-
Yasushi Nishihara, Tsuyoshi Kato, Jun-ichi Ando, Atsunori Mori, Tameji ...
2001 Volume 30 Issue 10 Pages
950-951
Published: 2001
Released: April 04, 2003
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Homo-coupling polycondensation of aromatic compounds bearing two (trimethylsilyl)ethynyl groups mediated by copper(I) chloride in DMF gives conjugated poly(arylenebutadiynylene)s in up to 94% yield with molecular weight of 4000–8900 (
Mw/
Mn = 1.78–2.09).
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Masaaki Okazaki, Shin Ohshitanai, Hiromi Tobita, Hiroshi Ogino
2001 Volume 30 Issue 10 Pages
952-953
Published: 2001
Released: April 04, 2003
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Treatment of HSiMe
2Ph with a square-planar rhodium(I) complex Rh[(
κ2-
Si,P)-Me
2SiCH
2CH
2PPh
2](Pme
3)
2 gave rise to selective dehydrogenative coupling of hydrosilanes to afford (SiMe
2Ph)
2 and RhH
2[(
κ2-
Si,P)-Me
2SiCH
2CH
2PPh
2](Pme
3)
2.
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Taizo Hayashida, Yoshitaka Yamaguchi, Karl Kirchner, Hideo Nagashima
2001 Volume 30 Issue 10 Pages
954-955
Published: 2001
Released: April 04, 2003
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The coordinatively unsaturated ruthenium(II) complexes [Ru(
η6-C
6R
6)(
η-amidinate)]
+X
− (R = H, Me, X = TFPB, PF
6), being isoelectronic with Ru(
η5-C
5Me
5)(
η-amidinate), have been isolated and characterized by spectroscopy and crystallography. A weak
π-coordination of the amidinate ligands in the solid state was observed by X-ray crystallography. DFT calculations also suggest that such a coordination mode contributes to the stabilization of these complexes. These complexes behave as highly reactive transition metal Lewis acids in the reactions with various two-electron donor ligands.
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Atsushi Inoue, Junichi Kondo, Hiroshi Shinokubo, Koichiro Oshima
2001 Volume 30 Issue 10 Pages
956-957
Published: 2001
Released: April 04, 2003
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Lithium trimethylmagnesate (Me
3MgLi) induces monomethylation of dibromodisilylmethanes in excellent yields. Subsequent dehydrobromination of the resulting 1-bromo-1,1-disilylethanes with DBU affords 1,1-disilylethenes in good yields.
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Katsukiyo Miura, Tatsuyuki Takahashi, Hisashi Nishikori, Akira Hosomi
2001 Volume 30 Issue 10 Pages
958-959
Published: 2001
Released: April 04, 2003
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In the presence of a catalytic amount of TsOH·H
2O, hemiacetals derived from (
Z)-4-trialkylsilyl-3-buten-1-ols and chloral were cyclized to 2-trichloromethyl-4-trialkylsilylmethyl-1,3-dioxanes in good to high yields. The substrates bearing an allylic substituent achieved high levels of 1,2-asymmetric induction. When the silyl group was a benzyldimethylsilyl group, the products could be efficiently converted to 1,2,4-triol derivatives by oxidative cleavage of the silicon–carbon bond.
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Makoto Minato, Ryo Hirabayashi, Takaomi Matsumoto, Yoshitaka Yamaguchi ...
2001 Volume 30 Issue 10 Pages
960-961
Published: 2001
Released: April 04, 2003
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The reaction of [MoH
4(Ph
2PCH
2CH
2PPh
2)
2] with PhGeH
3 or Ph
2GeH
2 resulted in the formation of a novel molybdenum–germyl complex [MoH
3{[Ph
2PCH
2CH
2P(Ph)C
6H
4-
o]
2(Ph)Ge
-P,P,P,P,Ge}] (
4) with a quinquidentate ligand comprised of a P∼P∼Ge∼P∼P framework, where activation of Ge–H bonds, two C–H bonds, and, in the case of Ph
2GeH
2, a Ge–C bond took place concurrently.
