Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 40 , Issue 2
Showing 1-36 articles out of 36 articles from the selected issue
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  • Shuhei Higashibayashi, Hidehiro Sakurai
    2011 Volume 40 Issue 2 Pages 122-128
    Published: February 05, 2011
    Released: January 08, 2011
    JOURNALS FREE ACCESS
    Sumanene (C21H12) is a C3v symmetric buckybowl, which corresponds to a partial fullerene structure. Recent advances in the syntheses of sumanene and its derivatives, including heterasumanenes, are summarized in this review. Their chemical reactivities and derivatizations are also presented.
    The C3v symmetric buckybowl, sumanene (C21H12), is named after a flower in Hindi and Sanskrit. Just as its namesake, the chemistry of sumanene has begun to bloom. Recent advances in the syntheses of sumanene, heterasumanenes, and their derivatives are summarized in this review. Fullsize Image
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  • Yasushi Idemoto, Yuta Tsukada, Naoto Kitamura, Akinori Hoshikawa, Toru ...
    2011 Volume 40 Issue 2 Pages 168-170
    Published: February 05, 2011
    Released: January 15, 2011
    JOURNALS OPEN ACCESS
    In the present study, we performed a new ex situ analysis of the change in the crystal structure of a cathode containing the composite material in a coin cell during the charge–discharge cycle. Time-of-flight neutron powder diffraction with Rietveld refinement was used to analyze the crystal structure of LiNi0.8Co0.19Cu0.01O2 produced by solid-phase synthesis, both for the powder and a cathode before and after charging. The powder and the cathode had similar crystal structure parameters before charging. The results obtained demonstrate that crystal structure analysis by neutron diffraction is possible for a cathode containing 8.5 mg of active material. The results also showed that it is possible to quantitatively determine the Li composition, Li/Ni cation mixing amount, (Ni,Co,Cu)–O6 octahedral distortion, and small quantities of the second phase component in the cathode before and after charging.
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  • Kenichi Oyaizu, Takashi Sukegawa, Hiroyuki Nishide
    2011 Volume 40 Issue 2 Pages 184-185
    Published: February 05, 2011
    Released: January 15, 2011
    JOURNALS OPEN ACCESS
    An electrode-attached layer of poly(phenylacetylene) bearing a pendant nitronyl nitroxide group per repeating unit, obtained by the Rh-catalyzed polymerization of 2-(4-ethynylphenyl)-4,4,5,5-tetramethylimidazoline-l-oxyl 3-oxide, underwent oxidation and reduction at 0.80 and −0.84 V vs. Ag/AgCl, respectively. The magnetically determined unpaired electron density of 92% was coulometrically reproduced, which supported the presumption that the radical survived during the course of the polymerization to allow both positive and negative charging of the pristine neutral polymer substantially per repeating unit. Galvanostatic Coulomb titration revealed the charge storage capability of the polymer, which demonstrated usefulness as organic electrode-active material with unprecedented ambipolar chargeability.
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