ChemPlusChem

Cover image for Vol. 77 Issue 2

February 2012

Volume 77, Issue 2

Pages 83–148

  1. Cover Picture

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    4. Graphical Abstract
    5. News
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      Cover Picture: Scaffold-Optimized Dendrimers for the Detection of the Triacetone Triperoxide Explosive Using Quartz Crystal Microbalances (ChemPlusChem 2/2012) (page 83)

      Daniel Lubczyk, Dr. Matthias Grill, Prof. Dr. Martin Baumgarten, Prof. Dr. Siegfried R. Waldvogel and Prof. Dr. Klaus Müllen

      Version of Record online: 10 FEB 2012 | DOI: 10.1002/cplu.201290006

      Thumbnail image of graphical abstract

      The cover picture shows a quartz microbalance which is capable of tracing vapors of the explosive triacetone triperoxide (TATP) on a ppb level. The quartz crystal in such 200 MHz piezoelectric devices is about 5 mm in diameter and is coated with high-performance dendrimers, which are schematically indicated by a tree. In their Communication on page 102 ff., S. R. Waldvogel and K. Müllen et al. report on scaffold-optimized phenylene dendrimers that provide outstanding selectivity and affinity for tracing the explosive material. The peroxide molecules are accommodated in the voids defined by the branches of the dendritic architecture.

  2. Masthead

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    1. Masthead: ChemPlusChem 2/2012 (page 84)

      Version of Record online: 10 FEB 2012 | DOI: 10.1002/cplu.201290007

  3. Graphical Abstract

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  4. News

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  5. Communications

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    1. A Molecular Lock and Key: “Unlocked–Locked” Conformational Switching of a Receptor by Anions (pages 93–97)

      Sasanka Dalapati, Dr. Md. Akhtarul Alam, Sankar Jana, Rajat Saha, Saptarshi Biswas and Dr. Nikhil Guchhait

      Version of Record online: 4 JAN 2012 | DOI: 10.1002/cplu.201100036

      Thumbnail image of graphical abstract

      Lock up your valuables: Receptor 1 acts as a “molecular lock” and anions act as “keys”; H2PO4 can “lock” 1 by switching it from its “unlocked” conformation, however, the structurally similar HSO4 cannot “lock” receptor 1 as evidenced by single-crystal X-ray analysis (see scheme). The “unlocked–locked” conformational switching of 1 was investigated by monitoring changes in fluorescence intensity in the presence of different anions.

    2. Sequential Immobilization of Enzymes in Microfluidic Channels for Cascade Reactions (pages 98–101)

      Sara Fornera, Phillip Kuhn, Dario Lombardi, A. Dieter Schlüter, Petra S. Dittrich and Peter Walde

      Version of Record online: 20 JAN 2012 | DOI: 10.1002/cplu.201100068

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      Go with the flow: A flow-through microfluidic reactor system was developed that contains the three enzymes, β-galactosidase (β-Gal), glucose oxidase (GOD), and peroxidase (HRP), immobilized with a polycationic dendronized polymer in a predetermined sequence on a single chip for the conduction of an enzymatic cascade reaction. The desired enzyme localization within the microchannels of the chip could be achieved with a micromechanical valve system.

    3. Scaffold-Optimized Dendrimers for the Detection of the Triacetone Triperoxide Explosive Using Quartz Crystal Microbalances (pages 102–105)

      Daniel Lubczyk, Dr. Matthias Grill, Prof. Dr. Martin Baumgarten, Prof. Dr. Siegfried R. Waldvogel and Prof. Dr. Klaus Müllen

      Version of Record online: 25 JAN 2012 | DOI: 10.1002/cplu.201100080

      Thumbnail image of graphical abstract

      Affinity and selectivity: The online detection of the explosive triacetone triperoxide (TATP) is an utmost challenge in security research. The great number of events wherein TATP was involved underlines the significance of solutions to trace that particular explosive material. New optimized functionalized polyphenylene dendrimers (see structure) have been synthesized that can be used as powerful affinity systems to trace TATP on a ppb level.

  6. Full Papers

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    1. Palladium Nanoparticles Supported on Mixed-Linker Metal–Organic Frameworks as Highly Active Catalysts for Heck Reactions (pages 106–112)

      Dr. Yuanbiao Huang, Shuiying Gao, Dr. Tianfu Liu, Dr. Jian Lü, Xi Lin, Dr. Hongfang Li and Prof. Rong Cao

      Version of Record online: 17 JAN 2012 | DOI: 10.1002/cplu.201100021

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      Like a MOF to a flame: A facile ion-exchange approach for the preparation of palladium nanoparticle (Pd NP) catalysts supported on amine-functionalized, mixed-linker metal–organic frameworks based on MIL-53(Al) has been developed. These well-dispersed Pd NPs drastically enhance N2 adsorption and show high activity and selectivity for Heck reactions (see scheme). The Pd NPs catalysts exhibit high stability and can be easily recovered and reused.