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Makoto Tanabe, Kohtaro Osakada
2001 Volume 30 Issue 10 Pages
962-963
Published: 2001
Released: April 04, 2003
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Pt{SiH(C
6H
4F-4)
2}
2(Pme
3)
2 reacts with Rh (I) complexes to afford new Rh–Pt heterobimetallic complexes with bridging hydrido and diarylsilyl ligands. These complexes were characterized by X-ray crystallography. The NMR spectra exhibit dynamic behavior of hydrogen atoms and three Pme
3 ligands bonded to Rh center in solution.
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Tsuyoshi Matsumoto, Kazuyuki Tatsumi
2001 Volume 30 Issue 10 Pages
964-965
Published: 2001
Released: April 04, 2003
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The germanedithiols Dmp(Ar)Ge(SH)
2 [Dmp=2,6-dimesitylphenyl; Ar = Dep (2,6-diethylphenyl)
1a, Tip (2,4,6-triisopropylphenyl)
1b] were synthesized by the reduction of hexathiagermepanes Dmp(Ar)GeS
6 and tetrathiagermolanes Dmp(Ar)GeS
4 with NaBH
4. The treatment of
1awith 2 equiv of potassium hydride afforded the dipotassium germanedithiolate
2.
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Nozomi Takagi, Shigeru Nagase
2001 Volume 30 Issue 10 Pages
966-967
Published: 2001
Released: April 04, 2003
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In search of a stable disilyne, effects of bulky 2,6-bis(2,4,6-triisopropylphenyl)phenyl (Ar*) groups on silicon–silicon triple bonding are investigated using density functional theory. It is predicted that Ar*Si≡SiAr* is very stable to isomerization and dimerization.
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Osamu Niyomura, Kiyotaka Sakai, Toshiaki Murai, Shinzi Kato, Shigehiro ...
2001 Volume 30 Issue 10 Pages
968-969
Published: 2001
Released: April 04, 2003
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The reaction of
S-2-(trimethylsilyl)ethyl selenothioates with KF, CsF, and RbF gave the corresponding alkali metal selenothioates in moderate to good yields. The use of 18-crown-6 ether gave the products in higher yields. The molecular structure analyses of some of metal salts were carried out.
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Yosuke Nakamura, Takahiro Fujii, Jun Nishimura
2001 Volume 30 Issue 10 Pages
970-971
Published: 2001
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Novel
anti-[2.3](3,10)phenanthrenophane
3, prepared by the intramolecular [2 + 2] photocycloaddition of 1,3-bis(3-vinyl-10-phenanthryl)propane, exhibited monomer fluorescence. This is in a remarkable contrast with the excimer fluorescence emission from
anti-[2.3](3,9)phenanthrenophane
2 with slightly larger overlap between phenanthrene rings than in
anti-
3.
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Fumiyuki Ozawa, Shogo Yamamoto, Seiji Kawagishi, Masatomi Hiraoka, Shi ...
2001 Volume 30 Issue 10 Pages
972-973
Published: 2001
Released: April 04, 2003
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Methylplatinum triflate coordinated with 1,2-diphenyl-3,4-bis[(2,4,6-tri-
t-butylphenyl)phosphinidene]cyclobutene serves as a highly selective catalyst for dehydrogenative silylation of ketones with HSiMe
2Ph in the presence of pyridine as a co-catalyst, giving silyl enol ethers in high yields.
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Aihong Han, Takatsugu Wakahara, Yutaka Maeda, Yasuyuki Niino, Takeshi ...
2001 Volume 30 Issue 10 Pages
974-975
Published: 2001
Released: April 04, 2003
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The photochemical cycloaddition of C
78(
C2v+
D3) with disilirane
1 only gave the adducts of C
78(
C2v). The
D3 isomer of C
78 did give no adduct with
1. The two mono-adducts were firstly isolated by a multi-stage HPLC, and characterized on the basis of the spectroscopic data. The electrochemical properties were also investigated by means of differential pulse voltammetry.
