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Haruo Katayama, Seijiro Matsubara
2013 Volume 42 Issue 5 Pages
471-472
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013
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The copper-catalyzed conjugate addition of a Grignard reagent to an α,β-unsaturated ketone was performed in a microflow system. In the reaction using the microflow system, a chemoselective 1,4-addition reaction to an enone in the presence of a saturated ketone group proceeded successfully.
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Shunsuke Mieda, Misako Aida
2013 Volume 42 Issue 5 Pages
473-475
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013
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The macrodipole moment of a β-sheet depends on the number and length of β-strands, as well as whether it is parallel or antiparallel. Here, we propose the VSHBβ model, in which the dipole moments of amino acid residues are used as building blocks to predict the macrodipole moment of a β-sheet. Once a set of VSHBβ models is available, large-scale MO calculations will not be needed to obtain local dipole moments or macrodipole moments of large polypeptides in β-sheets.
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Ryo Ishimoto, Keigo Kamata, Noritaka Mizuno
2013 Volume 42 Issue 5 Pages
476-478
Published: May 05, 2013
Released: May 05, 2013
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Addition of TPA·Cl (TPA: tetra-
n-propylammonium) to a reaction mixture of H
2WO
4, H
2O
2, and HCl gave a novel all-inorganic mononuclear chloro oxo diperoxotungstate, TPA[WOCl(O
2)
2(H
2O)] (
I), which was characterized by X-ray crystallography, elemental analysis, and IR, Raman, UV–vis,
17O and
183W NMR spectroscopies, and CSI-MS. Compound
I acted as a good precursor for the high-yield synthesis of an active protonated tetranuclear peroxotungstate, TPA
3[H{W
2O
2(O
2)
4(µ-O)}
2].
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Kaihua Shen, Yanshai Wang, Yang Li
2013 Volume 42 Issue 5 Pages
479-480
Published: May 05, 2013
Released: May 05, 2013
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A simple, generalized method to prepare magnetite Fe
3O
4 nanocrystals based on the thermal decarboxylation of an admixture of iron(II) and iron(III) cetylsulfonylacetate is reported. This one-pot process exhibits well shape-controlled magnetite Fe
3O
4 nanocrystals—from nanoparticles to nanorods—by controlling the reaction temperature in the thermo-decarboxylation procedure.
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Shujun Zhou, Junzheng Wang, Ayae Sugawara-Narutaki, Atsushi Shimojima, ...
2013 Volume 42 Issue 5 Pages
481-482
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013
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Silica nanospheres (SNSs) synthesized with different base catalysts assemble into one-dimensional (1D) chain-like nanostructures at proper pH levels in the presence of the block copolymer F127. The addition of basic amino acids or the removal of base catalysts by dialysis influences the pH of 1D assembly. The base molecules affect assembly by modifying the electrostatic repulsion among the SNSs; however, they are not indispensable for this 1D assembly phenomenon.
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Tomoyasu Hirai, Masayuki Haraguchi, Atsushi Sakai, David P. Penaloza, ...
2013 Volume 42 Issue 5 Pages
483-485
Published: May 05, 2013
Released: May 05, 2013
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The incorporation of fluoro-containing moieties into polymers can significantly change their surface properties. In this study, we synthesized two polyacrylates with different fluoro-containing side chains to give a better understanding of how the water-sliding property of polymers can be controlled.
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Faqi Yu, Xinde Tang, Meishan Pei
2013 Volume 42 Issue 5 Pages
486-488
Published: May 05, 2013
Released: May 05, 2013
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A facile strategy for grafting poly(
N,
N-dimethylaminoethyl methacrylate) (PDMAEMA) on the surface of hydroxy carbonate apatite (HCA) nanoparticles via surface-initiated ATRP has been presented. SEM, FT-IR, TGA, N
2 adsorption–desorption analysis, and DLS were employed for their characterization. The results demonstrated that the stimuli-responsive polymer had been successfully grafted onto the surface of HCA. The stimuli-responsive brushes attached to HCA could act as a switch to control the opening and closing of the pore on the surface of HCA. In this paper, the pH-responsive property was mainly focused on.
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Norio Sakai, Yoshifumi Nonomura, Reiko Ikeda, Takeo Konakahara
2013 Volume 42 Issue 5 Pages
489-491
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013
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The efficient reductive etherification of aromatic or aliphatic aldehydes using a reducing system that combines Zn(OTf)
2 with either TMDS or Et
3SiH is described. The present reducing system can also be applied to the hydrosilylation of aromatic aldehydes having either a strong electron-withdrawing group or a pyridine ring.
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Yanbai Shen, Dezhou Wei, Mingyang Li, Wengang Liu, Shuling Gao, Cong H ...
