-
Masashi Mizukami, Kazue Kurihara
1999 Volume 28 Issue 10 Pages
1005-1006
Published: 1999
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Interaction forces between glass surfaces in cyclohexane-ethanol binary mixtures were investigated using colloidal probe atomic force microscopy. An unusually long range attraction was found in the presence of ethanol in the concentration range of 0.1 ∼ 1.4 mol%. At 0.1 mol% ethanol, the attraction appeared at a distance of 35 ± 3 nm and turned into a repulsive force below 3.5 ± 1.5 nm upon compression. A possible explanation accounting for this long range attraction is the bridging of opposed adsorption layers of ethanol on the glass surfaces.
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Hideki Sugimoto, Kiyoshi Tsuge, Koji Tanaka
1999 Volume 28 Issue 10 Pages
1007-1008
Published: 1999
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A ruthenium carbonyl complex with unique monodentate SSC
2(CN)
22− was prepared, while analogous SSC
2Ph
22− derivative underwent electrophilic and nucleophilic attacks of CO
2 and CH
3OH to the thiolato and the CO ligands to produce the Ru complex with thio-carboxylic acid and methoxy carbonyl units.
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Shingo Ikeda, Shigeru Murata, Kunihiko Ishii, Hiro-o Hamaguchi
1999 Volume 28 Issue 10 Pages
1009-1010
Published: 1999
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The efficiency of the pyrene-sensitized decomposition of
N-phenylglycine (NPG) was enhanced by the addition of an electron acceptor, such as
p-dicyanobenzene. The reaction mechanism is discussed on the basis of observed Stern-Volmer constants for quenching of singlet excited state of pyrene (py
*) and transient absorption spectra. Examination of various electron acceptors shows that the efficient quenching of py
* by electron acceptors does not necessarily result in an increase in the NPG decomposition rate.
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Shuji Oishi, Masaya Kanoh, Nobuo Ishizawa
1999 Volume 28 Issue 10 Pages
1011-1012
Published: 1999
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Sodium chloride was successfully used as a new flux to grow the layered perovskite-type Na
2Ca
2Nb
4O
13 crystals by a slow cooling method. The rectangular thin plate-shaped crystals with sizes up to 1.2 mm × 1.2 mm × 0.03 mm were grown. The obtained crystals were colorless and transparent. The most suitable solute content was 0.4 mol%.
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Toshifumi Miyazawa, Eiichi Ensatsu, Kayoko Tanaka, Ryoji Yanagihara, T ...
1999 Volume 28 Issue 10 Pages
1013-1014
Published: 1999
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The superiority of the carbamoylmethyl ester as an acyl donor for the α-chymotrypsin-catalyzed kinetically controlled peptide synthesis was demonstrated in several segment condensations carried out in organic media with low water content. Then this approach was successfully applied to the construction of the Leuenkephalin sequence via the 4 + 1 segment condensation.
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Hiroaki Kawasaki, Nobuhiro Kihara, Toshikazu Takata
1999 Volume 28 Issue 10 Pages
1015-1016
Published: 1999
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A pseudorotaxane was prepared from dibenzo-24-crown-8 and a dibenzylammonium salt possessing dimethylphenyl and hydroxy groups at the both termini. Acylation of the pseudorotaxane by 3,5-dimethylbenzoic anhydride in the presence of tributylphosphine afforded corresponding rotaxane in 90% yield. Various rotaxanes were readily synthesized in excellent yields by this method.
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Hirokazu Ohkawa, Kenji Yoshida, Mai Saito, Kazuyoshi Uematsu, Kenji To ...
1999 Volume 28 Issue 10 Pages
1017-1018
Published: 1999
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The cathode performance of a lithium ion battery was investigated for β-Fe
2(SO
4)
3-type Li
3V
2(PO
4)
3 and Li
3(V
1−xZr
x)
2(PO
4)
3 (x = 0.05, 0.1, 0.15, 0.2). On TG-DTA measurements, Li
3V
2(PO
4)
3 exhibited two types of phase transition, while Li
3(V
1−xZr
x)
2(PO
4)
3 exhibited no phase transition. Powder X-ray diffraction analysis and conductivity measurements confirmed an evidence for the stabilization of the high temperature phase at room temperature. The discharge capacity of the Zr-substituted Li
3(V
1−xZr
x)
2(PO
4)
3 samples became much larger than that of the pure Li
3V
2(PO
4)
3 sample.
