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Volume 42, Issue 1
Displaying 1-32 of 32 articles from this issue
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Highlight Review
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Yasuchika Hasegawa2013 Volume 42 Issue 1 Pages 2-7
Published: January 05, 2013
Released on J-STAGE: December 15, 2012
JOURNAL FREE ACCESSMagnetic semiconductor nanocrystals composed of lanthanoid ions, europium chalcogenide nanocrystals (EuX: EuO, EuS, and EuSe nanocrystals), are characterized by the narrow 4f orbitals that exist as degenerate levels between the conduction band [5d orbitals of Eu(II)] and the valence band (p orbitals of O2−, S2−, and Se2−). In this review, syntheses and characteristic photophysical properties of EuX nanocrystals are introduced. EuX nanocrystals are expected to be useful in applications such as future optical isolators, optomagnetic and spintronic devices.View full abstract
Letter
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Xiang Li, Hanwei Zhu, Anjie Wang, Yao Wang, Yongying Chen2013 Volume 42 Issue 1 Pages 8-10
Published: January 05, 2013
Released on J-STAGE: December 15, 2012
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Supplementary materialWO3/γ-Al2O3 exhibited a lower activity than WO3/SiO2 in oxidative desulfurization (ODS) of dibenzothiophene using cumene hydroperoxide as the oxidant. This could be a result of the strong interaction between WO3 and γ-Al2O3. The crystalline WO3 was more active than the tetrahedrally coordinated tungsten oxide species bound on the surface of γ-Al2O3. The loss of WO3 was negligible for WO3/SiO2 after the reaction. These features make SiO2 a promising support for the supported WO3 ODS catalyst.View full abstract -
Youan Lei2013 Volume 42 Issue 1 Pages 11-13
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialA facile technique is described here that can separate carbon nanotubes (CNTs) from corrosive CNTs/acid mixtures. The total time by flocculation method is ca. 0.5 h, which is only 5%, 20%, and 50% of that for dialysis, membrane filtration, and high-speed centrifugation. This strategy is a “green” process because our approach can recycle the “wasted acids.” Transmission electron microscopy (TEM) and contact angle measurement also show that the transition of surface properties of nanotubes plays a significant role in the separation of CNTs.View full abstract -
Hyangmi Jung, Hidenori Ohashi, Takanori Tamaki, Takeo Yamaguchi2013 Volume 42 Issue 1 Pages 14-16
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
JOURNAL OPEN ACCESS
Supplementary materialIn this study, hydroxide ion mobility is reduced by controlling water movement in the membrane to improve its stability. The water movement was decreased by structuring the water with pore-filling membranes synthesized by confining an anion-exchange polymer in nanopores of a porous substrate. Compared with bare films of the same polymer, the pore-filling membranes showed higher stability subsequent to immersion in water at 100 °C.View full abstract -
Shoko Suzuki, Ryota Sakamoto, Hiroshi Nishihara2013 Volume 42 Issue 1 Pages 17-18
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary material[Ru(tpy)(picSO)]BF4 (tpy: 2,2′:6′,2′′-terpyridine, picSO: 6-[(methylsulfinyl)methyl]picolinate) undergoes profound linkage isomerization behavior between stable S-bound and metastable O-bound isomers. S-[RuII(tpy)(picSO)]BF4 experiences photoisomerization to O-[RuII(tpy)(picSO)]BF4 upon irradiation with 436 nm light, whereas the back reaction is triggered with 546 nm light. Electrochemical linkage isomerization also takes place.View full abstract -
Yoshihiro Yasutani, Akinori Saeki, Takahiro Fukumatsu, Yoshiko Koizumi ...2013 Volume 42 Issue 1 Pages 19-21
