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Noriyuki Iwadate, Michinori Suginome
2010 Volume 39 Issue 6 Pages
558-560
Published: June 05, 2010
Released on J-STAGE: April 24, 2010
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Supplementary material
Styrene derivatives underwent dehydroborylation with naphthalene-1,8-diaminatoborane [(dan)BH] in the presence of a cationic rhodium complex, giving β-borylstyrene derivatives in good yields. Thus prepared β-borylstyrenes bearing a chlorine or B(pin) group on their aromatic rings were utilized for the synthesis of highly conjugated molecules through stepwise cross-coupling, taking advantage of the dan group as an effective protective group for a boronyl group.
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Seiichiro Koda, Yoshiko Miura, Akira Endo, Hiroshi Uchida, Kiyoshi Ita ...
2010 Volume 39 Issue 6 Pages
561-563
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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We irradiated a glassy carbon electrode in AgNO
3 solution using a 532 nm pulsed laser to prepare a silver-activated electrode. The UV–visible spectrum of the solution evidenced the production of Ag particles, and transmission electron microscopic images showed the formation of carbon–silver composite on the solid carbon surface. The reduction potential of O
2 measured with the prepared electrode by differential pulse voltammetry shifted positively by 0.05 V in NaClO
4 solution, which indicated that the present irradiation procedure effectively activated the glassy carbon electrode.
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Hirofumi Sato, Yoshitomo Suzuki, Yoshio Takai, Hideya Kawasaki, Ryuich ...
2010 Volume 39 Issue 6 Pages
564-566
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Supplementary material
The heterochirality of a 1:2 metal/Ph-pybox complex ion was encyclopedically evaluated by ESIMS using pseudo-racemic (
R,
R)- and (
S,
S)-Ph-pybox pair, which were unlabeled/labeled by deuterium atoms, respectively. The heterochiral complex was predominantly formed in all investigated 1:2 metal/Ph-pybox complex ions.
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Kana Sadaoka, Yuki Hirai, Shigenori Kashimura, Yoshitaka Saga
2010 Volume 39 Issue 6 Pages
567-569
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Reduction of formyl groups in natural chlorophyll (Chl)
d purified from a cyanobacterium,
Acaryochloris marina, and its demetalation product, pheophytin (Phe)
d, was kinetically analyzed. Chl
d exhibited slower reduction kinetics of the formyl group to the hydroxymethyl group by
tert-butylamine borane complex than Phe
d.
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Dao Yu, Qingfeng Liu, Qian Liu
2010 Volume 39 Issue 6 Pages
570-571
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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A novel protein gel method was developed to synthesize composite oxide phosphors, in which ovalbumin was used as gelling agent. By this route, Lu
3Al
5O
12:Ce
3+ powders were obtained at 700 °C with a size of less than 50 nm. Under ultraviolet excitation, the emission peak is located around 510 nm. This simple method is applicable to high-throughput synthesis.
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Takashi Inagaki, Tomoyuki Mochida
2010 Volume 39 Issue 6 Pages
572-573
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Supplementary material
Ionic liquids have been prepared from simple metallocenium cations and bis(trifluoromethanesulfonyl)amide anion (TFSA). Their properties were tunable by the choice of metals and substituents; the ferrocenium salts were deep-blue paramagnetic liquids, which are readily prepared by a one-step solventless reaction, and the cobaltocenium salts were orange diamagnetic liquids.
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Satoshi Kikuchi, Tatsuyuki Tsubo, Tomoko Ashizawa, Tohru Yamada
2010 Volume 39 Issue 6 Pages
574-575
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Supplementary material
We here report the effect of microwave irradiation on the
atropo-enantioselective ring-opening reaction of biaryl lactones with dynamic–kinetic resolution catalyzed by AgBF
4–phosphine complexes. The multimode microwave reactor with a cooling system was employed and the fiber-optic sensor was used for measurement of the accurate internal reaction temperature. It was found that the reaction was accelerated by microwave irradiation without any loss of enantioselectivity at almost the same internal temperature as the conventional conditions.
