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Toshio Kamijo, Motohiro Kasuya, Masashi Mizukami, Kazue Kurihara
2011 Volume 40 Issue 7 Pages
674-675
Published: July 05, 2011
Released on J-STAGE: May 28, 2011
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We have designed a new apparatus, an electrochemical SFA, for measuring the forces between symmetric gold electrode surfaces under electrochemical potential control. The surface separation was determined by two-beam (twin-path) interferometry. The potential was applied to the gold surfaces (working electrode) in 1 mM aqueous KClO
4 using Ag/AgCl as the reference and Pt as the counter electrode. We observed the van der Waals attraction and the double layer repulsion which decreased with the increasing potential from −0.1 to 0.2 V (vs. Ag/AgCl).
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Weiwei He, Huimin Jia, Shanshan Guo, Zhi Zheng
2011 Volume 40 Issue 7 Pages
676-677
Published: July 05, 2011
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Supplementary material
An online ultrasensitive method for detection of nickel ions by capillary electrophoresis–post chemiluminescence with field-amplified sample injection has been developed. Under the optimal conditions, the detection limit for Ni
2+ was 1.0 × 10
−14 mol L
−1, relative standard deviations of peak area and migration time using 1.0 × 10
−12 mol L
−1 Ni
2+ (
n = 7) were 6.23% and 2.86%, respectively. This is a lower detection limit for Ni
2+ than previously reported. The proposed method was successfully applied to the separation of Hg
2+, Ni
2+, and Cu
2+ in a mixture.
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Kodai Saito, Yoshihiro Saigusa, Toshiki Nokami, Jun-ichi Yoshida
2011 Volume 40 Issue 7 Pages
678-679
Published: July 05, 2011
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Supplementary material
Electrochemically generated ArS(ArSSAr)
+ was found to be an effective activator for glycosylation of thioglycosides. Efficiency of the reaction strongly depends on the nature of the counter anion, and B(C
6F
5)
4− was the most effective among those examined. The method was applicable to various glyocosyl donors including thiogalactosides and thiomannosides and various acceptors including those having secondary hydroxy groups.
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Sakiko Kikuchi, Hiroko Makita, Satoshi Mitsunobu, Yasuko Terada, Norik ...
2011 Volume 40 Issue 7 Pages
680-681
Published: July 05, 2011
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Supplementary material
Speciation of iron (Fe) precipitated on bacterial stalks was studied by Fe K-edge µ-XRF-XAFS. Micro-XRF analysis of the stalk samples showed that Fe is precipitated around the stalk. All the µ-XANES spectra at several Fe-accumulated parts showed similar spectra. This study indicated that synchrotron µ-XRF-XAFS is a powerful tool for chemical speciation of metals at single-cell level for bacteria bearing metal.
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Tsuyoshi Ochiai, Hirofumi Moriyama, Kazuya Nakata, Taketoshi Murakami, ...
2011 Volume 40 Issue 7 Pages
682-683
Published: July 05, 2011
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Supplementary material
The efficient decomposition of environmentally persistent perfluorooctanoic acid (PFOA) was achieved by a hybrid of electrolysis and photocatalysis. The rate constant of PFOA decomposition in the hybrid system was larger than the sum of the constants in electrolysis-only and photocatalysis-only systems. The hybrid system was able to accelerate the PFOA decomposition by complementally support of two kinds of reaction kinetics. These results could be useful for development of a new continuous system for practical treatment of waste water containing perfluorinated acids.
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Hang Zhao, Wen Huang, Xiaohua Wu, Yong Qing, Zhihua Xing, Yang He
2011 Volume 40 Issue 7 Pages
684-686
Published: July 05, 2011
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Supplementary material
Novel Janus-type guanosine–cytosine pyrimido[4,5-
d]pyrimidine and its 2′-deoxyribonucleoside have been synthesized in a viable route employing the Vorbruggen method.
