著者

Genki Nakamura Kaori Narimatsu Yasuro Niidome Naotoshi Nakashima

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.36, no.9, pp.1140-1141, 2007-09-05 (Released:2007-08-11)

参考文献数

26

被引用文献数

43

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We describe the finding that green tea and catechins individually dissolve single-walled carbon nanotubes (SWNTs). UV–visible–near-IR absorption, photoluminescence, Raman spectroscopy, and atomic force microscopy were used to characterize the solubilized aqueous nanotube solutions.

著者

寺田 晃

出版者

The Chemical Society of Japan

雑誌

日本化學雜誌 (ISSN:03695387)

巻号頁・発行日

vol.81, no.5, pp.757-759, 1960

被引用文献数

1

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α-オキシ-β-メチルアミノ-P-オキシエチルベンゼンをばれいしょから分離したチロジナーゼで酸化すると,アドレノクロムが生成することを認めた。またその酸素吸収過程を測定した結果,時間とともに直線的に3原子の酸素を吸収することがわかった。ゆえにこの場合は,チロジンのチロジナーゼによる酸化と同様な機構で反応が進むと結論した。

著者

Yoshimune Nonomura Takehito Baba Takaaki Miyashita Takashi Maeno

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.40, no.12, pp.1426-1427, 2011-12-05 (Released:2011-12-03)

参考文献数

19

被引用文献数

2

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We evaluated the softness of various silicone elastomers installed on a tactile evaluation system. The softness of the elastomers was reflected by the vertical force when subjects pushed the elastomers with their fingers. The moving behavior depended on the elastic properties of the contacted objects; namely, a pushing pattern and a sliding pattern were observed for the soft and hard elastomers, respectively.

著者

Imanaka Tadayuki Takemoto Tadashi

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

2015

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Here we show that petroleum can be formed efficiently at normal temperatures and pressures from carbon dioxide and activated water. The oxygen nano-bubble containing water was treated with TiO₂ catalysis under UV irradiation. The activated water was mixed vigorously with kerosene or light oil and carbon dioxide to form an emulsion. The emulsion gradually separated into a two-phase solution. After phase separation, the volume of kerosene or light oil, depending on which oil was utilized, increased by 5 to 10 %.

著者

Yuki Nagao

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.5, pp.468-470, 2013-05-05 (Released:2013-05-05)

参考文献数

22

被引用文献数

6

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Three oligo[(1,2-propanediamine)-alt-(oxalic acid)] thin films were prepared on SiO2, R-plane sapphire, and MgO(100) substrates, and their proton conductivities were investigated. Conductivity depended on the substrate and varied from 4 × 10−3 to 1 × 10−4 S cm−1 under the same conditions (80% relative humidity and 298 K). The thin films between the R-plane (1102) sapphire and MgO(100) substrates showed different molecular oriented structures. The thin film on the sapphire substrate, which shows higher proton conductivity, has a structure oriented parallel to the substrate. The molecular orientation in the thin film could be correlated with the proton-transport properties.

著者

Taiki Miyazawa Keigo Matsuda Atsuhiro Fujimori Yoshimune Nonomura

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.40, no.11, pp.1262-1263, 2011-11-05 (Released:2011-10-15)

参考文献数

15

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Manganese oxide nanoparticles can be obtained simply by mixing surfactant/water/oil ternary systems containing dialkyldimethylammonium chloride, manganese(II) nitrate hexahydrate, and n-hexane. This finding is valuable in the design of a one-pot synthesis of nanoparticles from microemulsion systems.

著者

Akihito Konishi Yasukazu Hirao Kouzou Matsumoto Hiroyuki Kurata Takashi Kubo

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.130153, (Released:2013-05-18)

被引用文献数

52

---

The improved Scholl reaction allows for the direct cyclization of anthracene oligomers to give bisanthene, teranthene, and quarteranthene. Furthermore, a variety of π-expanded bisanthenes are obtained by the Diels–Alder cycloaddition of bisanthene with several arynes. These reactions would allow us to synthesize various size- and shape-controlled polyperiacenes.

著者

岡田 実 亀本 雄一郎

出版者

The Chemical Society of Japan

雑誌

日本化學雜誌 (ISSN:03695387)

巻号頁・発行日

vol.85, no.10, pp.641-642,A51, 1964

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希土類元素の迅速定量法開発の一環としてイットリウムの定量法を研究した。中性子照射によってイットリウムから16sec^80mY が生成することを利用する簡易定量法として,3×10¹¹n/cm²/secの原子炉中性子の14秒照射と,マルチチャネルγ線スペクトロメーター使用の4回の計数操作とによる方法を開発した。ジスプロシウムの妨害を減らすため,照射の際カドミウム容器を使った。本法でガドリナイトとサマルスカイトの中のイットリウムを定量した。起り得る妨害としてジルコニウム,ニオブ,およびネオンから高速中性子反応によって生ずる妨害放射能を検討し,いずれも小さいことがわかった。