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Jin Wook Han, Tamio Hayashi
2001 Volume 30 Issue 10 Pages
976-977
Published: 2001
Released: April 04, 2003
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A new MOP ligand containing
n-octyl group at 6 and 6′ positions of (
R)-2-(diphenylphosphino)-2′-aryl-1,1′-binaphthyl skeleton was prepared and used for palladium-catalyzed asymmetric hydrosilylation of cyclic 1,3-dienes with trichlorosilane. By introduction of the
n-octyl group, the palladium-phosphine catalyst became soluble in the reaction system, realizing high catalytic activity at a low reaction temperature.
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Kei Ohkubo, Tomoyoshi Suenobu, Hiroshi Imahori, Akihiro Orita, Junzo O ...
2001 Volume 30 Issue 10 Pages
978-979
Published: 2001
Released: April 04, 2003
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The
g-values of ESR spectra of superoxide (O
2•−) complexes with various organotin compounds acting as Lewis acids were determined in acetonitrile at 143 K. The binding energies (Δ
E) in the complexes between organotins and O
2•− have been evaluated from deviation of the
gzz-values from the free spin value. The Δ
E values are well correlated with the catalytic reactivity of organotins as well as a series of metal ions acting as Lewis acids to promote electron transfer from cobalt(II) tetraphenylporphyrin to O
2, which would not occur in the absence of Lewis acids under otherwise the same experimental conditions.
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Yoshiaki Sugihara, Yui Aoyama, Juzo Nakayama
2001 Volume 30 Issue 10 Pages
980-981
Published: 2001
Released: April 04, 2003
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Methylations of bibenzonorbornenylidene episulfides
5 and
6 by Me
3O
+BF
4− at −18 °C furnished the corresponding episulfonium salts
7 and
8, respectively, with retention of the configuration of the episulfides, whereas those at room temperature or above produced a mixture of
7 and
8 in the ratio of about 1:4. Dynamic
1H NMR investigation in the temperature range 25–40 °C allowed the determination of the activation parameters of the isomerization between
7 and
8, which obeyed first-order kinetics.
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Naoki Asao, Kazuyuki Nabatame, Yoshinori Yamamoto
2001 Volume 30 Issue 10 Pages
982-983
Published: 2001
Released: April 04, 2003
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Intermolecular vinylsilylation of the alkynes
1b–
c, having an alkoxy group at the homopropargylic position, with the vinylsilane
2 proceeded in the presence of AlBr
3 to give the corresponding dienylsilanes
3b–
c in moderate to good yields. In contrast, no product was obtained in the reaction of 1-octyne. The AlBr
3 mediated vinylsilylation of the phenylacetylene
9c, bearing methoxy group at the
ortho position, also proceeded in good yield.
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Hiroyuki Ishihara, Yoshio N. Ito, Tsutomu Katsuki
2001 Volume 30 Issue 10 Pages
984-985
Published: 2001
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Racemic 3-cyclohexyl-1-methyldiaziridine was found to react with
α,β-unsaturated amides in basic conditions, giving
N-unprotected
trans-aziridines, while 3,3-pentamethylenediaziridine had been reported to afford
cis-aziridines in high diastereoselectivity. The
trans-selectivity was partially dependent on the stereochemistry of the substrate. The stereochemistries of these reactions were reasonably explained by the conformational analysis of the intermediary enolates.
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Kazuya Uenishi, Ichiro Imae, Eiji Shirakawa, Yusuke Kawakami
2001 Volume 30 Issue 10 Pages
986-987
Published: 2001
Released: April 04, 2003
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Ring opening of 1-methyl-1-(1-naphthyl)-2,3-benzosilacyclobut-2-ene by carbanion and silyl anion was found to proceed regioselectively.
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Masakazu Ohkita, Takanori Suzuki, Keitaro Nakatani, Takashi Tsuji
2001 Volume 30 Issue 10 Pages
988-989
Published: 2001
Released: April 04, 2003
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The crystallization of 2,6-diethynylpyridine
1 leads to C(sp
2)–H···N hydrogen bonded head-to-tail tapes which are held together by C(sp)–H···π hydrogen bridges to form 2D polar sheets; further assembly through π–π stacking interaction results in 3D polar crystals which show intense powder SHG response, 5-fold stronger than crystalline urea.
