Journal issue
Volume 42
, Issue 5
Showing 1-38 articles out of 38 articles from the selected issue
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Highlight Review
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Shohei Tashiro, Mitsuhiko Shionoya2013 Volume 42 Issue 5 Pages 456-462
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 25, 2013JOURNALS FREE ACCESSInspired by vital roles of metal ions as structure-stabilizing and regulating factors in biological systems, a great number of synthetic metallopeptides have been developed. This review focuses on metal-mediated stabilization and stimuli-responsive regulation of their secondary and higher-order structures by taking advantage of the characteristics of metal ions such as Lewis acidity, ligand-exchange ability, and redox properties.
Metal ions play vital roles in stabilizing and regulating higher-order structures of biomacromolecules. This review focuses on molecular design of synthetic metallopeptides whose structures and functions are stimuli-responsive. In the cases discussed here, secondary structures of the peptides are effectively induced and regulated with the characteristics of metal ions such as Lewis acidity, ligand-exchange ability, and redox property. Fullsize ImageView full abstract
Letter
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Ryo Sasai, Koichiro Hirata2013 Volume 42 Issue 5 Pages 463-464
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialTungsten was selectively recovered from wastewater containing W and Mo, as crystalline tungsten trioxide, by hydrothermal treatment. The optimal hydrothermal conditions for selective recovery of W involved treatment at 503 K for more than 8 h after adjusting the initial pH of the wastewater to 4.View full abstract -
Nami Sugiyama, Yusuke Yanagi, Masahiro Yoshizawa-Fujita, Mamoru Aizawa ...2013 Volume 42 Issue 5 Pages 465-467
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013JOURNALS RESTRICTED ACCESSBiphasic calcium phosphate (BCP) ceramics with well-controlled pores were fabricated by sintering mixtures of synthetic hydroxyapatite (HAp) and deoxyribonucleic acid (DNA). BCP ceramics with macro- and micropores revealed excellent cell proliferation as a result of suitable surface topography and phase composition.View full abstract
Editor’s Choice
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Yuki Nagao2013 Volume 42 Issue 5 Pages 468-470
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013JOURNALS OPEN ACCESS
Supplementary materialThree 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.View full abstract
Letter
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Haruo Katayama, Seijiro Matsubara2013 Volume 42 Issue 5 Pages 471-472
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013JOURNALS RESTRICTED ACCESSThe 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.View full abstract -
Shunsuke Mieda, Misako Aida2013 Volume 42 Issue 5 Pages 473-475
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013JOURNALS OPEN ACCESS
Supplementary materialThe 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.View full abstract -
Ryo Ishimoto, Keigo Kamata, Noritaka Mizuno2013 Volume 42 Issue 5 Pages 476-478
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialAddition of TPA·Cl (TPA: tetra-n-propylammonium) to a reaction mixture of H2WO4, H2O2, and HCl gave a novel all-inorganic mononuclear chloro oxo diperoxotungstate, TPA[WOCl(O2)2(H2O)] (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, TPA3[H{W2O2(O2)4(µ-O)}2].View full abstract -
Kaihua Shen, Yanshai Wang, Yang Li2013 Volume 42 Issue 5 Pages 479-480
Published: May 05, 2013
Released: May 05, 2013
JOURNALS RESTRICTED ACCESSA simple, generalized method to prepare magnetite Fe3O4 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 Fe3O4 nanocrystals—from nanoparticles to nanorods—by controlling the reaction temperature in the thermo-decarboxylation procedure.View full abstract -
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, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialSilica 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.View full abstract -
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
[Advance publication] Released: March 19, 2013JOURNALS RESTRICTED ACCESSThe 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.View full abstract -
Faqi Yu, Xinde Tang, Meishan Pei2013 Volume 42 Issue 5 Pages 486-488
Published: May 05, 2013
Released: May 05, 2013
JOURNALS RESTRICTED ACCESS
Supplementary materialA 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, N2 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.View full abstract -
Norio Sakai, Yoshifumi Nonomura, Reiko Ikeda, Takeo Konakahara2013 Volume 42 Issue 5 Pages 489-491
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013JOURNALS RESTRICTED ACCESSThe efficient reductive etherification of aromatic or aliphatic aldehydes using a reducing system that combines Zn(OTf)2 with either TMDS or Et3SiH 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.View full abstract -
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, 2013JOURNALS RESTRICTED ACCESSWe demonstrate the microstructure and room-temperature H2 sensing properties of undoped, Pt-doped, and Pd-doped SnO2 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 H2 at room temperature. The response was improved in the order undoped < Pt-doped < Pd-doped SNWs under the same conditions.View full abstract -
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, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialWe 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.View full abstract -
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, 2013JOURNALS RESTRICTED ACCESSNovel 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.View full abstract -
Masa-aki Morikawa, Ken Murata, Kazuo Yamada, Nobuo Kimizuka2013 Volume 42 Issue 5 Pages 501-503
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialA 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.View full abstract -
Yoshiaki Matsuo, Katsuya Maeda2013 Volume 42 Issue 5 Pages 504-506
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013JOURNALS RESTRICTED ACCESSMicroporous 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.View full abstract -