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Yan Xu, Ji-Qing Xu, Yong-Jiang Liu
1999 Volume 28 Issue 10 Pages
1019-1020
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The new mixed valence layered cluster compound, [V
vV
ivO
4(OH)·0.5H
2O]
n, contains the first two-dimensional V-O cation [V
vV
ivO
4]
nn+ with water molecules and OH
− anions interlayer region, and it’s structure was determinated by crystal X-ray diffraction, EPR and TG analysis.
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Anthony J. Arduengo, III, Matthias Tamm, Joseph C. Calabrese, Fredric ...
1999 Volume 28 Issue 10 Pages
1021-1022
Published: 1999
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The syntheses and characterizations are described for carbene•lithium complexes in which the lithium center is ligated only by carbon atoms. A single crystal X-ray diffraction structure determination on one adduct confirms the coordination environment. The C-Li distance at the carbene center is 215.5 pm. All other coordination to the lithium center originates from a substituted η
5-cyclopentadienyl ligand with an average C–Li distance of 225.4 (7) pm.
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Yasumasa Tomita, Kazutomo Asai, Kenkichiro Kobayashi
1999 Volume 28 Issue 10 Pages
1023-1024
Published: 1999
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Li
1−2xCu
xMn
2O
4 (x ≤ 0.10) were synthesized and x dependence of the lattice constant and the electric conductivity were studied. For x ≤ 0.05, Li-O bond length and AC conductivity were decreased by substitution of Cu for Li, and Mn-O bond length was increased with x. Conductivity for x = 0.10 is higher than that for LiMn
2O
4.
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Noboru Tanaka, Kiyotake Suenaga, Kaoru Yamada, Shu-zhen Zheng, Hai-she ...
1999 Volume 28 Issue 10 Pages
1025-1026
Published: 1999
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Novel bicyclic triols, attenols A (
1) and B (
2), were isolated from the Chinese bivalve
Pinna attenuata. The absolute stereostructures of
1 and
2 were determined by spectroscopic analysis and the modified Mosher’s method. These attenols exhibited moderate cytotoxicity against P388 cells.
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Kenji Shinohara, Kazuhito Hashimoto, Ryoichi Aogaki
1999 Volume 28 Issue 10 Pages
1027-1028
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It was proposed that a method to measure the magnetic susceptibility of a particle such as the biological cell suspended in a liquid phase without any kind of contact with the apparatus. This method utilizes the magnetic force acting on the particle under the high magnetic field gradient, which is balanced by the viscous force controlled by the fluid velocity. The magnetic susceptibility can be determined from the value of the fluid velocity when the suspended particle is stopped against the fluid motion by the magnetic force. An experimental result for a polystyrene micro-sphere proved a possibility of the
in vivo assay and separation of the living cells by using this method.
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Hiromitsu Kozuka, Masahiro Kajimura
1999 Volume 28 Issue 10 Pages
1029-1030
Published: 1999
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BaTiO
3 coating films were prepared from Ba(CH
3COO)
2-Ti(OC
3H
7i)
4-H
2O-CH
3COOH-C
3H
7i OH solutions containing poly(vinylpyrrolidone) with average molecular weight of 630000. Formation of crack-free BaTiO
3 films 1.2 μm in thickness was successfully achieved via single-step, non-repetitive dip-coating. The film had relatively dense mocrostructure in SEM scale and transmitted visible light.
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Yutaka Amao, Keisuke Asai, Tokuji Miyashita, Ichiro Okura
1999 Volume 28 Issue 10 Pages
1031-1032
Published: 1999
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Poly(styrene-co-trifluoroethylmethacrylate), (poly-styrene-co-TFEM), is synthesized and applied to the matrix of optical oxygen sensing using phosphorescence quenching of PtOEP by oxygen. Stern-Volmer constant of poly-styrene-co-TFEM film is estimated to be 0.39 Torr
−1 (1 Torr =133.322 Pa) indicating that PtOEP-poly-styrene-co-TFEM film is higher sensitive device for oxygen.
