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Masamichi Fujihira, Daisuke Aoki, Yoh Okabe, Hajime Takano, Hirofumi H ...
1996 Volume 25 Issue 7 Pages
499-500
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The effect of capillary force due to surface water on friction force microscopy (FFM) was examined by comparing FFM images on oxidized Si surfaces partially covered with chemically bound hydrocarbon (HC) monolayers
in vacuo and in an ambient atmosphere. It was found also from force-distance curves and FFM under various relative humidities that adhesive and friction forces observed on the hydrophobic HC covered surface were almost independent of the humidity, while those on the hydrophilic bare oxidized Si surface increased with an increase in the humidity. The higher friction observed on the oxidized Si in the higher humidity was interpreted by the higher effective normal load due to the higher capillary force which originated from a surface water film formed by adsorption of water vapor in the humid air. The results suggest a novel scanning hydrophilicity microscope under a controlled humidity which can be used to map local hydrophilicities of a sample surface in a x-y plane.
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Hitoshi Muguruma, Shu Hotta, Isao Karube
1996 Volume 25 Issue 7 Pages
501-502
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5,5′-Bis[(2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclopentyl)methyl]-2,2′-bithiophene crystallizes in the monoclinic system with space group
P2
1⁄
c. Because of the presence of the bulky terminal groups of 2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclo-pentyl, the compound shows unique crystallographic features compared with previously reported bithiophene and its derivatives.
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You-Moon Jeon, Dongmok Whang, Jaheon Kim, Kimoon Kim
1996 Volume 25 Issue 7 Pages
503-504
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A simple, one-step, high-yield synthesis of a rotaxane and pseudorotaxane based on cucurbituril and spermine is presented. Various spectroscopic techniques and X-ray diffraction methods were used to characterized the supramolecular species.
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Shozi Mishima, Tsuyoshi Nakajima, Tsuneo Fujii
1996 Volume 25 Issue 7 Pages
505-506
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Novel local structural parameters representing the nature of functional group and residual moiety of acids and bases were evaluated successfully from the formation constants of the 1:1 hydrogen-bond complexation in CCl
4 reported in literatures.
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Gong-Liang Li, Tatsumi Ishihara, Hiroyasu Nishiguchi, Yoshihiko Moro-o ...
1996 Volume 25 Issue 7 Pages
507-508
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The catalytic dehydrofluorination of CF
3CH
3 into CF
2CH
2 was studied over various metal phosphates in a fixed-bed reactor. The Mg
2P
2O
7 catalyst exhibited moderate activity, higher selectivity and greater stability. The active sites for CF
2CH
2 formation are weak acid sites of the catalysts.
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Hiroshi Fukumura, Yoshikazu Yoneda, Hitoki Takahashi, Hiroshi Masuhara
1996 Volume 25 Issue 7 Pages
509-510
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Flat surfaces of compressed pellets made of copper phthalocyanine powders were excited by nanosecond laser pulses and their time-resolved extinction coefficients were obtained by using regular reflection spectroscopy independent of Kramers-Kronig transformation. The results showed transient depletion at the peaks of the ground state absorption spectra, which is due to a change in thermal population in vibrational states. The decay of the transient depletion was well described with the temperature dependency of extinction coefficient based on Sulzer-Wieland approximation and one-dimensional thermal diffusion towards the deep parts of the pellet samples.
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Giancarlo Fantin, Marco Fogagnolo, Emanuela Marotta, Alessandro Medici ...
1996 Volume 25 Issue 7 Pages
511-512
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The reduction of bicyclo[3.2.0]hept-3-en-6-ones
1a,
b with Baker’s yeast to a mixture of enantiomerically pure (6
S)-
endo- and (6
S)-
exo-alcohols
2a,
b and
3a,
b respectively is described. Furthermore the oxidation of the racemic
endo-alcohols
2a,
b with
Bacillus stearothermophilus afforded the corresponding ketones with high enantiomeric excesses resolving the
endo-enantiomer. In the same conditions the
exo-alcohols
3a,
b are not oxidized.
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Ken-ichi Fujita, Yoshihisa Watanabe, Take-aki Mitsudo
1996 Volume 25 Issue 7 Pages
513-514
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A trifluoromethyl-substituted π-vinylcarbeneiron complex reacts with [KB(sec-Bu)
3H] or phenyllithium to afford difluorinated trimethylenemethane iron complexes. This is the first example of the conversion of a π-vinylcarbeneiron complex to a trimethylenemethane complex.
