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Variation in the Liquid Structure of Water Upon Dissolution of Aprotic Polar Organic Compounds as Studied by Near-Infrared Spectroscopy

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Abstract

Near-infrared absorption spectra obtained for aqueous solutions of eight aprotic organic compounds at concentrations up to 10% molar fraction were analyzed in detail using principal component analysis to determine the variation in the hydrogen-bonded network of water upon dissolution of the compounds. The shape of the overtone band of the O–H stretching mode, which is a sensitive indicator of the condition of the hydrogen-bonded network, was observed to vary with concentration and temperature. Principal component analyses revealed that all observed spectral variations consisted mainly of two components. The first component was similar to that observed for pure water upon a temperature change. The second component contributed to an increase in absorption intensity in the lower frequency region upon dissolution of any organic compound. This observation supports a model that involves the dissolution of an aprotic compound that generates ice-like aggregates of water molecules in the solution. In contrast, the contribution of the first component depends on the type of solute and its concentration; the first component contributes either to strengthening of the hydrogen-bonded network (similar to the change upon a temperature decrease) or to weaken it (similar to the change upon a temperature increase).

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Funding

This study was funded solely by Tokyo University of Agriculture and Technology.

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Authors and Affiliations

  1. Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8, Saiwai-cho, Fuchu, Tokyo, 183-8509, Japan

    Sayaka Katsu

  2. United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8, Saiwai-cho, Fuchu, Tokyo, 183-8509, Japan

    Norio Yoshimura & Masao Takayanagi

Authors
  1. Sayaka Katsu
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  2. Norio Yoshimura
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  3. Masao Takayanagi
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Correspondence to Masao Takayanagi.

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Katsu, S., Yoshimura, N. & Takayanagi, M. Variation in the Liquid Structure of Water Upon Dissolution of Aprotic Polar Organic Compounds as Studied by Near-Infrared Spectroscopy. J Solution Chem 47, 1202–1213 (2018). https://doi.org/10.1007/s10953-018-0784-2

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  • DOI: https://doi.org/10.1007/s10953-018-0784-2

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