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2004, Vol. 33 No. 4-12
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| Dec. 2004, Vol.33 No.12
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Web Release Date:
October 30, 2004
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| 1534
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Strategies for the Development of Visible-light-driven Photocatalysts for Water Splitting
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Akihiko Kudo, Hideki Kato, and Issei Tsuji
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Photocatalysts for water splitting developed by the present authors are reviewed. A NiO (0.2 wt %)/NaTaO3:La (2%) photocatalyst with a 4.1-eV band gap showed high activity for water splitting into H2 and O2 with an apparent quantum yield of 56% at 270 nm. Many visible-light-driven photocatalysts have also been developed through band engineering by doping of metal cations, forming new valence bands with Bi6s, Sn5s, and Ag4d orbitals, and by making solid solutions between ZnS with wide band gap and narrow band gap semiconductors. Overall water splitting under visible light irradiation has been achieved by construction of a Z-scheme photocatalysis system employing the visible-light-driven photocatalysts for H2 and O2 evolution, and the Fe3+/ Fe2+ redox couple as an electron relay.
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| Nov. 2004, Vol.33 No.11
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Web Release Date:
September 29, 2004
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| 1404
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Multiplex Sum-frequency Spectroscopy with Electronic Resonance Enhancement
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Taka-aki Ishibashi and Hiroshi Onishi
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Multiplex detection of broad bandwidth light brings remarkable improvements in the experimental design of sum-frequency spectroscopy. Highly sensitive, interface-specific observations of molecular vibrations are demonstrated with examples of n-alkyl chains covalently anchored on Si(111) and an organic compound chemisorbed on TiO2(110).
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| Oct. 2004, Vol.33 No.10
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Web Release Date:
August 28, 2004
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| 1226
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Ligand Influences in Heme–Copper O2-Chemistry as Synthetic Models for Cytochrome c Oxidase
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Kenneth D. Karlin and Eunsuk Kim
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Recent advances in synthetic modeling of the cytochrome c oxidase heme–copper active site chemistry includes dioxygen reactivity studies which lead discrete heme–peroxo–copper assemblies. The coordination and spectroscopic properties (e.g., resonance Raman O–O stretching vibration) are strongly influenced by the copper ligand environment (e.g., ligand denticity). |
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| Sep. 2004, Vol.33 No.9
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Web Release Date:
August 14, 2004
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| 1072
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Task-Specific Ionic Liquids
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James H. Davis, Jr.
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Task-specific ionic liquids are a unique subclass of ionic liquids which possess a potential spectrum of utility extending far beyond that likely for more conventional IL. By virtue of their covalently tethered functional groups, these unique salts can act not only as solvents but as catalysts and reagents in an array of synthetic, separations, and electrochemical applications.
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| Aug. 2004, Vol.33 No.8
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Web Release Date:
July 5, 2004
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| 946
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A Genomic Frontier in Bioinorganic Chemistry
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Ivano Bertini and Antonio Rosato
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Genome sequencing projects are providing researchers with an unprecedented wealth of information. This information has the potential to make a deep impact on how experiments are planned and the physiology of living organisms is investigated. One field where the availability of genome sequence has not been thoroughly exploited yet is bioinorganic chemistry. The latter discipline deals with the interaction of biological molecules with inorganic compounds. In this review we give an overview of some aspects of the interplay of genome sequencing projects and bioinorganic chemistry. |
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| Jul. 2004, Vol.33 No.7
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Web Release Date:
May 31, 2004
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| 780
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Theoretical Calculations on Electronic Structure and Catalytic Reaction of Organo-f-element Complexes
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Yi Luo, Parasuraman Selvam, Michihisa Koyama, Momoji Kubo, and Akira Miyamoto
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The use of lanthanide complexes as catalysts in organic synthesis is currently of intense interest. In particular, organolanthanide complexes are of rapidly growing importance, and hence the understanding of the binding behavior of f orbital as well as the ionic/covalent characteristics of lanthanocene-based complexes is of significance with respect to their reactivity and their role as catalyst in organic synthesis. The purpose of this review is to give a survey of recent progress in theoretical studies on organo-f-element complexes and to highlight successful applications of density functional and quantum chemical molecular dynamics methods.
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| Jun. 2004, Vol.33 No.6
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Web Release Date:
April 26, 2004
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| 640
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Tridentate Aryloxide Ligands: New Supporting Ligands in Coordination Chemistry of Early Transition Metals
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Tsukasa Matsuo and Hiroyuki Kawaguchi
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The use of covalently linked multidentate ligands is a very useful concept in coordination and organometallic chemistry. This article gives an account of the syntheses and structures of metal complexes supported by linear-linked aryloxide trimer ligands, in which aryloxide units are connected at ortho positions throughmethylene linkers.
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| May 2004, Vol.33 No.5
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Web Release Date:
April 24, 2004
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| 482
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Sulfoximines: Synthesis and Catalytic Applications
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Hiroaki Okamura and Carsten Bolm
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Chiral sulfoximines have a stereogenic center at the sulfur atom and their use in asymmetric synthesis is well established. Recently, sulfoximines have been recognized as an interesting new class of chiral ligands, which can be applied in various asymmetric metal catalyses. This review summarizes the latest progress in synthetic methods towards sulfoximines and the application of chiral derivatives in catalytic asymmetric reactions.
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| Apr. 2004, Vol.33 No.4
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Web Release Date:
March 20, 2004
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| 362
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Palladium Catalyzed Aerobic Dehydrogenation: From Alcohols to Indoles and Asymmetric Catalysis
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Brian M. Stoltz
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Catalytic aerobic dehydrogenation of organic substrates is going through a Renaissance. Recent advances in this area have led to the discovery of palladium-catalyzed alcohol dehydrogenations and oxidative hetero- and carbocyclizations. The development of asymmetric catalytic dehydrogenations is the latest advance in a long line of catalytic asymmetric oxidation reactions. |
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