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Sayaka Osada, Kazuki Igarashi, Takashi Nogami, Takayuki Ishida
2010 Volume 39 Issue 6 Pages
576-577
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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NN–CH
2-substituted
L-alanine methyl ester (NNCH
2–
L-Ala–OMe) and β-alanine ethyl ester (NNCH
2–β-Ala–OEt) were prepared, where NN stands for 4,4,5,5-tetramethylimidazolin-1-oxyl 3-oxide. Their nickel(II) perchlorate complexes with a metal/ligand ratio of 1/2 were structurally and magnetically characterized.
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Ryo Kanzaki, Xuedan Song, Yasuhiro Umebayashi, Shin-ichi Ishiguro
2010 Volume 39 Issue 6 Pages
578-579
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Ethylammonium nitrate (EAN) is a typical protic ionic liquid (PIL) known for a long time. In order to investigate acid–base reaction mechanisms in PIL, thermodynamic quantities of a reaction, which corresponds to autoprotolysis in amphoteric solvents, has been determined in neat EAN. Unlike H
3O
+ and OH
− in water, proton donor and acceptor species in EAN are both neutral; this makes acid–base reaction mechanisms in EAN distinct from that in water. EAN–water mixtures have also been studied.
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Chan Yao, Chun-Guang Liu, Li-Kai Yan, Wei Guan, Ping Song, Zhong-Min S ...
2010 Volume 39 Issue 6 Pages
580-581
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Supplementary material
The present study focuses on probing the extent to which nonlinear optical effects act as a guide to protonation sites of α-Keggin heteropolyanions [SiW
12O
40]
4− and [SiV
3W
9O
40]
7−. The second-harmonic generation (SHG) values of differently protonated forms predict that the molecular nonlinear optical activity has a close relationship with protonation sites and provides a new potential experimental probe.
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Long Yang, Fang Gao, Jian Liu, Xiaolin Zhong, Hongru Li, Shengtao Zhan ...
2010 Volume 39 Issue 6 Pages
582-583
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Supplementary material
Pure cooperative branch effects on one- and two-photon optical properties of conjugated derivatives are presented. AM1 calculations demonstrate that the electron density distribution of the frontier orbital and the dipole moment changes of the derivatives are related to the number of branches. The theoretical results show that not only the energy level of the frontier orbital could be mediated by the number of branches, but the HOMO–LUMO gap could be regulated.
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Jingjing Liu, Dian Liu, Sasidharan Manickam, Yuuichi Yokoyama, Shin-ic ...
2010 Volume 39 Issue 6 Pages
584-585
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Supplementary material
A micelle of poly{styrene-
b-[3-(methacryloylamino)propyl]trimethylammonium chloride-
b-ethylene oxide} with
core–
shell–
corona architecture in aqueous solutions has been successfully applied to the synthesis of hollow silica nanospheres as a new template. Tetramethoxysilane, phenyltrimethoxysilane, and their mixtures were used as silica precursors and the ratio of the precursor to the template influences the shell thickness of the obtained hollow silica.
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Kunihiro Ichimura, Akira Funabiki, Ken’ichi Aoki
2010 Volume 39 Issue 6 Pages
586-587
Published: June 05, 2010
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The dry bead milling of solvatochromic E
T30 with silica nanoparticles gave powdery nanohybrids, which exhibited color changes depending on environmental conditions.
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Fazhi Zhang, Yaru Xie, Sailong Xu, Xiaofei Zhao, Xiaodong Lei
2010 Volume 39 Issue 6 Pages
588-590
Published: June 05, 2010
Released on J-STAGE: May 08, 2010
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Supplementary material
Macroporous CoFe
2O
4 spinel microspheres have been fabricated by a simple process involving calcination of layered double hydroxide microsphere precursor, which was originally prepared by spray drying with polystyrene as template.
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Nobuo Iyi, Hirohisa Yamada
2010 Volume 39 Issue 6 Pages
591-593
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Supplementary material
By carrying out decarbonation of CO
32−-type MgAl-LDH (layered double hydroxide) using an acetate-buffer/salt solution under N
2 flow, CO
32−LDH was successfully converted into ClO
4− and NO
3−LDHs, which contain only a little residual CO
32−, in one step under mild conditions. Due to the superior anion-exchangeability, they serve as suitable intermediates for the preparation of LDH hybrids.