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He Tian, Bingzhi Chen, Pei-Hua Liu
2001 Volume 30 Issue 10 Pages
990-991
Published: 2001
Released: April 04, 2003
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A novel photochromic amorphous molecule (Spiro-BTE) based on bisthienylethene with a spirobifluorene linker has been synthesized. The relative high photochromic quantum yields were obtained for the Spiro-BTE and the switching stability was observed for more than 200 photochromic cycles. The introduction of the spiro center for photochromic molecules provides a new guideline for the exploring new amorphous photochromic materials with high
Tg, good photostability.
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Toma Fujita, Ceco Dushkin, Masayoshi Nawa, Seiichiro Nakabayashi
2001 Volume 30 Issue 10 Pages
992-993
Published: 2001
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The magnetic force is applied for the precisely controlled levitation of salt-containing water droplets in oil phase. This levitation phenomena analyses were achieved by the analytical calculation of the inhomogeneous space distribution of the field and force in the bore of a vertical superconducting magnet. The tiny effects on the droplet position are explained as variation of the diamagnetic susceptibility in the course of levitation.
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Takashi Karatsu, Toshifumi Shibata, Atsuko Nishigaki, Keijiro Fukui, A ...
2001 Volume 30 Issue 10 Pages
994-995
Published: 2001
Released: April 04, 2003
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The π–π and σ–π interactions in
α,ω-di-1-naphthyl and -di-9-anthryl oligosilanes [Np–(SiMe
2)
n–Np (
1–4), Ant–(SiMe
2)
n–Ant (
5–8), n = 1–4] were investigated in solution. In nonpolar solvents such as cyclohexane, a strong excimer fluorescence is observed, which indicates a strong π–π interaction. In a polar solvent (CH
3CN), a charge-transfer (CT) emission is observed for
3 and
4 due to the σ–π interaction.
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Yukie Mori, Takeshi Kasai, Toru Takesada, Hiroaki Komatsu, Hiroshi Yam ...
2001 Volume 30 Issue 10 Pages
996-997
Published: 2001
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The reaction of 6,6′-diethynylbiferrocene (
1) with
cis-PtCl
2(PR
3) (R=
nBu and Me) or (η
5-C
5H
5)Co(PR
3)
2 gave novel cyclic mixed metal complexes, which show a rich oxidative electrochemistry.
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Hiroaki Komatsu, Yasunobu Suzuki, Hiroshi Yamazaki
2001 Volume 30 Issue 10 Pages
998-999
Published: 2001
Released: April 04, 2003
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The reactions of bulky terminal alkynes, RC≡CH [R=
tBu,
1a; Me
3Si,
1b; (cod)Rh(η
5-Me
2C
5H
2),
1c] with [RhCl(cod)]
2 in the presence of Et
3N have been found to provide novel hydropentalenylrhodium complexes,
(cod)Rh(η
5-R
4C
8H
3) (
2,
4 and
5). The structures have been determined by a single-crystal X-ray diffraction analysis. A mechanism involving the migration of an α-
tert-butyl group or an α-hydrogen atom of the metal–vinyl intermediates is proposed.
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Jing-hui Zeng, Yu Zhu, Jian Yang, Yuan-fang Liu, Yi-Tai Qian
2001 Volume 30 Issue 10 Pages
1000-1001
Published: 2001
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A novel hydrothermal method has been developed for the synthesis of rod-shaped PbS/poly(vinyl acetate) composites. These one-dimensional (1-D) PbS/polymer composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), and Raman spectroscopy. The results show that the products are of rod-shaped core/sheath structure with good crystallinity.
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Takashi Shibahara, Kasumi Nishiura, Masanobu Tsuboi, Haruo Akashi, Gen ...
2001 Volume 30 Issue 10 Pages
1002-1003
Published: 2001
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Novel photochromic and non-photochromic ethylene-1,2- dithiolato dinuclear tungsten complexes, [W
2(µ-S
2)(µ-S
2C
2Ph
2)
2(S
2C
2Ph
2)
2] (
2a) and [W
2(µ-S
2)
2(µ-S
4)(S
2C
2Ph
2)
2] (
2b), respectively, were synthesized and characterized.
