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2008, Vol. 37 No. 1-12
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| Dec. 2008, Vol.37 No.12
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Web Release Date:
November 1, 2008
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| 1184 |
Functionalized Antibodies as Biosensing Materials and Catalysts |
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Hiroyasu Yamaguchi and Akira Harada |
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Monoclonal antibodies have been prepared against water-soluble porphyrins, viologen derivatives, and transition-metal complexes, respectively. These monoclonal antibodies were utilized to devise biosensing and catalytic systems. |
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| Nov. 2008, Vol.37 No.11
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Web Release Date:
September 27, 2008
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| 1102 |
Formation of C–C Bonds via Ruthenium-catalyzed Transfer Hydrogenation: Carbonyl Addition from the Alcohol or Aldehyde Oxidation Level |
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Fumitoshi Shibahara and Michael J. Krische |
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Under the conditions of ruthenium-catalyzed transfer hydrogenation employing isopropyl alcohol as terminal reductant, π-unsaturated compounds (1,3-dienes, allenes, 1,3-enynes, and alkynes) reductively couple to aldehydes to furnish products of carbonyl addition. In the absence of isopropyl alcohol, π-unsaturated compounds couple directly from the alcohol oxidation level to form identical products of carbonyl addition. Such “alcohol-unsaturate C–C couplings” enable carbonyl allylation, propargylation and vinylation from the alcohol oxidation level in the absence of stoichiometric organometallic reagents or metallic reductants. Thus, direct catalytic C–H functionalization of alcohols at the carbinol carbon is achieved. |
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| Oct. 2008, Vol.37 No.10
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Web Release Date:
September 20, 2008
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| 1012 |
Defects and Conductivity in Ceria-based Oxides |
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J. A. Kilner |
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This short review looks at some recent theoretical and experimental evidence which has thrown new light onto the complex interplay between the defects that form on the cation and anion sublattice in doped CeO2. These defect interactions give rise to the type of behavior shown in the figure, and recent insight into their nature has indicated ways in which the ionic conductivity might be optimized by novel substitution schemes. |
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| Sep. 2008, Vol.37 No.9
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Web Release Date:
July 26, 2008
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| 896 |
Bent Donor Molecules and Their Charge-transfer Salts with Magnetic FeIII and CuII Ions |
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Toyonari Sugimoto |
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New donor molecules with a bent molecular skeleton, tetrathiafulvalenoquinone(-thioquinone)-1,3-dithiole(-disele-nole)methides are synthesized, which are used for the preparation of charge-transfer (CT) salts with magnetic FeIII and CuII ions. The CT salts with FeX4− (X = Cl and Br) ions have such crystal structures that the donor molecules and the FeX4− ions form layers, respectively, and are alternately stacked to each other. On the other hand, for the CT salts with CuII ions the donor molecules or both the donor molecules and the CuII ions are stacked to each other to form one-dimensional channels, where the other CuI and/or CuII ions are included inside. Depending on the stacking structures of the donor molecules electrical conducting properties are metallic, semiconducting or insulating. The d spins of the FeIII and CuII ions interact by themselves and also with the conducting π electrons of the donor molecules, bringing about ferromagnetic, weak ferromagnetic or antiferromagnetic orderings. |
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| Aug. 2008, Vol.37 No.8
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Web Release Date:
June 28, 2008
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| 808 |
Metal Ion-coupled Electron-transfer Reduction of Dioxygen |
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Shunichi Fukuzumi |
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Metal ion-coupled and proton-coupled electron-transfer reactions of dioxygen is described for one-electron, two-electron, and four-electron reduction of dioxygen by one-electron reductants such as ferrocene derivatives as well as by two-electron reductants such as NADH analogs. The catalytic mechanism of the four-electron reduction of dioxygen with cofacial dicobalt porphyrins has been clarified based on the detailed kinetic study and the detection of the intermediate. |
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| Jul. 2008, Vol.37 No.7
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Web Release Date:
May 31, 2008
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| 672 |
Structural and Functional Model Systems for Analysis of the Active Center of Nitrile Hydratase |
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Takuma Yano, Tomohiro Ozawa, and Hideki Masuda |
