-
Sukekatsu Nozaki
1997 Volume 26 Issue 1 Pages
1-2
Published: 1997
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The optimal amounts of HOBt, HOSu, and HONb for enhancement of peptide coupling mediated by EDC in aqueous media were found to be less then equimolar against the C-component or the carbodiimide. A combination of EDC and 0.1 equimolar amount of HOBt was shown to be an effective coupling reagent under aqueous conditions.
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Chang-Guo Zhan, Suehiro Iwata
1997 Volume 26 Issue 1 Pages
3-4
Published: 1997
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Ab initio GIAO magnetic shielding calculations have been carried out on the hexa-coordinate phosphorus intermediate and the corresponding reactant and product for the N→O migration reaction of dimethyloxyphosphoryl-threonine. The calculated results lead us to predict that the
31P NMR chemical shift of the hexa-coordinate phosphorus intermediate is −138 ppm, while the
31P chemical shifts of the corresponding reactant and product are 4.9 ppm and −6.6 ppm, respectively.
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Tokuji Ikeda, Kazuyoshi Takagi, Hirosuke Tatsumi, Kenji Kano
1997 Volume 26 Issue 1 Pages
5-6
Published: 1997
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A carbon electrode modified with immobilized whole cells of
Desulfovibrio vulgaris was found to be able to electrochemically drive the reaction: H
2↔2H
++2e
− very effectively in both forward and reverse directions by the use of methyl viologen and vitamin K
3 as a mediator, respectively. Similarly, the reduction of dioxygen was electrochemically driven by the use of
Thiobacillus ferrooxidans as a biocatalyst and hexacyanoferrate (II) as a mediator.
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Dejian Zhou, Geoffrey J. Ashwell, Chunhui Huang
1997 Volume 26 Issue 1 Pages
7-8
Published: 1997
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Strong second harmonic generation (SHG) from LB monolayers of a new ionically combined nonlinear optical bis-chromophore zinc complex, bis(E)-N-octadecyl-4-[2-(4-dibutylaminophenyl)ethenyl] pyridinium bis (2-thione-1,3-dithiol-4,5-dimercapto) zinc (
1), was observed even when the film was transferred at 5 mN/m. The second-order susceptibility (χ
(2)ZZZ) is evaluated to be about 140 pmV
−1, which is 2.8 times that of the corresponding dye iodide.
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Tushar K. Chakraborty, Khaja Azhar Hussain
1997 Volume 26 Issue 1 Pages
9-10
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Stereoselective synthesis of a peptidomimetic analog of the binding domain of rapamycin starting from
N,
N-dibenzyl-
R-alaninal is described.
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Robert Chênevert, Gabriel Courchesne
1997 Volume 26 Issue 1 Pages
11-12
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Acetylation of 2-[4-(benzyloxy)-2-nitrophenyl]propane-1,3-diol with vinyl acetate in the presence of porcine pancreatic lipase gave the (R)-mono-acetate (ee = 92%). The (S)-mono-acetate was obtained via acetylation of the diol followed by transesterification in ethanol in the presence of the same enzyme. Incorporation of these optically active mono-acetates into the established synthetic routes provided access to both enantiomers of the common pharmacophore of CC-1065/duocarmycin.
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Yusaku Takita, Gong-Liang Li, Rie Matsuzaki, Hironori Wakamatsu, Hiroy ...
1997 Volume 26 Issue 1 Pages
13-14
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CCl
2F
2 was decomposed to CO
2 at 350–450 °C in the presence of water vapor and O
2 over AlPO
4 calcined at 1000 °C. CCl
2F
2 conversion slightly decreased at initial 50 h and then took a steady value. AlPO
4 was not fluorinated during 1000 h reaction at 400 °C.
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Timo V. Ovaska, George H. Voynov, Nicole McNeil, Joel A. Hokkanen
1997 Volume 26 Issue 1 Pages
15-16
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An asymmetric synthetic route toward a new class of structural mimics of the sulphidoleukotrienes has been developed. The key steps in the overall synthetic sequence include Sharpless asymmetric epoxidation followed by stereo- and regioselective opening of the epoxide ring.