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Yuka Yazaki, Masayuki Suda, Naoto Kameyama, Yasuaki Einaga
2010 Volume 39 Issue 6 Pages
594-595
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Supplementary material
We show experimentally that room-temperature ferromagnetism can be induced in ZnO/ZnS core/shell nanoparticles without any magnetic components. This ferromagnetism could be attributed to p–p coupling interactions between S 3p and O 2p electrons arising from the redistribution of charges between Zn and O or S atoms. Our present findings possibly open up a new way for introducing magnetism in semiconductor-based “spintronics” devices.
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Norihito Maru, Osamu Ohno, Kaoru Yamada, Daisuke Uemura
2010 Volume 39 Issue 6 Pages
596-597
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Dinohydrazides A (
1) and B (
2), novel naturally-occurring dibenzoylhydrazines, were isolated from a symbiotic marine dinoflagellate of Okinawan sponge. Their structures were determined by spectroscopic analyses and synthetic methods. They moderately inhibited the growth of mammalian cells.
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Junta Fuchiwaki, Shin-ichi Nishikiori
2010 Volume 39 Issue 6 Pages
598-600
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Supplementary material
A new cyano-bridged Cu(I)/Cd(II) coordination polymer K[CdCu
2(CN)
5]·dce·3H
2O (dce = 1,2-dicyanoethane) containing a novel asymmetric dinuclear Cu(I) building unit [Cu
2(CN)
5]
3− was synthesized, and its emission intensity was very weak in contrast to very strong emission of CdCu(CN)
3·hpn·2H
2O (hpn = 3-hydroxypropionitrile) containing an already known symmetric building unit [Cu
2(CN)
6]
4−.
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Yuji Hashimoto, Kiyoshi Tsuge, Takumi Konno
2010 Volume 39 Issue 6 Pages
601-603
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Supplementary material
A digold(I) complex, [Au
2(
D-Hpen-
S)
2(dppm)] ([
1]), newly prepared from [Au
2Cl
2(dppm)] and
D-H
2pen, readily reacted with Ni
2+ to give a S-bridged Ni
IIAu
I2 trinuclear complex having an 8-membered chelating metalloring, [Au
2(dppm){Ni(
D-pen-
N,
O,
S)
2}] ([
2]). Complex [
2] was reversibly converted to a Ni
IIAu
I3 tetranuclear complex having a 12-membered metalloring, [Au
3(dppm)
2{Ni(
D-pen-
N,
O,
S)
2}]Cl ([
3]Cl), retaining the coordination environment about a Ni
II center.
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Sun Woog Kim, Kazuya Jyoko, Toshiyuki Masui, Nobuhito Imanaka
2010 Volume 39 Issue 6 Pages
604-606
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Red-emitting phosphors, (La
1−xCa
x)OCl:
y%Eu
3+ (0 ≤
x ≤ 0.17, 1 ≤
y ≤ 5), were synthesized in a single-phase form by a liquid-phase method and photoluminescence properties were characterized. The excitation peak intensity of the phosphor was increased with Ca
2+ doping into the LaOCl lattice, corresponding to the successful enhancement of the emission intensity. The maximum emission intensity was obtained for (La
1−xCa
x)OCl:
y%Eu
3+, where it was 63% of that of a commercial Y
2O
3:Eu
3+ phosphor.
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Takashi Ishizu, Takashi Sato, Hiroyuki Tsutsumi, Hideji Yamamoto
2010 Volume 39 Issue 6 Pages
607-609
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Stereochemical structures of a 1:1 complex of (−)-epicatechin (EC) and caffeine, and a 2:4 complex of (−)-epicatechin gallate (ECg) and caffeine were determined by X-ray crystallographic analysis, and noncovalent interactions forming between EC, ECg and caffeine moieties were also elucidate.
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Yong-Tae Kim
2010 Volume 39 Issue 6 Pages
610-611
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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In this study, we suggest a unique approach with which it is possible to enhance the capacity and cycle performance of composite anode materials for lithium ion batteries. We introduced surface thiol groups onto mesocarbon microbeads (MCMB), and these functional groups efficiently obstructed the agglomeration between Sn nanoparticles in the composite formation. This resulted in the high dispersion of Sn nanoparticles with very small size. Half-cell tests showed that highly dispersed Sn nanoparticles enabled us to enhance the capacity by improvement of mechanical stress tolerance in the charge/discharge process.
