ChemPhysChem

Cover image for Vol. 8 Issue 11

August 6, 2007

Volume 8, Issue 11

Pages 1585–1730

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
    1. Cover Picture: Sub-Picosecond Mid-Infrared Spectroscopy of Phytochrome Agp1 from Agrobacterium tumefaciens (ChemPhysChem 11/2007) (page 1585)

      Christian Schumann, Ruth Groß, Norbert Michael, Tilman Lamparter and Rolf Diller

      Article first published online: 26 JUL 2007 | DOI: 10.1002/cphc.200790033

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      The cover picture shows a green, flowering potato plant. Greening and flower induction of plants are triggered by phytochromes, photoreceptors which are ubiquitous in plants but were also found in bacteria and fungi. The primary photoreaction of the bilin chromophore launching the signal cascade takes place on the picosecond timescale. In the article by Schumann et al. on page 1657, ultrafast infrared spectroscopy was used to monitor structural dynamics of a phytochrome from the soil bacterium Agrobacterium tumefaciens. This phytochrome incorporates the ancient type of chromophore, biliverdin. The potato plant was painted in water colour by the German artist Katrin Peper (http://www.katrin-peper.com) and provided with kind permission. The International Society for Microbial Ecology is acknowledged for the image of an Agrobacterium tumefaciens colony.

  2. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
  3. News

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
  4. Minireview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
    1. The Nature and Efficiency of Neurotransmitter Exocytosis also Depend on Physicochemical Parameters (pages 1597–1605)

      Christian Amatore, Stéphane Arbault, Manon Guille and Frédéric Lemaître

      Article first published online: 19 JUN 2007 | DOI: 10.1002/cphc.200700225

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      Exocytosis delivers chemical messengers to the extracellular medium of living cells. This minireview summarizes the physicochemical aspects of the exocytosis mechanism and shows that purely biological aspects cannot be segregated from physicochemical aspects such as viscosity η and mechanical tension σ. The picture shows the second main step of exocytosis, in which a fusion pore is formed, through which neurotransmitters (stars) can diffuse.

  5. Highlight

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
    1. Collapsed But Not Folded: Looking with Advanced Optical Spectroscopy at Protein Folding (pages 1607–1609)

      Jörg Enderlein

      Article first published online: 19 JUN 2007 | DOI: 10.1002/cphc.200700247

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      The intermediate folding step: The highlight discusses a recent study by Hoffman et al. on the collapsed but still unfolded state of a small protein under close to native conditions. This collapsed unfolded state (see picture) is an important intermediate between the completely denatured, unfolded and the completely folded, native protein structure and is thought to be of paramount importance for the final folding.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
    1. The Photoelectric Response of Gold-Nanoparticle Monolayers (pages 1611–1614)

      Junke Tang, Huilin Rong, Xinchang Li, Bingsuo Zou and Jinru Li

      Article first published online: 2 JUL 2007 | DOI: 10.1002/cphc.200700106

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      A direct relation: The photoenhancement of current in hydrophobic gold-nanoparticle monolayers, caused by surface plasmon resonance absorption, has a linear relationship with the degree of coverage (θ) of the monolayers on electrodes (see graph).

    2. Microwave-Assisted Hydrothermal Synthesis of Monophasic Mo-V-Te-Nb-O Mixed Oxide Catalyst for the Selective Ammoxidation of Propane (pages 1615–1617)

      N. Raveendran Shiju and Vadim V Guliants

      Article first published online: 5 JUL 2007 | DOI: 10.1002/cphc.200700257

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      Rapid and green: Crystalline, multimetallic oxide with orthorhombic M1 phase structure can be synthesized rapidly and reproducibly by microwave heating. The material exhibits very high catalytic activity for direct ammoxidation of propane to acrylonitrile (see picture).

    3. Sizing Trinucleotide Repeat Sequences by Single-Molecule Analysis of Fluorescence Brightness (pages 1618–1621)

      Robert Schlapak, Helen Kinns, Christian Wechselberger, Jan Hesse and Stefan Howorka

      Article first published online: 5 JUL 2007 | DOI: 10.1002/cphc.200700163

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      Sequence information of individual DNA strands is determined by the frequency with which a specific base occurs in a strand. Using huntingtin as a model system (see picture), the number of CAG repeats is obtained by incorporating fluorescent cytidine and analyzing the accumulated brightness of DNA strands by single-molecule fluorescence microscopy.

  7. Articles

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
    1. Structure-Dependent Photophysics Studied in Single Molecules of Polythiophene Derivatives (pages 1623–1628)

      Toshikazu Sugimoto, Yohei Ebihara, Kenji Ogino and Martin Vacha

      Article first published online: 19 JUN 2007 | DOI: 10.1002/cphc.200700277

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      Influential structure: The structure–property relationship in conjugated polymers is investigated for branched polythiophenes. Single-molecule spectroscopy (see figure) reveals that the long polystyrene branches prevent collapsed structures and have a strong impact on the polymer's photophysical properties.

