Search

Your search keyword '"Tsuzuki, Seiji"' showing total 976 results
Start Over Author "Tsuzuki, Seiji"
976 results on '"Tsuzuki, Seiji"'

203. Li+ Local Structure in Li–Tetraglyme Solvate Ionic Liquid Revealed by Neutron Total Scattering Experiments with the 6/7Li Isotopic Substitution Technique

Author

Saito, Soshi, primary, Watanabe, Hikari, additional, Hayashi, Yutaka, additional, Matsugami, Masaru, additional, Tsuzuki, Seiji, additional, Seki, Shiro, additional, Canongia Lopes, José N., additional, Atkin, Rob, additional, Ueno, Kazuhide, additional, Dokko, Kaoru, additional, Watanabe, Masayoshi, additional, Kameda, Yasuo, additional, and Umebayashi, Yasuhiro, additional

Published
2016
Full Text
View/download PDF

214. Direct <italic>N</italic>‐Glycofunctionalization of Amides with Glycosyl Trichloroacetimidate by Thiourea/Halogen Bond Donor Co‐Catalysis.

Author

Kobayashi, Yusuke, Nakatsuji, Yuya, Li, Shanji, Tsuzuki, Seiji, and Takemoto, Yoshiji

Subjects
AMIDES, GLYCOSIDES, SACCHARIDES, HALOGEN compounds, THIOUREA, COUPLING reactions (Chemistry)
Abstract

Abstract: Using a halogen bond (XB) donor and Schreiner's thiourea as cooperative catalysts, various amides, including the asparagine residues of several peptides, were directly coupled with glycosyl trichloroacetimidates to give unique N‐acylorthoamides in good yields. Synthetic applications of N‐acylorthoamides, including rearrangement to the corresponding β‐N‐glycoside, were also demonstrated. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

220. Li+ solvation in glyme–Li salt solvate ionic liquids

Author

Ueno, Kazuhide, primary, Tatara, Ryoichi, additional, Tsuzuki, Seiji, additional, Saito, Soshi, additional, Doi, Hiroyuki, additional, Yoshida, Kazuki, additional, Mandai, Toshihiko, additional, Matsugami, Masaru, additional, Umebayashi, Yasuhiro, additional, Dokko, Kaoru, additional, and Watanabe, Masayoshi, additional

Published
2015
Full Text
View/download PDF

227. On the anion dependence of 1-butyl-3-methylimidazolium conformational isomerism studied by Raman spectroscopy, ab initio calculations and MD simulations

Author

Umebayashi, Yasuhiro, Fujii, Kenta, Ishiguro, Shin-Ichi, Kanzaki, Ryo, Canongia Lopes, José, Padua, Agilio A. H., Takeuchi, Munetaka, Tsuzuki, Seiji, Yamagushi, T., Department of Chemistry, Kyushu University [Fukuoka], Centro de Quimica Estrutural (CQE), Instituto Superior Técnico, Universidade Técnica de Lisboa (IST), Thermodynamique des solutions et des polymères (TSP), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Centre National de la Recherche Scientifique (CNRS), Kyushu University, and Padua, Agilio

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry, ComputingMethodologies_GENERAL
Abstract

poster

Published
2009

228. Effect of the cation on the stability of cation–glyme complexes and their interactions with the [TFSA]− anion.

Author

Tsuzuki, Seiji, Mandai, Toshihiko, Suzuki, Soma, Shinoda, Wataru, Nakamura, Takenobu, Morishita, Tetsuya, Ueno, Kazuhide, Seki, Shiro, Umebayashi, Yasuhiro, Dokko, Kaoru, and Watanabe, Masayoshi

Abstract

The interactions of glymes with alkali or alkaline earth metal cations depend strongly on the metal cations. For example, the stabilization energies (Eform) calculated for the formation of cation–triglyme (G3) complexes with Li+, Na+, K+, Mg2+, and Ca2+ at the MP2/6-311G** level were −95.6, −66.4, −52.5, −255.0, and −185.0 kcal mol−1, respectively, and those for the cation–tetraglyme (G4) complexes were −107.7, −76.3, −60.9, −288.3 and −215.0 kcal mol−1, respectively. The electrostatic and induction interactions are the major source of the attraction in the complexes; the contribution of the induction interactions to the attraction is especially significant in the divalent cation–glyme complexes. The binding energies of the cation–G3 complexes with Li+, Na+, K+, Mg2+, and Ca2+ and the bis(trifluoromethylsulfonyl)amide anion ([TFSA]−) were −83.9, −86.6, −80.0, −196.1, and −189.5 kcal mol−1, respectively, and they are larger than the binding energies of the corresponding cation–G4 complexes (−73.6, −75.0, −77.4, −172.1, and −177.2 kcal mol−1, respectively). The binding energies and conformational flexibility of the cation–glyme complexes also affect the melting points of equimolar mixtures of glyme and TFSA salts. Furthermore, the interactions of the metal cations with the oxygen atoms of glymes significantly decrease the HOMO energy levels of glymes. The HOMO energy levels of glymes in the cation–glyme–TFSA complexes are lower than those of isolated glymes, although they are higher than those of the cation–glyme complexes. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

