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Volume 42, Issue 6
Displaying 1-35 of 35 articles from this issue
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Highlight Review
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Shuhei Furukawa, Yoko Sakata, Susumu Kitagawa2013 Volume 42 Issue 6 Pages 570-576
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 24, 2013
JOURNAL FREE ACCESSEntangled porous coordination frameworks, wherein two or more distinct frameworks are catenated over an entire crystal, are known to demonstrate unique structural flexibilities in response to the accommodation of molecules in the voids between the frameworks. In this highlight review, we introduce key functions of entangled frameworks based on two principles of their dynamic features: shearing and displacement. We further describe strategies to control the flexibilities; one is a molecular chemistry approach to functionalize frameworks by chemical modification, and the other is a mesoscopic chemistry approach to change the physical form, in particular, the crystal size.Entangled porous coordination frameworks, wherein two or more distinct frameworks are catenated over an entire crystal, are known to demonstrate unique structural flexibilities in response to the accommodation of molecules in the voids between the frameworks. In this highlight review, we introduce key functions of entangled frameworks based on two principles of their dynamic features: shearing and displacement. We further describe strategies to control the flexibilities; one is a molecular chemistry approach to functionalize frameworks by chemical modification, and the other is a mesoscopic chemistry approach to change the physical form, in particular, the crystal size. Fullsize ImageView full abstract
Letter
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Minyung Song, Sung-rheb Cho, Suk Tai Chang2013 Volume 42 Issue 6 Pages 577-579
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 03, 2013JOURNAL RESTRICTED ACCESSHollow core polyacrylonitrile (PAN) microfibers with nano- and microporosity are synthesized based on the regeneration of PAN from dimethyl sulfoxide in a hydrodynamic flow-focusing microfluidic device. This technique is a fast and one-step approach to fabricate such core–shell microfibers. The fiber size (20–45 µm) and the nanopore size (90–300 nm) are well controllable by simply changing core–sheath flow rate and PAN concentration.View full abstract -
Takuya Noguchi, Masahiro Sekine, Yuki Yokoo, Seunghee Jung, Nobuyuki I ...2013 Volume 42 Issue 6 Pages 580-582
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: April 24, 2013JOURNAL RESTRICTED ACCESSPrimary amides were easily prepared in 22–99% yields from the corresponding carboxylic acids 1 or 5 with NH4Cl via activation with ClCO2Et and Et3N. The enantiomers of the corresponding primary amides of Cbz-, Boc-, or Fmoc-α-amino acids can be separated by using a chiral column.View full abstract -
Suguru Yoshida, Takamitsu Hosoya2013 Volume 42 Issue 6 Pages 583-585
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 03, 2013JOURNAL OPEN ACCESSArynes, generated in situ from o-(trimethylsilyl)aryl triflates by treatment with a fluoride, have been shown to react efficiently with various alkoxyphosphines via a mechanism similar to the Michaelis–Arbuzov reaction. Diverse aromatic oxophosphorus compounds, including derivatives with an ortho-ester function, have become easily available from a common aryne precursor by this method.View full abstract -
Keita Nakai, Syuji Fujii, Yoshinobu Nakamura, Shin-ichi Yusa2013 Volume 42 Issue 6 Pages 586-588
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 03, 2013JOURNAL OPEN ACCESS
Supplementary materialPhotoresponsive liquid marbles were prepared using spiropyran (SP) powder. The liquid marbles were transferred to a Petri dish containing water and remained stable on the water surface for more than a week in the dark. The liquid marbles disintegrated immediately upon irradiation with ultraviolet (UV) light.View full abstract -
Hiromichi Aono, Kazumasa Tamura, Erni Johan, Rie Yamauchi, Toru Yamamo ...2013 Volume 42 Issue 6 Pages 589-591