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Makoto Handa, Daisuke Yoshioka, Yasuyoshi Sayama, Kimie Shiomi, Masahi ...
1999 Volume 28 Issue 10 Pages
1033-1034
Published: 1999
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The “dimer-of-dimers” complex of ruthenium(II,III) pivalate cation dimer [{Ru
2(O
2CCMe
3)
4}
2(μ-tcnq)(H
2O)
2](BF
4)
2 (
1) (tcnq=7,7,8,8-tetracyanoquinodimethane) has been prepared and characterized. The X-ray structure analysis of
1 showed that tcnq connects the Ru(II,III) dimers with an Ru-N distance of 2.323(7) Å. The Ru-Ru distance 2.263(1) Å is nearly the same as that of the parent cation dimer [Ru
2(O
2CCMe
3)
4]
+ (2.260(1) Å). The antiferromagnetic interaction between the Ru(II,III) cores through the tcnq molecule is fairly weak.
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Akinori Kuzuya, Masahiko Akai, Makoto Komiyama
1999 Volume 28 Issue 10 Pages
1035-1036
Published: 1999
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By using non-covalent combinations of Lu(III) ion and two DNA oligomers, each of which is complementary with a part of RNA, the RNA is sequence-selectively hydrolyzed. When all the ribonucleotides, except for three consecutive ones, form base-pairs with the DNA oligomers, the selective scission occurs at the 3′-side of the middle of these three non-pairing ribonucleotides.
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Mikio Miyake, Koji Yasuda, Takayuki Kashihara, Toshiharu Teranishi
1999 Volume 28 Issue 10 Pages
1037-1038
Published: 1999
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Introduction of the functional groups to the carbon hexagonal plane of the
sp2-carbon, which may provide the novel properties to carbon materials, proceeds by the ligand exchange reaction of ferrocene with the
sp2-carbon.
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Yosuke Nakamura, Takahiro Fujii, Sachiko Sugita, Jun Nishimura
1999 Volume 28 Issue 10 Pages
1039-1040
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In the [2.3](2,7)phenanthrenophanes prepared by the intramolecular [2 + 2] photocycloaddition of 1,3-bis(7-vinyl-2-phenanthryl)propane, excimer fluorescence was observed for not only
syn- but also
anti-isomer, though the maximal position of the latter was slightly blue-shifted relative to the former.
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Toshio Ihara, Kenta Kurohara, Akinori Jyo
1999 Volume 28 Issue 10 Pages
1041-1042
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DNA oligomer, dT
20 , was immobilized onto the organic nanospheres. The spheres aggregated only in the presence of complementary RNA under a special set of conditions. The aggregation was pseudo-reversible for the temperature change. The techniques of the polynucleotide-directed aggregation should be useful for constructing the structure having mesoscopic dimensions.
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Tohru Yamada, Kyosuke Suzuki, Kentaro Hashimoto, Taketo Ikeno
1999 Volume 28 Issue 10 Pages
1043-1044
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In the presence of a catalytic amount of the nickel(0) complex derived from Ni(acac)
2 or NiCl
2 with DIBAL or BuLi, nitrous oxide (N
2O) was captured and activated to oxidize phosphine(III) into the corresponding phosphine oxide. Bidentate phosphines, for example, 1,3-bis(diphenylphosphino)propane (dppp), were employed as effective ligands for N
2O oxidation and were recovered after the reaction.
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Yasunao Kuriyama, Shigero Oishi
1999 Volume 28 Issue 10 Pages
1045-1046
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The life time of
cis-azobenzene in zeolite supercage is twenty times longer than that in benzene at room temperature. The kinetic studies indicate that the thermal isomerization proceeds through inversion mechanism. Activation parameters show that the zeolite nanospace gives the same environment as that of gas phase.