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Keizo Nakagawa, Kazuki Yamaguchi, Keiji Yamada, Toshimasa Ogata, Ken-I ...
2011 Volume 40 Issue 7 Pages
687-689
Published: July 05, 2011
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Supplementary material
Titanate nanosheets with a lamellar mesostructure were developed using the lamellar self-assembly of cationic 1,12-dodecanediamine (DDA) as a template. An electrostatic interaction between negatively charged titanate nanosheets and positively charged DDA molecules was required to form layered titanate nanosheets. This approach leads to titanate nanosheet surface characteristics such as visible light absorption and high adsorption of hydrophobic organic compounds.
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Kazuki Mori, Kazuhisa Sakakibara
2011 Volume 40 Issue 7 Pages
690-692
Published: July 05, 2011
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The origin of the difference of melting points (
Tm) between tertiary and quaternary ammonium triflates has been investigated by ab initio and molecular dynamics simulations. Experimentally,
Tm of tertiary ammonium triflates are lower than those of quaternary ammonium triflates. In this work, we used [N
122H][TfO] and [N
1113][TfO] as typical models of tertiary and quaternary ammonium triflates, and the mutual arrangement of these cation–anion pairs were discussed to elucidate the difference of the melting points of these systems.
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Amata Chaikriangkrai, Yuka Takeshita, Masashi Shibata
2011 Volume 40 Issue 7 Pages
693-695
Published: July 05, 2011
Released on J-STAGE: June 04, 2011
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The relationship between synthesis conditions of iron-containing mesoporous silica (Fe-MCM-41) and UV–visible absorbance was studied. Fe-MCM-41 with high UV absorption and low visible absorption was effectively synthesized by using [Fe(acac)
3] as an iron source and employing calcination for the template removal. The obtained Fe-MCM-41 did not exhibit photocatalytic activity as determined by dye decomposition, and its SPF and PA values were at an acceptable level, concluding that there is a possibility as a new sunscreen agent.
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Ryoji Mitsuhashi, Takayoshi Suzuki, Yukinari Sunatsuki, Masaaki Kojima
2011 Volume 40 Issue 7 Pages
696-698
Published: July 05, 2011
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Supplementary material
Cobalt(III) complexes with
N-(aminoalkyl)salicylamide dianions, L
n2− (
n = 1–4), have been prepared and their molecular and crystal structures have been determined. The geometric (
mer- or
fac-) selectivity of [Co(L
n)
2]
− complexes was dependent on the number of the amine–amidato chelate ring member. Intermolecular homochiral hydrogen-bonds and solvatochromic behavior of the complexes were also observed.
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Kin-ya Tomizaki, Tatsuki Kotera, Hideki Naito, Shota Wakizaka, Shin-ic ...
2011 Volume 40 Issue 7 Pages
699-701
Published: July 05, 2011
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There is increasing interest in nanostructures and in the molecular design of building blocks which self-assemble into nanoscaled intelligent materials. We outline a method for controlling the nanostructures of amphiphilic nonapeptides by changing the pH of the aqueous medium. A lysine residue on the hydrophilic face of the peptide plays a critical role as a morphology-control unit. This self-assembling peptide may, therefore, find application as a template for peptide-directed biomineralization.
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Gao-Qiang Li, Shunsuke Kiyomura, Yasunori Yamamoto, Norio Miyaura
2011 Volume 40 Issue 7 Pages
702-704
Published: July 05, 2011
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Supplementary material
Conversion of pinacol arylboronic esters
3 to aryl triolborates
5 via transesterification with 1,1,1-tris(hydroxymethyl)ethane (
4) was established with the advantages of tolerance to various functional groups. Transesterification was carried out at 30–60 °C in dioxane in the presence of MOH (M = Na and K) and H
2O. High yields were achieved for stable aryl triolborates
5.