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 08, 2013JOURNAL RESTRICTED ACCESSFor the decontamination of radioactive 134Cs and 137Cs using magnetic collection, a new composite material consisting of a Na-P1-type zeolite and magnetite was synthesized from the waste fly-ash from thermal power stations and iron chlorides. The presence of nanosized magnetites in the polycrystalline zeolite (several micrometers) was confirmed by TEM observations. The cation-exchange capacity (CEC) and magnetic properties of these composite materials were characterized.View full abstract
Editor’s Choice
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Akihito Konishi, Yasukazu Hirao, Kouzou Matsumoto, Hiroyuki Kurata, Ta ...2013 Volume 42 Issue 6 Pages 592-594
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 18, 2013JOURNAL OPEN ACCESS
Supplementary materialThe improved Scholl reaction allows for the direct cyclization of anthracene oligomers to give bisanthene, teranthene, and quateranthene. Furthermore, a variety of π-expanded bisanthenes are obtained by the Diels–Alder cycloaddition of bisanthene with several arynes. These reactions would allow us to synthesize various size- and shape-controlled polyperiacenes.View full abstract
Letter
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One-pot Anatase TiO2 Nanocoating on Multiwalled Carbon Nanotubes via Liquid-phase Deposition ProcessDaisuke Sakemi, Hackkeun Lee, Roman Selyanchyn, Seung-Woo Lee2013 Volume 42 Issue 6 Pages 595-597
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 08, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialThe facile one-pot fabrication of anatase TiO2-coated multiwalled carbon nanotubes (MWCNTs) via a liquid-phase deposition process is demonstrated. Optimization of the deposition parameters of precursor concentration and reaction temperature was investigated for the achievement of a uniform titania coating on the surface of MWCNTs.View full abstract -
Hidenori Miyamoto, Misako Aida2013 Volume 42 Issue 6 Pages 598-600
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 15, 2013JOURNAL OPEN ACCESS
Supplementary materialHelmholtz free-energy changes in aqueous solution along two paths of glycine tautomerization were investigated by using an ab initio QM/MM-MC method with the thermodynamic perturbation theory. Glycine and one water molecule were treated at the quantum mechanics (QM) level of MP2/6-31G(d); these were surrounded by 100 water molecules at the molecular mechanics (MM) level of TIP3P. AIM (atoms-in-molecules) analysis showed that the transfer of two hydrogen atoms occurs simultaneously along the water-mediated path. The free-energy barrier height of this path in aqueous solution was higher than that of the direct path.View full abstract -
Masahiro Furutani, Kazuaki Kudo2013 Volume 42 Issue 6 Pages 601-603
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 15, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialA cyclic dipeptide cyclo[–L-methionyl–L-methionyl–] and gold(I) cation were found to form a complex in a 1:2 ratio. Pouring a DMF solution of the complex into ethyl acetate afforded fibers with lengths of more than 20 µm and 100–400 nm in width, which consisted of fibrous nanostructures 50–100 nm in diameter. Treatment of this supramolecular fiber with catechol gave linearly aligned Au nanoparticles on the original fibers.View full abstract -
P. Sambasiva Rao, K. Rathnakar Reddy, P. Nagender, Royya Naresh Kumar, ...2013 Volume 42 Issue 6 Pages 604-605
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
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Supplementary materialAn efficient synthetic protocol has been developed for the synthesis of the novel 1,2,3-triazole- and isoxazole-substituted xanthene-1,8(2H)-dione derivatives 3 and 5, respectively, from the reaction of 1,2,3-triazole-4-carbaldehyde 2 or isoxazole-5-aldehyde 4 with cyclohexanedione 1, using indium triflate as a catalyst.View full abstract -
Kohei Miyazaki, Tomokazu Fukutsuka, Takeshi Abe, Zempachi Ogumi2013 Volume 42 Issue 6 Pages 606-608
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
