ChemPlusChem

Cover image for Vol. 77 Issue 9

September 2012

Volume 77, Issue 9

Pages 731–849

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Graphical Abstract
    5. News
    6. Masthead
    7. Communications
    8. Full Papers
    1. You have free access to this content
      Cover Picture: Biofilm Formation on Chromatic Sol–Gel/Polydiacetylene Films (ChemPlusChem 9/2012) (page 731)

      Margarita Ritenberg, Dr. Sofiya Kolusheva, Hadas Ganin, Prof. Michael M. Meijler and Prof. Raz Jelinek

      Article first published online: 11 SEP 2012 | DOI: 10.1002/cplu.201290038

      Thumbnail image of graphical abstract

      The cover picture shows a new colorimetric thin film assembly for studying bacterial biofilms as described by R. Jelinek and co-workers in their Full Paper on page 752 ff. The white background corresponds to a transparent sol-gel layer constructed through a dip-coating technique. Within the sol-gel are domains of polydiacetylene—a unique chromatic polymer which undergoes dramatic color (and fluorescence) transformations. Initially, the polydiacetylene domains appear blue (and nonfluorescent), however, after specific accumulation of bacterial biofilms, the polydiacetylene regions turn intense red (and fluorescent). The polydiacetylene/sol-gel film assembly constitutes a powerful platform for monitoring biofilm formation in situ.

  2. Masthead

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    2. Cover Picture
    3. Masthead
    4. Graphical Abstract
    5. News
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    8. Full Papers
    1. Masthead: ChemPlusChem 9/2012 (page 732)

      Article first published online: 11 SEP 2012 | DOI: 10.1002/cplu.201290039

  3. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Graphical Abstract
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    1. Graphical Abstract: ChemPlusChem 9/2012 (pages 733–737)

      Article first published online: 11 SEP 2012 | DOI: 10.1002/cplu.201290040

  4. News

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    4. Graphical Abstract
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    1. Spotlights on our sister journals: ChemPlusChem 9/2012 (pages 738–741)

      Article first published online: 11 SEP 2012 | DOI: 10.1002/cplu.201290041

  5. Masthead

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Graphical Abstract
    5. News
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    1. Masthead 2: ChemPlusChem 9/2012 (page 742)

      Article first published online: 11 SEP 2012 | DOI: 10.1002/cplu.201290042

  6. Communications

    1. Top of page
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    3. Masthead
    4. Graphical Abstract
    5. News
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    7. Communications
    8. Full Papers
    1. Honeycomb Porous Framework of Zinc(II): Effective Host for Palladium Nanoparticles for Efficient Three-Component (A3) Coupling and Selective Gas Storage (pages 743–747)

      Kolleboyina Jayaramulu, Dr. Kasibhatta K. R. Datta, Mothika V. Suresh, Gayatri Kumari, Dr. Ranjan Datta, Prof. Chandrabhas Narayana, Prof. Muthusamy Eswaramoorthy and Prof. Tapas Kumar Maji

      Article first published online: 21 JUN 2012 | DOI: 10.1002/cplu.201200093

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      MOF for effective stabilizer for “Pd” and selective host for CO2: A porous, layered MOF system {[Zn(Himdc)(bipy)].DMF} (1; Himdc=4,5-imidazoledicarboxylate, bipy=4,4'-bipyridine) shows selective gas-storage properties, while the polar nanochannels serve as functional scaffold for the stabilization of highly dispersed Pd nanoparticles. The Pd@MOF1 a hybrid is a highly active and recyclable catalyst for the synthesis of propargylamine derivatives through A3 coupling reactions.

    2. A Yolk–Shell Fe3O4@C Composite as an Anode Material for High-Rate Lithium Batteries (pages 748–751)

      Yi Zhao, Jiaxin Li, Chuxin Wu, Yunhai Ding and Prof. Lunhui Guan

      Article first published online: 3 JUL 2012 | DOI: 10.1002/cplu.201200134

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      Good egg: A unique yolk–shell Fe3O4@C composite with high loading ratio of 90 wt % has been prepared (see figure). As an anode material for lithium-ion batteries, this composite exhibits a high capacity of 680 mAh g−1 even at a large current density of 5 A g−1, and makes it a promising anode material for next-generation lithium-ion batteries.