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Masaharu Tsuji, Hiroaki Ishimi, Yukio Nishimura
1996 Volume 25 Issue 7 Pages
515-516
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The positive ion-negative ion reactions of Kr
+(
2P
1⁄2,3⁄2) with C
6F
6− and SF
6− have been spectroscopically studied in the flowing afterglow. The recombination and neutralization reactions leading to KrF
* excimers and Kr
* atoms, respectively, were found to compete with each other. The relative formation ratio of KrF
*/Kr
* in the Kr
+(
2P
1⁄2,3⁄2)/C
6F
6− reaction was much smaller than that in the Kr
+(
2P
1⁄2,3⁄2)/SF
6− reaction.
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Atsunori Mori, Hiroyoshi Sato, Katsuya Mizuno, Tamejiro Hiyama, Koji S ...
1996 Volume 25 Issue 7 Pages
517-518
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Novel 1,1-difunctionalized disiloxanes are synthesized by the alkylative cleavage of cyclic siloxane using several alkyllithiums followed by quenching with chlorosilanes. The prepared difunctionalized siloxanes are subjected to polyaddition through platinum catalyzed hydrosilylation.
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Hideo Nagashima, Yoshiyuki Kato, Hirohisa Satoh, Naoki Kamegashima, Ke ...
1996 Volume 25 Issue 7 Pages
519-520
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Thermal study of a C
60 derivative containing a siloxane structure revealed that it was unstable above 350 °C. A major decomposition pathway was formation of C
60 and (Me
3Si)
2O presumably
via homolysis of bonds between the α-carbon of the silyl group and the cage carbon. By careful control of the crucible temperature below 350 °C, amorphous vapor-deposited thin films on NaCl or mica were successfully prepared.
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Nobuo Kimizuka, Tatsuo Wakiyama, Toyoki Kunitake
1996 Volume 25 Issue 7 Pages
521-522
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Transport of alkali-ions across black lipid membranes (BLM) formed from cationic and anionic, double-chain amphiphiles was characterized by the charge pulse relaxation technique. Amphiphiles containing an ether linkage in the alkyl tail portion displayed enhanced transport rates for sodium and potassium ions, while such selectivity is not observed for the related amphiphile without the ether linkage.
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Masato Tominaga, Junko Yanagimoto, Alaa-Eldin F. Nassar, James F. Rusl ...
1996 Volume 25 Issue 7 Pages
523-524
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Chlorella ferredoxin in solution was found to be incorporated into the cast films of ammonium lipids on basal plane pyrolytic graphite (BPG) electrodes
via ion exchange between the lipid counter anion and negatively charged ferredoxin and was embedded in them without denaturation in a way to undergo direct electron transfer reactions with the electrode.
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Heqing Tang, Akira Kitani, Tomoyuki Yamashita, Yoshifumi Ota, Masaru S ...
1996 Volume 25 Issue 7 Pages
525-526
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Polyaniline was possibly doped with cresol-sulfonic acid, though it failed to electrodeposit the polymer from solutions of aniline in cresol-sulfonic acid. The presence of cresol-sulfonate anions changed the redox peaks of the polymer in thier positions and heights. Catalytic oxidation of cresol-sulfonic acid was observed on polyaniline-filmed electrodes at potentials of a limited interval.
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Maki Hamaguchi, Hideo Sawada, Jun Kyokane, Katsumi Yoshino
1996 Volume 25 Issue 7 Pages
527-528
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Perfluoropropylation of poly(
p-phenylene) (PPP) was carried out with the intention of obtaining soluble PPP dervatives. The resulting polymers were chracterized by UV/vis and IR spectroscopy. An electroluminescent device emitting blue-green light depending on the bias voltage was fabricated from this polymer.
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Ichizo Yagi, Seiichiro Nakabayashi, Kohei Uosaki
1996 Volume 25 Issue 7 Pages
529-530
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In situ optical second harmonic generation(SHG) technique was employed to investigate the electrochemical oxidation of formaldehyde on a polycrystalline Pt electrode. At 532 nm excitation, the SH signal generated at a Pt surface seems to be enhanced by the existence of adsorbed CO and can be related to the surface coverage of CO(a) which cannot be determined by the electrochemical methods. Thus, the potential dependence of the SH signal provides useful information to understand the mechanism of this reaction.