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Masato Kurihara, Ikuko Saito, Yoko Morinaga, Yoshihisa Matsuda
1997 Volume 26 Issue 1 Pages
17-18
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Reactions of oxoethoxomolybdenum(V)porphyrins and substituted phenols were investigated by UV-vis absorption spectra. Ligand substitution or reduction of the metal center proceeded depending on the steric repulsion between the substituents of the phenols and the porphyrin skeletons. Proton transfer from the phenols to the axial ligand of the molybdenumporphyrin initiated the reactions. Parallel outer sphere and inner electron transfer proceeded parallel in the reduction of the molybdenum center.
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Minoru Yamaji, Takuya Tanaka, Haruo Shizuka
1997 Volume 26 Issue 1 Pages
19-20
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The decay process of the triplet exciplexes formed between triplet naphthalene derivatives and benzophenone was found to be promoted by their charge transfer character since the rate constant of the nonradiative deactivation process increased with decreasing of the oxidation potentials of naphthalene derivatives.
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Takashi Toda, Masahiro Kuwana, Yoshitaka Ohhashi, Masaaki Yoshida
1997 Volume 26 Issue 1 Pages
21-22
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Reactions of 1-bromo-1-substituted-2-(9-fluorenylidene)ethenes with alkanethiolate ions gava spiro[1-alkylthiocyclopropene-3,9′-fluorenes]. The bromoallene derived from 2,3-diphenylindene also afforded the corresponding spirocyclopropene compound.
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Yuichi Kaneko, Tsuyoshi Kanke, Syun-ichi Kiyooka, Kiyoshi Isobe
1997 Volume 26 Issue 1 Pages
23-24
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A catalytic selective tail-to-tail dimerization of ethyl acrylate was achieved by using dinuclear rhodium complexes, [(RhCp
*)
2(
μ-CH
2)
2(CH
3CN)
2](BF
4)
2(Cp
*=C
5Me
5) (
1a) and [(RhCp
*)
2(
μ-CH
2)
2(CO)
2](BF
4)
2 (
2). The corresponding dimethyl complex, [(RhCp
*)
2(
μ-CH
2)
2(CH
3)
2] (
3), showed catalytic ability only in the presence of HBF
4·OEt
2.
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Katsuhiko Ariga, Mitsuhiko Onda, Yuri Lvov, Toyoki Kunitake
1997 Volume 26 Issue 1 Pages
25-26
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In the preparation of ultrathin films by alternate assembly, prior mixing with linear polyions facilitates stable adsorption of small-molecule dyes and direct assembly of globular proteins and micro-plates.
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Yoshikazu Makioka, Akira Saiki, Ken Takaki, Yuki Taniguchi, Tsugio Kit ...
1997 Volume 26 Issue 1 Pages
27-28
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Ytterbium-aromatic imine dianion complexes, easily prepared from ytterbium metal and aromatic imines, can act as effective catalysts for the isomerization of terminal alkynes to afford internal alkynes in good to high yields.
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Tomoharu Ama, Ken-ichi Okamoto, Toshiaki Yonemura, Hiroshi Kawaguchi, ...
1997 Volume 26 Issue 1 Pages
29-30
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The trinuclear cobalt(III) complex with the partial cubane Co
3O
4 core, [Co
3(dpa)
3(μ-OH)
3(μ
3-O)]
4+ (dpa: bis(2-pyridylmethyl)amine), was prepared and the structure was determined by the X-ray diffraction method. Though the partial cubane structure was slightly distorted by the N–H↔H–N repulsive interaction, this complex is stable at least 5 days in its neutral aqueous solution.
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Makoto Ohmae, Katsuyoshi Miyaji, Naoto Azuma, Kaoru Takeishi, Yoshio M ...