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialThe impacts of solvent and thermal annealing on the mobility and photogeneration efficiency of free charge carriers in regioregular poly(3-hexylthiophene) were investigated by flash-photolysis time-resolved microwave conductivity measurements, transient absorption spectroscopy of the perylenediimide radical anion, and photocurrent measurements of a comb-type interdigitated electrode. A respectable high mobility of 0.62 cm2 V−1 s−1 was found as a three-dimensional value, highlighting the unprecedented electronic nature of the conjugated polymer.View full abstract -
Koji Naoda, Hirotaka Mori, Atsuhiro Osuka2013 Volume 42 Issue 1 Pages 22-24
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialSelective mono- and bis-Au(III) metalations of [26]hexaphyrins(1.1.1.1.1.1) were achieved in a 4:1 mixture of CH2Cl2 and methanol by using Na[AuCl4] as a Au(III) ion source and Ag3PO4 and Ag2CO3 as Au(III)-activating reagents.View full abstract -
Hidekazu Nakao, Takeshi Maeda, Hiroyuki Nakazumi2013 Volume 42 Issue 1 Pages 25-27
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialNovel π-extended squarylium dyes with dicyanovinylene substitution were synthesized through the Stille-type Pd-catalyzed cross-coupling reaction of a precursory iodinated squarylium dye with tributylstannyl squarate. Dye-sensitized solar cells (DSSCs) based on the squarylium dyes displayed remarkable performances in a wide wavelength range from the visible to the near-infrared region around 800 nm. The power conversion efficiencies of the DSSCs based on In-CN-In-S-OH and In-CN-In-S-In-COOH reached 3.5% and 2.1%, respectively.View full abstract -
Yasuhisa Uneme, Shinji Tamura, Nobuhito Imanaka2013 Volume 42 Issue 1 Pages 28-30
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
JOURNAL RESTRICTED ACCESSA solid electrolyte-type SO2 gas sensor was fabricated by the combination of the tetravalent Zr4+-conducting Zr39/40TaP2.9W0.1O12 and the O2−-conducting (ZrO2)0.92(Y2O3)0.08 solid electrolytes with the 0.6La2O2SO4–0.4Li2SO4 auxiliary sensing electrode. Since the present sensor showed a continuous, quantitative, and reproducible response, which obeys the theoretical Nernst relationship, over a month, it is expected to be a suitable candidate as a practical SO2 gas-monitoring tool.View full abstract -
Mohammad Al-Mamun, Jung-Hyurk Lim, Yung-Eun Sung, Sung-Ryong Kim2013 Volume 42 Issue 1 Pages 31-33
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
JOURNAL RESTRICTED ACCESSComposites of a few layers of graphene (G) with different loadings of Au nanoparticles (NPs) were used as counter electrodes for dye-sensitized solar cells. Simple solution coating followed by a post thermal treatment was employed for the preparation of the counter electrodes. The graphene composite electrode with 30 nM Au NPs showed a 6.55% higher conversion efficiency (η = 1.79%) and 200 mV higher open-circuit voltage (0.60 V) than cells fabricated with sputtered Pt electrodes. The better electrocatalytic activity of the composite electrode was also reflected in the sharp reduction peaks observed in the cyclic voltammogram.View full abstract -
Toshihiko Tanaka, Masamitsu Ishitobi, Shinya Matsumoto2013 Volume 42 Issue 1 Pages 34-36
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialMolecular thin films have been prepared by depositing 6 pyrazine dyes separately through evaporation on aligned poly(tetrafluoroethylene) (PTFE) layers. An asymmetric dye having an indolinylidene group provides oriented films in which the transition moments are parallel to the PTFE chains. A symmetric dye with four end alkyl chains in turn provides oriented films in which the moment is perpendicular to the chains. The directions of dye molecules in those films are discussed according to their calculated molecular orbitals. Three other symmetric dyes provide slightly oriented films.View full abstract -
Artur R. Abreu, Andreia F. Peixoto, Ana R. Almeida, Mirtha A. O. Loure ...2013 Volume 42 Issue 1 Pages 37-39