2013 Volume 42 Issue 5 Pages
492-494
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013
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We demonstrate the microstructure and room-temperature H
2 sensing properties of undoped, Pt-doped, and Pd-doped SnO
2 nanowires (SNWs). SNWs with a tetragonal structure were synthesized by thermal evaporation of tin grains at 900 °C. Gas sensors based on undoped, Pt-doped, and Pd-doped SNWs showed a reversible response to H
2 at room temperature. The response was improved in the order undoped < Pt-doped < Pd-doped SNWs under the same conditions.
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Naoya Okiyama, Eriko Ota, Ayumi Sumino, Tomoyasu Noji, Katsuhiro Yamam ...
2013 Volume 42 Issue 5 Pages
495-497
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013
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We succeeded in preparing a fibrous nanotube of green fluorescent protein by conjugation with poly(2-vinylpyridine) and use of a microfluidic synthesis technique. By inducing a sudden pH change in the acidic solution (pH 4.5) by injection into a neutral buffer using a microsyringe, the fibrous nanotube could be selectively formed. Its diameter and length were about 200 nm and 1–10 µm, respectively.
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Yoshio Nakahara, Kazuki Machiya, Toshiyuki Sato, Ni Tar Nwe, Tetsuya F ...
2013 Volume 42 Issue 5 Pages
498-500
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013
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Novel water-dispersible, pH-stable, and biocompatible quantum dots were synthesized through the surface modification of silicon quantum dots (SiQDs) with monosaccharides. The presence of the monosaccharide on the surface of the SiQDs was recognized by fluorescence measurements using its complementary lectin (concanavalin A). The fluorescence cell imaging was carried out by using SiQDs functionalized chemically with
D-glucosamine, and it was shown that the SiQDs developed in this study are applicable as blue chromophores for biological fluorescence imaging.
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Masa-aki Morikawa, Ken Murata, Kazuo Yamada, Nobuo Kimizuka
2013 Volume 42 Issue 5 Pages
501-503
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013
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A novel amino acid derivative having two ferrocene units spontaneously forms regular microspheres in binary aqueous/tetrahydrofuran (THF) media. The size of the microspheres is controllable from nano to micro dimensions depending on the concentration and composition of the binary solvent. These microspheres display reversible redox properties, as characterized by cyclic voltammetry.
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Yoshiaki Matsuo, Katsuya Maeda
2013 Volume 42 Issue 5 Pages
504-506
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013
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Microporous pillared layered titanates with large surface areas were prepared through the pyrolysis of silylated layered titanate under various atmospheres. The sample containing some organic residues showed visible-light photocatalytic activity toward methanol decomposition.
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Toshitake Furusawa, Ikue Oshino, Kakeru Yoshida, Naho Oshiyama, Takahi ...
2013 Volume 42 Issue 5 Pages
507-508
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013
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Needle-like hydroxyapatites obtained through a hydration reaction process between anhydrous dicalcium phosphate (ADCP) and tetracalcium phosphate (TTCP) were reinforced with wheat starch to form composite blocks, and they showed mechanical properties corresponding to their compositions: mass fraction of calcium phosphate powders/starch solution and starch concentration. A kind of the composite granules was found to be osteoconductive in an in vivo examination with a rat model.
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Keo Vanthoeun, Kie Shimasaki, Yasuhiko Ono, Takayoshi Suzuki, Masakazu ...
2013 Volume 42 Issue 5 Pages
509-511
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013
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The surface tension of aqueous solution of sodium dodecyl sulfate (SDS) stayed constant by an addition of α-, β-, or γ-cyclodextrin (CD) since the 1:2 inclusion compound, SDS–2CDs, is formed. On the other hand, the addition of [Co(NH
3)
6](ClO
4)
3 into an aqueous solution of the above inclusion compound shows the characteristic drawing of SDS from CDs. The easiness of the drawing is shown as γ-CD > β-CD > α-CD due to the cavity size of CDs.
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Andre Shomorony, Rong Fan
2013 Volume 42 Issue 5 Pages
512-514
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013
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An immuno-DNA-directed assembly technique based on bifunctional conjugates of uniquely designed-ssDNA codes and antibodies specific to cell surface receptors enables rapid assembly of heterotypic cells into multicellular systems. It is a versatile and modular approach, and upon further development may find applications in microtissue engineering.
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Xiaochen Chen, Kensuke Fukushi
2013 Volume 42 Issue 5 Pages
515-517
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013
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Ammonium adsorption tests were performed to investigate comprehensively the adsorption of ammonium by soil during the land-treatment process of nutrient-enriched wastewater. Accordingly, the conceptual pattern of ammonium adsorption isotherms, as affected by the associated phosphate concentration, and the ratio of ammonium to phosphate and nutrient cations represented by potassium, is clearly illustrated. The findings contribute to a better understanding of the treatment effect and are a useful guide for the design of wastewater land-treatment systems.