JOURNAL RESTRICTED ACCESSStep-edge-decorated graphite electrodes with Pt nanoparticles were fabricated by pulsed laser deposition (PLD), and the impacts of the morphological change of Pt nanoparticles on the electrocatalytic activities were investigated. Primary Pt particles (about 5 nm in diameter) were formed by PLD and were aggregated along the step-edge lines of highly oriented pyrolytic graphites (HOPGs). An increase in the temperature of the HOPG substrate leaded to the diffusion of Pt particles along the step-edge lines of HOPG and resulted in the agglomeration of Pt particles (100–150 nm in diameter). As for methanol oxidation, it is found that the agglomerated Pt particles exhibited higher catalytic activities than small Pt nanoparticles on HOPGs.View full abstract -
Jin Motoyanagi, Tomoyuki Matsumoto, Takumi Shiotani, Sadao Miki, Masah ...2013 Volume 42 Issue 6 Pages 609-611
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 24, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialWell-defined six-armed amphiphilic star polymers (TP-C0-PMAPEG)s and (TP-C5-PMAPEG)s bearing a triphenylene core were designed as dispersants of carbon nanotubes, and synthesized via controlled radical polymerization. It was found that these star polymers were capable of forming stable dispersions of single-walled and multiwalled carbon nanotubes in polar media such as MeOH and water.View full abstract -
Chie Kojima, Hiroki Kawabata, Atsushi Harada, Hiromichi Horinaka, Kenj ...2013 Volume 42 Issue 6 Pages 612-614
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: April 24, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialGold nanoparticles (Au NPs) have been used in photothermal therapy and imaging applications, whereas PEGylated dendrimers have been used for the development of drug delivery systems. The loading of an Au NP into a PEGylated dendrimer has been reported previously in the literature. In this paper, Au NPs within the dendrimer have been modified with alkanethiols to improve their drug-loading ability, based on their enhanced inner hydrophobicity. Modifications allowing for the incorporation of a substantial amount of octadecanethiol led to an improvement in the drug-encapsulation ability of the PEGylated dendrimer.View full abstract -
Seok-Joo Wang, Yong-June Choi, Byungwook Yoo, Yong-Hoon Kim, Hyung-Ho ...2013 Volume 42 Issue 6 Pages 615-617
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 03, 2013JOURNAL RESTRICTED ACCESSThe effects of Ag nanoparticle (NP) incorporation on the bonding state and electronic properties of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films were investigated. Surface stabilization of the Ag NPs by trisodium citrate effectively prevented aggregation of the Ag NPs. The introduction of Ag NPs induced PEDOT moieties as chemisorption centers. The resulting PEDOT-rich film surface with Ag NPs was responsible for the enhanced film conductivity and decreased work function of the Ag NP–PEDOT:PSS film.View full abstract -
Ken-ichi Katsumata, Yuki Okayasu, Nobuhiro Matsushita, Kiyoshi Okada2013 Volume 42 Issue 6 Pages 618-620
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 08, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialThe photoinduced hydrophilicity of SrTiO3 single crystals with (100), (110), and (111) facets was investigated. The (100) and (111) facets had a higher hydrophilic conversion rate under UV irradiation than the (110) facet. This is attributed to an unstable O atom on the surface of the (100) and (111) facets. The crystal-face dependence of the hydrophilic conversion was weakened by repeated UV irradiation, which indicates that an irreversible structural change is caused on the SrTiO3 surface by UV irradiation.View full abstract -
Eiichi Kayahara, Takahiro Iwamoto, Toshiyasu Suzuki, Shigeru Yamago2013 Volume 42 Issue 6 Pages 621-623
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
JOURNAL OPEN ACCESS
Supplementary materialThe selective synthesis of [6]-, [8]-, and [10]cycloparaphenylenes (CPPs) was achieved by a new synthetic route involving Ni(0)-mediated coupling of bis(para-haloaryl)dinuclear arylplatinum complexes and the reductive elimination of the complexes. Importantly, the highly strained [6]CPP was prepared in good overall yield.View full abstract -
Shungo Zen, Daiki Saito, Ryo Ono, Tetsuji Oda2013 Volume 42 Issue 6 Pages 624-626
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
JOURNAL RESTRICTED ACCESSDye-sensitized solar cells (DSSCs) require the sintering of TiO2 paste at 450–550 °C in their manufacture. However, high-temperature sintering is disadvantageous because it limits the use of materials that cannot withstand high temperatures. We have developed a new technique for reducing the sintering temperature through ultraviolet (UV) treatment of the TiO2 photoelectrode. The UV treatment enables the sintering temperature to be reduced 250 °C while maintaining the energy conversion efficiency.View full abstract -
