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Research at OU


26  Abura, T.; Ogo, S.; Watanabe, Y.; Fukuzumi, S.
(Graduate School of Engineering)
Isolation and Crystal Structure of a Water-Soluble Iridium Hydride: A Robust and Highly Active Catalyst for Acid-Catalyzed Transfer Hydrogenations of Carbonyl Compounds in Acidic Media
Journal of the American Chemical Society, 125, 4149-4154 (2003)

A water-soluble iridium hydride complex acts as a robust and highly active catalyst for acid-catalyzed transfer hydrogenations of carbonyl compounds in a pH range of 2 to 3. The structure of the water-soluble iridium hydride complex was unequivocally determined by X-ray analysis. The effect of pH on the rate of the transfer hydrogenation is rationalized by the pH-dependent formation of the water-soluble iridium hydride complex and activation process of the carbonyl compounds by protons.

27 Akai, S.; Naka, T.; Omura, S.; Tanimoto, K.; Imanishi, M.;
Takebe, Y.; Matsugi, M.; Kita, Y.(Graduate School of Pharmaceutical Sciences)
Lipase-Catalyzed Domino Kinetic Resolution/Intramolecular Diels-Alder Reaction: A One-Pot Preparation of Optically Active 7-Oxabicyclo[2.2.1]heptenes from Furfuryl Alcohols and β-Substituted Acrylic Acids
Chemistry - A European Journal, 8, 4255-4264 (2002)

As an environmentally benign protocol, lipases, a kind of hydrolytic enzymes, have extensively been employed for organic synthesis; however, their use was limited to just separation of racemic mixtures into each enantiomer. This paper presents the first usage of the lipases for the construction of carbon frameworks. The key was the use of suitably functionalized ethoxyvinyl esters for the lipase-catalyzed esterification. Thus, optically pure tricyclic compounds were synthesized, via consecutive three steps, from readily available racemic alcohols and achiral carboxylic acids.

28 Arakawa, S.*1; Murata, M.*1 (Graduate School of Economics) *2 (Cybermedia Center)
Lightpath Management of Logical Topology with Incremental Traffic Changes for Reliable IP over WDM Networks
Optical Networks Magazine, 3, 68-76, (2002)

We propose a new approach, called incremental capacity dimensioning approach, to design a reliable IP over WDM network. Our approach consists of three steps: an initial phase, an incremental phase, and a re-adjustment phase, through which the logical topology can be adjusted according to the incrementally changing traffic demand. MRB (Minimum Reconfiguring for Backup lightpath) is proposed to assign a wavelength route in such a way that the number of backup lightpaths to be reconfigured is minimized.

29 Fukuzumi, S.; Inada, O.; Suenobu, T.(Graduate School of Engineering)
Direct Detection of Radical Cations of NADH Analogues
Journal of the American Chemical Society, 124, 14538-14539 (2002)

The radical cation of an NADH analog (BNAH: 1-benzyl-1,4-dihydronicotinamide) has been successfully detected as the transient absorption and ESR spectra in the thermal electron transfer from BNAH to Fe(bpy)33+ (bpy = 2,2’-bipyridine). The ESR spectra of the radical cations of BNAH and the dideuterated compound (BNAH-4,4’-d2) indicate that the observed radical cation is the keto form rather than the enol form in the tautomerization. The deprotonation rate and the kinetic isotope effects of the keto form of BNAH•+ were determined from the kinetic analysis of the electron transfer reactions.

30 Hagihara, K.; Nakano, T.; Umakoshi, Y. (Graduate School of Engineering)
Plastic Deformation Behaviour in Ni3Ti Single Crystals with D024 Structure
Acta Materialia, 51, 2623 - 2637 (2003)

31 Hayazawa, N.; Inouye, Y.*1; Sekkat, S.*2; Kawata, S.*3
*1 (Graduate School of Frontier Biosciences) *2 (Handai FRC) *3 (Graduate School of Engineering)
Near-field Raman Imaging of Organic Molecules by an Apertureless Metallic Probe Scanning Optical Microscope
Journal of Chemical Physics, 117, 1296-1301 (2002)


Hirai, T.*1; Orikoshi, T.*2; Komasawa, I.*3
*1(Research Center for Solar Energy Chemistry, and Graduate School of Engineering Science) *2(Graduate School of Engineering Science) *3(Graduate School of Engineering Science, and Research Center for Solar Energy Chemistry)
Preparation of Y2O3:Yb,Er Infrared-to-Visible Conversion Phosphor Fine Particles Using an Emulsion Liquid Membrane System
Chemistry of Materials, 14, 3576-3583 (2002)

33 Ichitsubo, T.; Tane, M.*1; Ogi, H.*1; Hirao, M.*1; Ikeda, T.*2;
Nakajima, H.*2
*1 (Graduate School of Engineering Science)
*2 (Institute of Scientific and Industrial Research)
Anisotropic Elastic Constants of Lotus-Type Porous Copper: Measurements and Micromechanical Modeling
Acta Materialia, 50, 4105-4115 (2002)

We studied the elastic constants of a lotus-type porous copper, regarding it as a composite material of hexagonal elastic symmetry with the c-axis along the longitudinal direction of the pores. We used the ultrasonic resonance methods to determine the full set of anisotropic elastic constants. Micromechanics model including the matrix’s elastic anisotropy can reproduce the measurements. Then, the present approach predicts the elastic properties of various types of porous metals.
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