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Journal Articles

Pulse radiolysis study of ion-species effects on the solvated electron in alkylammonium ionic liquids

Kondo, Takafumi*; Asano, Akira*; Yang, J.*; Norizawa, Kimihiro*; Takahashi, Kenji*; Taguchi, Mitsumasa; Nagaishi, Ryuji; Kato, Ryuji*; Yoshida, Yoichi*

Radiation Physics and Chemistry, 78(12), p.1157 - 1160, 2009/12

https://doi.org/10.1016/j.radphyschem.2009.07.004
 Times Cited Count：28 Percentile：85.84(Chemistry, Physical)

Spectrum and kinetic behavior of solvated electrons (e$$_{sol}$$$$^{-}$$) in alkyl ammonium ionic liquids (ILs), ${it i.e.}$ DEMMA-TFSI, DEMMA-BF4, TMPA-TFSI, PP13-TFSI, P13-TFSI and P14-TFSI were investigated by pulse radiolysis method. The e$$_{sol}$$$$^{-}$$ in the ILs have same absorption peak at 1100 nm with a molar absorption coefficient of 1.5-2.3$$times$$10$$^{4}$$ dm$$^{3}$$mol$$^{-1}$$cm$$^{-1}$$. The reaction rate constant of e$$_{sol}$$$$^{-}$$ with Pyrene (Py) was 1.5-3.5$$times$$10$$^{8}$$ dm$$^{3}$$mol$$^{-1}$$s$$^{-1}$$. These values were about one order of magnitude higher than that of diffusion controlled limit, which was calculated from measured viscosity. The dry electron (e$$_{dry}$$$$^{-}$$) reacts with Py, and its rate constant in DEMMA-TFSI was 7.9$$times$$10$$^{11}$$ dm$$^{3}$$mol$$^{-1}$$s$$^{-1}$$, three orders of magnitude higher than that of the e$$_{sol}$$$$^{-}$$ reactions.

Journal Articles

Molar absorption coefficient and radiolytic yield of solvated electrons in diethylmethyl(2-methoxy)ammonium bis (trifluoromethanesulfonyl)imide ionic liquid

Asano, Akira*; Yang, J.*; Kondo, Takafumi*; Norizawa, Kimihiro*; Nagaishi, Ryuji; Takahashi, Kenji*; Yoshida, Yoichi*

Radiation Physics and Chemistry, 77(10-12), p.1244 - 1247, 2008/10

https://doi.org/10.1016/j.radphyschem.2008.05.032
 Times Cited Count：25 Percentile：82.53(Chemistry, Physical)

The molar extinction coefficient and the radiolytic yield of solvated electrons in ionic liquid of DEMMA-TFSI were estimated respectively to be 2.3$$times$$10$$^{4}$$ L mol$$^{-1}$$ cm$$^{-1}$$ and 0.8$$times$$10$$^{-7}$$ mol J$$^{-1}$$ by observing the reaction and kinetics of solvated electron and dry electron in the ionic liquid. The solvated electron in DEMMA-TFSI has a very broad absorption spectrum peaking at 1100 nm and reacts slowly with pyrene with a rate constant of 3.5$$times$$10$$^{8}$$ L mol$$^{-1}$$ s$$^{-1}$$, while the dry electron is captured rapidly by pyrene with C$$_{37}$$ value of 0.065 mol L$$^{-1}$$.

Journal Articles

Picosecond pulse radiolysis; Dynamics of solvated electrons in ionic liquid and geminate ion recombination in liquid alkanes

Yang, J.*; Kondo, Takafumi*; Norizawa, Kimihiro*; Nagaishi, Ryuji; Taguchi, Mitsumasa; Takahashi, Kenji*; Kato, Ryuji*; Anishchik, S. V.*; Yoshida, Yoichi*; Tagawa, Seiichi*

Radiation Physics and Chemistry, 77(10-12), p.1233 - 1238, 2008/10

https://doi.org/10.1016/j.radphyschem.2008.05.031
 Times Cited Count：25 Percentile：82.53(Chemistry, Physical)

First observation of picosecond dynamics in ionic liquid of DEMMA-TFSI in radiation chemistry was reported. It is found that the electron produced by ionization is solvated to full solvation in ionic liquid with a rate constant of 3.9$$times$$10$$^{10}$$ s$$^{-1}$$. The yield of solvated electrons in picosecond time region is 1.2$$times$$10$$^{-7}$$ mol J$$^{-1}$$. The dry electron in ionic liquid reacts rapidly with biphenyl and pyrene with a rate constant of 3.8 to 7.9$$times$$10$$^{11}$$ L mol$$^{-1}$$ s$$^{-1}$$. The geminate ion recombination in n-dodecane and n-hexane was also observed by monitoring the transient absorptions at 523 nm.

Oral presentation

Extension of heavy ion pulse radiolysis system using scintillator

Kondo, Takafumi*; Yang, J.*; Kan, Koichi*; Norizawa, Kimihiro*; Shibata, Hiromi*; Taguchi, Mitsumasa; Kurashima, Satoshi; Hirota, Koichi

no journal, , 

no abstracts in English

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