1997 Volume 26 Issue 1 Pages
31-32
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Effects of water vapor upon the partial oxidation of methane on silica-supported molybdenum oxide catalyst strongly depend upon the dispersion states of Mo ions, and highly dispersed Mo ions depress the production of CO
2 by an addition of water vapor into the feed gas.
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Seiji Kosemura, Shin-ichi Kojima, Shosuke Yamamura
1997 Volume 26 Issue 1 Pages
33-34
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Six new metabolites, citreopyrones A-C and D-F, have been isolated from the mycelium of a hybrid strain KO 0092 derived from
P. citreo-viride B. IFO 4692 and 6200, and KO 0141 derived from
P. citreo-viride B. IFO 4692 and
P. pedemontanum IFO 9583. Their structures have also been elucidated on the basis of their spectral data and some chemical evidence. Citreopyrones A, B, and C inhibited the growth of hypocotyls of lettuce seedlings.
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Masahiko Iyoda, Terumasa Kondo, Toshitaka Okabe, Haruo Matsuyama, Shig ...
1997 Volume 26 Issue 1 Pages
35-36
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A series of di-, tri-, and tetraferrocenylarenes were synthesized by using the nickel- and palladium-catalyzed cross coupling reactions of ferrocenylzinc chloride with the corresponding di-, tri-, and tetrahalogenoarenes. Redox properties of these ferrocenylarenes were studied by cyclic voltammetry in order to examine the intramolecular interaction between the ferrocenyl substituents.
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Osamu Sato, Zhongze Gu, Hiroyuki Etoh, Jun-ichi Ichiyanagi, Tomokazu I ...
1997 Volume 26 Issue 1 Pages
37-38
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Electrochemical preparation method and electromic properties of the mixed valence chromium cyanide thin film, which is one of the ferrimagnet with highest critical temparature (T
c) among molecule-based magnets, were described. The difference in the ability of the ligand substitution reaction between Cr
II and Cr
III was utilized to synthesize the prussian blue analogs. The obtained magnetic material exhibited an excellent electrochromic properties. This indicates the compound has a potential for future display devices, as well as tunable molecule-based magnetic devices.
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Masahiko Iyoda, Tamiko Yada, Shin-ichiro Tashiro, Hironori Maeda, Masa ...
1997 Volume 26 Issue 1 Pages
39-40
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The reaction of 1-chloro-1-tributylstannylethylenes with Fe
3(CO)
12 produces the dinuclear and trinuclear ferraindene complexes with the methylenediferracyclopropane derivatives. The structures of the ferraindene complexes were determined by X-ray analysis.
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Kiyoshi Kanamura, Hideharu Takezawa, Soshi Shiraishi, Zen-ichiro Takeh ...
1997 Volume 26 Issue 1 Pages
41-42
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A dynamic behavior of diethyl carbonate Electrolyte on lithium with a surface film, such as a solvent penetration into the surface film and a chemical reaction with lithium, was firstly detected by using
in situ FTIR spectroscopy.
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M. Y. Han, W. Huang, D. Zhang, T. J. Li
1997 Volume 26 Issue 1 Pages
43-44
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Uniform amorphous thin films of molecular semiconductor (NCTA)
2Ni(DMIT)
2 were electrodeposited onto ITO glass. A reversible and reproducible bistable electrical memory switching was observed in an asymmetrical sandwich-type device upon applying a small voltage. More than 10
6 cycles were repeated without failure.
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Kiyoshi Kanamura, Hidetoshi Naito, Zen-ichiro Takehara
1997 Volume 26 Issue 1 Pages
45-46
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We firstly claim that the unique performance of Li
4/3Ti
5/3O
4 as electrochemical materials in terms of a flat potential and an infinitesimal structural change is caused by a cation ordering of Li
+ and Ti
4+ at 16d sites in the spinel superstructure.
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Hideyuki Tagaya, Yu-ichi Suzuki, Jun-ichi Kadokawa, Masa Karasu, Koji ...
