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Asian Journal of Physics  Vol. 31 No 2, 2022, 365-373

Bromide hydration as a function of concentration and temperature
Letizia Scarabattoli, Lucia Comez and Paola Sassi

Abstract

In the fascinating world of the physico-chemical properties of water vibrational spectroscopy provides a powerful tool to unravel the complicated scenario of H-bonding structures. In this work, we used Raman spectroscopy to give an estimate of interactions and nearest-neighbour distances in water and KBr aqueous solutions. By H/D isotopic substitution and analysis of the OH/OD stretching regions, we followed the rearrangement of local structures in the proximity of bromide ions as a function of temperature, in the –30°C – 50°C temperature range, at different KBr concentrations. A more compact and interacting shell was recognized for the solution in the presence of ice, regardless of KBr concentration; however, both at high and low temperatures, a 20% lessening of H bonding enthalpy was estimated in water-bromide with respect to water-water interactions. This analysis of water properties in the bromide hydration shell below and above the melting range, gives a more comprehensive picture of the H bond network of water-electrolyte systems. ©Anita Publications. All rights reserved.
Keywords: Water, Electrolyte, Hydration, Raman spectroscopy.

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