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Research at OU


28  Griesbeck, A. G.; Abe, M.; Bondock, S.
(Graduate School of Engineering)
Selectivity Control in Electron Spin Inversion Processes: Regio- and Stereochemistry of Paternò-Büchi Photocycloadditions as a Powerful Tool for Mapping Intersystem Crossing Processes
Accounts of Chemical Research, 37, 919-928 (2004)

29 Hasobe, T.; Imahori, H.; Kamat, P. V.; Ahn, T. K.; Kim, S. K.; Kim, D.; Fujimoto, A.; Hirakawa, T.; Fukuzumi, S.
(Graduate School of Engineering)
Photovoltaic Cells Using Composite Nanoclusters of Porphyrins and Fullerenes with Gold Nanoparticles
Journal of the American Chemical Society, 127, 1216-1228 (2005)

30 Hasunuma, T.; Kuwabata, S.; Fukusaki, E.; Kobayashi, A.
(Graduate School of Engineering)
Real-Time Quantification of Methanol in Plants Using a Hybrid Alcohol Oxidase-Peroxidase Biosensor
Analytical Chemistry, 76, 1500-1506 (2004).

An amperometric biosensor immobilizing two enzymes and an electron mediator in an identical plane has been fabricated by the self-assembly technique. A self-assembled monolayer of alkylthiol on an Au electrode attached covalently two enzymes (Hansenula sp. alcohol oxidase and horseradish peroxidase) and an electron mediator, producing a two-dimensional reaction matrix. We successfully quantified methanol in low-purity tobacco (Nicotiana tabacum) plant extracts with the biosensor, which showed sensitivity comparable to that of gas chromatography/mass spectrometry.

31 Hayashi, H.; Ogo, S.; Fukuzumi S.
(Graduate School of Engineering)
Aqueous Hydrogenation of Carbon Dioxide Catalysed by Water-Soluble Ruthenium Aqua Complexes under Acidic Conditions
Chemical Communications, 2714-2715 (2004)

The hydrogenation of carbon dioxide is an interesting approach to the utilization of carbon dioxide ecologically and economically as a C1 source. In the past, hydrogenation of bicarbonate under basic conditions were developed, however, the base used had to be removed at the end of the reaction by neutralization. This paper described the synthesis and catalytic performance of ruthenium complex, which proved to be an efficient catalyst for the hydrogenation of carbon dioxide under acidic conditions without base.

32 Hirao, T.; Ogawa, A.; Asahara, M.; Muguruma, Y.; Sakurai, H.
(Graduate School of Engineering)
dl-Selective Pinacol-type Coupling Using Zinc, Chlorosilane, and Catalytic Amounts of Cp2VCl2 (dl-1,2-Dicylohexylethanediol)
Organic Synthesis, 81, 26-32 (2005)

The low-valent vanadium-catalyzed pinacol coupling reactions are developed by constructing a multi-component redox system in combination with a co-reductant and an additive. The high diastereoselective reductive dimerization of aldehydes proceeds via one-electron reduction in the presence of a vanadium catalyst, a chlorosilane, and zinc to give the vic-diols. This reaction provides a versatile method for the catalytic stereoselective formation of vicinally functinalized carbon-carbon bonds. This method is applied to the coupling of aldimines to give the diamines.

33 Hirooka, M.; Tanaka, H.; Li, R-W.; Kawai, T.
(Institute of Scientific and Industrial Research)
Nanoscale Modification of Electrical and Magnetic Properties of Fe3O4 Thin Film by Atomic Force Microscopy Lithography
Applied Physics Letters, 85, 1811-1813 (2004)

This paper reports on the nano-patterning of an epitaxial Fe3O4 ultra-thin film with room-temperature ferrimagnetism using atomic force microscopy (AFM) lithography. Nano-patterns were constructed on Fe3O4 thin film by applying an electric field between an AFM tip and the film surface. The minimum width in the resulting nano-pattern is 48 nm. Usually, nanolithography for complex oxides is quite difficult, but AFM lithography technique could overcome this difficulty, leading to construction of superior oxide magnetic random access memory devices.

34 Hosokawa, Y.; Masuhara, H
(Graduate School of Engineering)
Nondestructive Isolation of Single Cultured Animal Cells by Femtosecond Laser-Induced Shockwave
Applied Physics A, 79, 795-798 (2004).

When an intense femtosecond laser is focused in a culture medium under a microscope, a shockwave is locally generated at the focal point. In this paper, the shockwave was applied to detach cultured animal cells individually from a culture plate coated with extracellular matrix component. Most of cells in our body, except for blood cells, adhere to one another or to the surrounding extracelluar matrix, grew, and function, so that this technique will be a potential tool to manipulate single animal cells.

35 Ikeda, T.; Aoki, T.; Nakajima, H.
(Institute of Scientific and Industrial Research)
Fabrication of Lotus-Type Porous Stainless Steel by Continuous Zone Melting Technique and Mechanical Property
Metallurgical and Materials Transactions A, 36A, 77-86 (2005)

36 Imada, Y.; Iida, H.; Murahashi, S.-I.; Naota, T.
(Graduate School of Engineering Science)
An Aerobic, Organocatalytic, and Chemoselective Method for Baeyer-Villiger Oxidation
Angewandte Chemie International Edition, 44, 1704-1706 (2005)

Aerobic Baeyer-Villiger oxidations can be performed using the flavin catalyst derived from riboflavin (Vitamin B2) in the presence of zinc dust as an electron source. The Baeyer-Villiger oxidations exhibit high chemoselectivities in the presence of other reactive functionalities such as alcohols, olefins, and sulfides, which would undergo electrophilic oxidation under conventional conditions.

37 Imanaka, N.; Masui, T.; Chiga, T.
(Graduate School of Engineering)
Synthesis and Luminescent Properties of Fine Particles of (Y1-xLax)2O3:Eu3+ Solid Solutions
Electrochemical and Solid-State Letters, 7, D7-D9 (2004)

Fine particles of red emission phosphors, (Y1-xLax)2O3:Eu3+, have been synthesized, and their luminescent properties were compared with that of a commercial Y2O3:Eu3+. The limiting value of Eu3+ content where concentration quenching starts was enhanced by La3+ doping into the host Y2O3 lattice. On the contrary to the general tendency that emission intensity decreases with particle size reduction, the emission intensity of the (Y1-xLax)2O3:Eu3+ fine particles (0.57 µm) was equivalent to that of the larger commercial Y2O3:Eu3+ (3.1 µm).

38 Inoue, K.; Yokomori, R.; Yamamoto, T.; Matsushita, M.; Kusumoto, S.
(Graduate School of Information Science and Technology)
Ranking Significance of Software Components Based on Use Relations
IEEE Transactions on Software Engineering, 31, 213-225 (2005)

39 Ichimura, T.*1; Hayazawa, N.*1; Hashimoto, M.*2; Inouye, Y.*3; Kawata, S.*1
*1 (Graduate School of Engineering) *2 (Graduate School of Engineering Science) *3 (Graduate School of Frontier Biosciences)
Tip-Enhanced Coherent Anti-Stokes Raman Scattering for Vibrational Nanoimaging
Physical Review Letters, 92, 220801/1-4 (2004)

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