1997 Volume 26 Issue 1 Pages
47-48
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Model compounds of phenol resin waste such as prepolymers and substiuted diphenylmethanes were decomposed into their monomers by the reaction at from 300 to 430 °C with water in 10 ml tubing bomb reactor. The decomposition reactions were accelerated by the addition of alkali salts such as Na
2CO
3.
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Yasuhiko Shibutani, Shigeto Mino, Shen Shuang Long, Takayo Moriuchi-Ka ...
1997 Volume 26 Issue 1 Pages
49-50
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New optically active bis(12-crown-4) based electrodes for Na
+ were evaluated. The best selectivity (log
k = −2.3) was obtained when the sensors were used in association with NPOE as a plasticizing solvent mediator and NaHFPB as an anion excluder in PVC matrices. Na
+ selectivity against K
+ was augmented by a factor of nearly two using R,R- or S,S- bis(12-crown-4) compared with that of optically inactive bis(12-crown-4)s reported previously.
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Kazutoshi Haraguchi, Yusho Usami
1997 Volume 26 Issue 1 Pages
51-52
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Organic-inorganic hybrid materials composed of phenolic resin and silica were prepared by
in-situ polymerization of silicon alkoxides in phenolic resin matrix. The hybrid materials showed uniform morphology with very fine dispersion of silica. The transparency of the hybrid, the size of incorporated silica particles and its interface with matrix resin could be controlled. The uniform hybrid materials showed excellent improvements in mechanical properties.
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Norimasa Yoza, Sachiko Nakashima, Tetsuya Nakazato
1997 Volume 26 Issue 1 Pages
53-54
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The catalytic ability of alkaline phosphatase (EC3.1.3.1) to promote P-F bond hydrolysis was examined with a simple nontoxic P-F compound, monofluorophosphate (Na
2PO
3F), to obtain an insight into the enzymatic degradation of Sarin, a toxic P-F compound. The enzyme recognized inorganic monofluorophosphate as a substrate and accelerated its hydrolytic conversion to orthophosphate and fluoride ions at pH 7.2 - 9.0 and 30 °C by a factor of ten billion (10
10).
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Yukio Masaki, Nobuyuki Tanaka, Tsuyoshi Miura
1997 Volume 26 Issue 1 Pages
55-56
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A π-acid tetracyanoethylene (TCNE) and its derivative dicyanoketene dimethyl acetal (DCKDMA) were found to catalyze esterification of lauric acid with various types of alcohols. This mathod was successfully applied to methyl esterification of a variety of carboxylic acids including aromatic, α,β-unsaturated, α-hydroxy, and
N-Cbz and
N-Boc-protected α-amino acids without racemization at the range from room temperature to 60 °C. TCNE was also found to operate as a catalyst in transesterification reaction of methyl laurate.
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Ken-ichi Fujita, Masakazu Ikeda, Teruyuki Kondo, Take-aki Mitsudo
1997 Volume 26 Issue 1 Pages
57-58
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A series of novel thiolato-bridged titanium-ruthenium mixed metal complexes, Cp
2Ti(μ-SPh)
2RuClCp
*, Cp
2Ti(μ-SPh)
2RuHCp
* and [Cp
2Ti(μ-SPh)
2Ru(L)Cp
*][PF
6] (L = CH
3CN, t-BuCN) are prepared.
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Yutaka Ukaji, Yuuko Shimizu, Yuuichi Kenmoku, Alauddin Ahmed, Katsuhik ...
1997 Volume 26 Issue 1 Pages
59-60
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The catalytic asymmetric addition reaction of dialkylzinc to carbon-nitrogen double bond in 3,4-dihydroisoquinoline
N-oxide derivatives was achieved by utilizing a catalytic amount of dicyclopentyl (
R,
R)-tartrate to afford the corresponding (
S)-hydroxylamines in high optical yields up to 94% ee.