    2. Micro-Hydration of the MgNO3+ Cation in the Gas Phase (pages 1629–1639)

      Barbara Jagoda-Cwiklik, Pavel Jungwirth, Lubomír Rulíšek, Petr Milko, Jana Roithová, Joël Lemaire, Philippe Maitre, Jean Michel Ortega and Detlef Schröder

      Article first published online: 28 JUN 2007 | DOI: 10.1002/cphc.200700196

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      The secrets of micro-hydration: The sequential solvation of the MgNO3+ cation is probed by theory and various mass spectrometric experiments including infrared spectroscopy of mass-selected ions. For [MgNO3(H2O)n]+ with n≥5, formation of a second solvation shell is observed, and monodendate coordination of the nitrato ligand becomes energetically accessible.

    3. Gas-Phase Infrared Photodissociation Spectroscopy of Tetravanadiumoxo and Oxo–Methoxo Cluster Anions (pages 1640–1647)

      Sandra Feyel, Helmut Schwarz, Detlef Schröder, Charles Daniel, Hans Hartl, Jens Döbler, Joachim Sauer, Gabriele Santambrogio, Ludger Wöste and Knut R. Asmis

      Article first published online: 2 JUL 2007 | DOI: 10.1002/cphc.200700255

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      Vanadium clusters: The gas-phase IR spectra of the ions V4O9 and V4O10 and of the related methoxo clusters V4O9(OCH3) and V4O8(OCH3)2 are investigated. The methoxy groups replace terminal oxo ligands (see structure), and the resulting clusters show absorptions due to bridging oxo ligands, ν(V[BOND]O[BOND]V), terminal oxo groups, ν(V[DOUBLE BOND]O), and C[BOND]O stretching, ν(C[BOND]O) (see spectrum).

    4. Methodology for the Calculation of the Potential of Mean Force for a Cation–π Complex in Water (pages 1648–1656)

      Aziz Ghoufi, Pierre Archirel, Jean-Pierre Morel, Nicole Morel-Desrosiers, Anne Boutin and Patrice Malfreyt

      Article first published online: 22 JUN 2007 | DOI: 10.1002/cphc.200700197

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      Favourable interactions: The association between a water-soluble calixarene and the caesium cation is governed by favourable cation–π interactions (see picture). The authors establish a new methodology for both the calculation of the potential of mean force between the host and guest and the thermodynamic properties of association.

    5. Sub-Picosecond Mid-Infrared Spectroscopy of Phytochrome Agp1 from Agrobacterium tumefaciens (pages 1657–1663)

      Christian Schumann, Ruth Groß, Norbert Michael, Tilman Lamparter and Rolf Diller

      Article first published online: 5 JUL 2007 | DOI: 10.1002/cphc.200700210

      Thumbnail image of graphical abstract

      Isomerization: Light sensing by phytochrome photoreceptors is initiated via Z–E isomerization of the chromophore, an open chain tetrapyrrole molecule (see picture). The vibrational dynamics of this primary photoreaction in the bacterial phytochrome Agp1 from Agrobacterium tumefacines are followed by means of ultrafast infrared spectroscopy.

    6. Confocal Microscopy Imaging of Electrochemiluminescence at Double Band Microelectrode Assemblies: Numerical Solution of the Inverse Optical Problem (pages 1664–1676)

      Christian Amatore, Alexander Oleinick, Oleksiy V. Klymenko, Laurent Thouin, Laurent Servant and Irina Svir

      Article first published online: 6 JUL 2007 | DOI: 10.1002/cphc.200700216

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      Realistic model: Electrochemiluminescence (ECL) from confocal microscopy imaging is theoretically described by considering three different source components of light from (see figure): 1) outside the sampling confocal volume, 2) electrode surfaces and 3) within the sampling confocal volume. This realistic model allows a numerical solution of the inverse optical problem and explains the experimental data obtained at different scanning plane heights.

    7. Sensitized Emission from Lanthanide-Doped Nanoparticles Embedded in a Semiconductor Sol–Gel Thin Film (pages 1677–1683)

      Sri Sivakumar, Frank C. J. M. van Veggel and Mati Raudsepp

      Article first published online: 22 JUN 2007 | DOI: 10.1002/cphc.200700283

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      Ln3+-doped nanoparticles shine, showing sensitized emission in the visible and near-infrared region when embedded in semiconductor thin films derived from a sol–gel method (see figure). Energy is transferred from the semiconductor matrix to the lanthanide ions after optical excitation of the semiconductor thin film.