Xiaopeng Meng, Jiqiu Wen, Yadong Yao, Yi Ding, Yichao Gong, Changwu Zo ...2013 Volume 42 Issue 6 Pages 627-629
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 15, 2013JOURNAL RESTRICTED ACCESSCarbon-encapsulated copper nanoparticles (CECNPs) are synthesized from a precursor derived easily through a refluxing method. The as-synthesized CECNPs are monodispersed with a uniform size distribution and obvious core–shell structure. The formation process of the CECNPs is investigated, and the possible mechanism is proposed. Furthermore, TG-DSC measurements, in conjunction with the corresponding XRD patterns, reveal that the as-synthesized CECNPs show excellent oxidation resistance to temperatures up to 900 °C.View full abstract -
Hideyuki Tukada, Toshihiro Hiraki, Hiroshi Nakamura2013 Volume 42 Issue 6 Pages 630-632
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 18, 2013JOURNAL RESTRICTED ACCESS
Supplementary material[2]Rotaxanes constructed with an ethereal end-capped axle and a dibenzo-24-crown-8 wheel were synthesized from pseudorotaxanes bearing an alcoholic terminus and diaryldiazomethanes using diphenyl phosphate as a catalyst. The reaction proceeded at room temperature in nonpolar solvents within several hours. The [2]rotaxanes thus obtained behaved as ammonium salts derived from a very strong base such as DBU. Thus, the amine form of the [2]rotaxane reacted with a weak acid, CO2–H2O, to give a hydrogencarbonate salt of the [2]rotaxane, which turned back to the amine form after drying followed by evacuation.View full abstract -
Jun Kawai, Seema Jagota, Takeo Kaneko, Yumiko Obayashi, Bishun N. Khar ...2013 Volume 42 Issue 6 Pages 633-635
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 18, 2013JOURNAL RESTRICTED ACCESSExperimental simulations have previously shown that tholins (complex solid organics) can be abundantly formed in Titan’s atmosphere and that they contain precursors of amino acids. In this study, we investigated their relevance to possible chemical evolution toward the generation of life in various potential Titan environments (liquidospheres), using tholins synthesized by plasma discharge at low pressure (LP, 26 Pa) and high pressure (HP, 133 Pa). We focused our study on composition of amino acids recovered from LP and HP tholins, as well as on the solubility of these tholins in solvents such as hexane, acetonitrile, ethanol, methanol, water, and ammonia water. Both hydrolyzed extracts of LP and HP tholins were composed of a wide variety of amino acids. Tholins were dissolved more easily in polar solvents than in nonpolar ones: Ammonia water, simulating a potential Titan subsurface ocean, could dissolve tholins quite efficiently. These results show thus the possibility of starting chemical evolution toward life’s origin in Titan’s environment.View full abstract -
Norio Tagawa, Akito Masuhara, Shuji Okada, Hiroshi Katagiri, Tsunenobu ...2013 Volume 42 Issue 6 Pages 636-637
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
JOURNAL RESTRICTED ACCESSDiarylethene nanorods have been fabricated through the reprecipitation method by using cis-1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene (CMTE), and their crystal structure and photochromic properties have been investigated. Through the addition of a surfactant, CMTE formed nanorods during the reprecipitation process. The crystal structure of the CMTE nanorods was investigated as well as that of the bulk crystals. In addition, the CMTE nanorods exhibited photochromism.View full abstract -
Taku Shoji, Atsuyo Yamamoto, Erika Shimomura, Mitsuhisa Maruyama, Shun ...2013 Volume 42 Issue 6 Pages 638-640
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 18, 2013JOURNAL RESTRICTED ACCESSThe synthesis of 1,6′-biazulenes 3a and 3b and 1,6′:3,6′′-terazulenes 7a and 7b was established by one-pot reactions via the Zincke-type ring-opening of the corresponding pyridinium salts with diethylamine, followed by the reaction with cyclopentadiene in the presence of sodium methoxide. The intramolecular charge-transfer characters between azulene rings were investigated by UV–vis spectroscopy and theoretical calculations.View full abstract -