    2. Surface Functionalization and Characterization of TiO2 with Cibacron Blue Dye: An Affinity Column for Proteins (pages 113–117)

      Chilukuri Subbalakshmi, Manaswita Nag and Sunkara V. Manorama

      Version of Record online: 20 JAN 2012 | DOI: 10.1002/cplu.201100039

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      Get a load of this! The purification of lactic dehydrogenase (LHD) using an affinity column of TiO2 functionalized with Cibacron blue dye is illustrated. The large capacity of the TiO2–CB NP microtip column for proteins, its stability at room temperature, and low cost of preparation suggest that TiO2–CB NPs are useful for rapid protein purification. The two-step procedure results in the recovery of over 90 % of the protein loaded.

    3. Tweezer-like Complexes of Crown Ethers with Divalent Metals: Probing Cation-Size-Dependent Conformations by Vibrational Spectroscopy in the Gas Phase (pages 118–123)

      Francisco Gámez, Paola Hurtado, Dr. Said Hamad, Prof. Bruno Martínez-Haya, Dr. Giel Berden and Prof. Jos Oomens

      Version of Record online: 11 JAN 2012 | DOI: 10.1002/cplu.201100044

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      Molecular tweezers in the gas phase: Isolated tweezer-like ternary complexes comprising two [18]crown-6 cyclic ether molecules and one divalent cation of varying size (Cu2+, Ca2+, Ba2+; see structures) have been investigated by means of laser vibrational action spectroscopy and computations. A remarkable dependence of the structure of the complexes with the size of the cation is observed.

    4. Facile and Low-Cost Synthesis of Large-Area Pure V2O5 Nanosheets for High-Capacity and High-Rate Lithium Storage over a Wide Temperature Range (pages 124–128)

      Dr. Zhong-li Wang, Dr. Dan Xu, Prof. Li-min Wang and Prof. Dr. Xin-bo Zhang

      Version of Record online: 9 JAN 2012 | DOI: 10.1002/cplu.201100051

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      Layer upon layer: Pure V2O5 nanosheets (see figure; C) have been successfully synthesized by a novel and facile dissolution–splitting method using low-cost raw materials (A). The as-prepared product exhibits enhanced lithium storage properties including good cycling and rate performance, 144 mAh g−1 at 10 C and 95 mAh g−1 at 20 C, as well as high reversible capacity, 290 mAh g−1.

    5. DNA “Nanolamps”: “Clicked” DNA Conjugates with Photon Upconverting Nanoparticles as Highly Emissive Biomaterial (pages 129–134)

      Dipl. Ing. Moritz M. Rubner, Dipl.-Chem. Daniela E. Achatz, Dr. Heike S. Mader, Dr. Judith A. Stolwijk, Prof. Dr. Joachim Wegener, Prof. Gregory S. Harms, Prof. Dr. Otto S. Wolfbeis and Prof. Dr. Hans-Achim Wagenknecht

      Version of Record online: 25 JAN 2012 | DOI: 10.1002/cplu.201100055

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      Upconverting DNA: Upconversion nanoparticles are ligated to oligonucleotides by using “click”-type cycloaddition (see figure). Excitation in the near-infrared region yields bright luminescence of the DNA conjugates in the visible range.

    6. Synthesis and Stability of Highly Crystalline and Stable Iron/Iron Oxide Core/Shell Nanoparticles for Biomedical Applications (pages 135–140)

      Dr. Soshan Cheong, Dr. Peter Ferguson, Dr. Ian F. Hermans, Dr. Guy N. L. Jameson, Dr. Sujay Prabakar, David A. J. Herman and Assoc. Prof. Richard D. Tilley

      Version of Record online: 20 JAN 2012 | DOI: 10.1002/cplu.201100074

      Thumbnail image of graphical abstract

      Strike while the iron is hot: Stable core/shell nanoparticles of single-crystal iron core are shown to produce much greater contrast enhancement in magnetic resonance imaging of cells, compared to that produced by pure iron oxides without increase in cytotoxicity (see TEM image of iron/iron oxide nanoparticles).

    7. Porous Frameworks Based on Carborane–Ln2(CO2)6: Architecture Influenced by Lanthanide Contraction and Selective CO2 Capture (pages 141–147)

      Sheng-Li Huang, Dr. Yue-Jian Lin, Wei-Bin Yu and Prof. Dr. Guo-Xin Jin

      Version of Record online: 25 JAN 2012 | DOI: 10.1002/cplu.201100083

      Thumbnail image of graphical abstract

      Cast your net widely: Three distinct structure types of porous frameworks based on carborane–Ln2(CO2)6 (structure type I with Schläfli symbol of 44⋅62, structure type II with Schläfli symbol of (48⋅66⋅8)(48⋅66⋅8), and structure type III with Schläfli symbol of 412⋅63) have been synthesized and structurally characterized (see figure). Gas sorption was studied and selective CO2 capture over CH4 and N2 was observed.

  7. Preview

    1. Top of page
    2. Cover Picture
    3. Masthead
    4. Graphical Abstract
    5. News
    6. Communications
    7. Full Papers
    8. Preview
    1. You have free access to this content
      Preview: ChemPlusChem 3/2012 (page 148)

      Version of Record online: 10 FEB 2012 | DOI: 10.1002/cplu.201290005

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