surface of Multiwalled Carbon Nanotube Catalysts (pages 2709–2713)

      Dr. Benjamin Frank, Dr. Sabine Wrabetz, Dr. Oleksiy V. Khavryuchenko, Dr. Raoul Blume, Dr. Annette Trunschke and Prof. Dr. Robert Schlögl

      Version of Record online: 18 AUG 2011 | DOI: 10.1002/cphc.201100491

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      Hunting for the active site: Multiwalled carbon nanotubes are investigated as an adsorbent for propane and propylene in the view of catalytic application in the oxidative dehydrogenation of propane. Support by XPS and TPD analyses gives an indication of a quantitative description of the carbon surface under reaction conditions (see picture).

    2. Polydiacetylene Vesicles Containing αα-Cyclodextrin and Azobenzene as Photocontrolled Nanocarriers (pages 2714–2718)

      Dr. Xin Chen, Prof. Dr. Justin Gooding, Prof. Dr. Gang Zou, Dr. Wei Su and Prof. Dr. Qijin Zhang

      Version of Record online: 2 SEP 2011 | DOI: 10.1002/cphc.201100412

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      The in-crowd: A photocontrolled inclusion and exclusion reaction of azobenzene-containing polydiacetylene (PDA) vesicles with α-cyclodextrin (α-CD) is used as driving force to induce the release and encapsulation of Rhodamine 6G (see picture).

    3. Visible-Light Activity Enhancement of Gold-Nanoparticle-Loaded Titanium(IV) Dioxide by Preferential Excitation of Localized Surface Plasmon Resonance (pages 2719–2723)

      Dr. Shin-ichi Naya, Aimi Inoue and Prof. Hiroaki Tada

      Version of Record online: 26 AUG 2011 | DOI: 10.1002/cphc.201100288

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      Snip-snip: Cutting off the light with wavelengths shorter than 500 nm significantly enhances the visible light activities of Au-nanoparticle-loaded TiO2 (Au/TiO2) for the oxidation of alcohols and thiols (see picture).

    4. On the Stability of Polyalanine Secondary Structures: The Role of the Polyproline II Helix (pages 2724–2727)

      Prof. Giuseppe Lanza, Prof. Ugo Chiacchio, Prof. Santo Motta, Dr. Sara Pellegrino and Prof. Gianluigi Broggini

      Version of Record online: 11 OCT 2011 | DOI: 10.1002/cphc.201100378

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      The missing link: Ab initio calculations carried out on a series of terminally blocked polyalanines AcAlanNH2 provide a detailed picture on stabilities of peptide secondary structures. Among them is the polyproline II helical structure (see picture), found ubiquitously in polyalanine-rich peptides, whose stability is still poorly understood theoretically.

  8. Articles

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Minireview
    7. Highlight
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    1. Long-Lived States to Monitor Protein Unfolding by Proton NMR (pages 2729–2734)

      Aurélien Bornet, Dr. Puneet Ahuja, Dr. Riddhiman Sarkar, Laetitia Fernandes, Sonia Hadji, Shirley Y. Lee, Dr. Aydin Haririnia, Prof. David Fushman, Prof. Geoffrey Bodenhausen and Prof. Paul R. Vasos

      Version of Record online: 31 AUG 2011 | DOI: 10.1002/cphc.201100365

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      Sit back, relax…: The relaxation time constants of long-lived states of Gly and Ser residues at specific locations (shown in red along the backbone of ubiquitin) are found to be sensitive to partial unfolding of the protein.

    2. Fluorescence Quenching of CdS Quantum Dots by 4-Azetidinyl-7-Nitrobenz-2-Oxa-1,3-Diazole: A Mechanistic Study (pages 2735–2741)

      Kotni Santhosh, Satyajit Patra, S. Soumya, Dinesh Chandra Khara and Prof. Dr. Anunay Samanta

      Version of Record online: 26 AUG 2011 | DOI: 10.1002/cphc.201100515

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      Fluorescence quenching of CdS quantum dots by 4-azetidinyl-7-nitrobenz-2-oxa-1,3-diazole, which shows FRET-like behaviour, is actually mediated by the static interaction of the two (see picture).

    3. Theoretical Study on Cooperativity Effects between Anion–π and Halogen-Bonding Interactions (pages 2742–2750)

      Carolina Estarellas, Prof. Antonio Frontera, Dr. David Quiñonero and Prof. Dr. Pere M. Deyà

      Version of Record online: 18 AUG 2011 | DOI: 10.1002/cphc.201100492

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      Interesting cooperativity effects are observed in complexes in which lone pair–π or anion–π interactions coexist with halogen bonding. These through-bond effects, which can be quantified by the cooperativity energy Ecoop, are found even in systems in which the distance between the anion and the halogen-bond donor molecule is longer than 9 Å (see picture).