著者

Sasaki Yoh Yamase Toshihiro Ohashi Yuji Sasada Yoshio

出版者

The Chemical Society of Japan

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.60, no.12, pp.4285-4290, 1987

被引用文献数

34

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The crystal structures of oxidized and photoreduced decatungstates are compared. Three specimens of decatungstate complexes were prepared in mixed solvents of H<SUB>2</SUB>O–CH<SUB>3</SUB>CN and were characterized by X-ray diffraction. Unit cell parameters are as follows: (C<SUB>6</SUB>H<SUB>16</SUB>N)<SUB>4</SUB>[W<SUB>10</SUB>O<SUB>32</SUB>]·2CH<SUB>3</SUB>CN; DECA <I>M<SUB>r</SUB></I>=2841.4, monoclinic, <I>P</I>2<SUB>1</SUB>⁄<I>n</I>, <I>a</I>=14.617(2), <I>b</I>=17.783(3), <I>c</I>=11.755(2) Å, β=100.27(2)°, <I>V</I>=3006.5(9) Å<SUP>3</SUP>, <I>Z</I>=2; (C<SUB>6</SUB>H<SUB>16</SUB>N)<SUB>4</SUB>[H<SUB>1.5</SUB>W<SUB>10</SUB>O<SUB>32</SUB>]·8H<SUB>2</SUB>O; RED1 <I>M<SUB>r</SUB></I>=2905.4, monoclinic, <I>P</I>2<SUB>1</SUB>⁄<I>n</I>, <I>a</I>=15.902(3), <I>b</I>=12.233(2), <I>c</I>=15.673(4) Å, β=93.76(2)°, <I>V</I>=3042(1), Å<SUP>3</SUP> <I>Z</I>=2; Na<SUB>4</SUB>[H<SUB>1.8</SUB>W<SUB>10</SUB>O<SUB>32</SUB>]·14H<SUB>2</SUB>O; RED2 <I>M<SUB>r</SUB></I>=2696.7, monoclinic, <I>C</I>2⁄<I>m</I>, <I>a</I>=16.123(5), <I>b</I>=12.636(3), <I>c</I>=12.168(4) Å, β=117.40(2)°, <I>V</I>=2202(1) Å<SUP>3</SUP>, <I>Z</I>=2; There is no obvious change in the anion frame among the three decatungstate complexes. Photoreduced decatungstates may coordinate protons which neutralize excess charge injected into anions. It is concluded that the structure of W<SUB>10</SUB>O<SUB>32</SUB> is not largely altered up to two-electron reduction.

著者

Nakamura Ikusei Aimoto Kohjiroh Fujimoto Kaoru Tominaga Hiro-o

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

no.3, pp.437-440, 1988

被引用文献数

2 2

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A nickel supported on active carbon catalyst was found to exhibit an excellent activity for transfer hydrocracking of diphenylpropane with tetralin at 400 °C. It is demonstrated that the catalytic transfer hydrogenation is effected by the reverse spillover of hydrogen atom over the active carbon.

著者

Takayama Tomoaki Iwase Akihide Kudo Akihiko

出版者

The Chemical Society of Japan

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

2015

被引用文献数

46

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Single-crystal KCaSrTa₅O₁₅ nanorods were successfully synthesized by a polymerized complex method. SEM and TEM observations revealed that the nanorods growing along with the c-axis of the tungsten bronze structure possessed 40–100 nm of a diameter and 100–300 nm of a length. Tb(0.03 atom%)-doped KCaSrTa₅O₁₅ nanorods gave a green luminescence due to the ⁵D₄→⁷F₆ and ⁵D₄→⁷F₅ transition of Tb³⁺, when the KCaSrTa₅O₁₅ host was excited. The intensity of the luminescence was much higher than that by polycrystalline KCaSrTa₅O₁₅ prepared by a solid-state reaction. This indicates that nonradiative deactivation at grain boundaries was suppressed in the KCaSrTa₅O₁₅ nanorods compared to the polycrystalline KCaSrTa₅O₁₅. NiO cocatalyst-loaded KCaSrTa₅O₁₅ nanorods split water into H₂ and O₂ with 6.6% of an apparent quantum yield at 254 nm. The efficiency was three times higher than that of the polycrystalline KCaSrTa₅O₁₅. The KCaSrTa₅O₁₅ nanorods also showed photocatalytic activity for CO₂ reduction, when a Ag-cocatalyst was loaded. Stoichiometric amounts of CO and H₂ as reduction products and O₂ as an oxidation product were obtained. The activity for CO₂ reduction was improved by adding NaHCO₃ into the reactant solution, giving about 90% of a CO selectivity (CO/(CO+H₂)).

