Study on dynamics of hydrated water molecules by high-pressure NMR spectroscopy

高压核磁共振波谱研究水合水分子动力学

• 批准号: 09640615
• 负责人: TANIGUCHI Yoshihiro
• 金额: $ 1.86万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640615/
• 关键词: NMR; Alkali bromide; Water molecules; Spin-lattice Relaxation Rates; Pressure; スピン-格子緩和速度; スピン-格子統和速度; アルカリ金属塩; 水和; 動的構造

The spin-lattice relaxation rates(RィイD21ィエD2) of D andィイD117ィエD1O nuclei of a heavy water (DィイD22ィエD2O) molecule in alkali bromide (LiBr, NaBr, KBr and CsBr) aqueous solutions were measured in the range of 0-1.0 molkgィイD1-1ィエD1, 10-50℃ and 0.1-300 MPa by NMR spectroscopy. In these solution, the RィイD21ィエD2 value varies linearly with concentration under constant temperature and constant pressure. Even under high pressure, R1 can be expressed as a weighed sum of the limiting relaxation rates in infinite dilution based on two-state model. The activation volume is estimated from pressure dependence of the rotational correlation times (τ) for the DィイD22ィエD2O molecule coordinated to alkali metal ions. It decreases with increasing radius of alkali metal ion and with increasing pressure at each temperature. The activation energy is estimated from temperature dependence of τ. It decreases with increasing radius of alkali metal ion and with increasing temperature even under high pressure.

用核磁共振波谱法测定了重水（D_（12）D_（22）O_（1 - 1）D_（117）D_（10）D_（1 - 1）O）核在碱金属溴化物（LiBr，NaBr，KBr和CsBr）水溶液中的自旋-晶格弛豫速率（R_（1 -1）D_（21）D_（2））。在恒温、恒压条件下，溶液的R_（？）D_（21）R_（？）D_（2）值与浓度呈线性关系。即使在高压下，R1也可以表示为基于两态模型的无限稀释极限弛豫速率的加权和。活化体积由与碱金属离子配位的D D22 D2 O分子的转动相关时间（τ）的压力依赖性估算。在每个温度下，它随碱金属离子半径的增加和压力的增加而减小。活化能由τ的温度依赖性估算。它随碱金属离子半径的增大和温度的升高而减小，即使在高压下也是如此。

项目成果

K.Fumino, A.Shimizu and Y.Taniguchi: "Pressure effects on the spin-lattice relaxation rates of D and ^<17>0 naclei for heavy water molecules in alkali bromide aqueous sclutions by NMR spectroscopy" Journal of Molecular Liquids.

K.Fumino、A.Shimizu 和 Y.Taniguchi：“压力对碱金属溴化物水溶液中重水分子的 D 和 ^ 17>0 核的自旋晶格弛豫率的影响，通过 NMR 光谱进行”，《分子液体杂志》。

Koichi Fumino, Akio Shimizu and Yoshihiro Taniguchi: "Pressure Effects on the Spin-lattice relaxation Rates of D andィイD117ィエD1O Nuclei for Heavy Water Molecules in Alkali Bromide Aqueous Solutions"Journal of Molecular Liquids. 82. 219-230 (1999)

Koichi Fumino、Akio Shimizu 和 Yoshihiro Taniguchi：“压力对碱溴化物水溶液中重水分子 D117D1O 核自旋晶格弛豫率的影响”分子液体杂志 82. 219-230 (1999)。

T.Nakai, S.Sawamura, Y.Taniguchi, T.Kuboyama: "Effect of pressure on the viscosity B coefficient for potassium chloride in water" Materials Science Research International. 3. 204-209 (1997)

T.Nakai、S.Sawamura、Y.Taniguchi、T.Kuboyama：“压力对水中氯化钾粘度 B 系数的影响”材料科学研究国际。

K.Fumino, A.Shimizu, Y.Taniguchi: "Concentration dependence of nuclear magnetic relaxation rates of alkalimetal Tonic nuclee in dilute solutions" DENKI KAGAKU. 65. 198-203 (1997)

K.Fumino、A.Shimizu、Y.Taniguchi：“稀溶液中碱金属补强核的核磁弛豫率的浓度依赖性”电气化学。

K.Shigematsu, Y.Takahashi, T.Sawada, K.Takemura, Y.Taniguchi, S.Sawamura, T.Tomobe, K.Kawasaki, M.Koyama: "High-definition microscopy of pressure-induced NaCl-CsCl transtion in RbCl." Jpn.J.Appl.Phys.36. L142-L145 (1997)

K.Shigematsu、Y.Takahashi、T.Sawada、K.Takemura、Y.Taniguchi、S.Sawamura、T.Tomobe、K.Kawasaki、M.Koyama：“压力诱导的 NaCl-CsCl 转变的高清显微镜