A Raman study of aqueous solutions of ferric nitrate, ferrous chloride and ferric chloride in the glassy state

Raman spectra have been obtained for aqueous solutions of Fe(NO3)3, FeCl2 and FeCl3 in the glassy state where R = moles of water/moles of salt = 10–20. The predominant jonic species in these solutions are [Fe(H2O)6]3+, [Fe(H2O)6]2+ and trans‐ [Fecl2(H2O)4]+, respectively. The second dominant ferric species in the glassy FeCl3 solution (R = 20) seems to be the [FeCl(H2O)5]2+ ion, which is inferred from comparison of the frequencies of the FeOH2 stretching Raman bands.