2007年2月
Slowdown of H/D exchange reaction rate and water dynamics in ionic liquids: Deactivation of solitary water solvated by small anions in 1-butyl-3-methyl-imidazolium chloride
JOURNAL OF PHYSICAL CHEMISTRY A
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- ,
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- 巻
- 111
- 号
- 4
- 開始ページ
- 541
- 終了ページ
- 543
- 記述言語
- 英語
- 掲載種別
- DOI
- 10.1021/jp0673720
- 出版者・発行元
- AMER CHEMICAL SOC
The H/D exchange reaction and the rotational dynamics of heavy water (D2O) are studied at 50 degrees C in the ionic liquid, 1-butyl-3-methylimidazolium chloride ([bmim][Cl]), in the [D2O] range of 3-55 M. The initial H/D exchange rates are observed as 1.0 x 10(-7), 4.5 x 10(-6), 1.0 x 10(-5), 4.1 x 10(-5), 1.1 x 10(-4), and 3.7 x 10(-4) s(-1), respectively, at [D2O] of 2.8, 7.1, 8.1, 11, 15, and 25 M. The rate is very slow and less than 10(-5) s(-1) at [ D2O] below similar to 7 M. It steeply increases to the order of 10(-4) s(-1) for 7 M < [D2O] < 10 M, and linearly increases with [D2O] in the more water-rich region. The intercept of the linear region at [D2O] = similar to 9 M is interpreted by considering that each chloride anion deactivates 1.6 equiv water molecules due to the strong solvation. Correspondingly, the rotational correlation time of D2O at [D2O] < 7 M is 1 order of magnitude larger than that in water-rich conditions.
- リンク情報
- ID情報
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- DOI : 10.1021/jp0673720
- ISSN : 1089-5639
- J-Global ID : 200902253293577622
- Web of Science ID : WOS:000243705200001