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Graphical Abstract
    5. News
    6. Masthead
    7. Communications
    8. Full Papers
    1. Biofilm Formation on Chromatic Sol–Gel/Polydiacetylene Films (pages 752–757)

      Margarita Ritenberg, Dr. Sofiya Kolusheva, Hadas Ganin, Prof. Michael M. Meijler and Prof. Raz Jelinek

      Article first published online: 11 JUN 2012 | DOI: 10.1002/cplu.201200088

      Thumbnail image of graphical abstract

      The red and the blue: Chromatic sol-gel/polydiacetylene (PDA) thin films, assembled through a dip-coating technique, enable in situ colorimetric and fluorescent detection of bacterial biofilm formation (see figure). Interestingly, the gel-embedded PDA domains promote biofilm accumulation. The sol-gel/PDA assembly can be also employed for high-throughput screening of biofilm inhibitors.

    2. Magnetic-Field-Dependent 1H Relaxivity Behavior of Biotin/Avidin-Based Magnetic Resonance Imaging Probes (pages 758–769)

      Dr. Kirti Dhingra Verma, Dr. Anurag Mishra, Dr. Jörn Engelmann, Michael Beyerlein, Prof. Dr. Martin E. Maier and Prof. Dr. Nikos K. Logothetis

      Article first published online: 25 JUN 2012 | DOI: 10.1002/cplu.201200064

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      High relaxivity contrast agents for targeted MRI: Two biotinylated contrast agents (CAs), [Gd.L1–2], have been synthesized and characterized for magnetic resonance imaging (see figure). On binding to avidin, the transverse proton relaxivity (r2p) of [Gd.L1] undergoes a 906 % increase compared with 225 % for [Gd.L2]. The longitudinal proton relaxivity (r1p) shows strong field dependence. [Gd.L1]–avidin allows access of two H2O molecules to Gd whereas [Gd.L2]–avidin allows one.

    3. Kinetic Study of Thermal 1,3-Dipolar Cycloaddition of Azomethine Ylides by Using Differential Scanning Calorimetry (pages 770–777)

      Juan Mancebo-Aracil, Dr. María J. Muñoz-Guillena, Ion Such-Basáñez and Dr. José M. Sansano-Gil

      Article first published online: 26 JUN 2012 | DOI: 10.1002/cplu.201200107

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      The kinetics of the title cycloaddition has been evaluated through differential scanning calorimetry (DSC; see scheme, Bn=benzyl).The application of known kinetic models and mathematical multiple non-linear regressions allow the determination and comparison of Ea, lnA, reaction orders, and reaction enthalpy values. Finally a rate equation for each temperature studied can be established for this particular thermal cycloaddition.

    4. Color in Poly(3,4-ethylenedioxythiophene) with Profound Implications for Electronic, Electrochemical, and Optical Functions (pages 778–788)

      Rambabu Sydam and Dr. Melepurath Deepa

      Article first published online: 3 JUL 2012 | DOI: 10.1002/cplu.201200035

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      Color films: A new spectroscopic tunability in poly(3,4-ethylenedioxythiophene) (PEDOT) with switching between brown and bright blue hues represents a new design paradigm for the creation of electrodes for use in organic electronic, photovoltaic, and electrochromic devices.

    5. Electrodes of Poly(N-methyl pyrrole)/Au and Poly(m-aminobenzene sulfonic acid)-Functionalized Multiwalled Carbon Nanotubes for Supercapacitor Applications (pages 789–798)

      B. Narsimha Reddy, Naresh Billa and Dr. Melepurath Deepa

      Article first published online: 18 JUL 2012 | DOI: 10.1002/cplu.201200140

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      Asymmetric performance boost: A new asymmetric supercapacitor made of poly(N-methylpyrrole)/Au and poly(m-aminobenzene sulfonic acid)-fuctionalized multiwalled carbon nanotubes delivers an extraordinarily high capacitance of 967 F g−1 (see figure).