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Shintarou Kishi, Tsutomu Hirakawa, Keita Sato, Asuka Komano, Chifumi K ...
2013 Volume 42 Issue 5 Pages
518-520
Published: May 05, 2013
Released: May 05, 2013
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Ethyl
S-diisopropylaminoethyl methylphosphonothioate (VX) in aqueous phase was decomposed by Ag– and Au–TiO
2 photocatalyst. Photocatalytic decomposition rate,
rVX, was accelerated in the order of Ag–TiO
2 > Au–TiO
2 > bare TiO
2 as a consequence of improving charge separation and increasing partial decomposition of VX molecular structure. It was suggested that the photocatalytic decomposition of VX molecule at the Au– and Ag–TiO
2 was carried out by C–N, P–S cleavage and oxygenation.
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Saithathul Fathimah Sameera, Padala Prabhakar Rao, Leela Sandhya Kumar ...
2013 Volume 42 Issue 5 Pages
521-523
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013
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New yellow inorganic pigments, (BiV)
1−x(YNb)
xO
4 with high NIR reflectance were synthesized by a conventional solid-state reaction method. The effect of isovalent dopants, namely, Y
3+ and Nb
5+ on BiVO
4 samples was characterized using powder X-ray diffractometer, scanning electron microscope, UV–vis–NIR diffuse reflectance spectrometer, and CIE 1976
L*a*b* color scales. The prepared pigments exhibit brilliant yellow colors with significant enhancement of NIR reflectance to 90.8% when compared to undoped BiVO
4 at the 1100 nm range. Further, the solid solutions allow fine tuning of the band gap displaying various yellow colors. The lattice distortion and reduction in particle size are responsible for the enhancement of the pigment characteristics. The above results indicate that these yellow pigments have potential to be used as cool colorants for roofs and automotives as energy-saving coatings.
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Umakant B. Patil, Abhilash S. Singh, Jayashree M. Nagarkar
2013 Volume 42 Issue 5 Pages
524-526
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013
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Nanoceria-catalyzed simple and efficient protocol for the
N-formylation of amines using formic acid at room temperature under solvent-free conditions shows high yield of desired product chemoselectivity and improvement in reaction time.
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Yuki Tsuji, Hiroyuki Ohno
2013 Volume 42 Issue 5 Pages
527-529
Published: May 05, 2013
Released: May 05, 2013
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Novel azolate-type ionic liquids (ILs), alkyltributylphosphonium benzimidazolates (alkyl chain: methyl, butyl, and octyl), were prepared by neutralization of the corresponding alkyltributylphosphonium hydroxides with benzimidazole. All the azolate-type ILs prepared here showed high ionic conductivities above 10
−3 S cm
−1 at 80 °C, and good thermal stability over 300 °C. They are expected to be useful platforms for functional ILs having good thermal stabilities.
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Yoshie Ishikawa, Yukiko Katou, Naoto Koshizaki, Qi Feng
2013 Volume 42 Issue 5 Pages
530-531
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013
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We have been studying a new method of pulsed-laser melting in liquid, which is a unique and promising technique for the fabrication of submicrometer-sized spherical particles of various materials. However, spherical particles sometimes did not form depending on the raw particles, even when we used the same material. In this study, we clarified experimentally that particle aggregation in a suspension is important for spherical particle formation, and we found that the addition of an electrolyte to induce particle aggregation effectively promotes spherical particle formation.
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Shin Yamamoto, Takayuki Higashii
2013 Volume 42 Issue 5 Pages
532-534
Published: May 05, 2013
Released: May 05, 2013
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The generation behavior and the molecular structure of a heat-stable salt arising from coexistence between formic acid and an amine component contained in a CO
2 solvent have been studied. The heat-stable salt is thought to be generated in a reversible endothermic reaction and reach reaction equilibrium in the amine solution. The heat-stable salt has been proven to be formamide of the amine that is believed to be generated in a dehydration reaction of ammonium formate.
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Kayoko Kataoka, Tatsuo Arai
2013 Volume 42 Issue 5 Pages
535-537
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 27, 2013
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An amphiphilic stilbene dendrimer exists as monomer in organic solvent, but forms molecular assemblies in neutral water exhibiting excimer fluorescence and undergoes cycloaddition even in highly diluted solution of 10
−6 M.
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Kanayo Nakada, Masaki Daini, Michinori Suginome
2013 Volume 42 Issue 5 Pages
538-540
Published: May 05, 2013
Released: May 05, 2013
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Alkynes tethered to a chloro(diisopropylamino)boryl group undergo palladium-catalyzed borylative coupling with styrenes and acrylates, giving substituted cyclic 1,3-dienylboronic acid derivatives in a stereoselective fashion.
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Takumi Yamaguchi, Yukiko Kamiya, Yeun-Mun Choo, Sayoko Yamamoto, Koich ...