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Tomohiro Agou, Hiroki Arai, Takayuki Kawashima
2010 Volume 39 Issue 6 Pages
612-613
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Supplementary material
A 1,4-azaborine derivative fused by two naphthalene rings, a dinaphthoazaborine was synthesized, and its molecular structure was revealed by X-ray crystallographic analysis. UV–vis absorption and fluorescence spectra of the dinaphthoazaborine indicated a decrease in the HOMO–LUMO energy gap compared with that of dibenzoazaborines. Electrochemical measurements elucidated the enhanced electron-accepting characteristics of the dinaphthoazaborine.
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Kunihiro Ichimura
2010 Volume 39 Issue 6 Pages
614-615
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Supplementary material
The dry bead milling of a mixture of anthracene crystals and a tiny amount tetracene in the presence of surface-modified silica nanoparticles led to the fluorescence quenching of anthracene due to the doping of tetracene, supporting the occurrence of crystal mixing under dry conditions.
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Mime Kobayashi, Katsuya Onodera, Yuichiro Watanabe, Ichiro Yamashita
2010 Volume 39 Issue 6 Pages
616-618
Published: June 05, 2010
Released on J-STAGE: May 15, 2010
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Supplementary material
Fabrication of high aspect ratio 3-nm Pt wires was achieved by reducing K
2PtCl
4 with dimethylamine borane in the presence of a tube-shaped tobacco mosaic virus. The presence of a non-ionic detergent, Tween 20 in the reaction mixture prevents aggregation of the virus, and isolated Pt wires can be readily transferred onto silicon surfaces. Our results provide a new chemical approach to fabricate and locate 3-nm Pt wires on a substrate, which could not be achieved using conventional lithography.
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Tetsuya Sasamura, Ken-ichi Okazaki, Ryuta Tsunoda, Akihiko Kudo, Susum ...
2010 Volume 39 Issue 6 Pages
619-621
Published: June 05, 2010
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ZnS–AgInS
2 solid solution (ZAIS) nanoparticles having elements of low toxicity were immobilized on thin ZnO rod array films, and the resulting film worked as an n-type semiconductor electrode for which the photoresponse varied depending on the composition of particles immobilized.
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Yasushi Haga, Takayuki Tonoi, Yoshihide Anbiru, Yuki Takahashi, Sayuri ...
2010 Volume 39 Issue 6 Pages
622-623
Published: June 05, 2010
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Supplementary material
Ascofuranone is a potent inhibitor of trypanosome alternative oxidase. A short and efficient total synthesis of (±)-ascofuranone was accomplished in only seven steps starting with geranyl acetate. The synthetic concept and methodology described in detail here provide a short and simple synthesis for ascofuranone and its derivatives.
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Kan Kanamori, Yuya Shirosaka, Yukie Sakai, Toshiki Kanamori, Yasuyo Mu ...
2010 Volume 39 Issue 6 Pages
624-626
Published: June 05, 2010
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Supplementary material
Nature abounds with examples of aperiodic functions such as hormonal, daily, and seasonal cycles and cardiac rhythms, but establishing a chemical basis of these oscillations has been difficult. Efforts to provide chemical models for the study of oscillating phenomena have focused on halogen-, sulfur-, and manganese-based systems. We show here that a vanadium-based chemical system exhibits oscillatory behavior similar to circadian and other aperiodic rhythms.
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Sho Kitano, Keiji Hashimoto, Hiroshi Kominami
2010 Volume 39 Issue 6 Pages
627-629
Published: June 05, 2010
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Supplementary material
Using adsorption method, a small amount of rhodium ion (Rh
3+) was loaded on nanocrystalline titanium(IV) oxide (TiO
2) with various physical properties prepared by HyCOM and subsequent calcinations at various temperatures. In photocatalytic degradation of 2-propanol under visible light irradiation, Rh
3+-modified HyCOM-TiO
2 samples exhibited higher levels of activity than did nitrogen-doped TiO
2 sample and showed a volcano-like tendency with calcination temperature, suggesting that the balance of surface area and crystallinity of TiO
2 is important in an Rh
3+/TiO
2 photocatalyst.
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