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Yunyin Niu, Yuxiao Wang, Yinglin Song, Shixiong Liu, Hegen Zheng, Xinq ...
2001 Volume 30 Issue 10 Pages
1004-1005
Published: 2001
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Reaction of
n-Bu
2SnCl
2 with K[Ph
2P(S)NP(S)Ph
2] in CH
3CN gives the spirobimetallocyclic complex bis(tetraphenyldithioimidodiphosphinato)dibutyltin (IV), {
n-Bu
2Sn[Ph
2P(S)NP(S)Ph
2]
2} in which π–π stacking interactions by the phenyl rings of the ligands exist. The nonlinear optical (NLO) properties were studied with an 8 ns-pulsed laser at 532 nm. Its optical responses to the incident light exhibit strong refractive effect with
n2 = 5.4 × 10
−18 m
2 W
−1 in a 1.2 × 10
−4 mol dm
−3 DMF solution.
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Yasuro Kawano, Hiroyuki Kawakami, Mamoru Shimoi
2001 Volume 30 Issue 10 Pages
1006-1007
Published: 2001
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The reaction of [(η
6-C
6Me
6)RuCl
2]
2 with excess BH
3·THF produced a ruthenaborane cluster,
arachno-[(η
6-C
6Me
6)RuB
4H
10] (
1). Compound
1 underwent cluster degradation through the action of Pme
3 to afford
arachno-[(η
6-C
6Me
6)Ru(Pme
3)B
3H
7] (
2).
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Yuan Jiang Pan, Zhi Min Jin, Cui Rong Sun, Chong Wen Jiang
2001 Volume 30 Issue 10 Pages
1008-1009
Published: 2001
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X-ray diffraction study on 2,6-dimethylpyridinium hydrogen fumarate reveals that the same site of O
−(sp
3) is confined by hydrogen bonds not only of N
+–H···O
−, but also those of C(sp
3)–H···O and C(sp
2)–H···O.
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Shigenori Matsushima, Takumi Tanizaki, Hiroyuki Nakamura, Moriyasu Non ...
2001 Volume 30 Issue 10 Pages
1010-1011
Published: 2001
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The electronic structure of ZnSb
2O
6 is calculated by using the FLAPW method and the DV-Xα method. The valence band with the width of ca. 10.5 eV is roughly classified into the two bands, where O 2p orbitals are dominant and hybridize with Zn 3d and Sb 5s orbitals. On the other hand, the lower conduction band is mainly constructed from Sb 5s orbitals which have large spatial extent. Therefore, ZnSb
2O
6 crystal is expected to have large electron mobility with doping carriers.
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Kiyoshi Tanemura, Tsuneo Suzuki, Yoko Nishida, Koko Satsumabayashi, Ta ...
2001 Volume 30 Issue 10 Pages
1012-1013
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The reactions of 2-methoxyethoxymethyl (MEM) ethers
1 with a catalytic amount of cerium(IV) ammonium nitrate (CAN) in acetic anhydride gave the corresponding mixed acetal esters
2 and acetates
3.
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Takuo Mizutani, Masashi Ikegami, Ritsuko Nagahata, Tatsuo Arai
2001 Volume 30 Issue 10 Pages
1014-1015
Published: 2001
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Highly branched stilbene dendrimers underwent
trans–cis isomerization in the excited singlet state within the lifetime of 10 ns.
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Yoshihito Kayaki, Tomoyuki Suzuki, Takao Ikariya
2001 Volume 30 Issue 10 Pages
1016-1017
Published: 2001
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A water-soluble ruthenium(II) complex bearing tris(hydroxymethyl)phosphine, RuCl
2[PH(CH
2OH)
2]
2[P(CH
2OH)
3]
2, is highly effective for the catalytic hydrogenation of supercritical carbon dioxide (scCO
2) under scCO
2–H
2O multi-phasic conditions.
