Properties of Water Confined in Ionic Liquids

被引：0
作者：
Koji Saihara
Yukihiro Yoshimura
Soichi Ohta
Akio Shimizu
机构：
[1] Soka University,Department of Environmental Engineering for Symbiosis
[2] National Defense Academy,Department of Applied Chemistry
来源：
Scientific Reports | / 5卷
关键词：
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The varying states of water confined in the nano-domain structures of typical room temperature ionic liquids (ILs) were investigated by 1H NMR and by measurements of self-diffusion coefficients while systematically varying the IL cations and anions. The NMR peaks for water in BF4-based ILs were clearly split, indicating the presence of two discrete states of confined water (H2O and HOD). Proton and/or deuterium exchange rate among the water molecules was very slowly in the water-pocket. Notably, no significant changes were observed in the chemical shifts of the ILs. Self-diffusion coefficient results showed that water molecules exhibit a similar degree of mobility, although their diffusion rate is one order of magnitude faster than that of the IL cations and anions. These findings provide information on a completely new type of confinement, that of liquid water in soft matter.
引用
收藏
相关论文
共 81 条
  • [1] Welton T(1999)Room-temperature ionic liquids. Solvents for synthesis and catalysis Chem. Rev. 99 2071-2084
  • [2] Sato T(2004)Electrochemical properties of novel ionic liquids for electric double layer capacitor applications Electrochim. Acta 49 3603-3611
  • [3] Matsuda G(2006)Ionic liquids as electrolytes Electrochim. Acta 51 5567-5580
  • [4] Takagi K(2006)The distillation and volatility of ionic liquids Nature 439 831-834
  • [5] Galinski M(2007)Nanoscale segregation in room temperature ionic liquids J. Phys. Chem. B 111 4641-4644
  • [6] Lewandwski A(2004)Structure of ionic liquids of 1-alkyl-3-methylimidazolium cations: A systematic computer simulation study J. Chem. Phys 120 1855-1863
  • [7] Stepniak I(2005)Unique spatial heterogeneity in ionic liquids J. Am. Chem. Soc 27 12192-12193
  • [8] Earle. MJ(2006)Nanostructural organization in ionic liquids J. Phys. Chem. B 110 3330-3335
  • [9] Triolo A(2009)Morphology and intermolecular dynamics of 1-alkyl-3-methylimidazolium bis{(trifluoromethane)sulfonyl}amide ionic liquids: structural and dynamic evidence of nanoscale segregation J. Phys.: Condens. Matter 21 424121-4818
  • [10] Russina O(2007)Molecular dynamics simulation of nanostructural organization in ionic liquid/water mixtures J. Phys. Chem. B 111 4812-7851
123456789