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialChiral bis-MOP-type diphosphines with alkyl and pyridyl bridges connecting the two binaphthyl units have been synthesized via [NiCl2(dppe)]-assisted phosphination of the corresponding aryl triflates. The effect of the amount of the nickel complex on the reaction yield was investigated. Catalytic and even stoichiometric amounts of the complex proved to be insufficient to promote an efficient phosphination, but the use of an excess of the metal complex provides good yields.View full abstract -
Satoshi Ueno, Ryohei Maeda, Shohei Yasuoka, Ryoichi Kuwano2013 Volume 42 Issue 1 Pages 40-42
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialAmination at the β-position of 2-arylpropionitriles through catalytic dehydrogenation occurred by using [PdCl2(PMe3)2] catalyst and bromobenzene. This is the first catalytic reaction involving the direct dehydrogenation of saturated nitriles.View full abstract -
Shin-ya Tashita, Takahito Watanabe, Hiromi Tobita2013 Volume 42 Issue 1 Pages 43-44
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialAn NHC-stabilized (chlorogermyl)metallogermylene [Cp(CO)3WGe{GeCl(Mes)2}(MeIiPr)] (NHC: N-heterocyclic carbene, MeIiPr: 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene, Mes: mesityl) was synthesized by the reaction of [Na(dme)2][CpW(CO)3] (dme: 1,2-dimethoxyethane) with (chlorogermyl)chlorogermylene [GeCl{GeCl(Mes)2}(MeIiPr)]. Irradiation to a solution of the metallogermylene with an Hg lamp afforded an NHC-stabilized (chlorogermyl)germylyne complex [Cp(CO)2W≡Ge{GeCl(Mes)2}(MeIiPr)].View full abstract -
Kenta Shimizu, Yasunori Minami, Yoshiaki Nakao, Ken-ichiro Ohya, Hidey ...2013 Volume 42 Issue 1 Pages 45-47
Published: January 05, 2013
Released on J-STAGE: December 22, 2012
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Supplementary materialCross-coupling reaction of dibromoarenes with HOMSi reagents (organo[2-(hydroxymethyl)phenyl]dimethylsilanes), or alternatively bromoarenes with arylene-bisHOMSi reagents, proceeded smoothly in the presence of a Pd catalyst and a weak base, and ter- or quaterarenes are produced in excellent yields. The present reaction was successfully applied to polyarylene synthesis using 4,7-dibromobenzothiadiazole or a 2,7-dibromofluorene derivative along with a 2,7-fluorenylene-bisHOMSi reagent.View full abstract -
Mi Yeon Lee, So Yeon Kim, Hyun Gu Kim, Insik In2013 Volume 42 Issue 1 Pages 48-49
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL RESTRICTED ACCESSLuminol-functionalized chemically reduced graphene oxide (RGO) was successfully formulated through simple noncovalent interation between luminol and RGO. Stability of RGO/luminol assembly and FT-IR study support that luminol molecules are strongly anchoring on RGO surface through π–π interaciton. Raman, AFM, and SEM studies confirm that the chemical reduction to RGO is successful and the exfoliation into individual RGO sheets is effective through this noncovalent approach using luminol. Interestingly, the chemiluminescence (CL) of luminol was completely quenched in RGO/luminol assembly, confirming that RGO platform is acceptable for not only fluorescence resonance energy transfer (FRET) but also chemiluminescence resonance energy transfer (CRET) in this study.View full abstract
Editor’s Choice
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Suguru Ohori, Kouko Fujisawa, Mika Kawai, Tetsu Mitsumata2013 Volume 42 Issue 1 Pages 50-51
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL OPEN ACCESSBimodal magnetic hydrogels consisting of magnetic and nonmagnetic particles were synthesized, and the magnetic response to the dynamic modulus of the gels was investigated. The change in the storage modulus for magnetic gels containing only magnetic particles exhibited 0.9 MPa by applying a magnetic field of 500 mT. The change in the storage modulus kept a high value although the magnetic particles were replaced with nonmagnetic particles by 34%. It can be considered that the magnetic interaction extends to the length of 4 to 6 microns via 2 or 3 nonmagnetic particles.View full abstract -