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Gratian R. Bamwenda, Kazuhiro Sayama, Hironori Arakawa
1999 Volume 28 Issue 10 Pages
1047-1048
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Herein we report the first finding on the photocatalytic production of oxygen from the irradiation of a CeO
2-H
2O-Ce
4+aq aqueous suspension. The O
2 yield strongly depended on the duration of irradiation, CeO
2 concentration, concentration of Ce
4+aq cations, and pH of the suspension. The optimum photoproduction for O
2 was obtained under the following operating conditions: Illumination time > 15 h, CeO
2 concentration: 2.5-5 g dm
−3, [Ce
4+]: 4-5 mM, pH < 2, and illumination wavelength < 450 nm. The studied system utilizes CeO
2 to accomplish the initial light absorption, charge separation, and O
2 evolution from the interaction of H
2O molecules with holes in the CeO
2 valence band, in the presence of Ce
4+aq species as an acceptor of conduction band electrons.
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Takakazu Yamamoto, Byoung-Ki Choi, Masataka Takeuchi, Kenji Kubota
1999 Volume 28 Issue 10 Pages
1049-1050
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Poly(
p-phenylene), PPP, becomes soluble by nitration and two types of nitrated PPPs give an
Mn of 5800 ± 400 in the GPC analysis. Poly(pyridine-2,5-diyl), PPy, has been found to be soluble in hexafluoro-
i-propanol, and its GPC analysis gives an
Mn and
Mw of 6800 and 23000, respectively.
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Kazuo Tsujimoto, Jun’ichirou Sugiura, Nobuaki Takemori, Taku Miz ...
1999 Volume 28 Issue 10 Pages
1051-1052
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All-
trans-9-demethyl-11-methylretinal was synthesized to elucidate the chromophoric interaction between hydrophobic part in retinochrome and 9-methyl substituent of retinal. Photoirradiation of its pigment efficiently gave the 11-
cis-isomer in 90% regioselectivity, whereas that of 9-demethylretinochrome provided the 11-
cis isomer in 49% selectivity. Structural contribution to regiospecific photoisomerization was proved, in comparison with the other retinochrome analogues, that 9- or 11-methyl substituent is a requisite for highly regioselective photoisomerization, but 13-methyl group is not.
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Junzo Nokami, Masahiro Osafune, Yuichiro Ito, Fumiaki Miyake, Shin-ich ...
1999 Volume 28 Issue 10 Pages
1053-1054
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Electrolysis of silylated pyrimidines with protected arylthioribose, in the presence of a catalytic amount of NBS or Br
2 as a mediator in an undivided cell, gave the corresponding
N-glycosides (nucleosides) in good yield.
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Satoshi Nakagawa, Noriko Haruna, Delicia E. Acosta, Tadateru Endo, Tak ...
1999 Volume 28 Issue 10 Pages
1055-1056
Published: 1999
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Hydrogenation of methyl 2-furoylacetate over TA-MRNi reduced the three unsaturated bonds to give methyl tetrahydro-2-furoylacetate, the enantiomeric excess (ee) of which at the 3-position was 77%, whereas the 4-position was racemic. Under the same conditions, the substrate of 4-methoxycarbonyl analogue was resulted in hydrogenation of only the ketone moiety to give the corresponding chiral
sec-alcohol having a furan ring in 69% ee.
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Tsunehisa Kimura, Masafumi Yamato, Wataru Koshimizu, Takahiko Kawai
1999 Volume 28 Issue 10 Pages
1057-1058
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Paraffin aligns in the magnetic field (9T) during crystallization from melt, forming crystallites oriented with respect to the magnetic field. Discussion is made about the anisotropic structure responsible for the magnetic orientation.
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Mandeep Singh Bakshi, Hidekazu Doe, Norio Sakurada, Ryuichi Arakawa
1999 Volume 28 Issue 10 Pages
1059-1060
Published: 1999
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The transfer of lauryltrimethylammonium (LTA
+) and hexadecyltrimethyl-ammonium (HTA
+) cations facilitated by dibenzo-15-crown-5 (DB15C5), DB18C6 and DB21C7, from aqueous phase to 1,2-dichloroethane (DCE) phase were studied. In the presence of DB15C5, ambiguous wave was observed which became somewhat prominent in the presence of DB18C6 and then irreversible in the presence of DB21C7. Such waves have been attributed to the facilitated transfer of LTA
+ and HTA
+ cations across the interface in the form of surfactant ion-crown ether (CR) complexes. On the basis of electrospray ionization mass spectroscopy (ESI-MS) measurements, the stoichiometry of such a complex has been proposed to be 1:1. It has also been observed by interfacial tension (γ) measurements that the facilitated transfer becomes irreversible once the immiscible interface is fully occupied by the adsorption of amphiphilic surfactant monomers.