    4. Electrochemical Synthesis of Gallium Nanowires and Macroporous Structures in an Ionic Liquid (pages 2751–2754)

      Dr. Mohammad Al Zoubi, Dr. Rihab Al-Salman, Prof. Dr. Sherif Z. El Abedin, Prof. Dr. Yao Li and Prof. Dr. Frank Endres

      Version of Record online: 24 AUG 2011 | DOI: 10.1002/cphc.201100464

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      Ga get it! The electrochemical synthesis of gallium nanostructures by template-assisted electrodeposition in an ionic liquid is presented. The picture shows photographs of a sample of macroporous Ga (600 nm pore size) displaying different colors due to light reflections upon changing the angle of incident white light.

    5. Two-Photon STED Spectral Determination for a New V-Shaped Organic Fluorescent Probe with Efficient Two-Photon Absorption (pages 2755–2762)

      Prof. Kevin D. Belfield, Dr. Mykhailo V. Bondar, Dr. Alma R. Morales, Dr. Lazaro A. Padilha, Dr. Olga V. Przhonska and Xuhua Wang

      Version of Record online: 19 AUG 2011 | DOI: 10.1002/cphc.201100456

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      One, two, let′s go! One- and two-photon stimulated emission spectra of 1 (left) are obtained over a broad spectral region by a fluorescence quenching femtosecond pump–probe technique (right).

    6. Comparative Study of CeO2 and Doped CeO2 with Tailored Oxygen Vacancies for CO Oxidation (pages 2763–2770)

      Zhen Wang, Qi Wang, Yuchao Liao, Genli Shen, Xuzhong Gong, Ning Han, Haidi Liu and Yunfa Chen

      Version of Record online: 31 AUG 2011 | DOI: 10.1002/cphc.201100346

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      Doped Catalysts: When pure CeO2 is doped with Sm or Gd, the Ce4+ ions in the lattice are replaced by dopant ions. This results in an increase in the number of oxygen vacancies and a corresponding change in the catalytic activity (see picture).

    7. β-Sheet-Induced Chirogenesis in Polymerization of Oligopeptides (pages 2771–2780)

      Dr. Nathaniel Wagner, Boris Rubinov and Prof. Gonen Ashkenasy

      Version of Record online: 2 SEP 2011 | DOI: 10.1002/cphc.201100292

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      Order emerges: A new model for amino acid polymerization, induced by β-sheet formation, is presented (see picture). Stochastic simulation shows the crucial effects of β sheets on the peptide length distribution and on the tendency to form long isotactic peptides. The authors suggest that this or similar mechanisms may explain the origin of chiroselectivity in prebiotic environments.

    8. Combination of MOFs and Zeolites for Mixed-Matrix Membranes (pages 2781–2785)

      Beatriz Zornoza, Beatriz Seoane, Dr. Juan M. Zamaro, Dr. Carlos Téllez and Prof. Dr. Joaquín Coronas

      Version of Record online: 16 SEP 2011 | DOI: 10.1002/cphc.201100583

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      Mixed matrix membranes (MMMs) were prepared by combinations of two different kinds of porous fillers (MOFs and zeolite, see picture) and polysulfone. In the search for filler synergy, the MMMs were applied to the separation of CO2/N2, CO2/CH4, O2/N2, and H2/CH4 mixtures, finding important selectivity improvements with the HKUST-1-silicalite-1 system.

    9. Intrinsic Viscosities of Polyelectrolytes: Determination and Modeling of the Effects of Extra Salt (pages 2786–2790)

      Dr. Andreas Eich and Prof. Dr. Bernhard A. Wolf

      Version of Record online: 14 SEP 2011 | DOI: 10.1002/cphc.201100439

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      Salty: A procedure is described that yields information on the changes of the intrinsic viscosities and of the corresponding viscometric interaction parameters caused by an increasing salinity of water. The picture shows the reduction of the intrinsic viscosity of sodium pectinate in aqueous solution (27 °C) caused by the addition of different amounts of NaCl to the solvent.

    10. Ab Initio Multireference Investigation of Disjoint Diradicals: Singlet versus Triplet Ground States (pages 2791–2797)

      Dr. Sudip Chattopadhyay, Dr. Rajat K. Chaudhuri and Dr. Uttam Sinha Mahapatra

      Version of Record online: 26 AUG 2011 | DOI: 10.1002/cphc.201100430

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      Ab initio multireference calculations are presented to elucidate the electronic structure of tetramethyleneethane (TME) in its lowest singlet and triplet states and to quantify the order and extent of splitting. The triplet state is higher in energy than the singlet state in the whole range of dihedral angles, with the energy gap minimum at around 45° (see picture).