Kaori Sekine, Yoji Doi, Azusa Takai, Yusuke Yamauchi, Kazuyuki Kuroda2013 Volume 42 Issue 1 Pages 52-54
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL OPEN ACCESS
Supplementary materialMesoporous Pt films with controllably large-sized mesopores were prepared by using a diblock copolymer (polystyrene-b-poly(ethylene oxide), PS-b-PEO) and an organic expander (polystyrene homopolymer, h-PS). With the increase in the molecular weight of PS-b-PEO, the mesopore size gradually increased. All films possess spherical cage-type mesopores irrespectively of both the molecular weight of PS-b-PEO and the use of the expander.View full abstract -
Kohei Kusada, Hirokazu Kobayashi, Ryuichi Ikeda, Hitoshi Morita, Hiros ...2013 Volume 42 Issue 1 Pages 55-56
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL OPEN ACCESS
Supplementary materialWe first report the hydrogen storage properties of Rh nanoparticles having a diameter over 10 nm and the change in the temperature dependences of hydrogen storage based on particle sizes of Rh nanoparticles. Hydrogen storage was investigated by hydrogen pressure–composition isotherm and solid-state 2H NMR measurements. We demonstrate that Rh nanoparticles with dimensions of ca. 10 nm absorb hydrogen similar to smaller Rh nanoparticles; however, the enthalpy of hydrogen storage in Rh nanoparticles is changed from exothermic to endothermic with increasing particle size, with a critical size between 7.1 and 10.5 nm. The thermodynamics of hydrogen storage in Rh can be tuned by controlling the particle size.View full abstract
Letter
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Mariko Ando, Itaru Oikawa, Shinobu Ohki, Masataka Tansho, Tadashi Shim ...2013 Volume 42 Issue 1 Pages 57-59
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL RESTRICTED ACCESSThe local structure around the oxide ions in LnO1.5–CeO2 (Ln = La, Nd) was studied by using 17O NMR spectroscopy. Each spectrum of LnO1.5–CeO2 showed a broad peak due to a distribution of oxygen tetrahedra. From the peak separation, the relative numbers of oxygen tetrahedra, O[Ce]4, O[Ce]3[Ln], and O[Ce]2[Ln]2, were determined quantitatively. In the La2O3–CeO2 system, the amounts of O[Ce]4, O[Ce]3[Ln], and O[Ce]2[Ln]2 deviated from the calculated value for over 20 mol % La-doped ceria (LDC). The distribution of oxygen tetrahedra for LaO1.5–CeO2 differed from those in LnO1.5–CeO2 (Ln = Nd, Y). These results suggest that the stability of the oxygen tetrahedra changes with the size of the doped ions.View full abstract -
Masaaki Haneda, Hirotaka Sawada, Naoto Kamiuchi, Masakuni Ozawa2013 Volume 42 Issue 1 Pages 60-62
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL RESTRICTED ACCESSThe catalytic activity of Rh supported on Y-stabilized ZrO2 for NO–CO–C3H6–O2 reactions under stoichiometric conditions was improved by the addition of 5 mol % CeO2, whereas an excess amount of CeO2 of more than 10 mol % caused a decrease in the NO reduction activity. The improvement was ascribed to the formation of easily reducible Rh species through interaction with a Ce–Zr solid solution.View full abstract -
Rong Lu, Wei Wang, Shuwei Yuan, Anchi Yu2013 Volume 42 Issue 1 Pages 63-65
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
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Supplementary materialThe femtosecond optical heterodyne-detected Raman-induced Kerr-effect spectroscopy (OHD-RIKES) time profiles of [Bmim][PF6], [Bmim][BF4], and [Bmim]I present similar damping oscillations, indicating that their femtosecond OHD-RIKES signals mainly arise from [Bmim]+ cations. Both the femtosecond OHD-RIKES fast Fourier-transform spectra and the Raman spectra of [Bmim][PF6], [Bmim][BF4], and [Bmim]I reveal that the interactions between two [Bmim]+ cations in [Bmim]I are stronger than those in [Bmim][PF6] and [Bmim][BF4].View full abstract -
