Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 43 , Issue 8
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  • Yuya Hamaguchi, Satoshi Fujinaga, Shunpei Murakami, Masahiko Hashimoto ...
    2014 Volume 43 Issue 8 Pages 1318-1320
    Published: August 05, 2014
    Released: August 05, 2014
    [Advance publication] Released: May 15, 2014
    JOURNALS RESTRICTED ACCESS
    An open-tubular capillary chromatography system was developed using an annular and sluggish flow system in a ternary water–acetonitrile–ethyl acetate mixed solvent as carrier solution. Fused-silica capillary tubes with different inner diameters of 75 and 200 µm were used. The smaller tube was inserted into the larger tube using a T-type joint. Water–acetonitrile and acetonitrile–ethyl acetate mixed solutions were delivered to the smaller and larger tubes, respectively, and then combined at the other end of the smaller tube located in the larger tube, generating annular and sluggish flows in the water–acetonitrile–ethyl acetate ternary mixed solution (2:5:3 and 2:4:3 (v/v/v), respectively). The annular flow comprised the organic solvent-rich inner and water-rich outer phases and the sluggish flow comprised the organic solvent-rich sluggish domain and water-rich continuous phases. A model analyte mixed solution of 1-naphthol (hydrophobic) and 2,6-naphthalenedisulfonic acid (hydrophilic) were injected into the smaller tube and proceeded to the annular or sluggish flow in the larger tube, where they were separated and detected in that order. As observed, the annular and sluggish flows in the microspace could be used for separation without any specific treatments such as tube packing or coating.
  • Satoshi Muratsugu, Shunichi Tajima, Mizuki Tada
    2014 Volume 43 Issue 8 Pages 1321-1323
    Published: August 05, 2014
    Released: August 05, 2014
    [Advance publication] Released: May 16, 2014
    JOURNALS OPEN ACCESS
    Oxide-supported heterometallic complex structures were prepared by the impregnation of three different oxide supports with [Rh2Mo(η5-C5Me5)2(S2C6H4)2(CO)2] through a CO exchange reaction with surface hydroxy groups. The original structural framework of the heterometallic complex with two Rh–Mo heterometal bonds was maintained on SiO2 and γ-Al2O3, while the original complex structure was not maintained on TiO2; these structures were investigated by FT-IR, DR-UV–vis spectroscopy, and Mo/Rh K-edge EXAFS. Highly dispersed RhMo nanoclusters were obtained by heating the oxide-supported complexes in vacuum followed by treatment with H2 at 773 K. The RhMo nanoclusters on TiO2 exhibited the highest activity for the oxidation of benzyl alcohol with O2.
  • Hiroki Ohara, Atsushi Kobayashi, Masako Kato
    2014 Volume 43 Issue 8 Pages 1324-1326
    Published: August 05, 2014
    Released: August 05, 2014
    [Advance publication] Released: May 16, 2014
    JOURNALS RESTRICTED ACCESS
    Highly luminescent mononuclear copper(I)–iodide complexes [CuI(PPh3)2(L)] have been synthesized by simple manual grinding of copper(I) iodide, PPh3, and N-heteroaromatic ligands (L = isoquinoline, 1,6-naphthyridine, and pyridine). They exhibit different colors of luminescence depending on L affording very high quantum yields (0.63–0.99).
  • Koji Nemoto, Ken-ichi Tominaga, Kazuhiko Sato
    2014 Volume 43 Issue 8 Pages 1327-1329
    Published: August 05, 2014
    Released: August 05, 2014
    [Advance publication] Released: May 17, 2014
    JOURNALS RESTRICTED ACCESS
    Use of a combination of Brønsted acid and Lewis acid directly afforded methyl levulinate in good yield from various raw lignocellulosic biomass resources.
  • Michihiro Shirakawa, Norifumi Fujita, Akihiko Takada, Seiji Shinkai
    2014 Volume 43 Issue 8 Pages 1330-1332
    Published: August 05, 2014
    Released: August 05, 2014
    JOURNALS OPEN ACCESS
    A low-molecular-weight gel prepared from a Cu complex of a protoporphyrin IX derivative exhibits an unusual elastic behavior as revealed by rheological studies. It possesses rubber elasticity despite the formation of LMOG by noncovalent molecular stacking. This is due to the feature of the present system that the gel fibers behave similarly to covalent polymers without bundling.
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