Abstract
Ferric perchlorate solutions have been investigated by an X-ray scattering technique. The main features of the radial distribution functions are consistent with the presence of ClO 4 − ions and of hydrated Fe(H 2O) 6 3+ complexes in octahedral configuration. Structural parameters have been derived for these two species from the outermost parts of the reduced intensity functions. An hydrogen bonded structure outside the inner coordination sphere of iron(III) is strongly suggested by the presence of a large peak at 4 Å in the radial distribution curves. In this respect a comparison between iron(III) perchlorate and nitrate solutions has made possible to evidentiate a similar structural arrangement for Fe 3+ ions in both media. Some indications have been also obtained supporting the existence of an outer-sphere FeClO 4 complex and of hydration water around the perchlorate group.
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