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Hiroyuki Kurihara, Shin-ichi Nishikiori, Toschitake Iwamoto
1997 Volume 26 Issue 1 Pages
61-62
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An anionic three-dimensional network host [Cd
8(CN)
19]
3− enclathrates a cationic mononuclear Cd complex guest [Cd(dien)
2]
2+, and a dinuclear Cd complex guest [Cd
2(CN)
3(dien)
2]
+, to form a novel inclusion compound [Cd(dien)
2]·[Cd
2(CN)
3(dien)
2]·[Cd
8(CN)
19]·3H
2O (dien = (H
2N(CH
2)
2)
2NH, diethylenetriamine).
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Masahiko Iyoda, Fatema Sultana, Ai Kato, Masato Yoshida, Yoshiyuki Kuw ...
1997 Volume 26 Issue 1 Pages
63-64
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The synthesis of 1,4-benzoquinone-linked fullerenes (
1 and
2) and an attempted synthesis of 1,2-benzoquinone-linked fullerenes (
9 and
10) are described with the interesting redox behavior of these benzoquinone-linked fullerenes.
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Yoshihiro Ito, Norio Hamamatsu, Oh Hyeong Kwon, Mitsuyoshi Ueda, Atsuo ...
1997 Volume 26 Issue 1 Pages
65-66
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Polyproline, which is an amphiphilic polypeptide, was incorporated into lysozyme by the recombinant DNA technique. The hydrophobicity of lysozyme increased with the incorporation of a longer polyproline. The bactericidal activity of lysozyme against Gram-negative bacteria increased with the hydrophobicity of the enzyme.
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Mi-Kyung Oh, Takeyoshi Okajima, Fusao Kitamura, Chi-Woo Lee, Koichi To ...
1997 Volume 26 Issue 1 Pages
67-68
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An excellent electrocatalysis of
N,
N′-dipentyl viologen, which is based on not the dissolved species but the adsorbed one, has been observed for the electroreduction of O
2 to H
2O
2 at glassy carbon electrode in neutral aqueous media. The rate constant for the catalytic reaction was estimated to be ca.10
6∼10
7 M
−1s
−1 based on cyclic and hydrodynamic voltammetry.
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Toshiya Okajima, Shinji Kurokawa
1997 Volume 26 Issue 1 Pages
69-70
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1-Formyl-7-isopropyl-4-methylazulene (
4) has been synthesized by DDQ oxidation method of 1-methyl group of guaiazulene (
1). The overall synthetic procedures from
1 to
4 were completed within 2 h, and almost quantitative yield was achieved. The compound (
4) was inaccessible so far, because of a poor yield of
4 in its total synthesis (<5%, overall), as well as in its preparation by non-selective oxidation of
1 (<1%).
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Mitsuo Hashimoto, Yumi Nakai, Masahiro Kohno, Kunihiko Tajima, Kenji K ...
1997 Volume 26 Issue 1 Pages
71-72
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Superoxide anion (O
2•−), generated in a strong alkaline DMSO solution and detected by direct 77 K EPR, was trapped with 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) and the resultant nitroxide radical, DMPO/O
2•−, has been found to be sufficiently stable for the subsequent EPR detection.
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Toshiaki Mori, Sanae Fujita, Yoshio Okahata
1997 Volume 26 Issue 1 Pages
73-74
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A lipid-coated β-
D-galactosidase could act as an efficient catalyst for transgalactosylation in the water-organic two phases: both the hydrophobic lipid-coated enzyme and alcohols were solubilized in isopropyl ether and mixed with an aqueous solution of lactose (a galactosyl donor). When a native β-
D-galactosidase was employed for the same reaction, neither the transgalactosylation nor the hydrolysis reaction proceeded due to the deactivation of the enzyme at the interface.
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Akiko Takaki, Katsuhiro Utsumi, Takeshi Kajiki, Tadashi Kuroi, Tatsuya ...