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Kazu Okumura, Tetsuji Kusakabe, Naoko Yasunobu, Miki Niwa
2001 Volume 30 Issue 10 Pages
1018-1019
Published: 2001
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The Pd/WO
3/ZrO
2 catalyst exhibited activity for the NO–CH
4–O
2 reaction in the presence of water vapor when WO
3 monolayer covered the ZrO
2 surface. The selectivity of methane consumption for NO reduction was considerably improved by the addition of 10% of water vapor.
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Yoshio Furusho, Takeshi Maeda, Takeshi Takeuchi, Nobuaki Makino, Toshi ...
2001 Volume 30 Issue 10 Pages
1020-1021
Published: 2001
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A rational design of helical molecules is presented. Fusing chiral binaphthyl units and metallosalen complexes resulted in formation of molecules which inevitably adopt certain helical conformations.
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Takashi Yamada, Reiko Azumi, Hiroaki Tachibana, Hideki Sakai, Masahiko ...
2001 Volume 30 Issue 10 Pages
1022-1023
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Thermal behaviors of
α-disubstituted oligothiophenes were investigated. 5,5″-Dicyanoterthiophene having thiophene rings as the rigid core exhibited a nematic liquid crystalline phase at 205 °C on cooling. It should be emphasized that this molecule lacks in a flexible substituent such as a long alkyl chain.
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Ioan Balint, Akane Miyazaki, Ken-ichi Aika
2001 Volume 30 Issue 10 Pages
1024-1025
Published: 2001
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Platinum nanocrystals, having mainly (100) structure, have been prepared by a colloid method and then supported on
γ-Al
2O
3. The catalytic test of Pt(100)/Al
2O
3 for the NO/CH
4 reaction showed that the formation of NH
3 and CO side products was prevented in contrast to the conventional Pt/
γ-Al
2O
3 catalyst that gives relatively high selectivity to NH
3 and CO.
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Jun Kawamata, Masaharu Akiba, Yoshio Inagaki
2001 Volume 30 Issue 10 Pages
1026-1027
Published: 2001
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N,N-Diphenyl-8-[2-(4-pyridyl)ethenyl]dibenzofuran-2-ylamine (
1) has been synthesized and its second-order nonlinear optical coefficient has been examined by means of Second Harmonic Wave Generated with the Evanescent Wave (SHEW) method. As a result,
1 has been found to exhibit an effective
d coefficient 3.0 times as large as that of urea. The cutoff wavelength of the compound was estimated to be 370 nm.
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Youichi Shimizu, Tomoyasu Yano
2001 Volume 30 Issue 10 Pages
1028-1029
Published: 2001
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Ni
3S
4, CoNi
2S
4, and NiCo
2S
4 thiospinels were synthesized by a pH-controlled homogeneous precipitation method at 70 °C with metal-chlorides and thioacetamide in the ammonium chloride–ammonia buffer solutions adjusted to pH = 9.9.
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Xiuli Wang, Enbo Wang, Changwen Hu
2001 Volume 30 Issue 10 Pages
1030-1031
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The hybrid inorganic–organic electroactive material containing 12-molybdophosphate was synthesized and firstly used as a bulk-modifier to fabricate a chemically modified carbon paste electrode (CPE). The hybrid material bulk-modified CPE (HM-CPE) exhibits stable electrochemical behavior and good electrocatalytic activity. The remarkable advantage of the HM-CPE is its excellent reproducibility of surface renewal.
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Fanglin Chen, Changrong Xia, Meilin Liu
2001 Volume 30 Issue 10 Pages
1032-1033
Published: 2001
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Ordered macroporous Sr
0.5Sm
0.5CoO
3 structrures with an average pore size of 140 nm have been prepared using close-packed arrangement of monodispersed polystyrene spheres as templates. A fuel cell using ordered macroporous Sr
0.5Sm
0.5CoO
3 as the cathode, gadolinia-doped ceria (GDC) film as the electrolyte, and GDC–NiO as the anode generated maximum power densities of 150, 196 and 267 mW/cm
2 at 500, 550 and 600 °C, respectively.
