Chemistry – An Asian Journal

Cover image for Vol. 2 Issue 4

April 2, 2007

Volume 2, Issue 4

Pages 443–555

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Community Report
    5. Focus Review
    6. Full Papers
    7. Preview
    1. Cover Picture: Microporous Magnesium and Manganese Formates for Acetylene Storage and Separation (Chem. Asian J. 4/2007) (page 443)

      Denis G. Samsonenko , Hyunuk Kim, Yinyong Sun, Ghyung-Hwa Kim, Heung-Soo Lee and Kimoon Kim

      Version of Record online: 27 MAR 2007 | DOI: 10.1002/asia.200790006

      Low-cost and efficient materials that store acetylene with high selectivity are the key to its production, transportation, and delivery. In their Full Paper on page 484 ff., K. Kim and co-workers demonstrate that microporous magnesium and manganese formates show not only a high capacity for acetylene sorption but also remarkable selectivity over CO2, CH4, N2, O2, and H2 at room temperature. The metal formates discriminate C2H2 and CO2 despite their similar size and physical properties. Single-crystal X-ray structure analysis of the acetylene-adsorbed metal formates reveals two acetylene sorption sites.

  2. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Community Report
    5. Focus Review
    6. Full Papers
    7. Preview
  3. Community Report

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Community Report
    5. Focus Review
    6. Full Papers
    7. Preview
    1. You have free access to this content
      The 1st International Conference on Cutting-Edge Organic Chemistry in Asia (pages 452–454)

      Minoru Isobe and Pauline Chiu

      Version of Record online: 27 MAR 2007 | DOI: 10.1002/asia.200600423

      The 1st International Conference on Cutting-Edge Organic Chemistry in Asia

  4. Focus Review

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Community Report
    5. Focus Review
    6. Full Papers
    7. Preview
    1. Multinuclear Silver Ethynide Supramolecular Synthons for the Construction of Coordination Networks (pages 456–467)

      Thomas C. W. Mak and Liang Zhao

      Version of Record online: 16 FEB 2007 | DOI: 10.1002/asia.200600386

      Thumbnail image of graphical abstract

      Made of silver: The existence and utility of novel supramolecular synthons Ag4⊂C2[BOND]C2⊃Ag4, R[BOND]C2⊃Agn (R=aryl or alkyl; n=4, 5), and Agn⊂C2[BOND]R[BOND]C2⊃Agn (R=p-, m-, o-C6H4; n=4, 5) have been established for the construction of silver(I) coordination networks. The interplay of silver–ethynide bonding with argentophilicity, π–π stacking, and other weak interactions highlights the complexity of these networks.

  5. Full Papers

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Community Report
    5. Focus Review
    6. Full Papers
    7. Preview
    1. Self-Assembly and Host–Guest Chemistry of a 3.5-nm Coordination Nanotube (pages 468–476)

      Takumi Yamaguchi, Shohei Tashiro, Masahide Tominaga, Masaki Kawano, Tomoji Ozeki and Makoto Fujita

      Version of Record online: 15 MAR 2007 | DOI: 10.1002/asia.200600429

      Thumbnail image of graphical abstract

      A tunnel to rival Seikan: A tubular structure with a length of 3.5 nm self-assembles from four panellike ligands (L), twelve PdII ions (M), and a linear guest molecule. Remarkable length selectivity and unique redox properties (for guests with terminal tetrathiafulvalene units) can be observed.

    2. Unusual Rate Acceleration in Brønsted Acid Catalyzed Dehydration Reactions: Local Hydrophobic Environment in Aggregated N-(2,6-diphenylphenyl)-N-mesitylammonium Pentafluorobenzenesulfonates (pages 477–483)

      Akira Sakakura, Hitoshi Watanabe, Shoko Nakagawa and Kazuaki Ishihara

      Version of Record online: 15 MAR 2007 | DOI: 10.1002/asia.200600380

      Thumbnail image of graphical abstract

      Teaming up for improved efficiency: The hydrophobic environment surrounding the ammonium hydrogen atoms in aggregated [Ar2NH2]+[O3SC6F5] catalysts has a significant accelerating effect on the dehydrative cyclization of 1,3,5-triketones (O=red, F=green, N=blue, S=yellow). Dehydration catalysts that do not form a stable cyclic ion pair are less active.

    3. Microporous Magnesium and Manganese Formates for Acetylene Storage and Separation (pages 484–488)

      Denis G. Samsonenko , Hyunuk Kim, Yinyong Sun, Ghyung-Hwa Kim, Heung-Soo Lee and Kimoon Kim

      Version of Record online: 20 FEB 2007 | DOI: 10.1002/asia.200600390

      Thumbnail image of graphical abstract

      Exclusive entry: Microporous magnesium and manganese formates show not only a high capacity for acetylene sorption but also remarkable selectivity over CO2, CH4, N2, O2, and H2 at room temperature. The single-crystal X-ray structure analysis of the acetylene-adsorbed metal formates reveals two acetylene sorption sites.