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Soichiro Tsujimoto, Chiya Nishimura, Toshiyuki Masui, Nobuhito Imanaka
2011 Volume 40 Issue 7 Pages
708-710
Published: July 05, 2011
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C-type cubic (Yb
1−xTb
x)
2O
3±δ (0 ≤
x ≤ 0.62) catalysts were synthesized by coprecipitation. Among the samples prepared, (Yb
0.50Tb
0.50)
2O
3±δ showed the highest catalytic activity and high tolerability for O
2 or CO
2 coexistence was recognized. In particular, the negative effect of CO
2 on the NO decomposition activity is significantly reduced compared to those of conventional catalysts, and N
2 yield as high as 33% was obtained even in the presence of 5 vol % CO
2.
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Kazunori Matsuura, Keigo Tochio, Kenta Watanabe, Nobuo Kimizuka
2011 Volume 40 Issue 7 Pages
711-713
Published: July 05, 2011
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Supplementary material
Nanospheres formed by self-assembly of trigonal glutathione (
TG) underwent disulfide recombination upon addition of dithiothreitol. Guest molecules encapsulated in the nanospheres were gradually released during the recombination process.
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Atsuya Muranaka, Mitsuhiro Yonehara, Machiko Hirayama, Asami Saito, Na ...
2011 Volume 40 Issue 7 Pages
714-716
Published: July 05, 2011
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A novel tribenzotetraazaporphyrin with a fused azulene ring was synthesized via mixed condensation reaction of 5,6-dicyanoazulene and 3,6-dibutoxyphthalonitrile. The macrocycle exhibited several intense absorption peaks from 600 to 900 nm. The spectroscopic properties were analyzed by DFT calculations.
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Joe Otsuki, Megumi Taka, Daiya Kobayashi
2011 Volume 40 Issue 7 Pages
717-719
Published: July 05, 2011
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Supplementary material
We provide evidence that a heteroleptic double-decker complex of Ce with phthalocyanine and porphyrin ligands undergoes rotational libration in solution for the first time on the basis of variable-temperature
1H NMR. On the other hand, the Zr complex with the same set of ligands undergoes no rotational motion. These molecules deposited on graphite surfaces exhibited different shapes in STM images, revealing difference in the rotational motion at the molecular level.
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Takashi Sakamoto, Hikaru Hayakawa, Kenzo Fujimoto
2011 Volume 40 Issue 7 Pages
720-721
Published: July 05, 2011
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Supplementary material
To develop a molecular imaging probe for potassium cation based on the chemical shift change of
19F magnetic resonance (MR), thrombin aptamer, whose structure was changed with the selective binding of potassium cation, was labeled with a fluorine compound. We demonstrated that the probe could detect potassium cation by chemical shift change of the
19F MR signal, and that the chemical shift change was caused by potassium cation selective G-quadruplex formation.
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Hiroyasu Seki, Noritaka Abe, Yoshimoto Abe, Takahiro Gunji
2011 Volume 40 Issue 7 Pages
722-723
Published: July 05, 2011
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Supplementary material
Novel pentacyclic ladder oligomethylsilsesquioxane was synthesized using
cis,
trans,
cis-[MeSi(NCO)O]
4 as a building block. This compound was isolated in 13% yield by reprecipitation from the reaction mixture. X-ray crystallography revealed that pentacyclic rings assume a
syn,
anti,
syn-configuration, resulting in the tube-like structure.
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Hiroyuki Aota, Takeshi Ishikawa, Yutaro Maki, Dai Takaya, Hiroaki Ejir ...
2011 Volume 40 Issue 7 Pages
724-725
Published: July 05, 2011
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Supplementary material
Band gap controllable, water-soluble, and π-conjugated polymers were prepared by the addition–condensation of pyrrole (Py), 1,2,3-trihydroxybenzene (THB), and sodium
o-formylbenzenesulfonate (BS) with different Py/THB/BS ratios. Band gap values are continuously controlled from 0.3 to 1.1 eV in aqueous solutions by changing molecular weights and monomer unit sequences.
