Abstract
A comparison of the Raman spectra of ferric chloride hexahydrate (FCHH) in 11·5M HCl solution at 298 and 165K has shown that the FeCl 4 − ions, which are the most prominent species in the highly acidic FCHH solution, get converted into polymeric species, composed of higher chloro-ferrate octahedral groups of the type FeCl 5 2−·H 2O and FeCl 6 3−. The Raman spectra of the frozen FCHH in 11·5M HCl and in 3M HCl are similar, indicating the similarity of structures of the polymeric species present in the two frozen solutions. The observed similarity between the Raman spectrum of FCHH in 3M HCl at 298 and 165K suggests that on freezing the solution transforms into glass without any appreciable structural changes.
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