    8. In Silico Engineering of Tailored Ink-Binding Ability at Molecular Printboards (pages 1684–1693)

      Damien Thompson

      Article first published online: 28 JUN 2007 | DOI: 10.1002/cphc.200700288

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      Molecular recognition: Dynamic simulation of printboard interactions shows how charge and steric interactions can help discriminate between ink molecules of different sizes, with potential applications to nanopatterning at self-assembled monolayers.

    9. The Synthesis and Characterisation of Ferromagnetic CaMn2O4 Nanowires (pages 1694–1700)

      Donna C. Arnold, Olga Kazakova, Guillaume Audoit, Joseph M. Tobin, Jaideep S. Kulkarni, Sergey Nikitenko, Michael A. Morris and Justin D. Holmes

      Article first published online: 19 JUL 2007 | DOI: 10.1002/cphc.200700308

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      Ferromagnetism is observed in marokite-type CaMn2O4 nanowires with diameters between 10 and 20 nm (see transmission electron microscopy image). The structure can be described as MnO6 octahedral units linked to form a manganese oxide framework with the Ca2+ ions occupying tunnels formed within this framework (see picture, where the pink squares are MnO6 octahedra and the yellow spheres are Ca2+ ions).

    10. Association Behavior of a Nitrilotriacetic-Acid-Modified Dye in a Poly(Vinyl Alcohol) Film Containing Ni(II)-Adsorbed Gold Nanoparticles (pages 1701–1706)

      Masanori Sakamoto, Takashi Tachikawa, Sung Sik Kim, Mamoru Fujitsuka and Tetsuro Majima

      Article first published online: 5 JUL 2007 | DOI: 10.1002/cphc.200700328

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      Coming together: The association behavior of a nitrilotriacetic-acid-modified 5(6)-carboxyfluorescein dye (F-NTA) in a poly(vinyl alcohol) (PVA) film and in a PVA film containing metal nanoparticles (Nps) is investigated. F-NTA forms an H-aggregate in the PVA film that contains Ni(II)-adsorbed AuNps (see picture; F-NTA=green plates, Ni(II)=green circles).

    11. The Molecular Orientation of para-Sexiphenyl on Cu(110) and Cu(110) p(2×1)O (pages 1707–1712)

      Martin Oehzelt, Leonhard Grill, Stephen Berkebile, Georg Koller, Falko P. Netzer and Michael G. Ramsey

      Article first published online: 22 JUN 2007 | DOI: 10.1002/cphc.200700357

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      Optimizing performance: The molecular orientation and growth of organic semiconductors can be steered by surface chemistry. Using the model compound para-sexiphenyl [see figure C36H24 on Cu(110) p(2×1)–O], the flexibility of organic molecules to adopt a given surface corrugation and their unique tilting, which releases stress, is demonstrated.

    12. Photochemical Z[RIGHTWARDS ARROW]E Isomerization of a Hemithioindigo/Hemistilbene ω-Amino Acid (pages 1713–1721)

      Thorben Cordes, Björn Heinz , Nadja Regner, Christian Hoppmann, Tobias E. Schrader, Wolfram Summerer, Karola Rück-Braun and Wolfgang Zinth

      Article first published online: 5 JUL 2007 | DOI: 10.1002/cphc.200700223

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      Photochemical switching of isomeric states of a ω-amino acid is investigated with ultrafast time-resolved spectroscopic techniques. Theoretical modeling determines the sequence (see scheme): Optical excitation leads to sequential population of the Franck–Condon state (FC*), the relaxed state (RS), and a state with charge-transfer character (CTC), and relaxation occurs via a conical intersection (CoI).

    13. Spectroscopic Fingerprints of Amine and Imide Functional Groups in Self-Assembled Monolayers (pages 1722–1726)

      Miguel Ruiz-Osés, Thorsten Kampen, Nora González-Lakunza, Iñaki Silanes, Philipp M. Schmidt-Weber, André Gourdon, Andrés Arnau, Karsten Horn and J. Enrique Ortega

      Article first published online: 2 JUL 2007 | DOI: 10.1002/cphc.200700295

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      Group fingerprinting: The spectroscopic signatures of N and O atoms at imide and amine functional end groups in monolayers of naphthalene tetracarboxylic diimide (NTCDI) and 1,4-bis(4,6-diamino-1,3,5-triazin-2-yl)benzene (BDG) on Au(111) (see picture) have been obtained by combining photoemission and X-ray absorption techniques with DFT calculations.

  8. Book Review

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
  9. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. News
    5. Minireview
    6. Highlight
    7. Communications
    8. Articles
    9. Book Review
    10. Preview
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      Preview: ChemPhysChem 12/2007 (page 1730)

      Article first published online: 26 JUL 2007 | DOI: 10.1002/cphc.200790036

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