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Tetracobalt dodecacarbonyl

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Title: Tetracobalt dodecacarbonyl  
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Language: English
Subject: Nickel
Collection: Carbonyl Complexes, Cobalt Compounds
Publisher: World Heritage Encyclopedia

Tetracobalt dodecacarbonyl

Tetracobalt dodecacarbonyl
Other names
cobalt dodecacarbonyl, cobalt carbonyl
Molar mass 571.858 g/mol
Appearance black crystal
Density 2.09 g/cm3
Melting point decomposes at 60 °C (140 °F; 333 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tetracobalt dodecacarbonyl is the chemical compound with the formula Co4(CO)12. It is a black crystalline compound that is insoluble in water and easily oxidized by air. It is an example of a metal carbonyl cluster.

Synthesis and structure

This compound is synthesized by decarbonylation of Co2(CO)8.

2 Co2(CO)8 → Co4(CO)12 + 4 CO

The molecule consists of a tetrahedral Co4 core, but the molecular symmetry is C3v. Three carbonyl ligands are bridging ligands and nine are terminal.[1] The average Co-Co distance is 2.499 Å, the average C-O bond length is 1.133 Å, and the average Co-C-O angle is 177.5°.[2][3]

Rh4(CO)12 adopts the same C3v structure but Ir4(CO)12 has perfect Td symmetry with no bridging CO ligands groups.[4] The Rh4 and Ir4 clusters are more thermally robust than that of the Co4 compound, reflecting the usual trend in the strengths of metal-metal bond for second and third row metals vs those for the first row metals.


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