Abstract
The Raman spectra of concentrated aqueous solutions of AlCl3 and MgCl2 in H2O and D2O have been obtained and the shapes of the Raman bands attributed to oscillations of the cation hydrates more accurately determined than in previous reports. Isotopic shifts have been interpreted using a model in which the Al3+ or Mg2+ cations are octahedrally coordinated by six water molecules and slightly perturbed by two neighbouring anions. Electrostatic interactions between ions and coordinated water molecules and between water molecules themselves were estimated. Preliminary results are also presented for aqueous solutions of BeCl2.
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