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Qing-Fu Sun, Sota Sato, Makoto Fujita
2011 Volume 40 Issue 7 Pages
726-727
Published: July 05, 2011
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Supplementary material
Bent bridging ligands appending dendrons (G-1, G-2, and G-3) at their concaves are complexed with Pd(II) ions to self-assemble into M
12L
24 spherical shells confining inversely branched dendrimers. Their structures were fully characterized by NMR, CSI-TOF-MS, and AFM.
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Xudong Luan, Chunmei Gao, Qinsheng Sun, Chunyan Tan, Hongxia Liu, Yiba ...
2011 Volume 40 Issue 7 Pages
728-729
Published: July 05, 2011
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Supplementary material
Novel azaacridine analogues were synthesized and their antiproliferative activities against K562 and HepG-2 cell lines were evaluated, among which compound
5a was found to display good cytotoxicity. UV–visible spectral absorbance measurements showed that
5a can bind with calf thymus DNA (ct DNA). A relaxation assay indicated that
5a inhibits topoisomerase 1 activity.
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Yuichi Kato, Yasuro Niidome, Naotoshi Nakashima
2011 Volume 40 Issue 7 Pages
730-732
Published: July 05, 2011
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Supplementary material
The thermodynamics of the exchange of solubilizers adsorbed on single-walled carbon nanotubes (CNTs) is probed by analysis of the spectral shifts of the CNTs in the near-infrared region. Equilibrium constants and thermodynamic parameters of the exchange of sodium cholate for DNA (20-mers of oligo DNAs, cytosine) on CNTs of different chirality are determined.
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Takaharu Yasuzuka, Kazuki Komatsu, Hiroyuki Kagi
2011 Volume 40 Issue 7 Pages
733-735
Published: July 05, 2011
Released on J-STAGE: June 11, 2011
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A new high-pressure phase transition of pyridine at 5.0 GPa was found using Raman and IR spectroscopy. Application of pressure over 20 GPa induced irreversible polymerization of pyridine, and a yellow-brownish solid material was recovered at ambient condition. The X-ray diffraction pattern revealed that the recovered solid material contained a crystalline phase in contrast to amorphization of other aromatic compounds in a similar pressure region.
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Ya Peng, Guangbin Zhao, Ke Wang, Rongbai Tong, Fei Sun, Fangfang Mei, ...
2011 Volume 40 Issue 7 Pages
736-738
Published: July 05, 2011
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A series of aliphatic waterborne polyurethane (WPU) dispersions with high ionic concentration were synthesized by prepolymer mixing. The resultant structure–property relationships were investigated. It was revealed that there was a new microphase besides the phase separation between the soft and the hard domains. The new microphase separation found in the hard domains was formed by aggregation of the ionic groups characterized by dynamic mechanical analysis, FTIR characterization, and thermal gravimetric analysis.
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Toshihiro Okamoto, Tsuyoshi Suzuki, Shungo Kojima, Yutaka Matsuo
2011 Volume 40 Issue 7 Pages
739-741
Published: July 05, 2011
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Supplementary material
Acetetracenylene-1,2-dione was synthesized by double Friedel–Crafts acylation of tetracene with oxalyl chloride in 46–54% yield. Photophysical, electrochemical, and thermal analysis of the compound revealed its band gap (
Eg = 1.77 eV for the solid state), electron-accepting nature (
Epcred = −1.35 V vs. Fc/Fc
+), and thermal stability (
Tdecomp > 300 °C). Single crystals were successfully grown by physical vapor transport, and parallel π-stacking of the molecules was observed by X-ray crystallography.
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Hana Seo, Ken Ohmori, Keisuke Suzuki
2011 Volume 40 Issue 7 Pages
744-746
Published: July 05, 2011
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Supplementary material
Various multisubstituted benzenes were synthesized in highly chemo- and regioselective manners via nucleophilic aromatic substitution and
ortho-metalation from 1,3,5-trifluorobenzene.