    11. Simultaneous Visualization of Surface Topography and Concentration Field by Means of Scanning Electrochemical Microscopy Using a Single Electrochemical Probe and Impedance Spectroscopy (pages 2798–2805)

      Maike Pähler, Prof. Wolfgang Schuhmann and Prof. Miklós Gratzl

      Version of Record online: 26 AUG 2011 | DOI: 10.1002/cphc.201100428

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      Electrochemical impedance spectroscopy is used for simultaneously obtaining information on the substrate-to-probe distance and on the concentration of Cl ions. By tuning the frequencies of interrogation to fast migrational relaxations in the solution, the substrate-to-probe distance can be derived followed by interrogation of processes that carry information on concentration at lower frequencies (see picture).

    12. Edge Plane Pyrolytic Graphite Electrode Covalently Modified with 2-Anthraquinonyl Groups: Theory and Experiment (pages 2806–2815)

      Barbara R. Kozub, Martin C. Henstridge, Christopher Batchelor-McAuley and Prof. Dr. Richard G. Compton

      Version of Record online: 25 AUG 2011 | DOI: 10.1002/cphc.201100424

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      Two models of surface inhomogeneity based on Marcus–Hush theory are investigated to explain the electrochemical behavior of an edge plane pyrolytic graphite electrode modified with 2-anthraquinonyl groups. Both a distribution of formal potentials, E′, and a distribution of electron tunneling distances, r0, are considered. The simulation of cyclic voltammograms involving the distribution of formal potentials (see picture) shows a better fit than the simulation with the distribution of tunneling distances.

    13. Biophysical Investigations of GBV-C E1 Peptides as Potential Inhibitors of HIV-1 Fusion Peptide (pages 2816–2822)

      Dr. Maria Jesús Sánchez-Martín, Patricia Urbán, Dr. Montserrat Pujol, Dr. Isabel Haro, Prof. M. Asunción Alsina and Dr. M. Antònia Busquets

      Version of Record online: 8 SEP 2011 | DOI: 10.1002/cphc.201100407

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      Part of the gang: Liposomes are deposited on a surface plasmon resonance chip (see AFM image of the chip) to observe the interaction of peptides corresponding to the E1 envelop protein of the hepatitis G virus with membranes to show how they reduce the interaction of the HIV-1 fusion peptide.

    14. Reaction Mechanism and the Role of Copper in the Photooxidation of Alcohol over Cu/Nb2O5 (pages 2823–2830)

      Shinya Furukawa, Yasuhiro Ohno, Dr. Tetsuya Shishido, Dr. Kentaro Teramura and Prof. Dr. Tsunehiro Tanaka

      Version of Record online: 16 SEP 2011 | DOI: 10.1002/cphc.201100388

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      Role playing: The photocatalytic activity of Nb2O5 in the oxidation of alcohol (see picture) is significantly increased by the addition of a small amount of Cu. A mechanistic study, carried out using several spectroscopic techniques, kinetic analysis and DFT calculations, reveals that copper is both a redox promoter and an effective desorption site for the product.

    15. Solvatochromic Effects on the Photoinduced Charge-Transfer States in Donor–Acceptor Substituted Polydioctylfluorenes (pages 2831–2835)

      Dr. Caryl E. Richards and Prof. Richard T. Phillips

      Version of Record online: 23 SEP 2011 | DOI: 10.1002/cphc.201100356

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      Tune up: Charge separation in polymer emitting states can be increased by choosing the right substituents for the photoactive polymer (see picture). This approach will enhance quantum efficiency in devices otherwise limited by exciton recombination.

    16. A Robust Yellow-Emitting Metallophosphor with Electron-Injection/-Transporting Traits for Highly Efficient White Organic Light-Emitting Diodes (pages 2836–2843)

      Prof. Guijiang Zhou, Xiaolong Yang, Prof. Wai-Yeung Wong, Dr. Qi Wang, Si Suo, Prof. Dongge Ma, Prof. Jikang Feng and Prof. Lixiang Wang

      Version of Record online: 14 SEP 2011 | DOI: 10.1002/cphc.201100259

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      The future's white: A yellow-emitting IrIII phosphor with electron-injection/-transporting (EI/ET) features (see figure) is employed for the first time to develop highly efficient white organic light-emitting diodes (WOLEDs).

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    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Minireview
    7. Highlight
    8. Communications
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    10. Preview
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      Version of Record online: 17 OCT 2011 | DOI: 10.1002/cphc.201190079

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