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Neutron Diffraction Study on the Structure of Aqueous LiNO3 Solutions

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Abstract

Neutron diffraction measurements were carried out at 25 °C for aqueous LiNO3 heavy water solutions, (*LiNO3) x (D2O)1−x where x = 0.1, 0.05 and 0.01, in which the 6Li/7Li isotopic ratios were varied. Structural information on intermolecular nearest neighbor Li+···D2O interactions in the extensive concentration range was derived from the first-order difference function, ∆Li(Q), obtained from the difference in scattering cross sections between 6Li- and 7Li-enriched sample solutions. The nearest neighbor Li+···O distance and coordination number for sample solution with x = 0.1 were determined to be r LiO = 1.969 (8) Å and n LiO = 4.12 (6), respectively, corresponding to the four-coordinated Li+ ion in the solution. On the other hand, those obtained for the solution with x = 0.01 are r LiO = 2.00 (2) Å and n LiO = 6.0 (2), respectively, indicating that hexaaqua Li+ is dominant in the dilute solution. These results clearly indicate that a concentration dependence of the hydration number of Li+ occurs in the aqueous solutions.

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Acknowledgments

The authors would like to thank the instrumental staff members of the NOVA spectrometer for their help during the course of neutron diffraction measurement and transformation of the scattering data. The neutron scattering experiment was approved by the Neutron Scattering Program Advisory Committee of IMSS, KEK (Proposal No. 2009S06).

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Authors and Affiliations

  1. Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata, Yamagata, 990-8560, Japan

    Yasuo Kameda, Takuya Miyazaki, Yuko Amo & Takeshi Usuki

  2. Institute of Material Structure Science, KEK, Tsukuba, Ibaraki, 305-0801, Japan

    Toshiya Otomo

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  1. Yasuo Kameda
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  2. Takuya Miyazaki
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  5. Takeshi Usuki
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Correspondence to Yasuo Kameda.

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Kameda, Y., Miyazaki, T., Otomo, T. et al. Neutron Diffraction Study on the Structure of Aqueous LiNO3 Solutions. J Solution Chem 43, 1588–1600 (2014). https://doi.org/10.1007/s10953-014-0223-y

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  • DOI: https://doi.org/10.1007/s10953-014-0223-y

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