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Hiroaki Yamanouchi, Tetsuo Saji
1996 Volume 25 Issue 7 Pages
531-532
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A copper phthalocyanine
1 thin film and photoimage were formed on a polyester film by irradiation of an aqueous dispersion containing a surfactant with an azobenzene group
2a, dispersed
1, hydroquinone
3 and 0.1 M HCl. A spectroscopic study showed that the photochemical reduction of
2a with
3 leads to the deposition of
1.
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Hajime Kawanami, Kozo Toyota, Masaaki Yoshifuji
1996 Volume 25 Issue 7 Pages
533-534
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Phenylphosphaethenes carrying two to four phosphoruscarbon double bonds on a benzene ring were prepared and their palladium complex formations were studied. The palladium complexes reacted with alkyllithium reagents to give the corresponding
o-alkylation products.
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Ruikang Tang, Zihou Tai, Yiqun Chao
1996 Volume 25 Issue 7 Pages
535-536
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The crystallization are selective when the monolayer of 9-(hexadecyl)imino-4,5-diazafluorene was spread on the surface of the mixed supersaturated solution of CuSO
4·5H
2O and Na
2SO
4. In the experiment, CuSO
4·5H
2O and its (010) face are chosen to form under the monolayer; but the crystallization of Na
2SO
4 still occurs at the bottom of the solution.
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Hiroshi Yamashita, Koji Amano, Satoru Shimada, Koichi Narasaka
1996 Volume 25 Issue 7 Pages
537-538
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A terphenylboronic acid
1 and its silylated derivative
2 are prepared from (2-nitrophenyl)acetic acid for the purpose of controlling stereochemistry of synthetic organic reactions. These boronic acids are found to recognize
α and
β-anomers of 2-deoxyribofuranosides. That is, when these boron compounds are added to a 1 : 1 mixture of
α and
β-
t-butyl 5-
O-benzyl-2-deoxy-
D-ribofuranosides, the boronic acids
1 and
2 from the corresponding boronates preferentially with the
β-anomer.
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Hiroshi Yamashita, Koichi Narasaka
1996 Volume 25 Issue 7 Pages
539-540
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1-Hydroxy-6,8-diphenyl-1,2,3,4-tetrahydro-2-oxa-1-boranaphthalene (terphenylboronic acid
1), is employed for stereoselective reduction of acyclic and cyclic
β-hydroxy ketones. The terphenylboronic acid
1 and acyclic
β-hydroxy ketones
2 are converted to the corresponding boronates by azeotropic removal of water. The resulting boronates are treated
in situ with reducing reagents to give
syn 1,3-diols
3 almost exclusively.
Anti α-substituted
β-hydroxy ketones
8 are also reduced to give
anti,
anti 1,3-diol
9 stereoselectively. Furthermore, the reduction of 3-hydroxy-1-cyclopentanone gives a
cis diol
11 in high selectivity.
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Isao Mochida, Keiichi Kuroda, Yuji Kawabuchi, Shizuo Kawano, Yuji Mats ...
1996 Volume 25 Issue 7 Pages
541-542
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Oxidative capture and recovery of SO
2 in form of H
2SO
4 was examined over pitch based active carbon fibers (P-ACF-OG-15A and -20-A). The fiber calcined at 1100 °C was found to exhibit a remarkable activity to remove completely 1000 ppm SO
2 at a contact time of 1 × 10
−3 g·min·ml
−1 with 10% H
2O at 30 °C. Hydrophobicity appears important to show such a high activity.
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Hiroto Harayama, Toyohiro Kozera, Masanari Kimura, Shuji Tanaka, Yoshi ...
1996 Volume 25 Issue 7 Pages
543-544
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By the catalysis of palladium(0),
S-allyl thiocarbamates
1 react with aryl iodides and vinyl bromides to give allyl aryl sulfides and allyl vinyl sulfides, respectively, in good yields.
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Makoto Shimizu, Kouji Kume, Tamotsu Fujisawa
1996 Volume 25 Issue 7 Pages
545-546
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In the presence of a catalytic amount of TiBr
4 or TiI
4, the reaction of silyl ketene acetals with imines smoothly proceeds to give the corresponding β-amino esters in high yield with high
anti-selectivity.