1997 Volume 26 Issue 1 Pages
75-76
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It was found that melamine derivatives bearing a guanidinium ion assemble a thymine-thiazolium ion and pyruvate in close proximity via hydrogen bonds to enhance the rate of the oxidative decarboxylation in CHCl
3-MeCN (9 : 1 v/v), where the guanidinium ion not only binds pyruvate but also activates it.
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A. M. Sarwaruddin Chowdhury, Yutaka Matsumi, Masahiro Kawasaki
1997 Volume 26 Issue 1 Pages
77-78
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O atoms in the
3P
2 state were detected by vacuum ultraviolet laser-induced fluorescence (VUV LIF) technique. The O(
3P
2) atoms were produced by the collision between the O atoms in the
1D excited state and collision partner N
2. O atoms in the
1D excited state were obtained by photodissociation of N
2O at 193 nm laser light. As O(
3P
2) species has their first transition in the VUV region, the probe laser was used to excite O(2p
3P
j) atoms to the O(3s
3S
o) state at 130.212 nm. A four wave difference frequency mixing (2ω
1−ω
2) process using Kr as nonlinear media was employed to generate 130.212 nm probe laser light.
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Takuhiro Otsuka, Youkoh Kaizu
1997 Volume 26 Issue 1 Pages
79-80
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In a crystal of double complex salt Na[Ru(bpy)
3][Cr(ox)
3] (bpy = 2,2′-bipyridine, ox
2− = C
2O
42−) obtained by mixing aqueous solutions of Na
3[Cr(ox)
3]•5H
2O and [Ru(bpy)
3]Cl
2•6H
2O, both luminescence from
3CT (metal-to-ligand charge-transfer) state of [Ru(bpy)
3]
2+ and
2E
g state of [Cr(ox)
3]
3− could be observed at 77 K, although the luminescence from
3CT was extremely small. Lifetime of the luminescence from
3CT becomes far shorter than that of single complex salts [Ru(bpy)
3]X•nH
2O (X = 2Cl
−, SO
42−). The large lifetime reduction of
3CT state indicates that the excitation energy transfer occurs via
3CT state of [Ru(bpy)
3]
2+ moiety in the double complex salt.
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Toshiya Okajima, Yoshimasa Fukazawa
1997 Volume 26 Issue 1 Pages
81-82
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Transition structures for [2,3]-Wittig rearrangement of dilithium salts of 2-oxa-4-(Z and E)-methylhexene-1-carboxylic acid (
1 and
2, respectively) have been located with
ab initio molecular orbital calculation at the level of 6-31G
* basis set. The origin of the observed stereoselectivity of [2,3]-Wittig rearrangement of
1 and
2 was clarified.
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Yuji Hotta, Keiichi Inukai, Masahiro Taniguchi, Akihiko Yamagishi
1997 Volume 26 Issue 1 Pages
83-84
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A smectite-type clay having alkanethiol groups on a basal plane has been synthesized. The clay has been revealed to be self-assembled on a gold surface by applying the quartz crystal microbalance (QCM) and the atomic force microscopy (AFM) methods.
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Takumi Konno, Yoshitaro Miyashita, Ken-ichi Okamoto
1997 Volume 26 Issue 1 Pages
85-86
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Treatment of
fac(
S)-[Ir(aet)
3] (aet = 2-aminoethanethiolate) with acid in water gave a novel dinuclear Ir(III) complex, [Ir
2(aet)
4(cysta)]
2+ (cysta = cystamine), in which two octahedral Ir(III) units are linked by a coordinated disulfide bond.
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Masaaki Yoshifuji, Yoshito Ichikawa, Kozo Toyota, Eiji Kasashima, Yosh ...
1997 Volume 26 Issue 1 Pages
87-88
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The group-6 metal tetracarbonyl complexes of 3,4-diphosphinidenecyclobutenes protected with the 2,4-di-
t-butyl-6-methylphenyl group were prepared and one of the rotamers, ligated with W(CO)
4, was confirmed by X-ray analysis while the other was analyzed by a chiral HPLC column.
