Isotope effects on the reorientational motion of hydrated H2O molecules in alkali metal bromide dilute aqueous solutions studied by NMR spectroscopy.
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概要
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The spin-lattice relaxation times of <SUP>1</SUP>H and <SUP>17</SUP>O nuclei of hydrated H<SUB>2</SUB>O molecules in alkali metal bromide (LiBr, NaBr, KBr, and CsBr) dilute aqueous solutions in the concentration range from 0.2 to 1.0 mol kg<SUP>−1</SUP> at 25 °C were measured by NMR spectroscopy. The reorientational correlation times for the intramolecular <SUP>1</SUP>H–<SUP>1</SUP>H (τ<SUB>HH</SUB><SUP>+</SUP>) and <SUP>1</SUP>H–<SUP>17</SUP>O (τ<SUB>OH</SUB><SUP>+</SUP>) axes, as well as the perpendicular axis (<SUP>17</SUP>O nuclei, τ<SUB><SUP>17</SUP>O</SUB><SUP>+</SUP>) to the molecular plane of a hydrated H<SUB>2</SUB>O molecule were determied. The two reorientational correlation times (τ<SUB>HH</SUB><SUP>+</SUP> and τ<SUB>OH</SUB><SUP>+</SUP>) of pure H<SUB>2</SUB>O and hydrated H<SUB>2</SUB>O molecules in Li<SUP>+</SUP>, Na<SUP>+</SUP>, K<SUP>+</SUP>, and Cs<SUP>+</SUP> ions were equal, respectively. Comparing previous data for hydrated D<SUB>2</SUB>O molecules with that calculated by using correction values (<I>r</I><SUB>HH</SUB>, <I>r</I><SUB>OH</SUB>, and quadrupolar constant) for H<SUB>2</SUB>O molecules, the ratios of τ<SUB>D</SUB><SUP>+</SUP>(D<SUB>2</SUB>O)/τ<SUB>OH</SUB>(H<SUB>2</SUB>O) and τ<SUB><SUP>17</SUP>O</SUB><SUP>+</SUP>(D<SUB>2</SUB>O)/τ<SUB><SUP>17</SUP>O</SUB><SUP>+</SUP>(H<SUB>2</SUB>O) were found to be of the same order as η(D<SUB>2</SUB>O)/η(H<SUB>2</SUB>O), except for the τ<SUB><SUP>17</SUP>O</SUB><SUP>+</SUP>(D<SUB>2</SUB>O)/τ<SUB><SUP>17</SUP>O</SUB><SUP>+</SUP>(H<SUB>2</SUB>O) value for the Li<SUP>+</SUP> ion.
- 公益社団法人 日本化学会の論文
著者
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Taniguchi Yoshihiro
Department Of Applied Chemistry Faculty Of Science And Engineering Ritsumeikan University
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Shimizu Akio
Department of Bioengincering Facutly of Engineering,Soka University
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