Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
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Volume 78, Issue 3
Displaying 1-6 of 6 articles from this issue
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  • Synthesis of Amphiphilic Phthalocyanine Derivatives and Their Cyclic Voltammetry
    Keiichi SAKAMOTO, Eiko OHNO-OKUMURA, Masaki WATANABE, Taku KATO
    2005 Volume 78 Issue 3 Pages 101-111
    Published: March 20, 2005
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.78.101
    JOURNAL FREE ACCESS
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    Phthalocyanine analogues containing alkyl-substituted benzenoid rings and pyridine rings are interesting compounds, because quaternation of the pyridine nitrogen is expected to form cationic amphiphilic compounds.
    Non peripheral long alkyl substituted zinc phthalocyanine derivatives, zinc bis (1, 4-didecylbenzo) -bis (3, 4-pyrido) porphyrazine and zinc bis (1, 4-didecylbenzo) -bis (2, 3-pyrido) porphyrazine were reacted with dimethyl sulfate and monochloroacetic acid to give their quaternary products. Also the zinc phthalocyanine derivatives reacted with diethyl sulfate to afford the sufo-substituted products. All reacted compounds showed amphiphilic character.
    Regio isomers of zinc bis (1, 4-didecylbenzo) -bis (3, 4-pyrido) porphyrazine were also quaternized with dimethyl sulfate.
    Identical peaks in cyclic voltammograms appeared for the products before and after quaternation. It was thought that there was no effect of the quaternation of zinc bis (1, 4-didecylbenzo) -bis (3, 4-pyrido) porphyrazine or zinc bis (1, 4-didecylbenzo) -bis (2, 3-pyrido) porphyrazine on the redox properties of phthalocyanione analogous, because redox potentials did notchange.
    Regio isomers of zinc bis (1, 4-didecylbenzo) -bis (3, 4-pyrido) porphyrazine was reacted with dimethyl sulfate to give the corresponding methylated regio isomers.
    Cyclic voltammograms of the regio isomers were measured under the same condition for before and after the quaternation. The shapes of the cyclic voltammograms of quaternized regio isomers was the same as that of the corresponding non quaternation derivatives. After quaternation of regio isomers, the peaks of cyclic voltammograms were emphasized, which suggested that the photoelectron transfer ability was kept unchanged regardless of the quaternation.
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  • Antioxidant Activity of Noble Metal (Gold, Platinum) -Biopolymer Nanocomposites
    Shintaro AKIYAMA, Tomokazu YOSHIMURA, Kunio ESUMI
    2005 Volume 78 Issue 3 Pages 112-121
    Published: March 20, 2005
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.78.112
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    Three different gold-biopolymer nanocomposites have been prepared independently in the presence of tetrachloroauric acid and biopolymers like fucoidan, alginic acid and sodium hyaluronate via sodium borohydride reduction. The average particle size of gold nanoparticles using fucoidan becomes smaller, with a decrease of the concentration of fucoidan, ranging from 6.8 nm to 3.2 nm. On the other hand, the average particle sizes of the gold nanoparticles are 3.4 nm-5.4nm for alginic acid and sodium hyaluronate cases and independent of the biopolymer concentrations. The antioxidant activities of the gold-biopolymer nanocomposites upon elimination of hydroxyl radicals formed in an H2O2/FeSO4 system have been examined using a spin-trapping method. The gold-biopolymer nanocomposites exhibit high catalytic activities that are affected by the concentration and the kind of the biopolymer. The highest antioxidant activity obtained by the gold-alginic acid nanocomposites has been observed to be 60 times higher than that of ascorbic acid.
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  • Synthesis and Property of a Neodymium-Phenylene-Ytterbium Hybrid Terpolymer
    Hideo MATSUI, Keigo OTSUKI, Masakuni YOSHIHARA
    2005 Volume 78 Issue 3 Pages 122-124
    Published: March 20, 2005
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.78.122
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    A neodymium-phenylene-ytterbium hybrid terpolymer was synthesized by the reaction of 1, 4-hydroquinone with neodymium isopropoxide followed by the reaction with ytterbium isopropoxide. ESR spectra measurement showed that the terpolymer had a peak due to an organic free radical at 337mT (g=2. 003), of which intensity was higher than those of binary copolymers having neodymium-phenylene and ytterbium-phenylene units. This finding suggested that an electron transfer from the phenylene moiety to the ytterbium atom took place with electron-donating assistance by the neodymium atom.
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  • Analysis of the Polymer in the Solution by Static Light Scattering
    Kenichi YOSHIZAWA
    2005 Volume 78 Issue 3 Pages 125-130
    Published: March 20, 2005
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.78.125
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  • Interfacial Analysis and Bonding Mechanism between Polymer and Metal Related to Electronics Materials
    Shigeyoshi MAEDA
    2005 Volume 78 Issue 3 Pages 131-139
    Published: March 20, 2005
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.78.131
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  • Introduction to Dispersant for Pigment Dispersion
    Yoshinori KUSHI
    2005 Volume 78 Issue 3 Pages 141-148
    Published: March 20, 2005
    Released on J-STAGE: November 20, 2012
    DOIhttps://doi.org/10.4011/shikizai1937.78.141
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