著者

Shiina Isamu

出版者

The Chemical Society of Japan

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.87, no.2, pp.196-233, 2014

被引用文献数

40

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After initially establishing a novel cyclization reaction of ω-hydroxycarboxylic acids (seco-acids) using 4-trifluoromethylbenzoic anhydride (TFBA) and Lewis acid catalysts to form the corresponding lactones, we discovered a more advanced method for this transformation using 2-methyl-6-nitrobenzoic anhydride (MNBA) as a coupling reagent with nucleophilic catalysts. The latter lactonization is promoted by acyl-transfer catalysts, such as 4-(dimethylamino)pyridine (DMAP), 4-pyrrolidinylpyridine (PPY), and 4-(dimethylamino)pyridine <i>N</i>-oxide (DMAPO). (+)-Ricinelaidic acid lactone ((+)-<b>2</b>) was first synthesized by the TFBA-mediated cyclization with Lewis acid catalysts, while the <i>threo</i>-aleuritic acid lactone (<b>20</b>) was alternatively synthesized by the MNBA-mediated cyclization with acyl-transfer catalysts. Using this effective lactonization technology to form the ester linkage under mild conditions, we then demonstrated the preparation of various large-, medium-, and small-sized natural and unnatural lactones including (−)-cephalosporolide D ((−)-<b>3</b>), (−)-octalactin A ((−)-<b>4</b>), (−)-octalactin B ((−)-<b>25</b>), 2-epibotcinolide (<b>49</b>), (−)- and (+)-2-hydroxytetracosanolides ((−)-<b>77</b> and (+)-<b>77</b>), (−)- and (+)-2-hydroxy-24-oxooctacosanolides ((−)-<b>78</b> and (+)-<b>78</b>), (−)-tetrahydrolipstatin ((−)-THL, (−)-<b>117</b>), and the erythromycin A skeletons <b>103b</b>, <b>103c</b>, <b>104c</b>, and <b>105b</b>. The transition structures involved in the formation of the β-lactones from the corresponding 3-hydroxycarboxylic acids were then determined using DFT calculations at the B3LYP/6-31G*//B3LYP/6-31G* level, and the reactivity of several seco-acids was successfully predicted on the basis of the calculated thermodynamic properties of the transition structures.

著者

KAWASAKI Tsuneomi UCHIDA Mizuki KAIMORI Yoshiyasu SASAGAWA Taisuke MATSUMOTO Arimasa SOAI Kenso

出版者

The Chemical Society of Japan

雑誌

Chemistry letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.7, pp.711-713, 2013-07-05

参考文献数

44

被引用文献数

22

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5-Pyrimidyl alkanol with an enantiomeric excess of up to >99.5% was formed using chiral crystals of achiral tris(2-hydroxyethyl) 1,3,5-benzenetricarboxylate as a chiral initiator. In the enantioselective addition of diisopropylzinc to pyrimidine-5-carbaldehyde, the helicity of the molecular arrangement of achiral tricarboxylate in the crystalline state could be successfully used as a source of chirality to afford enantioenriched alkanol in conjunction with asymmetric autocatalysis with amplification of enantiomeric excess.

著者

Negishi Yuichi

出版者

The Chemical Society of Japan

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.87, no.3, pp.375-389, 2014

被引用文献数

53

---

Advances in developments in nanotechnology have encouraged the creation of highly functionalized nanomaterials. Thiolate-protected gold clusters (Au<i>_n</i>(SR)<i>_m</i>) less than 2 nm in size exhibit size-specific physical and chemical properties not observed in bulk metals. Therefore, they have attracted attention as functional units or building blocks in nanotechnology. The highly stable, magic Au<i>_n</i>(SR)<i>_m</i> clusters possess great potential as new nanomaterials. We are studying the following subjects related to magic Au<i>_n</i>(SR)<i>_m</i> clusters: (1) establishing methods to enhance their functionality, (2) developing high-resolution separation methods, and (3) utilizing the clusters as active sites in photocatalytic materials. Through these studies, we aim to create highly functional metal nanoclusters and apply them as highly active photocatalytic materials. The results of our efforts to date are summarized in this paper.