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Tetsu Yonezawa, Shin-ya Onoue, Toyoki Kunitake
1999 Volume 28 Issue 10 Pages
1061-1062
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Reduction of AuCl
4− by sodium borohydride in the presence of quaternary ammonium disulfide gave an aqueous dispersion of cationic gold particles in nano-dimension. These cationic nanoparticles could be assembled effectively on an anionic amphiphile layer with a close-packed structure.
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Ze-Hua Liu, Shao-Yong Yang, Chun-Ying Duan, Xiao-Zeng You
1999 Volume 28 Issue 10 Pages
1063-1064
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A novel macrocyclic tetranuclear copper(II)-copper(I) mixed-valence complex was prepared and characterized by spectroscropic and crystallography structure analysis. Each tetranuclear unit connected to the neighbor one by one using the Cu···S bond with the type of apical Cu(1)···S(3B) bond forming an infinite step chain.
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Shigekazu Matsui, Yasushi Tohi, Makoto Mitani, Junji Saito, Haruyuki M ...
1999 Volume 28 Issue 10 Pages
1065-1066
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New bis(salicylaldiminato) titanium complexes were synthesized and investigated as ethylene polymerization catalysts. These complexes, when activated with methylalumoxane, exhibited one of the highest activities displayed by group 4 transition metal complexes having no cyclopentadienyl ligand(s).
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Toshio Nakamura, Kenshin Niwa, Manabu Fujiwara, Takayuki Matsushita
1999 Volume 28 Issue 10 Pages
1067-1068
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Novel dinuclear manganese(III) complexes, Mn
III2(
N-PhO-sal)
2(X-sal-
m-xylylene) (X = H, 3-MeO) have been prepared by the ligand substitution reaction and characterized, where
N-PhOH-salH and X-sal-
m-xylyleneH
2 denote
N-2-hydroxyphenylsalicylideneamine and
N,N′-di-substituted-salicylidene-
m-xylylenediamine, respectively. These complexes have been found to decompose hydrogen peroxide catalytically (H
2O
2 /Mn < 100), cycling their oxidation levels between Mn
2 (III,III) and Mn
2 (II,II) with dioxygen evolution.
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Yasunori Yamamoto, Ryou Fujikawa, Akihiko Yamada, Norio Miyaura
1999 Volume 28 Issue 10 Pages
1069-1070
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The hydroboration of terminal allenes with pinacolborane was carried out at 50 °C in the presence of a Pt(dba)
2/2PR
3 catalyst. The formation of one of three possible monohydroboration products was regioselectively synthesized by choosing an appropriate phosphine ligand.
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Kingo Uchida, Go Masuda, Yoshifumi Aoi, Koji Nakayama, Masahiro Irie
1999 Volume 28 Issue 10 Pages
1071-1072
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Tetrathiafulvalene (TTF) derivatives with diarylethene moieties have been synthesized. A derivative having 2,4,5-trimethylthiophene rings as the aryl groups showed photochromism, while a derivative with 2,5-dimethylthiophene rings did not show any color change by UV irradiation. The different reactivity was ascribed to the difference in the conformation of thiophene rings in the two derivatives.
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Kimihiro Matsukawa, Shouji Fukui, Nobuyuki Higashi, Masazo Niwa, Hiros ...
1999 Volume 28 Issue 10 Pages
1073-1074
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Photo-radical copolymerization of 3-methacryloxypropyltrimethoxysilane was carried out by using polymethylphenylsilane as a macro-photoinitiator to form polysilanemethacryloxypropyltrimethoxysilane copolymers. Organic-inorganic hybrid thin films with highly dispersed polysilane segments were successfully prepared from the copolymers by a sol-gel method. Refractive index and surface morphology of the hybrid thin films were found to change by UV irradiation.