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Michie Kira, Teruhiko Matsubara, Hiroaki Shinohara, Masahiko Sisido
1997 Volume 26 Issue 1 Pages
89-90
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An optically-active redox amino acid,
L-ferrocenylalanine was synthesized. The amino acid was incorporated into polypeptides in the form of a single
L-ferrocenylalanine unit or a
L-ferrocenylalanyl-
L-ferrocenylalanine unit. Those polypeptides showed reversible redox property on the cyclic voltammetry.
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Bunsho Ohtani, Takayuki Yako, Yoriaki Samukawa, Sei-ichi Nishimoto, Ki ...
1997 Volume 26 Issue 1 Pages
91-92
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Photoinduced reaction occurring at an aqueous solution-semiconductor interface was analyzed
in situ by reflection FT-IR spectroscopy. The photoinduced reflection spectral change, ΔR (= (R−R
0)/R
0), was recorded by using an IR cell consisting of a semiconductor (TiO
2 or CdS) thin film electrode, a thin layer of aqueous (S)-lysine solution, and a calcium fluoride window. Structure of adsorbed substrate and mechanism of photoinduced reaction were discussed.
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Masatoshi Kanesato, Toshiro Yokoyama, Toshishige M. Suzuki
1997 Volume 26 Issue 1 Pages
93-94
Published: 1997
Released on J-STAGE: March 01, 2004
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Reaction of tris(2-aminoethyl)amine coordinated to lanthanum(III) and gadolinium(III) with salicylaldehyde afforded Schiff-base complexes of tris[2-(salicylideneamino)ethyl] amine. In this reaction, a lanthanum(III) complex, which was supposed to be a reaction intermediate, was also obtained and characterized by X-ray crystallography. However, such a reaction intermediate of gadolinium(III) complex was not isolated under similar conditions. This difference was applied to the mutual separation of lanthanum(III) and gadolinium(III).
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Sakae Toyoda, Takeshi Tominaga, Yoshihiro Makide
1997 Volume 26 Issue 1 Pages
95-96
Published: 1997
Released on J-STAGE: March 01, 2004
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An automated gas chromatograph/electron capture detector (GC/ECD) system was developed to monitor the concentration of HCFC-22 in the urban atmosphere at intervals of 90 min. By using two columns in series we avoided the use of cryogen and dryer for preconcentration or sample drying. Oxygen was doped into the N
2 carrier gas to sensitize the ECD. Serial measurements of atmospheric HCFC-22 concentration were attempted in the central area of Tokyo.
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Atsushi Sudo, Kazuhiko Saigo
1997 Volume 26 Issue 1 Pages
97-98
Published: 1997
Released on J-STAGE: March 01, 2004
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The chiral oxazolidinone, derived from
cis-2-amino-3,3-dimethyl-1-indanol, was found to be an efficient chiral auxiliary in the asymmetric Diels-Alder reaction.
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Kazue Ohkura, Yukari Noguchi, Koh-ichi Seki
1997 Volume 26 Issue 1 Pages
99-100
Published: 1997
Released on J-STAGE: March 01, 2004
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Contrasting to the photoreaction of 6-chloro-1,3-dimethyluracil in benzene at ambient temperature in the presence of trifluoroacetic acid, whereby 1,3-dimethylcyclooctapyrimidine was produced as a sole cycloadduct, the similar photoreaction in frozen benzene at −15 ∼ −20 °C proceeded quite differently to give three novel photocycloadducts, 7-chloro-1,3-dimethyl-4b,5,7a,8-tetrahydropentaleno[1,2-e]pyrimidine-2,4-dione, 5-chloro-1,3-dimethyl-4b,7,7a,8-tetrahydropentaleno[1,2-e]pyrimidine-2,4-dione, and 6-chloro-10,12-diazapentacyclo[6.4.0.0
1,3.0
2,5.0
4,8]dodecane-9,11-dione.
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