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Shinji Yamada, Chisako Morita
2001 Volume 30 Issue 10 Pages
1034-1035
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Chiral 1,4-dihydroquinolines were synthesized by the addition of ketene silyl acetals to quinolinium salts. The stereoselectivity was associated with the intramolecular interaction between the quinolinium and the carbonyl or thiocarbonyl groups, which was revealed by
1H NMR spectroscopy and X-ray analysis.
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Qi Feng, Yaohua Xu, Koji Kajiyoshi, Kazumichi Yanagisawa
2001 Volume 30 Issue 10 Pages
1036-1037
Published: 2001
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A layered lithium nickel manganese oxide, Li
1Ni
1/3Mn
2/3O
2, has been hydrothermally prepared from a sandwich nickel manganese hydroxide–oxide precursor, Ni
7Mn
14O
27(OH)
10·nH
2O, which has been hydrothermally synthesized at 200 °C by intercalating Ni(OH)
2 into layered birnessite. In this precursor, MnO
2 layer and Ni(OH)
2 layer alternately pack together to form sandwich-like layered structure. The compounds were characterized by XRD and IR spectrum.
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Yujie Xiong, Yi Xie, Guoan Du, Xianming Liu, Xiaobo Tian
2001 Volume 30 Issue 10 Pages
1038-1039
Published: 2001
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Single-crystalline InSb dendrites were prepared by a sonochemical coreduction route. The result of supplementary experiments shows the experiment was carried out along the coreduction mechanism. It is found that the ultrasonic power, reaction temperature and solvent played crucial roles in the crystallinity and yield of products.
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Motoki Uehara, Takahiko Sasaki
2001 Volume 30 Issue 10 Pages
1040-1041
Published: 2001
Released: April 04, 2003
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The hydration reaction of Ca A-type zeolite and calcium hydroxide was studied. The results revealed that an isostructural material of hydrocalumite (C-A-H) is generated at the early stage of hydration, and following that of strätlingite–vertumnite is generated. Only 0.77 nm of the C-A-H phase was observed at a humidity below 40% while part of the 0.77 nm phase swelled to 0.82 nm at a humidity of 40% or above.
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Dongshe Zhang, Seigo Ito, Yuji Wada, Takayuki Kitamura, Shozo Yanagida
2001 Volume 30 Issue 10 Pages
1042-1043
Published: 2001
Released: April 04, 2003
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A water-medium screen printing technique was developed for making mesoporous TiO
2 electrodes by using two types of commercial nanocrystalline TiO
2 powders and three types of water-soluble cellulosic thickeners. Treatment of the electrodes with a TiCl
4 aqueous solution improved the overall conversion efficiency of the dye-sensitized solar cells based on these mesoporous TiO
2 electrodes.
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Won Bae Kim, Jae Sung Lee
2001 Volume 30 Issue 10 Pages
1044-1045
Published: 2001
Released: April 04, 2003
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The reactive polycarbonate precursors of phenyl carbonate-ended oligomers amenable to polycondensation in the phosgene-free polycarbonate process were catalytically synthesized via a novel one-step reaction of the coupled oxidative carbonylation of bisphenol-A and phenol with carbon monoxide.
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Kazumasa Okada, Shuichiro Tanimoto, Toshio Ibuki, Ko Saito, Tatsuo Gej ...
2001 Volume 30 Issue 10 Pages
1046-1047
Published: 2001
Released: April 04, 2003
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Assignment of the total C photoabsorption spectrum of CF
3CN in the K-shell region has been established with the help of an angle-resolved photofragment ion spectroscopy. The anisotropy parameters for the energetic CF
3+ and CN
+ fragments were evaluated at the selected photon energies. The linear C–C≡N skeleton basically held in this region since the strongly negative anisotropy parameters were obtained at the π
CN* ← C
F(1s) transition.
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Hyun-Seog Roh, Ki-Won Jun, Seung-Chan Baek, Sang-Eon Park
2001 Volume 30 Issue 10 Pages
1048-1049
Published: 2001
Released: April 04, 2003
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CeO
2 exhibits extraordinary catalytic activity in partial oxidation of methane to synthesis gas. Total combustion was observed at stoichiometric feed ratio, while oscillatory partial oxidation was achieved at O
2 deficient feed ratio.
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