Tae Yun Ko, So Yeon Kim, Hyun Gu Kim, Gi-Seong Moon, Insik In2013 Volume 42 Issue 1 Pages 66-67
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
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Supplementary materialNoncovalent functionalization of antibacterial chitosan on chemically reduced graphene oxide (RGO) provides both dispersion stability and antibacterial activity for RGO, which is an insoluble and nonbioactive carbon nanomaterial. In situ chemical reduction of graphene oxide (GO) in the presence of chitosan under acidic conditions produces a stable dispersion of RGO/chitosan assemblies. The prepared RGO/chitosan assemblies show enhanced antibacterial activity for Escherichia coli JM109 compared with GO, suggesting that noncovalent chemistry can minimize any detrimental effects on the bioactivity, which is one of the critical features for biofunctionalization of carbon nanomaterials such as graphene.View full abstract
Editor’s Choice
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Hirotaka Kojima, Takehiko Mori2013 Volume 42 Issue 1 Pages 68-70
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL OPEN ACCESS
Supplementary materialThe title organic molecules, recently used as building blocks of ambipolar π-conjugated polymers, are investigated by molecular orbital calculations. The tendency that the transfer integral and the reorganization energy increase at the same time helps the accomplishment of balanced hole and electron mobilities.View full abstract
Letter
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Shingo Hadano, Hiroshige Handa, Keiji Nagai, Tomokazu Iyoda, JingZe Li ...2013 Volume 42 Issue 1 Pages 71-73
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
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Supplementary materialA hexagonally arranged gold nanoparticle array with a particle size of 29 nm and gap of 23 nm was fabricated on a silicon wafer substrate through the block-copolymer templating method. Its molecular sensing ability was examined on the basis of surface-enhanced Raman scattering (SERS). With 4-sulfanylpyridine (4-Spy) used as a target molecule, the SERS enhancement factor (EF) for this array was 7.0 × 104. A linear relationship between the SERS signal and the amount of 4-Spy was obtained, with a dynamic range of four orders of magnitude. The highly reproducible SERS sensing originates from the well-ordered gold nanoparticle arrangement over the whole substrate.View full abstract -
Hong Chu, Hiroharu Ajiro, Yoshikazu Takahashi, Mingqing Chen, Mitsuru ...2013 Volume 42 Issue 1 Pages 74-76
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
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Supplementary materialA poly(trimethylene carbonate) derivative with a methoxyethoxyl group, poly[5-(2-methoxyethyoxymethyl)-5-methyl-1,3-dioxan-2-one] (poly(TMCM-MOE1OM)), was used as a block copolymer component with polylactide. The hydrophilic properties of the poly(TMCM-MOE1OM) segment resulted in nanoparticles with acetonitrile/water through a self-organized precipitation process. Wide applications of the obtained nanoparticles are expected owing to the biodegradability of both the interior and exterior parts, which are composed of different polymer backbones.View full abstract -
Hikaru Sano, Hikari Sakaebe, Hajime Matsumoto2013 Volume 42 Issue 1 Pages 77-79
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL OPEN ACCESSThe morphology of electrodeposited lithium in room-temperature ionic liquids (RTILs) was observed by in situ optical microscopy. The dendrite suppression effect was partly confirmed for a PP13[FSA]-based electrolyte containing vinylene carbonate (VC). The factors for dendrite suppression are discussed; stability under cathodic conditions such as ELi/Li + and viscosity of the base electrolyte are considered to be the relevant factors.View full abstract -