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We focused a unique active site structure of nitrile hydratase (NHase), where the central metal ion (CoIII or FeIII) is surrounded with two amide nitrogens in peptide backbone, one cysteine sulfur and two oxidized cysteine sulfurs (Cys–SO and Cys–SO2) as the donor set. In this review, the biological implication of the unique structure has been discussed in the relation with the nitrile hydration mechanism by using model complexes. |
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| Jun. 2008, Vol.37 No.6
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Web Release Date:
May 3, 2008
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| 564 |
PEG-b-polyamine Stabilized Bionanoparticles for Nanodiagnostics and Nanotherapy |
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Yukio Nagasaki |
| [Full Text PDF(J-STAGE)] [Supporting Information] |
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Poly(ethylene glycol)-b-poly(2-(N,N-dimethylamino)ethyl methacrylate) block copolymers possessing a reactive group at the PEG chain end (R-PEG-b-PAMA) was synthesized by two different polymerization techniques. Using R-PEG-b-PAMA block copolymer thus obtained, gold nanoparticles (GNPs) were prepared. The PEG-b-PAMA worked as not only reducing agent of aurate ions but also coordination on the obtained nanoparticle surface. The obtained GNP had controlled sizes and narrow size distributions. It is also showed extremely high dispersion stability due to the PEG tethering chains on the surface. The same strategy could be applicable to other nanoparticles such as semiconductor quantum dot and inorganic porous nanoparticles. Using PEGylated GNPs thus prepared, several applications such as molecular recognitions, siRNA release and enzyme immobilizations were carried out. The functionalities of these materials are described in this review. |
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| May. 2008, Vol.37 No.5
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Web Release Date:
March 29, 2008
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| 484 |
Light-directed Dynamic Structure Formation and Alignment in Photoresponsive Thin Films |
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Takahiro Seki and Shusaku Nagano |
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Light provides practical and versatile tools for structure formation and its tuning of soft materials. This article briefly overviews recent developments of photoalignment and phototuning of nanostructured materials focusing onto the 2D material systems. Two topics are involved; i) phototuning and alignment of microphase-separated nanostructures in block copolymers containing a photoisomerizable unit and ii) photoalignment of organic/silica nanohybrids prepared on a polymer film with photocrosslinkable unit. |
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| Apr. 2008, Vol.37 No.4
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Web Release Date:
March 15, 2008
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| 382 |
One-dimensional Halogen-bridged NiIII Compounds: Chemistry and Physics in Strongly Correlated Electron Systems |
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Shinya Takaishi and Masahiro Yamashita |
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| Mar. 2008, Vol.37 No.3
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Web Release Date:
February 23, 2008
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| 230 |
Fabrication of Amperometric Biosensing Systems Focusing on Attachment of High Substrate Selectivity |
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Susumu Kuwabata |
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The techniques for attaching high substrate selectivity to the amperometric biosensing systems are summarized with classification of membrane techniques, electron mediation techniques, electrodes, and electrochemical techniques. |
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| Feb. 2008, Vol.37 No.2
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Web Release Date:
December 22, 2008
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| 128 |
Making Stable Radicals of Heavy Elements of Groups 14 and 13: The Might of Silyl Substitution |
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Vladimir Ya. Lee, Masaaki Nakamoto, and Akira Sekiguchi |
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Recent developments in the field of the stable free radicals centered on the heavy elements of groups 14 and 13, both neutral and charged, are covered in the present review with a particular focus on the thermodynamic and kinetic stabilization of radical species with the bulky electropositive silyl substituents. |
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| Jan. 2008, Vol.37 No.1
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Web Release Date:
December 8, 2008
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| 2 |
Development of Chiral Bicyclic Triazolium Salt Organic Catalysts: The Importance of the N-Aryl Substituent |
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Tomislav Rovis |
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The development of a family of chiral bicyclic triazolium salts is described. Treatment of these salts with base provides a nucleophilic carbene which may be used as an organic catalyst for asymmetric acyl anion chemistry including the benzoin and Stetter reactions, and some recently developed redox chemistry. Throughout the development of these reactions, the nature of the N-aryl substituent on the triazole ring has proven to have a profound effect on both reactivity and selectivity. These observations have also paralleled those made by others using our family of catalysts. |
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