Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 46 , Issue 1
Showing 1-44 articles out of 44 articles from the selected issue
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  • Michael D. Ward, Christopher A. Hunter, Nicholas H. Williams
    2017 Volume 46 Issue 1 Pages 2-9
    Published: January 05, 2017
    Released: January 31, 2017
    JOURNALS RESTRICTED ACCESS

    An M8L12 coordination cage, which is water-soluble but has a hydrophobic interior cavity, is an effective host for a wide range of small organic guests; the factors responsible for guest binding have been investigated in detail. Benzisoxazole is a competent guest and, when bound, undergoes the Kemp elimination reaction with a rate acceleration of up to 2 × 105 times compared to the reaction of unbound benzisoxazole; the reasons for this have been analyzed.

    An M8L12 coordination cage, which is water-soluble but has a hydrophobic interior cavity, is an effective host for a wide range of small organic guests; the factors responsible for guest binding have been investigated in detail. Benzisoxazole is a competent guest and, when bound, undergoes the Kemp elimination reaction with a rate acceleration of up to 2 × 105 times compared to reaction of unbound benzisoxazole; the reasons for this have been analyzed.
  • Sunri Lee, Takuji Ogawa
    2017 Volume 46 Issue 1 Pages 10-18
    Published: January 05, 2017
    Released: January 31, 2017
    JOURNALS RESTRICTED ACCESS

    This review highlights the effective design criteria for lanthanide single-molecule magnets, which show strong magnetic blocking temperature up to 60 K. Increase in the anisotropy barrier and decrease in the quantum magnetization are attainable by controlling the ligand field, local molecular symmetry related to the coordination geometry of the complex, and magnetic dipole–dipole interactions between the lanthanide ions. With recent advances in this field, a new 2-coordinate complex, which is predicted to show a blocking temperature of more than 77 K, is also introduced. The existence of a proton in the nitrogen atom of porphyrin ligands quenches the single-molecule magnet because of the destruction of the symmetry, which can be possibly overlooked because of the disorder of the position of the proton in the crystals.

    This review highlights the effective design criteria for lanthanide single-molecule magnets. Increase in the anisotropy barrier and decrease in quantum magnetization can be attained by controlling the ligand field, local molecular symmetry related to the coordination geometry of the complex, and magnetic dipole–dipole interaction between the lanthanide ions.
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  • Shuta Yuge, Motofusa Akiyama, Makoto Ishii, Ho Namkoong, Kazuma Yagi, ...
    2017 Volume 46 Issue 1 Pages 95-97
    Published: January 05, 2017
    Released: January 31, 2017
    JOURNALS RESTRICTED ACCESS

    We report the synthesis, structure, and influenza A virus trapping capability of protein nanotubes with an internal wall of fetuin glycoprotein. The nanotubes were fabricated via the alternating layer-by-layer assembly of human serum albumin (HSA), poly-l-arginine (PLA), and fetuin into a track-etched polycarbonate (PC) membrane (pore size, 800 nm), followed by dissolution of the PC template. In an aqueous medium, the (PLA/HSA)5PLA/fetuin nanotubes captured influenza A virus PR8 (H1N1) efficiently, as revealed by ELISA measurements.

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  • Patcharin Kaewmati, Qitao Tan, Shuhei Higashibayashi, Yumi Yakiyama, H ...
    2017 Volume 46 Issue 1 Pages 146-148
    Published: January 05, 2017
    Released: January 31, 2017
    JOURNALS RESTRICTED ACCESS

    C3-symmetric chiral triaryltriazasumanenes were successfully prepared in good yields by Pd-catalyzed cross-coupling reactions of chiral tris(methylthio)triazasumanene with various arylboronic acids. These chiral triaryltriazasumanenes showed very stable bowl chirality without racemization at room temperature. Single-crystal X-ray crystallography of the p-(trifluoromethyl)phenyl derivative revealed the formation of unidirectional π–π stacking columns that were connected by F•••F interactions unlike the non-columnar crystal packing of tris(methanesulfonyl)triazasumanene.

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