    4. Synthesis and Spectroscopic Studies of Arylethynylsilanes (pages 489–498)

      Guang Shao, Akihiro Orita, Koji Nishijima, Kanako Ishimaru, Makoto Takezaki, Kan Wakamatsu, Rolf Gleiter and Junzo Otera

      Version of Record online: 12 MAR 2007 | DOI: 10.1002/asia.200700007

      Thumbnail image of graphical abstract

      Free-flow electrons: A variety of arylethynylsilanes (Ar[BOND]C[TRIPLE BOND]C[BOND]C6H4[BOND]C[TRIPLE BOND]C)nSiMe4−n can be prepared by reaction of the corresponding chlorosilanes with Ar[BOND]C[TRIPLE BOND]C[BOND]C6H4[BOND]C[TRIPLE BOND]CM (M=Li, MgBr). The emissive quantum yields of the tetrakis(arylethynyl)silanes are enhanced by through-space conjugation of the four triple bonds on silicon owing to participation of the silicon orbitals in the acetylenic π orbitals.

    5. Tetrahydrofuran Activates Fluorescence Resonant Energy Transfer from a Cationic Conjugated Polyelectrolyte to Fluorescein-Labeled DNA in Aqueous Media (pages 499–504)

      Bin Liu and Guillermo C. Bazan

      Version of Record online: 15 MAR 2007 | DOI: 10.1002/asia.200600257

      Thumbnail image of graphical abstract

      What a turn-on! The fluorescence of the complex formed between a cationic water-soluble conjugated polyelectrolyte and fluorescein-labeled single-stranded DNA is turned on when it is dissolved in THF/buffer (green) rather than in aqueous buffer (black). Weaker polymer–DNA binding in and the lower dielectric constant of THF/buffer could be the reason.

    6. Variable-Temperature Powder X-ray Diffraction of Aromatic Carboxylic Acid and Carboxamide Cocrystals (pages 505–513)

      L. Sreenivas Reddy, Prashant M. Bhatt, Rahul Banerjee, Ashwini Nangia and Gert J. Kruger

      Version of Record online: 15 MAR 2007 | DOI: 10.1002/asia.200600359

      Thumbnail image of graphical abstract

      Another use for thermostats: In situ variable-temperature powder X-ray diffraction gives the optimum temperature for the successful cocrystallization of aromatic carboxylic acids and amides to form their 1:1 cocrystals. Excessive heating results in unwanted phase transitions.

    7. Glass Transitions of Ordinary and Heavy Water within Silica-Gel Nanopores (pages 514–520)

      Masaharu Oguni, Satoshi Maruyama, Kenji Wakabayashi and Atsushi Nagoe

      Version of Record online: 15 MAR 2007 | DOI: 10.1002/asia.200600362

      Thumbnail image of graphical abstract

      A glass of water? Adiabatic calorimetry shows that ordinary and heavy water confined within the nanospaces of silica gel crystallize in the bigger pores but remain liquid in the smaller ones. Two glass transitions occur for water in the smallest 1.1-nm pores, which are due to interfacial water molecules on the pore walls and internal “free” water.

    8. Development of a General and Efficient Iron-Catalyzed Epoxidation with Hydrogen Peroxide as Oxidant (pages 521–529)

      Bianca Bitterlich, Gopinathan Anilkumar, Feyissa Gadissa Gelalcha, Björn Spilker, Anne Grotevendt, Ralf Jackstell, Man Kin Tse and Matthias Beller

      Version of Record online: 14 MAR 2007 | DOI: 10.1002/asia.200600407

      Thumbnail image of graphical abstract

      The key lies in being green: By systematic variation of ligands, iron sources, and reaction conditions, a practical and inexpensive catalyst system for olefin epoxidation has been developed. High reactivity and excellent selectivity can be achieved for this environmentally benign process by using hydrogen peroxide.

    9. Conformational Polymorphism in N-(4′-methoxyphenyl)- 3-bromothiobenzamide (pages 530–538)

      Anastasiya Bashkirava, Philip C. Andrews, Peter C. Junk, Evan G. Robertson, Leone Spiccia and Nafty Vanderhoek

      Version of Record online: 15 MAR 2007 | DOI: 10.1002/asia.200600410

      Thumbnail image of graphical abstract

      Shape-shifting crystals: N-(4′-methoxyphenyl)-3-bromothiobenzamide can be crystallized as three conformational polymorphs. The yellow α form is slightly more stable than the yellow γ form, but the orange β form is the most stable at room temperature and least stable above 74 °C.

    10. Alkali-Metal Pyrazolate Complexes with Unusual Pyrazolate Coordination Modes and Pseudocubane Motifs (pages 539–550)

      Samar Beaini, Glen B. Deacon, Anja P. Erven, Peter C. Junk and David R. Turner

      Version of Record online: 15 MAR 2007 | DOI: 10.1002/asia.200700005

      Thumbnail image of graphical abstract

      Oddly bound: The synthesis and structural characterization of dimeric, tetranuclear, polymeric, pseudocubane, and oxo-centered M8 cage pyrazolate complexes illustrate the wide variety of coordination modes possible for pyrazolate ligands. Unusual modes include the contracted μ-η21 shown, as well as the μ3522, μ3521, and μ3421 modes with five-, six-, and seven-coordinate metal atoms.

  6. Preview

    1. Top of page
    2. Cover Picture
    3. Graphical Abstract
    4. Community Report
    5. Focus Review
    6. Full Papers
    7. Preview
    1. You have free access to this content
      Preview: Chem. Asian J. 5/2007 (page 555)

      Version of Record online: 27 MAR 2007 | DOI: 10.1002/asia.200790008

SEARCH

SEARCH BY CITATION