Akihiro Yokoyama, Makoto Karasawa, Masahisa Taniguchi, Tsutomu Yokozaw ...2013 Volume 42 Issue 6 Pages 641-642
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 18, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialTo successively construct two amide bonds between two benzene rings, the reaction of methyl N-alkylanthranilate and N-alkylisatoic anhydride in the presence of a base was studied. When the reaction was carried out with lithium hexamethyldisilazide and N,N,N′,N′-tetramethylethylenediamine in THF at 70 °C under reduced pressure, a cyclic diamide was obtained in high yield.View full abstract -
Hatsuo Yamamura, Kyohei Shimohara, Ryuji Kurata, Yusuke Fujita, Kensuk ...2013 Volume 42 Issue 6 Pages 643-645
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
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Supplementary materialThe chemical polymodification of cyclodextrins and amyloses proceeded quickly with use of the microwave-assisted Huisgen reaction in an all-or-none fashion without the formation of less-modified by-products.View full abstract -
Hiroki Ito, Daichi Watanabe, Tatsuya Yamamoto, Noboru Tsushima, Hiroki ...2013 Volume 42 Issue 6 Pages 646-648
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 15, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialNovel thiophene-condensed 1,4-dithiin derivatives having styryl or phenyl groups were synthesized, and their spectroscopic and electrochemical properties were investigated. Organic field-effect transistor (OFET) devices using these derivatives exhibited typical p-type FET characteristics, though the core units of both molecules were not aromatic compounds.View full abstract -
Mi Yeon Lee, Jung Yup Lee, Won Jin Lee, So Yeon Kim, Young Ho Park, Ta ...2013 Volume 42 Issue 6 Pages 649-650
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
JOURNAL RESTRICTED ACCESSHighly conductive silver (Ag) film on poly(ethylene terephthalate) (PET) substrate was prepared by using room-temperature sinterable silver nanoparticle (AgNP) ink having TiO2 nanoparticles as photodecomposition catalysts. AgNP-40T ink having TiO2 nanoparticles (1 wt %) successfully produced Ag film with a conductivity up to 5.2% of that of bulk silver, after ultraviolet (UV) irradiation for 1 h. The photodecomposition of poly(N-vinylpyrrolidone) (PVP) ligands by TiO2 during UV irradiation might contribute to facile room-temperature sintering of AgNP-40T ink.View full abstract -
Kazunori Togashi, Yuta Sagara, Takuma Yasuda, Chihaya Adachi2013 Volume 42 Issue 6 Pages 651-653
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 18, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialTwo novel electron-transport materials (ETMs), 2,3′-Bpy-TP and 2,4′-Bpy-TP, with high horizontal molecular orientation to substrates, were synthesized. It was shown by measuring the IR absorption spectra of their deposited thin films that C–H···N hydrogen bonds are formed between the 2,3′-Bpy-TP molecules and between the 2,4′-Bpy-TP molecules. It was also shown that there is a closed relationship between their molecular orientations and the driving voltages of electron-only devices (EODs) using them as electron-transport layers (ETLs).View full abstract -
Katsumasa Nakahara, Chikahiko Mitsui, Toshihiro Okamoto, Masakazu Yama ...2013 Volume 42 Issue 6 Pages 654-656
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 18, 2013JOURNAL RESTRICTED ACCESS
Supplementary materialWe focus on aggregated structures and charge-transporting properties in semiconductor assemblies of a new-type twisted π-conjugated molecule, dinaphtho[2,1-b:1′,2′-d]furan (DNF-U). Single crystals were successfully grown by physical vapor transport to form a two-dimensional herringbone packing structure, which is advantageous for intermolecular charge transport. Based on the packing structure, relatively large transfer integrals were theoretically calculated to be 20 and 57 meV for C–H···π and π···π direction, respectively. The single-crystal field-effect transistors exhibited notable hole mobility of up to 1.0 cm2 V−1 s−1.View full abstract -
Kohei Ide, Toshiyuki Sato, Jun Aoi, Hiroyuki Do, Keiichi Kobayashi, Yu ...2013 Volume 42 Issue 6 Pages 657-659