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Yoshio Suzuki, Tatsuya Morozumi, Yusuke Kakizawa, Richard A. Bartsch, ...
1996 Volume 25 Issue 7 Pages
547-548
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Three polyether compounds (
1-3) which have more than two fluorescent moieties in the both terminals were synthesized, and their complexation properties with Tb
3+ were discussed. After formation of complex with Tb
3+, sharp fluorescence lines were observed at visible region due to intramolecular energy transfer from xanthene chromophore to bound Tb
3+. The correlation between energy transfer efficiency and ligand structure for three analogous compounds were investigated.
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Tomihiro Nishiyama, Takeshi Seshita, Hiroshi Shodai, Kazushige Aoki, H ...
1996 Volume 25 Issue 7 Pages
549-550
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Homo-coupling reaction of various alkyl, aryl, vinyl, and allyl Grignard reagents with trifluoromethanesulfonic anhydride provides a simple and straightforward method for the syntheses of symmetrical carbon-carbon coupling products under mild conditions and in moderate to good yields.
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Tetsuo Yatabe, Masaki Shimomura, Akira Kaito
1996 Volume 25 Issue 7 Pages
551-552
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Thin film of linear oligosilane, Me(SiMe
2)
12Me, was prepared by a vacuum-deposition method. In the film, the Si-backbones adopted all-
trans conformation and highly oriented perpendicular to the substrate. The oligosilane film showed a sharp UV absorption at 285 nm attributed to the planar-zigzag form.
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Md. Alamgir Hossain, Kazuhiko Ichikawa
1996 Volume 25 Issue 7 Pages
553-554
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The crystal structure of [ClL]
2+·2Cl
−·3CH
3OH, where L = (C
6H
5CH
2)
3N
4((CH
2)
6)
6, shows the complete encapsulation of a chloride anion into the intramolecular cavity of the macrotricyclic cage L
3+. The included anion is held eccentrically into the cavity with a distance of about 4.1 Å from the three charged nitrogen cations and 5.7 Å from the uncharged nitrogen atom.
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Satoshi Kamiguchi, Hideo Imoto, Taro Saito
1996 Volume 25 Issue 7 Pages
555-556
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A dodecanuclear chromium sulfide cluster complex [Cr
12S
16(PEt
3)
10] has been synthesized by the reaction of a hexanuclear cluster complex [Cr
6S
8(PEt
3)
6] with sulfur. This complex has two octahedral Cr
6S
8 cores that are linked by two Cr-S bonds. The intercluster bonding mode is similar to that in the Chevrel phases. Cyclic voltammetry shows the existence of the intercluster electronic interaction between the two Cr
6S
8 cluster units.
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Toshimasa Akagi, Takeko Matsumura-Inoue
1996 Volume 25 Issue 7 Pages
557-558
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The dynamic photochemical response of Ru(bpy)
32+-catalyzed Belousov-Zhabotinsky (B-Z) reaction was studied in a thin layer solution system with a mask. It was found that stable chemical waves are generated from a masked area and their features are dependent on the chemical components. A high [MA]
0 greatly contributes to the photosensitivity of the system. (MA = CH
2(COOH)
2)
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Kei Inumaru, Hitoshi Nakajima, Takeru Ito, Makoto Misono
1996 Volume 25 Issue 7 Pages
559-560
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Microcrystallites of (NH
4)
3PW
12O
40 self-assembled to form symmetric dodecahedral aggregates (ca. 0.5–6 μm in size) in which the microcrystallites joined together with the same crystal orientation, by controlled deposition of NH
4 salts from a heated aqueous solution of H
3PW
12O
40. These aggregates were highly porous, where microcrystallies were connected each other by epitaxial interfaces.
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Toshihiro Miyao, Isao Shishikura, Masakuni Matsuoka, Masatoshi Nagai
1996 Volume 25 Issue 7 Pages
561-562
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The alumina-supported Mo carbide catalyst was synthesized using a chemical vapor deposition (CVD) technique. The CVD carbide exhibited an extremely high activity for the reduction of CO
2, compared to the alumina-impregnated carbide. The XPS and XRD analyses showed the formation of Mo carbide on the alumina. The increase in the BET surface area of the CVD carbide with increasing Mo loading suggested that very fine particles of Mo carbide were formed on the alumina.