Shimon Osada, Aoi Iribe, Kazuyuki Kuroda2013 Volume 42 Issue 1 Pages 80-82
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
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Supplementary materialLayered octosilicate was exfoliated by stirring didecyldimethylammonium-exchanged silicate in pentane with ultrasonication. The silicate framework was retained at least partly even after the exfoliation. Loosely arranged decyl groups in the interlayers probably induce the exfoliation. This exfoliation method should be applicable to other layered alkali silicates.View full abstract -
Yuanyuan Zhou, Qian Liu, Zhihua Zhao, Wanqiong Wang, Lige Zheng, Zhong ...2013 Volume 42 Issue 1 Pages 83-85
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
JOURNAL RESTRICTED ACCESSOn the basis of the hypothesis that phosphate groups introduced on collagen can induce the mineralization in natural hard tissue, first, type I collagen (extracted from bovine tendon) was phosphorylated with sodium trimetaphosphate (STMP). The subsequent growth of hydroxyapatite (HAP) on the phosphorylated collagen nanofibers was achieved through a precipitation reaction. The FTIR results indicated that the phosphate groups were incorporated onto the collagen surface through treatment with STMP. During the mineralization process, the rod-like crystals converged into layers of a flaky structure formed on the surface of the phosphorylated collagen, while plate-like minerals were obtained on the pure collagen, as indicated by the SEM and XRD findings. The bending strength of composites isopressed at 180 MPa also displayed a significant increase. The test results demonstrated that phosphate groups had indeed been introduced into the collagen molecules and gave rise to the superior mechanical behavior of the composite materials.View full abstract -
Tomokazu Masuda, Takeshi Sasagase, Akiko N. Ozaki, Masayasu Kuwahara, ...2013 Volume 42 Issue 1 Pages 86-88
Published: January 05, 2013
Released on J-STAGE: December 29, 2012
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Supplementary materialIn this study, phenanthroline–polyamine conjugates have been synthesized. The conjugates bind to DNA and hydrolyze it in the absence of any metal and reducing agent under physiological conditions.View full abstract -
Hiromi Togashi, Junko Yano, Vittal K. Yachandra, Takamitsu Kohzuma2013 Volume 42 Issue 1 Pages 89-90
Published: January 05, 2013
Released on J-STAGE: January 05, 2013
JOURNAL RESTRICTED ACCESSX-ray absorption spectroscopy (XAS) of a plastocyanin from a fern, Dryopteris crassirhizoma (DPc) was studied. The XAS of reduced CuIDPc demonstrated the retention of the four coordinated structure at pH 5.0. The EXAFS analyses of the reduced DPc demonstrated that the Cu-axial SMet95 ligand distance is much shorter than that in the oxidized form. This is the first report for the XAS and EXAFS of an unusual fern plastocyanin.View full abstract -
Novel Soft–Hard Donor Ligand, NTAamide, for Mutual Separation of Trivalent Actinoids and LanthanoidsYuji Sasaki, Yasuhiro Tsubata, Yoshihiro Kitatsuji, Yasuji Morita2013 Volume 42 Issue 1 Pages 91-92
Published: January 05, 2013
Released on J-STAGE: January 05, 2013
JOURNAL RESTRICTED ACCESSNew reagent, N,N,N′,N′,N′′,N′′-hexaoctylnitrilotriacetamide (NTAamide(C8)), was synthesized and examined for actinoid and lanthanoid extractions. NTAamide(C8) has one N atom and three carbonyl oxygen atoms in the central frame, and may show hybrid bonds between hard O and soft N donors. It was found that NTAamide can extract Am(III) and Cm(III) from diluted HNO3 with small D(Ln). This result suggests that the N-donor makes stronger complexes with Am(III) and Cm(III) than Ln(III) at low HNO3.View full abstract
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