2013 Volume 42 Issue 5 Pages
544-546
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013
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To achieve quantitative conformational characterization of oligosaccharides possessing branched structures with internal mobility, we developed a paramagnetic tagging protocol for NMR relaxation analysis. A nitroxide spin label was attached chemically to the reducing terminus of a specific high-mannose-type undecasaccharide that was overexpressed in genetically engineered yeast cells. This hybrid approach provides a source of long-distance atomic information, enabling detailed characterization of the conformational dynamics of the triantennary sugar chain that is involved in protein-fate-determination processes in cells.
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Kohei Endo, Sayuri Yakeishi, Daisuke Hamada, Takanori Shibata
2013 Volume 42 Issue 5 Pages
547-549
Published: May 05, 2013
Released: May 05, 2013
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Functionalization of BINOL-
mono-PHOS achieved the Cu-catalyzed highly asymmetric conjugate addition of organozinc reagents to enones. The incorporation of a bulky hydroxy group at the 3′-position of BINOL-
mono-PHOS dramatically improved the yield and enantioselectivity. The present novel BINOL-
mono-PHOS ligands are effective in the Cu-catalyzed asymmetric conjugate addition of organozinc reagents in both acyclic enones and cyclohexenone.
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Masao Morimoto, Yui Nishida, Tomoya Miura, Masahiro Murakami
2013 Volume 42 Issue 5 Pages
550-552
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013
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Two molecules of an isocyanate react with one molecule of a 1,3-diene in the presence of a nickel(0) catalyst to give a 6-substituted dihydropyrimidine-2,4-dione. A five-membered azanickelacyclic intermediate is initially generated through oxidative cyclization of a hetero-pair of the isocyanate and the 1,3-diene onto nickel(0). Another molecule of the isocyanate is subsequently incorporated therein and reductive elimination follows.
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Ryota Sakamoto, Shunsuke Katagiri, Hiroaki Maeda, Hiroshi Nishihara
2013 Volume 42 Issue 5 Pages
553-555
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013
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Bis(terpyridine)–iron(II) complex wires (the number of the complex units: 1–3) possessing triarylamine at the termini were fabricated on gold electrode. The electron-transfer rate constant between the triarylamine moiety and gold electrode was quantified by means of potential-step chronoamperometry, revealing that (1) triarylamine afforded fast electron transportation (i.e., large zero-distance rate constant
ket0) and that (2) the distance attenuation factor, β
d, was independent of the terminal redox site.
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Hiromasa Nishikiori, Kenta Todoroki, Daichi Natori, Rudi Agus Setiawan ...
2013 Volume 42 Issue 5 Pages
556-558
Published: May 05, 2013
Released: May 05, 2013
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8-Hydroxyquinoline (8-HQ)-dispersing titania gel films were prepared through a nitric acid-catalyzed sol–gel process and steam treatment. The complex was formed between the 8-HQ and the titania nanoparticle surface. A photocurrent was observed in electrodes containing the complex due to electron injection from the excited state of the complex into the titania conduction band. A larger amount of the complex was formed in titania electrodes containing zinc ions owing to its high electron affinity.
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Manami Yoshikawa, Sakiko Imigi, Kan Wakamatsu, Tetsuo Iwanaga, Shinji ...
2013 Volume 42 Issue 5 Pages
559-561
Published: May 05, 2013
Released: May 05, 2013
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Macrocyclic oligomers with five 1,8-anthrylene units and five diacetylene linkers were synthesized by successive coupling reactions. DFT calculations and variable temperature NMR measurements revealed that the cyclic framework is stained and fluxional, and each anthracene unit moves rapidly around all possible orientations.
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Masafumi Ueda, Yui Ogura, Yohji Misaki
2013 Volume 42 Issue 5 Pages
562-564
Published: May 05, 2013
Released: May 05, 2013
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Novel [5]radialenes with four 1,3-dithiol-2-ylidene (DT) units (
2) and ethylene analogs of [5]dendralene derivatives with five DT units (
3) were synthesized. Cyclic voltammetry revealed that
2 exhibited two pairs of two-electron redox processes, whereas the bis(methylthio) derivative of
3 (
3a) showed a simultaneous four-electron-transfer process.
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Masafumi Ueda, Takashi Shirahata, Yohji Misaki
2013 Volume 42 Issue 5 Pages
565-567
Published: May 05, 2013
Released: May 05, 2013
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Spectroelectrochemistry of [5]radialenes with five 1,3-dithiol-2-ylidenes (DTs) (
1) was carried out. The UV–vis–NIR spectra of
12+ suggest delocalization of two positive charges over three DT units. X-ray structure analysis of an oxygen adduct (
2)
2+(AsF
6−)
2(PhCl)
1.5 reveals that
22+ has a cyclopentadienide structure in the central five-membered ring.
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