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K. C. Majumdar, Krishanu Ray, Sintu Ganai
2011 Volume 40 Issue 7 Pages
747-749
Published: July 05, 2011
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Supplementary material
A simple and efficient method for the synthesis of some hitherto unreported pyrimidine-annelated spiro-heterocycles via 5-
endo mode iodocyclization has been described. The reaction is an example of iodocyclization of 1,5-enynes which proceeds in the absence of base and affords the products in excellent yields.
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Takayuki Matsunaga, Takayuki Kubota, Toyonari Sugimoto, Masaharu Satoh
2011 Volume 40 Issue 7 Pages
750-752
Published: July 05, 2011
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Supplementary material
A coin cell battery is fabricated using triquinoxalinylene as a cathode active material and a lithium metal anode. The first discharge curve shows a remarkably large capacity (420 A h kg
−1), which corresponds to a six electron migration in the first charge. However, repeating the charge–discharge until the 15th cycle gradually decreases the capacity, but after that the capacity remains constant with a value of 220 A h kg
−1. This large value remains even after 100 cycles. Additionally, the use of a tribromo-substituted derivative gives a large discharge capacity (≈250 A h kg
−1) due to a comparatively stable six electron migration from the first charge–discharge cycle.
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Qiusheng Wang, Dunmeng Li, Wenrui Liang, Jie Ouyang
2011 Volume 40 Issue 7 Pages
753-755
Published: July 05, 2011
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A novel, sensitive, and highly selective fluorescent probe which contains 2-(2-hydroxyphenyl)benzimidazole receptor groups has been prepared for detecting glutathione (GSH) that operates under aqueous conditions. The complex of the fluorescent compound with copper(II) ion was selectively responsive to GSH and induced a recovery of blue fluorescence.
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Kohtaro Goto, Nueramina Nuermaimaiti, Mamoru Mizuno
2011 Volume 40 Issue 7 Pages
756-757
Published: July 05, 2011
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A novel heavy fluorous thioglycoside
6 was developed and applied to oligosaccharide synthesis. The fluorous thioglycoside
6 was readily prepared via the corresponding fluorous thiol. Synthesis of the LacdiNPhth derivative was briefly achieved with a single-column chromatographic purification by using a heavy fluorous tag method. Additionally, the fluorous tag was recovered as fluorous alcohol
1 in high yield.
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Koji Omori, Yoshinori Takashima, Hiroyasu Yamaguchi, Akira Harada
2011 Volume 40 Issue 7 Pages
758-759
Published: July 05, 2011
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Supplementary material
Rotaxanes are considered to be prototype molecular machines bearing a rotor and an axis within a molecule. In our study on complex formation of modified α-CDs as host molecules for guest molecules consisting of an alkyl chain with pyridyl end caps, we observed control of complex formation and dissociation by pH responses of functional groups on modified α-CDs.
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Feng Yu, Chao Xu, Wenbo Zhang, Min Guo, Dahai Pan, Ruifeng Li
2011 Volume 40 Issue 7 Pages
760-761
Published: July 05, 2011
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Supplementary material
A mesoporous sulfated zirconia–silica material with high hydrothermal stability was prepared by a two-step hydrothermal treatment process in a pH range of 1.65–3. This material still showed high surface area, large pore volume, and uniform structure after steam treatment at 800 °C for 5 h. In cumene cracking, the material exhibited relatively steady catalytic activity even after steam treatment at 600 °C for 2 h.
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Hiroto Kudo, Hideatsu Ishihara, Masashi Tomita
2011 Volume 40 Issue 7 Pages
762-764
Published: July 05, 2011
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Polycondensation reaction of 1,3-dimethoxybenzene and TeCl
4 was performed at a feed ratio of 1,3-DMB/TeCl
4 = 1/10 without catalyst in 1,4-dioxane at 60 °C for 48 h, affording poly(1,3-DMB-
co-Te) with
Mn = 45100 and
Mw/
Mn = 1.89 in 75% yield, with release of HCl.