241. Glyme–Sodium Bis(fluorosulfonyl)amide Complex Electrolytes for Sodium Ion Batteries

Author

Terada, Shoshi, Susa, Hiroko, Tsuzuki, Seiji, Mandai, Toshihiko, Ueno, Kazuhide, Dokko, Kaoru, and Watanabe, Masayoshi

Abstract

The physicochemical and electrochemical properties of an equimolar complex of pentaglyme (G5) and sodium bis(fluorosulfonyl)amide (NaFSA), [Na(G5)][FSA], mixed with a hydrofluoroether (HFE) were investigated. Ab initiocalculations and Raman spectroscopy showed that the coordination structure of [Na(G5)][FSA] was similar to that of [Na(G5)][TFSA] (TFSA: bis(trifluoromethanesulfonyl)amide). The ligand G5 remained coordinated to Na+and was not liberated from the cationic [Na(G5)]+complex even in the presence of HFE. The charge transport property was greater in [Na(G5)][FSA]/HFE than in [Na(G5)][TFSA]/HFE. A prominent difference was found in the Na metal deposition/dissolution behavior. Highly reversible Na deposition/dissolution with a Coulombic efficiency (95%) could be achieved in [Na(G5)][FSA]/HFE; however, the reversibility in [Na(G5)][TFSA]/HFE was very low. X-ray photoelectron spectroscopy (XPS) of the deposited Na metal in each electrolyte revealed that a thin and compact layer of electrolyte decomposition products was formed on the Na deposits in [Na(G5)][FSA]/HFE. The FSA-derived thin layer can effectively inhibit the further decomposition of the electrolyte. By contrast, a thick electrolyte decomposition product found for [Na(G5)][TFSA]/HFE suggested continuous decomposition of the electrolyte during Na deposition-dissolution. Highly stable charge and discharge of a hard carbon (HC) electrode was accomplished in [Na(G5)][FSA]/HFE, with high Coulombic efficiency over 99.9% and negligible capacity decrease over 300 cycles. Electrochemical impedance measurements of a symmetrical cell for Na, HC, and Na0.44MnO2electrodes with the above electrolytes verified that a stable electrode | electrolyte interface was formed on the HC and Na0.44MnO2electrodes in [Na(G5)][FSA]/HFE.

Published
2018
Full Text
View/download PDF

242. Physicochemical Properties and Electrochemical Behavior of Systematically Functionalized Aryltrifluoroborate-Based Room-Temperature Ionic Liquids

Author

Iwasaki, Kazuki, Tsuzuki, Seiji, Tsuda, Tetsuya, and Kuwabata, Susumu

Abstract

The physicochemical properties and electrochemical behavior of 1-butyl-3-methylimidazolium aryltrifluoroborate ([C4mim][ArBF3]) with various substituents, e.g., methoxy, fluoro, trifluoromethyl, and cyano groups, introduced on the phenyl moiety on the anion are examined. Several position isomers of the [ArBF3]−anion are also prepared to provide further insight into the effect of the position. The equivalent conductivity and the electrochemical stability for some [C4mim][ArBF3] room-temperature ionic liquids (RTILs) is qualitatively discussed from the results of quantum chemical calculations of the cation–anion interaction and the HOMO energy level of the anion. Interestingly, [C4mim][ArBF3] RTILs with an electron-withdrawing group on the phenyl moiety electrochemically form an ion-selective membrane on a Pt electrode, and only neutral and cationic species can pass through the membrane.

Published
2018
Full Text
View/download PDF

243. Density, Viscosity, Ionic Conductivity, and Self-Diffusion Coefficient of Organic Liquid Electrolytes: Part I. Propylene Carbonate + Li, Na, Mg and Ca Cation Salts

Author

Seki, Shiro, Hayamizu, Kikuko, Tsuzuki, Seiji, Takahashi, Keitaro, Ishino, Yuki, Kato, Masaki, Nozaki, Erika, Watanabe, Hikari, and Umebayashi, Yasuhiro

Abstract

To investigate physicochemical relationships between ionic radii, valence number and cationic metal species in electrolyte solutions, propylene carbonate with Li[N(SO2CF3)2], Na[N(SO2CF3)2], Mg[N(SO2CF3)2]2 and Ca[N(SO2CF3)2]2 were prepared. The temperature dependence of density, viscosity, ionic conductivity (AC impedance method) and self-diffusion coefficient (pulsed-gradient spin-echo nuclear magnetic resonance) was measured. The effects of cationic radii and cation valence number on the fluidity and transport properites (conductivity and self-diffusion coefficient) were analyzed.

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results