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, 2013JOURNALS RESTRICTED ACCESSNeedle-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.View full abstract -
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, 2013JOURNALS RESTRICTED ACCESSThe 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(NH3)6](ClO4)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.View full abstract -
Andre Shomorony, Rong Fan2013 Volume 42 Issue 5 Pages 512-514
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialAn 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.View full abstract -
Xiaochen Chen, Kensuke Fukushi2013 Volume 42 Issue 5 Pages 515-517
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013JOURNALS RESTRICTED ACCESSAmmonium 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.View full abstract -
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
JOURNALS RESTRICTED ACCESSEthyl S-diisopropylaminoethyl methylphosphonothioate (VX) in aqueous phase was decomposed by Ag– and Au–TiO2 photocatalyst. Photocatalytic decomposition rate, rVX, was accelerated in the order of Ag–TiO2 > Au–TiO2 > bare TiO2 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–TiO2 was carried out by C–N, P–S cleavage and oxygenation.View full abstract -
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, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialNew yellow inorganic pigments, (BiV)1−x(YNb)xO4 with high NIR reflectance were synthesized by a conventional solid-state reaction method. The effect of isovalent dopants, namely, Y3+ and Nb5+ on BiVO4 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 BiVO4 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.View full abstract -
Umakant B. Patil, Abhilash S. Singh, Jayashree M. Nagarkar2013 Volume 42 Issue 5 Pages 524-526
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialNanoceria-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.View full abstract -
Yuki Tsuji, Hiroyuki Ohno2013 Volume 42 Issue 5 Pages 527-529
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 19, 2013JOURNALS RESTRICTED ACCESSNovel 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.View full abstract -
Yoshie Ishikawa, Yukiko Katou, Naoto Koshizaki, Qi Feng2013 Volume 42 Issue 5 Pages 530-531
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: March 22, 2013JOURNALS OPEN ACCESSWe 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.View full abstract -
Shin Yamamoto, Takayuki Higashii2013 Volume 42 Issue 5 Pages 532-534
Published: May 05, 2013
Released: May 05, 2013
JOURNALS RESTRICTED ACCESS
Supplementary materialThe generation behavior and the molecular structure of a heat-stable salt arising from coexistence between formic acid and an amine component contained in a CO2 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.View full abstract -
Kayoko Kataoka, Tatsuo Arai2013 Volume 42 Issue 5 Pages 535-537
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 27, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialAn 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.View full abstract -
Kanayo Nakada, Masaki Daini, Michinori Suginome2013 Volume 42 Issue 5 Pages 538-540
Published: May 05, 2013
Released: May 05, 2013
JOURNALS RESTRICTED ACCESS
Supplementary materialAlkynes 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.View full abstract
Editor’s Choice
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Masashi Koyanagi, Nils Eichenauer, Hideki Ihara, Takeshi Yamamoto, Mic ...2013 Volume 42 Issue 5 Pages 541-543
Published: May 05, 2013
Released: May 05, 2013
JOURNALS OPEN ACCESS
Supplementary materialAnthranilamide (AAM)-masked o-iodoarylboronic acids were prepared from AAM-masked arylboronic acids via Ru-catalyzed o-C–H silylation, followed by iododesilylation with ICl. The Suzuki–Miyaura coupling of AAM-masked o-haloarylboronic acids with arylboronic acids proceeded under ligand-free conditions. Oligo(o-phenylene)s and oligo(naphthalene-2,3-diyl)s were synthesized via iterative Suzuki–Miyaura coupling sequences.View full abstract
Letter
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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, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialTo 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.View full abstract -
Kohei Endo, Sayuri Yakeishi, Daisuke Hamada, Takanori Shibata2013 Volume 42 Issue 5 Pages 547-549
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialFunctionalization 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.View full abstract -
Masao Morimoto, Yui Nishida, Tomoya Miura, Masahiro Murakami2013 Volume 42 Issue 5 Pages 550-552
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialTwo 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.View full abstract -
Ryota Sakamoto, Shunsuke Katagiri, Hiroaki Maeda, Hiroshi Nishihara2013 Volume 42 Issue 5 Pages 553-555
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialBis(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, βd, was independent of the terminal redox site.View full abstract -
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
JOURNALS RESTRICTED ACCESS8-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.View full abstract -
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
[Advance publication] Released: April 24, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialMacrocyclic 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.View full abstract -
Masafumi Ueda, Yui Ogura, Yohji Misaki2013 Volume 42 Issue 5 Pages 562-564
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialNovel [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.View full abstract -
Masafumi Ueda, Takashi Shirahata, Yohji Misaki2013 Volume 42 Issue 5 Pages 565-567
Published: May 05, 2013
Released: May 05, 2013
[Advance publication] Released: April 24, 2013JOURNALS RESTRICTED ACCESS
Supplementary materialSpectroelectrochemistry 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+(AsF6−)2(PhCl)1.5 reveals that 22+ has a cyclopentadienide structure in the central five-membered ring.View full abstract
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