著者

Ueda Joichi Kadowaki Kyoko

出版者

The Chemical Society of Japan

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.56, no.7, pp.1968-1971, 1983

被引用文献数

1

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Procedures are described for the spectrophotometric determination of palladium and bismuth(III) with Semimethylxylenol Blue (SMXB). SMXB reacts with palladium and bismuth(III) to form reddish-violet 1:1 complexes. The optimum pH ranges for the color development are pH 1.0–1.7 for palladium and pH 1.0–1.4 for bismuth(III). The absorption maxima of the colored solutions lie at 565–568 nm and at 568–570 nm, respectively. Beer's law is obeyed over the range of 0.4–3.2 μg cm<SUP>−3</SUP> of palladium and 0.4–4.0 μg cm<SUP>−3</SUP> of bismuth(III), and the sensitivities of the determinations are 4.0×10<SUP>−3</SUP> μg Pd cm<SUP>−2</SUP> and 6.1×10<SUP>3</SUP> μg Bi cm<SUP>−2</SUP> for 0.001 of absorbance. For the palladium determination, gallium, tin(IV), bismuth(III), scandium, zirconium, and iron(III) interfere, but tin(IV), scandium, zirconium, and iron(III) can be masked by the addition of fluoride. For the bismuth(III) determination, gallium, tin(IV), scandium, zirconium, and iron(III) interfere, but the effect of iron(III) is eliminated by the addition of <small>L</small>-ascorbic acid, and tin(IV) and scandium can be masked by fluoride. A consecutive determination of palladium and bismuth(III) by the difference of the rates of color developments for their complexes was also studied.

著者

Tomoki Nishimura Takeshi Cho Andrew M. Kelley Magdalena E. Powell John S. Fossey Steven D. Bull Tony D. James Hiroyasu Masunaga Isamu Akiba Kazuo Sakurai

出版者

The Chemical Society of Japan

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

pp.1008170144, (Released:2010-08-21)

参考文献数

42

被引用文献数

10

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Synthetic DNA-transfection reagents can overcome safety issues raised by use of viral DNA vectors. One of these candidates is a cationic lipid that can form a supramolecular complex with DNA. We have been working in a series of aromatic diamine lipids with different tail length from C6 to C18: [N-(3,5-dialkylbenzyl)ethane-1,2-diamine, denoted DA] as such a lipid. The present paper describes the synthesis and the fundamental properties of DA. SAXS from DA solution showed bilayer vesicle formation, while it showed lamellar formation after the complexation with DNA. When we measured the N/P ratio (molar ratio of the amine groups (N) in DA to phosphate groups (P) in the DNA) dependence of SAXS, the lamellar peak (spacing = 5.0 nm) increased proportionally to the added DNA concentration at N/P ≥ 8. On the other hand, in the range of N/P < 8, the spacing was increased to 5.5 nm and the area decreased as DNA increased. These different features between N/P ≥ 8 and N/P < 8 suggest that the lamellar supramolecular structures differ according to the composition.

著者

Junji Kobayashi Yuya Domoto Takayuki Kawashima

出版者

The Chemical Society of Japan

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.39, no.2, pp.134-135, 2010-02-05 (Released:2010-01-23)

参考文献数

27

被引用文献数

10

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A fluorescent host molecule bearing a bicyclic triarylphosphate framework was synthesized. Its inclusion behavior to C60 was revealed by fluorescent titration. Cocrystallization of the host and C60 resulted in the formation of an inclusion complex in the crystalline state.

著者

Yasuhide Yukawa Yuho Tsuno

出版者

The Chemical Society of Japan

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.32, no.9, pp.965-971, 1959 (Released:2006-04-12)

参考文献数

27

被引用文献数

167

著者

守屋

出版者

The Chemical Society of Japan

雑誌

東京化學會誌 (ISSN:03718409)

巻号頁・発行日

no.14, pp.45a-45, 1893

著者

喜多 稔 外山 修之

出版者

The Chemical Society of Japan

雑誌

日本化學雜誌 (ISSN:03695387)

巻号頁・発行日

vol.81, no.3, pp.485-489, 1960

被引用文献数

5

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本邦産水産無脊椎動物のうち, 原索動物, 棘皮動物, 節犀動物, 軟体動物, 環形動物 25 種類から脂質 (2種類は油脂) を抽出しその不ケン化物およびステリンを定量し, また赤外線吸収を測定して 24-メチレンコレステリンの存否を判定し, 紫外部吸収を測定して, Δ<SUP>5</SUP><SUP>7</SUP>-ステリン (プロビタミジD) 含量を算出した。カリガネガイおよびホタテガイは末端メチレン基の存在を明瞭に示し, ピザラガイ綱に属する貝については末端メテレン基の吸収は認められない。従来ピザラガイ類には Δ<SUP>5, 7</SUP>-ステリンがほとんど含まれていないとされていたが, 今回の測定では相当量の, Δ<SUP>5, 7</SUP>-ステリンの存在が認められた。またカラスボヤ, ムラサキウニ, スガイ, クボガイは 255mμ に極大吸収を持っていることが知られた。ゴカクキンコからはバチルアルコールが単離され, ホタテガイからは粗 24-メチレンコレステリン区分とクリオナステリン区分が分離された。ゴカイの主要ステリンはコレステリンであることが確かめられた。