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Katsuaki Kuge, Shinji Inomata, Hiromi Tobita, Hiroshi Ogino
1999 Volume 28 Issue 10 Pages
1075-1076
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Thermal reactions of (Ph
2C
2S
2)
4Fe
2 with Cp′
2Ru
2(CO)
4 (Cp′ = η
5-C
5H
4SiMe
3, η
5-C
5Me
5 (Cp
*)) gave new paramagnetic heterodinuclear complexes (Ph
2C
2S
2)Fe(Cp′Ru)(μ-Ph
2C
2S
2)
2 bridged by two dithiolene ligands.
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Satoshi Kobayashi, Kenji Hanabusa, Masahiro Suzuki, Mutsumi Kimura, Hi ...
1999 Volume 28 Issue 10 Pages
1077-1078
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Porous titania with fibrous structure has been prepared, via sol-gel method, from a physical gel of titanium tetraisopropxide by a low molecular weight organogelator.
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Ken-ichi Shimizu, Junji Shibata, Atsushi Satsuma, Tadashi Hattori
1999 Volume 28 Issue 10 Pages
1079-1080
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A significant effect of carbon number on the catalytic property was observed for the selective reduction of NO by
n-alkanes over Ag-Al
2O
3 catalyst; the higher alkanes as the reductant resulted in the higher activity and the higher water-tolerance.
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Mathew George, Suresh Das
1999 Volume 28 Issue 10 Pages
1081-1082
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Nonlinear optical (NLO) properties of some azobenzene linked cholesterol derivatives have been described. The presence of donor and acceptor moieties imparts electrooptical and NLO properties to these molecules. Their NLO properties have been studied by electric field poling as well as hyper-Rayleigh scattering techniques. Few of these compounds exhibited NLO activity comparable to that of quartz.
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Fumitoshi Kakiuchi, Motohiro Sonoda, Takuya Tsujimoto, Naoto Chatani, ...
1999 Volume 28 Issue 10 Pages
1083-1084
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The reaction of aromatic nitriles with triethoxyvinylsilane proceeded in the presence of a Ru(H)
2(CO)(PPh
3)
3-catalyst to give the corresponding C-H/olefin coupling products in high yields. The nitrile group is capable of directing the ruthenium to the
ortho C-H bond
via π-bonded mode.
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Jin-Gang Liu, Bao-Hui Ye, Hui Chao, Qi-Xiong Zhen, Liang-Nian Ji
1999 Volume 28 Issue 10 Pages
1085-1086
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A novel molecular “light switch”, [Ru(bpy)
2(HNOIP)]
2+ (HNOIP = 2-(2-hydroxy-5-nitrophenyl)imidazo[4,5-
f][1,10]phenanthroline), for DNA was developed. In aqueous solution the suppressed luminescence can be revived by the presence of Poly[dA]·Poly[dT], Poly[dG]·Poly[dC] and calf thymus DNA.
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Ming-Liang Tong, Hung Kay Lee, Shao-Liang Zheng, Xiao-Ming Chen
1999 Volume 28 Issue 10 Pages
1087-1088
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Five cubane-type complexes comprising similar [M
4O
4]
n+ cores (M = Zn(II), Cd(II), Mn(II), Co(II) or Ni(II)) synthesised in a facile route utilizing the
gem-diol form of di-2-pyridyl ketone have been characterised by X-ray structural analysis. Both Zn(II) and Cd(II) complexes show room-temperature emission upon photo-excitation at 300 nm.
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Kei Oishi, Tsutomu Ishi-i, Masahito Sano, Seiji Shinkai
1999 Volume 28 Issue 10 Pages
1089-1090
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A [60]fullerene-containing amphiphile bearing two ammonium groups was synthesized. When the methanol solution was left at room temperature for a few days, it was totally transformed into an organic gel. The transformation process was fully characterized by transmission electron microscopy and X-ray diffraction. This is the first example for the [60]fullerene-containing organic gel.
