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Crystal structure of iron(III) perchlorate nona-hydrate.

Hennings E, Schmidt H, Voigt W - Acta Crystallogr Sect E Struct Rep Online (2014)

Bottom Line: 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).

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Affiliation: TU Bergakademie Freiberg, Institute of Inorganic Chemistry, Leipziger Strasse 29, D-09596 Freiberg, Germany.

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).

No MeSH data available.


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The unit cell of iron(III) perchlorate nona­hydrate with coordination polyhedra of the first (a) and second (b) coordination sphere. The minor disorder component of the ClO4 tetrahedron has been omitted for clarity. Dashed lines indicate hydrogen bonds.
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fig3: The unit cell of iron(III) perchlorate nona­hydrate with coordination polyhedra of the first (a) and second (b) coordination sphere. The minor disorder component of the ClO4 tetrahedron has been omitted for clarity. Dashed lines indicate hydrogen bonds.

Mentions: From the unit cell of ferric perchlorate nona­hydrate (Fig. 3 ▶a), it is obvious that the O4 atoms form a secondary hydration shell around the Fe(H2O)6 units. This becomes clearer when drawing the second octa­hedra as water coordination polyhedra (yellow, Fig. 3 ▶b). The water mol­ecules of the second coordination sphere are closer [4.143 (4) Å] to the Fe atom than the perchlorate tetra­hedra [4.271 (4) Å].


Crystal structure of iron(III) perchlorate nona-hydrate.

Hennings E, Schmidt H, Voigt W - Acta Crystallogr Sect E Struct Rep Online (2014)

The unit cell of iron(III) perchlorate nona­hydrate with coordination polyhedra of the first (a) and second (b) coordination sphere. The minor disorder component of the ClO4 tetrahedron has been omitted for clarity. Dashed lines indicate hydrogen bonds.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4257414&req=5

fig3: The unit cell of iron(III) perchlorate nona­hydrate with coordination polyhedra of the first (a) and second (b) coordination sphere. The minor disorder component of the ClO4 tetrahedron has been omitted for clarity. Dashed lines indicate hydrogen bonds.
Mentions: From the unit cell of ferric perchlorate nona­hydrate (Fig. 3 ▶a), it is obvious that the O4 atoms form a secondary hydration shell around the Fe(H2O)6 units. This becomes clearer when drawing the second octa­hedra as water coordination polyhedra (yellow, Fig. 3 ▶b). The water mol­ecules of the second coordination sphere are closer [4.143 (4) Å] to the Fe atom than the perchlorate tetra­hedra [4.271 (4) Å].

Bottom Line: 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).

View Article: PubMed Central - HTML - PubMed

Affiliation: TU Bergakademie Freiberg, Institute of Inorganic Chemistry, Leipziger Strasse 29, D-09596 Freiberg, Germany.

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).

No MeSH data available.


Related in: MedlinePlus