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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 connection scheme of water mol­ecules of the second coordination sphere by hydrogen bonds (a) and the formation of a secondary hydration shell (yellow) around the cations (b). The minor disorder component of the ClO4 tetrahedron has been omitted for clarity. Dashed lines indicate hydrogen bonds. [Symmetry code: (i)  − x,  − x + y,  − z.]
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fig2: The connection scheme of water mol­ecules of the second coordination sphere by hydrogen bonds (a) and the formation of a secondary hydration shell (yellow) around the cations (b). The minor disorder component of the ClO4 tetrahedron has been omitted for clarity. Dashed lines indicate hydrogen bonds. [Symmetry code: (i)  − x,  − x + y,  − z.]

Mentions: The central Fe atom is situated on a threefold inversion axis and is octa­hedrally coordinated by six water mol­ecules in the first, and by six water mol­ecules as well as six perchlorate tetra­hedra in the second coordination spheres (Fig. 1 ▶). The water mol­ecules of the second coordination sphere (O4 and symmetry equivalents) are connected to perchlorate tetra­hedra (Fig. 2 ▶a) via hydrogen bonds (Table 1 ▶). Six O4-water mol­ecules form a second, larger octa­hedron outside the octa­hedron of the first coordination shell (Fig. 2 ▶b). The perchlorate anion, situated on a twofold rotation axis, appears to be slightly disordered, with major:minor component occupancies of 0.773 (9):0.227 (9).


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

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

The connection scheme of water mol­ecules of the second coordination sphere by hydrogen bonds (a) and the formation of a secondary hydration shell (yellow) around the cations (b). The minor disorder component of the ClO4 tetrahedron has been omitted for clarity. Dashed lines indicate hydrogen bonds. [Symmetry code: (i)  − x,  − x + y,  − z.]
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig2: The connection scheme of water mol­ecules of the second coordination sphere by hydrogen bonds (a) and the formation of a secondary hydration shell (yellow) around the cations (b). The minor disorder component of the ClO4 tetrahedron has been omitted for clarity. Dashed lines indicate hydrogen bonds. [Symmetry code: (i)  − x,  − x + y,  − z.]
Mentions: The central Fe atom is situated on a threefold inversion axis and is octa­hedrally coordinated by six water mol­ecules in the first, and by six water mol­ecules as well as six perchlorate tetra­hedra in the second coordination spheres (Fig. 1 ▶). The water mol­ecules of the second coordination sphere (O4 and symmetry equivalents) are connected to perchlorate tetra­hedra (Fig. 2 ▶a) via hydrogen bonds (Table 1 ▶). Six O4-water mol­ecules form a second, larger octa­hedron outside the octa­hedron of the first coordination shell (Fig. 2 ▶b). The perchlorate anion, situated on a twofold rotation axis, appears to be slightly disordered, with major:minor component occupancies of 0.773 (9):0.227 (9).

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