    6. Aggregation and Solvation of Chiral N,P-Amide Ligands in Coordinating Solvents: A Computational and NMR Spectroscopic Study (pages 799–806)

      Petra Rönnholm, Sten O. Nilsson Lill, Jürgen Gräfenstein, Per-Ola Norrby, Mariell Pettersson and Göran Hilmersson

      Article first published online: 3 JUL 2012 | DOI: 10.1002/cplu.201200033

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      O dimer, where art thou? Structures of chiral lithium N,P-amides in coordinating solvents are elucidated by using NMR spectroscopy (see figure). Experimental equilibria between different lithium amide dimers are reproduced by using finely tuned dispersion-corrected density functional theory.

    7. Nanocomposites of Ni(OH)2/Reduced Graphene Oxides with Controllable Composition, Size, and Morphology: Performance Variations as Pseudocapacitor Electrodes (pages 807–816)

      Junwu Xiao and Prof. Dr. Shihe Yang

      Article first published online: 6 JUL 2012 | DOI: 10.1002/cplu.201200102

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      Growth management: The morphology, size, and dispersion of Ni(OH)2 nanocrystals, which are grown on reduced graphene oxide (RGO) sheets from amorphous precursors, can be controlled by temperature-dependent Ostwald ripening processes (see figure), and are critical to electrochemical capacitor performance.

    8. Pore Length Effect on Drug Uptake and Delivery by Mesoporous Silicas (pages 817–831)

      Pedro Burguete, Prof. Aurelio Beltrán, Dr. Carmen Guillem, Prof. Julio Latorre, Dr. Francisco Pérez-Pla, Prof. Daniel Beltrán and Prof. Pedro Amorós

      Article first published online: 16 JUL 2012 | DOI: 10.1002/cplu.201200099

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      Short is better: The advantages of using mesoporous supports for drug supply depend on the feasibility of mass transfer through confined spaces, which is clearly improved by short-length mesopores insofar as the undesirable effects associated with blocking phenomena are greatly reduced (see figure).

    9. Fluorene-Containing Organic Photosensitizers for Dye-Sensitized Solar Cells (pages 832–843)

      Chun-Guey Wu, Ming-Fong Chung, Hui-Hsu Gavin Tsai, Chun-Jui Tan, Su-Chien Chen, Chiao-Hsin Chang and Ting-Wen Shih

      Article first published online: 9 JUL 2012 | DOI: 10.1002/cplu.201200127

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      Catch the sun: Seven new donor–spacer–acceptor metal-free organic dyes containing a fluorene and/or thiophene unit as a conjugated spacer have been prepared and their photovoltaic performance studied (see a selection of structures). Theoretical calculations suggest that the small difference in the efficiency of these sensitizers is attributable partly to the degree of effective charge transfer upon excitation, not totally to the absorption profile of the dye molecules.

    10. Enhanced Electrochemical Sensing for Persistent Organic Pollutants by Nanohybrids of Graphene Nanosheets that are Noncovalently Functionalized with Cyclodextrin (pages 844–849)

      Gangbing Zhu, Xiaohua Zhang, Pengbo Gai and Prof. Dr. Jinhua Chen

      Article first published online: 9 JUL 2012 | DOI: 10.1002/cplu.201200144

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      Bridging the gap: Using 3,4,9,10-perylene tetracarboxylic acid as a bridge to connect mono(6-ethanediamine-6-deoxy)-β-cyclodextrin to the surface of graphene, the nanohybrid material had been synthesized and used as sensing material for electrochemical detection of persistent organic pollutants (see figure, GC=glassy carbon). The limit of detection is 1.0 nM (S/N=3), and is at least eight times lower than for other electrochemical sensors.

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