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Unstructured Information Management Projects at IBM Tokyo Research Laboratory
Takeda, Koichi,Watanabe, Hideo,Uramoto, Naohiko,Nomiyama, Hiroshi,Matsuzawa, Hirofumi,Nasukawa, Tetsuya,Nagano, Tohru,Murakami, Akiko,Takeuchi, Hironori,Kanayama, Hiroshi,Kobayashi, Mei,Aono, Masaki,I 한국정보처리학회 2004 정보처리학회지 Vol.11 No.2
Azabuckybowl-Based Molecular Tweezers as C<sub>60</sub> and C<sub>70</sub> Receptors
Takeda, Motoki,Hiroto, Satoru,Yokoi, Hiroki,Lee, Sangsu,Kim, Dongho,Shinokubo, Hiroshi American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.20
<P>We designed and synthesized molecular tweezers consisting of nitrogen-embedded buckybowl subunits. The judicious choice of the covalent linkers modulated their binding strength with C<SUB>60</SUB> or C<SUB>70</SUB> in solution. Titration studies by optical and <SUP>1</SUP>H NMR analyses revealed a 1:1 composition of the resulting complexes. X-ray diffraction analysis elucidated their solid-state structures, in which two azabuckybowl units surround one fullerene molecule. The large association constants stabilize the complexes toward redox reactions and the purification process on silica-gel column chromatography. The linker enabled tuning of the cavity size for binding of fullerenes, achieving complementary fullerene hosts for C<SUB>60</SUB> and C<SUB>70</SUB>: the carbazole-bridged dimer preferentially associates with C<SUB>70</SUB> over C<SUB>60</SUB>, while the phenanthrene-bridged dimer interacts with C<SUB>60</SUB> more strongly than C<SUB>70</SUB>. Electrochemical analysis in combination with density functional theory calculations indicated the existence of intermolecular charge-transfer interactions between the buckybowl units and the fullerenes. Nonlinear optical measurements showed that the two-photon absorption cross sections of the molecular tweezers are enhanced upon association with fullerenes.</P> [FIG OMISSION]</BR>
The photochemical reactions of iron species in rain and snow in Higashi-Hiroshima, Japan
Kim, Do Hoon,Takeda, Kazuhiko,Sakugawa, Hiroshi,Lee, Jin Sik The Korean Society of Analytical Science 2003 분석과학 Vol.16 No.6
This paper describes the concentrations of total dissolved iron (tFe) and $Fe^{2+}$ in rainwater and snow, the relationship of Fe species with other metals and ions in bulk rainwater, and the $Fe^{2+}$ generation mechanism in aqueous samples in rainwater of time series collection. Volume weight mean concentrations of tFe and $Fe^{2+}$ were 3.22 and $1.25{\mu}gL^{-1}$ in bulk rainwater, and 50.1 and $43.5{\mu}gL^{-1}$ in snow, respectively. $Fe^{2+}$ was significant fraction to the tFe, accounted for 3.25-93.4% of the tFe in rainwater and 87% in snow. We also investigated temporal variations of tFe, $Fe^{2+}$, other metals and ions in rainwater of time series collection during rain event. Although the concentration range of tFe was different from those of other species, a decreasing trend of tFe from the beginning of the rain event was similar with other species. However, though $Fe^{2+}$ did not show such a decreasing trend, $Fe^{2+}$/tFe was in good correlation with solar radiation. From the results of multiple linear regression analysis and thermodynamic calculations (Mineql+), $Fe^{2+}$ in our samples may be generated from photochemical reduction of $Fe^{3+}$ species (such as $Fe(OH)^{2+}$,$Fe(OH)^{2+}$ and Fe-oxalate) at daytime.
Yoshihiro Nonaka,Kenichiro Takeda,Hiroshi Nakane,Takao Maeda 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Simultaneous measuring system for permeability and resistivity of magnetic sheets is presented. In this system, the coil impedance is measured when a specimen is inserted between two coils. This system was applied to nickel sheets, iron-nickel alloys and a nickel thin film.