Abstract
Since the discovery of perchlorate salts on Mars and the known occurrence of ferric salts in the regolith, there is a distinct possibility that the title compound could form on the surface of Mars. [Fe(H2O)6](ClO4)3·3H2O was crystallized from aqueous solutions at low temperatures according to the solid-liquid phase diagram. It consists of Fe(H2O)6 octa-hedra (point group symmetry -3.) and perchlorate anions (point group symmetry .2) as well as non-coordinating water mol-ecules, as part of a second hydrogen-bonded coordination sphere around the cation. The perchlorate appears to be slightly disordered, with major-minor component occupancies of 0.773 (9):0.227 (9).
Highlights
Chemical contextSupporting information: this article has supporting information at journals.iucr.org/e
Since the discovery of perchlorate salts on Mars and the known occurrence of ferric salts in the regolith, there is a distinct possibility that the title compound could form on the surface of Mars. [Fe(H2O)6](ClO4)33H2O was crystallized from aqueous solutions at low temperatures according to the solid–liquid phase diagram
It consists of Fe(H2O)6 octahedra and perchlorate anions as well as non-coordinating water molecules, as part of a second hydrogen-bonded coordination sphere around the cation
Summary
Supporting information: this article has supporting information at journals.iucr.org/e. Since the discovery of perchlorate salts on the surface of Mars during the Phoenix expedition (Hecht et al, 2009; Davila et al., 2013; Kerr, 2013; Marion et al, 2010; Navarro-González et al., 2010), interest in the solubility and crystal structures of the perchlorate hydrate phases became more important (Chevrier, Hanley & Altheide, 2009; Catling et al, 2010). Based on the red color of the planet, one can expect different iron phases, such as perchlorate and sulfate, to be important constituents of the regolith (Chevrier, Ulrich & Altheide, 2009; Chevrier & Altheide, 2008; Hennings et al, 2013). While investigating the solubility of ferric perchlorate, we obtained the nonahydrate as a stable phase in the binary salt–water system
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