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Atsushi Aoki, Tokuji Miyashita
1996 Volume 25 Issue 7 Pages
563-564
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Stable redox polymer monolayer and Langmuir-Blodgett (LB) films can be prepared from amphiphilic copolymers of
N-dodecylacrylamide (DDA) with ferrocene derivative (Fc) and with ruthenium complex (Ru). Electrochemical properties of the LB films fabricated from the hetero-deposition of Ru and Fc copolymer monolayers onto ITO electrodes were investigated using cyclic voltammetry. The results demonstrate that the hetero-deposited redox polymer LB films show rectifying property and charge storage.
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Ichiro Yamanaka, Masanori Soma, Kiyoshi Otsuka
1996 Volume 25 Issue 7 Pages
565-566
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Bis(2,4,-pentanedionate)TiO and TiO
2 enhanced markedly the activity of the EuCl
3-Zn
0-CF
3CO
2H-catalytic system for the CH
4 oxidation to MeOH with O
2 at 40 °C. It is suggested that Ti(II) species generated from Ti(IV) by the reduction with Zn
0 and CF
3CO
2H is responsible for this enhancement.
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Takeshi Kobayashi, Kyota Uheda, Haruo Naruke, Toshihiro Yamase
1996 Volume 25 Issue 7 Pages
567-568
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EuGa
2S
4 and CaGa
2S
4:Ce were prepared by a method of the decomposition of metal dimethyldithiocarbamates which provides a simple and safe technique desired for the phosphor production. UV-irradiation of such EuGa
2S
4 and CaGa
2S
4:Ce (in the Ce / Ca = 1 / 20 ratio) polycrystallines gave green and blue emission with high yield, as exemplified by relative yields of 0.17 and 0.84 against a commercially available Y
2SiO
5:Ce blue phosphor at room temperature respectively.
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Toshihiko Matsuda, Shinsuke Nakamura, Ken-ichiro Ide, Kazuiku Nyudo, S ...
1996 Volume 25 Issue 7 Pages
569-570
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A new electrochemical oscillation is found for reduction reaction of silicon tetrachloride on a partially immersed single crystal n-Si electrode in a lithium chloride-potassium chloride eutectic melt electrolyte. The reduction of SiCl
4, which is almost insoluble in the electrolyte, occurs mainly near the upper edge of an electrolyte meniscus on the electrode, and it is discussed that the oscillation is caused by a change in the height of the meniscus due to a change in the chemical structure (and hence the interfacial tension) of the electrode surface with progress of the silicon deposition reaction.
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Michinori Waki, Koji Waki, Kenji Miyamoto, Akiyoshi Matsumoto, Hirokaz ...
1996 Volume 25 Issue 7 Pages
571-572
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An 18-peptide, T22, has been shown to have a strong anti-human immunodeficiency virus (HIV) activity comparable to that of 3′-azido-3′-deoxy-thymidine (AZT). Several shortened analogs of T22 were designed, synthesized and evaluated of their anti-HIV activities. A 14-peptide analog with one disulfide bond, TW70 (des-Cys
8,13, Tyr
9,12-[
D-Lys
10, Pro
11]-T22), showed comparable activity to that of T22, indicating that the molecular size of T22 could be reduced without loss of the activity.
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Éva Balogh-Hergovich, József Kaizer, Gábor Speier
1996 Volume 25 Issue 7 Pages
573-574
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Primary and secondary nitro compounds are easily transformed to aldehydes of ketones by dioxygen catalyzed by metallic copper.
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Yoshiaki Yasuda, Eiichi Iishi, Hiroshi Inada, Yasuhiko Shirota
1996 Volume 25 Issue 7 Pages
575-576
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A novel class of low-molecular-weight organic gels has been developed;
N,
N′,
N″-tristearyltrimesamide (TSTA) forms gels with various organic solvents, immobilizing solvent at a low concentration of TSTA. The gels, which form fibrous bundles leading to three-dimensional networks, exhibit well-defined sol-gel transitions. Both intermolecular hydrogen bonding and intermolecular inteactions between long alkyl chains are suggested to be responsible for the formation of gels.
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