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 15, 2013JOURNAL RESTRICTED ACCESSl-Menthyl α-D-glucopyranosyl-(1→4)-α-D-glucopyranoside (l-α-MenG2), an α-maltoside of l-menthol, was synthesized through a three-step enzymatic reaction. We found that l-α-MenG2 possesses the properties of a low-molecular-weight gelator. Aqueous solutions containing l-α-MenG2 at concentrations above 30 g L−1 show a thermally reversible sol–gel transition. The sol–gel transition temperature of the aqueous l-α-MenG2 solution increases with l-α-MenG2 concentration: 12 °C at 30 g L−1 and 24 °C at 250 g L−1. d-Menthyl and d-isomenthyl α-maltosides were also synthesized enzymatically, but their aqueous solutions showed no sol–gel transition.View full abstract
Editor’s Choice
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Takato Mitsudome, Motoshi Matoba, Masaaki Yamamoto, Tomoo Mizugaki, Ko ...2013 Volume 42 Issue 6 Pages 660-662
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 24, 2013JOURNAL OPEN ACCESSA highly dispersed core–shell silver nanoparticle–ceria nanocomposite catalyst (AgNP@CeO2-D) was prepared. The addition of bases was found to enhance the catalytic efficiency of AgNP@CeO2-D significantly in the chemoselective reduction of diverse unsaturated aldehydes to the corresponding unsaturated alcohols.View full abstract -
Kazuhide Yoshiyama, Yoshikazu Abe, Shuichi Hayase, Toshiki Nokami, Tos ...2013 Volume 42 Issue 6 Pages 663-665
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
Advance online publication: May 15, 2013JOURNAL OPEN ACCESS
Supplementary materialThe synergetic effect of amino acids and an ionic liquid, 1-butyl-2,3-dimethylimidazolium α-cetylpolyoxyethylene(10) ether sulfate (IL1), as coating materials on lipase was discovered: coating on lipase PS using a certain amino acid with IL1 was found to be very effective for accelerating the lipase-catalyzed transesterification of secondary alcohols while maintaining perfect enantioselectivity.View full abstract
Letter
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Takuya Hayashida, Takuya Kawashima, Daisuke Nii, Kazunari Ozasa, Kazuo ...2013 Volume 42 Issue 6 Pages 666-668
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
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Supplementary materialKelvin probe force microscopy (KPFM) of DNA–single-walled carbon nanotube (SWNT) hybrids was performed for the first time. KPFM images indicated that the hybrids had a negative surface potential relative to a Au–Pd alloy surface. In contrast, the surface potential of SWNTs modified with poly(ethylene glycol) (PEG–SWNTs) was positive even after they were wrapped by DNA. Modification with covalent bonding may have a significant effect on the potential. The results suggest a possible way to distinguish variously modified SWNTs through KPFM observation.View full abstract -
Katsuhiko Kanaizuka, Shigeta Yagyu, Azusa Kajikawa, Takayoshi Kakuta, ...2013 Volume 42 Issue 6 Pages 669-671
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
JOURNAL OPEN ACCESSTwo types of silver nanoparticle (Ag NP)–dye nanocomposite layers were prepared on an indium-tin oxide (ITO) transparent electrode, where porphyrins were fixed on the Ag NPs by chemical bonding through their carboxylate moieties or by hydrophobic interactions. Stable cathodic photocurrents were generated from the nanocomposite layer structures and were specifically enhanced by the overlap of the Q-band excitation of the porphyrins between 500 and 600 nm with the gap-mode plasmon band of the Ag NPs. The photocurrent efficiency of the chemical bonding system was significantly higher than that from the hydrophobic interaction system.View full abstract -
Yoshitaka Saga, Akane Maruko, Kana Sadaoka, Naoya Takahashi2013 Volume 42 Issue 6 Pages 672-674
Published: June 05, 2013
Released on J-STAGE: June 05, 2013
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Supplementary materialZinc methyl 131-deoxopyropheophorbide a, which lacked the 131-oxo group in the exo five-membered E-ring, exhibited faster demetalation kinetics than zinc methyl pyropheophorbide a under acidic conditions, indicating that the 13-keto group of chlorophyllous pigments was responsible for resistance against removal of the central metal from the chlorin macrocycle.View full abstract
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