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Crystal structure of [Co(NH3)6][Co(CO)4]2.

Müller TG, Kraus F - Acta Crystallogr E Crystallogr Commun (2015)

Bottom Line: The resulting polyhedron, the hexa-amminecobalt(II) cation, exhibits point group symmetry -3.The crystal structure is related to that of high-pressure BaC2 (space group R-3m), with the [Co(NH3)6](2+) cations replacing the Ba sites and the [Co(CO)4](-) anions replacing the C sites.N-H⋯O hydrogen bonds between cations and anions stabilize the structural set-up in the title compound.

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Affiliation: Anorganische Chemie, Fluorchemie, Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany.

ABSTRACT
Hexaamminecobalt(II) bis-[tetra-carbonyl-cobaltate(-I)], [Co(NH3)6][Co(CO)4]2, was synthesized by reaction of liquid ammonia with Co2(CO)8. The Co(II) atom is coordinated by six ammine ligands. The resulting polyhedron, the hexa-amminecobalt(II) cation, exhibits point group symmetry -3. The Co(-I) atom is coordinated by four carbonyl ligands, leading to a tetra-carbonyl-cobaltate(-I) anion in the shape of a slightly distorted tetra-hedron, with point group symmetry 3. The crystal structure is related to that of high-pressure BaC2 (space group R-3m), with the [Co(NH3)6](2+) cations replacing the Ba sites and the [Co(CO)4](-) anions replacing the C sites. N-H⋯O hydrogen bonds between cations and anions stabilize the structural set-up in the title compound.

No MeSH data available.


Reaction equation for the preparation of the title compound.
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fig3: Reaction equation for the preparation of the title compound.

Mentions: 86 mg (29.4 mmol) of Co2(CO)8 were placed in a flame-dried bomb tube under argon. 0.2 ml of liquid ammonia were condensed to the bomb tube. The bomb tube, now containing an orange solution, was flame-sealed and stored at room temperature. The reaction equation is given in Fig. 3 ▸. After six months of crystallization time, moisture- and temperature-sensitive, orange single crystals of the title compound were obtained in almost qu­anti­tative yield from the still orange solution. After manual separation of the crystals under a light-optical microscope and evaporation of the solvent only a minute orange residue remained.


Crystal structure of [Co(NH3)6][Co(CO)4]2.

Müller TG, Kraus F - Acta Crystallogr E Crystallogr Commun (2015)

Reaction equation for the preparation of the title compound.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4645071&req=5

fig3: Reaction equation for the preparation of the title compound.
Mentions: 86 mg (29.4 mmol) of Co2(CO)8 were placed in a flame-dried bomb tube under argon. 0.2 ml of liquid ammonia were condensed to the bomb tube. The bomb tube, now containing an orange solution, was flame-sealed and stored at room temperature. The reaction equation is given in Fig. 3 ▸. After six months of crystallization time, moisture- and temperature-sensitive, orange single crystals of the title compound were obtained in almost qu­anti­tative yield from the still orange solution. After manual separation of the crystals under a light-optical microscope and evaporation of the solvent only a minute orange residue remained.

Bottom Line: The resulting polyhedron, the hexa-amminecobalt(II) cation, exhibits point group symmetry -3.The crystal structure is related to that of high-pressure BaC2 (space group R-3m), with the [Co(NH3)6](2+) cations replacing the Ba sites and the [Co(CO)4](-) anions replacing the C sites.N-H⋯O hydrogen bonds between cations and anions stabilize the structural set-up in the title compound.

View Article: PubMed Central - HTML - PubMed

Affiliation: Anorganische Chemie, Fluorchemie, Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, 35032 Marburg, Germany.

ABSTRACT
Hexaamminecobalt(II) bis-[tetra-carbonyl-cobaltate(-I)], [Co(NH3)6][Co(CO)4]2, was synthesized by reaction of liquid ammonia with Co2(CO)8. The Co(II) atom is coordinated by six ammine ligands. The resulting polyhedron, the hexa-amminecobalt(II) cation, exhibits point group symmetry -3. The Co(-I) atom is coordinated by four carbonyl ligands, leading to a tetra-carbonyl-cobaltate(-I) anion in the shape of a slightly distorted tetra-hedron, with point group symmetry 3. The crystal structure is related to that of high-pressure BaC2 (space group R-3m), with the [Co(NH3)6](2+) cations replacing the Ba sites and the [Co(CO)4](-) anions replacing the C sites. N-H⋯O hydrogen bonds between cations and anions stabilize the structural set-up in the title compound.

No MeSH data available.