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Masahito Sano, Ayumi Kamino, Seiji Shinkai
1999 Volume 28 Issue 10 Pages
1091-1092
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Langmuir-Blodgett (LB) films of a short chain carboxyazobenzene derivative on mica exhibit nearly straight tape structures 1 nm thick, 80 nm wide, and over several μm long at pH 7.0. Lowering pH causes the tapes to be wavy and irregular without coagulation. The fraction of straight tapes at a constant salt concentration increases smoothly till pH 7, then drops sharply. Above 8, no transfer occurs. The fraction of Na per molecule in the film also increases with pH and becomes 0.5 at pH 7. The wavy tapes are found to become straight even with a slight ionization. An importance of the charge distribution rather than the total charge density is suggested.
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Michio Higashijima
1999 Volume 28 Issue 10 Pages
1093-1094
Published: 1999
Released on J-STAGE: October 01, 2003
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Tris(acetylacetonate)ruthenium, Ru(acac)
3, successfully reacts with the lacunary heteropolyoxometalate, K
8[SiW
11O
39] under hydrothermal conditions (6 MPa nitrogen at 200 °C), to give the mono-substituted heteropolyanion, [SiW
11O
39Ru(III)(H
2O)]
5−. The heteropolyanion shows notable activity on the air oxidation of alkylaromatics at 200 °C in water as solvent.
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Boonsong Kongkathip, Rongsan Sookkho, Ngampong Kongkathip, Walter C. T ...
1999 Volume 28 Issue 10 Pages
1095-1096
Published: 1999
Released on J-STAGE: October 01, 2003
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Both diastereoisomers of 1,4-dimethyl-2,8-dioxabicyclo[3.2.1]octane-4-caboxylic acid ester (
3, 4) and the 4-hydroxy methyl analogues (
5, 6) were synthesised from ethyl acetoacetate and diethyl malonate respectively. The key step of these process involved intramolecular cyclisation using palladium chloride as catalyst.
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Tomohiko Inomata, Masaaki Abe, Toshihiro Kondo, Keisuke Umakoshi, Kohe ...
1999 Volume 28 Issue 10 Pages
1097-1098
Published: 1999
Released on J-STAGE: October 01, 2003
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Self-assembled monolayers (SAMs) of non-heme diiron(III) biomimetic complexes have been prepared on Au(111) electrode surfaces to explore redox properties of diiron centers in aqueous solution in a wide pH range. The diiron(III) SAMs exhibited the proton-coupled electron-transfer reaction (1H
+/1e
−) in water.
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Xinsheng Li, Jong-San Chang, Sang-Eon Park
1999 Volume 28 Issue 10 Pages
1099-1100
Published: 1999
Released on J-STAGE: October 01, 2003
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Ni/ZrO
2 catalysts with more than 10wt % Ni loading give a birth of a large amount of carbon deposition, but the carbon plays as an intermediate to react with CO
2, which is contributed to both high activity and good stability towards carbon dioxide reforming of methane.
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Yasuyuki Matsumura, Wen-Jie Shen, Yuichi Ichihashi, Mitsutaka Okumura
1999 Volume 28 Issue 10 Pages
1101-1102
Published: 1999
Released on J-STAGE: October 01, 2003
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Methanol is effectively synthesized from carbon monoxide and hydrogen at a reaction temperature as low as 170 °C over Pd/CeO
2 in which the palladium species are cationic after reduction with hydrogen at 300 °C.
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Akihiko Kudo, Satoshi Hijii
1999 Volume 28 Issue 10 Pages
1103-1104
Published: 1999
Released on J-STAGE: October 01, 2003
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Bi
2W
2O
9, Bi
2WO
6, and Bi
3TiNbO
9 consisting of layered structure with perovskite slabs interleaved with Bi
2O
2 layers showed photocatalytic activities for H
2 evolution from an aqueous methanol solution and O
2 evolution from an aqueous silver nitrate solution. Bi
2WO
6 with the Aurivillius structure and a 2.8 eV band gap was active for the O
2 evolution reaction under visible light irradiation (λ > 420 nm).
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