Neutron diffraction study of aqueous hydrochloric and hydrobromic acid solutions.
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概要
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The structure factors <I>S</I><SUB>m</SUB>(<I>Q</I>) over a wide range of <I>Q</I>(1.7–25 Å<SUP>−1</SUP>) for aqueous solutions of DC1 and DBr (<I>ca.</I> 1 M) at room temperature have been determined by means of LINAC-TOF neutron diffraction. The intramolecular structures of D<SUB>2</SUB>O and D<SUB>3</SUB>O<SUP>+</SUP> in the solutions are found to be identical with those in the "revised watery model" for water. Applying the subtraction method of analysis to diffraction data for the solutions, we have obtained the following results with respect to the structure of the nearest hydration shell around ions in the DCl and DBr solutions: (a) D<SUB>3</SUB>O<SUP>+</SUP> is tetrahedrally coordinated with four water molecules and Cl<SUP>−</SUP> and Br<SUP>−</SUP> are octa-hedrally coordinated with six ones, (b) the O–O distances between the central oxygen atom and that of hydrated water molecules for D<SUB>3</SUB>O<SUP>+</SUP> are 2.88±0.05 Å, (c) the anion-oxygen distances are 3.10±0.05 Å for Cl<SUP>−</SUP> and 3.21±0.05 Å for Br<SUP>−</SUP>, and (d) around cations (D<SUB>3</SUB>O<SUP>+</SUP>) water molecules take the configuration to orient the axis of one of the two lone-pair hybrids on a straight line joining an oxygen atom and the cation, while around anions (Cl<SUP>−</SUP> and Br<SUP>−</SUP>) those take the configuration to orient the vector which bisects the D–O–D angle on a straight line joining an oxygen atom and the cation.
- 公益社団法人 日本化学会の論文
著者
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Ohtomo Norio
Faculty Of Engineering Hokkaido University
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Ohtaki Hitoshi
Department Of Chemistry Faculty Of Science And Engineering Ritsumeikan University
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Arakawa Kiyoshi
Research Institute Of Applied Electricity Hokkaido University
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Takeuchi Makoto
Department Of Biology Faculty Of Science Okayama University
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Yamaguchi Toshio
Department of Chemical Engineering, Tokyo University of Agriculture and Technology
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Yamaguchi Toshio
Department of Electronic Chemistry, Tokyo Institute of Technology
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