1H NMR, IR, and X-ray fluorescence spectroscopy indicated that poly(1,3-DMB-
co-Te) had a partially branched skeleton. This polymer had good solubility, good film-forming ability, high thermal stability, and a high refractive index (1.769 at 0.6328 µm).
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Masafumi Yamato, Yuki Kudo, Kohki Takahashi, Kazuo Watanabe, Naoshi Ka ...
2011 Volume 40 Issue 7 Pages
765-767
Published: July 05, 2011
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The magnetic alignment of poly(
L-lactic acid) (PLA) containing octamethylenedicarboxylic dibenzoylhydrazide (OMBH) as a nucleating agent was studied. OMBH also affected PLA as a nucleating agent when about 5 wt % of d-type material was included. The magnetic alignment of PLA including OMBH was achieved. The
c axis of the PLA was parallel to the magnetic field.
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Moon-Youl Choi, Dae-Suk Kim, Dae Seung Hong, Jung Ho Kim, Yong-Tae Kim
2011 Volume 40 Issue 7 Pages
768-769
Published: July 05, 2011
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Ultrastable aqueous graphite nanofluids were prepared by single-step liquid-phase pulsed laser ablation (LP-PLA), and they showed an outstanding long-term stability without any agglomeration, even though no surfactant was used. It was revealed with FT-IR spectroscopy that the hydrophilic functional groups were introduced onto the surface of graphite nanoparticles and that such hydrophilic nature showing a high negative ζ potential was the origin of the outstanding long-term stability. Finally, aqueous graphite nanofluids demonstrated an enhanced thermal conductivity by 1.49% with low concentration (0.02 vol %), compared to pure water.
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Hiroki Kawai, Giacomo Giorgi, Koichi Yamashita
2011 Volume 40 Issue 7 Pages
770-772
Published: July 05, 2011
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The asymmetry of (GaAs)
1−x(Ge
2)
x band gap bowing, as a function of Ge concentration, is investigated by ab initio calculations. We show that the nature of the chemical bonds violating the octet rule in such alloys is affected by the local geometry: the switching of the cluster type between Ge to GaAs domain at Ge concentration of about 0.3 plays a fundamental role in the final asymmetry.
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Md. Shariful Islam, Yoshihumi Kusumoto, Md. Abdulla-Al-Mamun, Yuji Hor ...
2011 Volume 40 Issue 7 Pages
773-775
Published: July 05, 2011
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Nanosized neck-structured α-Fe
2O
3 nanoparticles were prepared successfully from iron(II) chloride tetrahydrate solely by hydrothermal method. FE-SEM and TEM studies revealed a unique necked structure with a particle size of ca. 50–60 nm. The synthesized nanomaterials showed excellent colloidal stability and magnetization ability. Finally, the as-prepared α-Fe
2O
3 nanoparticle suspensions showed almost 100% cancer cell killing by the significant temperature increment when an AC (alternating current) magnetic field and photoirradiation were applied at a concentration of 80 µg mL
−1 MEM (minimum essential medium).
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Daisuke Fukushi, Motohiro Kasuya, Hiroshi Sakuma, Kazue Kurihara
2011 Volume 40 Issue 7 Pages
776-778
Published: July 05, 2011
Released on J-STAGE: June 25, 2011
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Supplementary material
A fluorescence lifetime measurement was performed for monitoring the viscosity of a confined liquid (glycerol) film between mica surfaces using a cyanine dye, Cy1, as a viscosity probe at various film thicknesses. The fluorescence decay curve consisted of two components, i.e., one attributed to the Cy1 in the central part of the liquid between the surfaces and another to the Cy1 adsorbed on the surfaces. The increased lifetime of the former indicated the increase in the viscosity of the confined liquid.
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