Pressure and Temperature Effects on 2H-NMR Spin-Lattice Relaxation Times in TBA- and Urea-D2O Solutions.

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  • 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
  • Ueno M.
    Department of Molecular Science and Technology Faculty of Engineering, Doshisha University

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  • Pressure and Temperature Effects on 2H-

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The 2H NMR spin-lattice relaxation times (T1) of D2O molecules and the 1H chemical shifts (δ) of water in tert-butyl alcohol (TBA) -and urea-D2O solutions up to 8 mol% were measured at 7. 7, 29. 9, and 48. 4°C up to 294 MPa in order to elucidate the pressure and temperature effects on the hydrophobic hydration. The pressure coefficient of T1 in the TBA solution was smaller than that in pure water, and decreased monotonously with an increase in the TBA content. The δ (H2O) in the TBA solution exhibits a downfield shift relative to that in neat D2O and the difference in the δ (H2O) between TBA solution and neat D2O becomes larger with compression. These results suggest that the structure of the hydration shell is not so bulky as the tetrahedral open structure of water. On the other hand, the results in urea solutions were in marked contrast to those in TBA solutions.

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