Pressure Effect on the Solvation of Tetraalkylammonium Ions in Water

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著者

    • Ueno M. UENO M.
    • Department of Molecular Science and Technology Faculty of Engineering, Doshisha University
    • YOSHIDA K.
    • Department of Molecular Science and Technology Faculty of Engineering, Doshisha University
    • IBUKI K.
    • Department of Molecular Science and Technology Faculty of Engineering, Doshisha University

抄録

In order to elucidate the pressure effect on the hydrophobic hydration shell, the limiting molar conductivities of tetraalkylammonium ions (Me<SUB>4</SUB>N<SUP>+</SUP> to Bu<SUB>4</SUB>N<SUP>+</SUP>) in H<SUB>2</SUB>O and D<SUB>2</SUB>O were determined at 5°C as a function of pressure up to 196. 1 MPa. The rotational correlation times of D<SUB>2</SUB>O molecules in pure D<SUB>2</SUB>O (τ<SUB>c</SUB><SUP>0</SUP>) and coordinated to Me<SUB>4</SUB>N<SUP>+</SUP> and Bu<SUB>4</SUB>N<SUP>+</SUP> ions (τ<SUB>c</SUB>) were also estimated at 6. 9°C up to 294. 2 MPa from <SUP>2</SUP>H NMR spin-lattice relaxation times (T<SUB>1</SUB>). The residual friction coefficient (Δζ<SUB>obs</SUB>) obtained from the limiting molar conductivity of the ion (λ<SUP>0</SUP>) became larger with increasing ionic radius and pressure except for Pr<SUB>4</SUB>N<SUP>+</SUP> and Bu<SUB>4</SUB>N<SUP>+</SUP> ions in D<SUB>2</SUB>O at lower pressure. These results suggest that the structure of the hydrophobic hydration shell is not weakened by pressure as much as that of bulk water, which is in qualitative agreement with the pressure dependence of τ<SUB>c</SUB> (Bu<SUB>4</SUB>N<SUP>+</SUP>) /τ<SUB>c</SUB><SUP>0</SUP>. However, a larger value of τ<SUB>c</SUB> (Me<SUB>4</SUB>N<SUP>+</SUP>) than that of τ<SUB>c</SUB><SUP>0</SUP> does not always correspond to a negative value of Δζ<SUB>obs</SUB> (Me<SUB>4</SUB>N<SUP>+</SUP>) indicating a structure breaking property of this ion.

収録刊行物

  • 高圧力の科学と技術 = The Review of high pressure science and technology  

    高圧力の科学と技術 = The Review of high pressure science and technology 7, 1162-1164, 1998 

    The Japan Society of High Pressure Science and Technology

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各種コード

  • NII論文ID(NAID)
    10002693209
  • NII書誌ID(NCID)
    AN10452913
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    0917639X
  • NDL 記事登録ID
    4494178
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z17-1589
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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