Abstract
Interest in highly concentrated aqueous solutions, in which all or most of the water is directly bound to ions, is relatively recent and has focused to a large extent on hydration coordination numbers and the extent to which cation-bound hydration water molecules are replaced by anions. For example, infrared and Raman spectroscopy of nitrate vibrations in nitrate melts1,2 have provided evidence that the nitrate ion competes effectively with water for the first coordination shell of Ca2+ in Ca(NO3)2 3 solutions and their mixtures with KNO3.4 From the relative intensities of vibrational absorptions due to cation-perturbed and -unperturbed anion normal modes, equilibrium constants can be estimated for water-anion exchange.
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Hodge, I.M., Angell, C.A. (1981). Nonvibrational Nondiffusional Modes of Motion in Hydrated Calcium Nitrate Melts. In: Inman, D., Lovering, D.G. (eds) Ionic Liquids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0920-9_3
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