Diiron nonacarbonyl
- Hexacarbonyldieisen tris ( μ -carbonyl)
- [(CO) 3Fe ( μ - CO) 3Fe (CO ) 3]
- Diiron
- Dieisenenneacarbonyl
- Eisenenneacarbonyl
Yellow- orange crystals
Fixed
2.85 g · cm -3
100 ° C ( decomposition)
Insoluble in water
Risk
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Diiron ( designation according to IUPAC: tris ( μ -carbonyl) hexacarbonyldieisen ) is one of the three carbonyls of iron. The yellow-gold organometallic complex compound melts at 100 ° C with decomposition in their raw materials. In the organometallic compound as reactive to transfer a Fe ( CO) 3 group is used to a BH ( or B ) or a C- fragment is isolobal (structure of cluster compounds ).
Occurrence
Diiron arises eg in the case of iron production in the blast furnace:
Representation
Fe2 ( CO) 9 is represented by the irradiation of the liquid with iron pentacarbonyl UV-/Sonnenlicht.
Properties
Diiron is in the form of glossy, golden yellow, fairly stable in dry air leaflets, without decomposition at -35 ° C in an inert gas atmosphere are durable. It is insoluble in aliphatic hydrocarbons, benzene and diethyl ether, and slightly soluble in methanol. There is a slow decomposition on exposure to tetrahydrofuran and chlorinated hydrocarbons. In the presence of organic solvents decomposition takes place above approximately 60 ° C to form iron pentacarbonyl and triiron dodecacarbonyl without release of carbon monoxide. In the solid state is carried out between 100 and 120 ° C, decomposition by:
Diiron nonacarbonyl consists of two iron atoms at a distance of 246 pm, are attached to the three terminal carbonyl. Three other carbonyl groups bridging between the iron atoms. Whether there is a direct metal -metal bond between the iron atoms, is difficult to answer and controversial, as there is no possible criterion for metal-metal bonds such as bond lengths, magnetism, and the 18- electron rule to allow a final statement. Theoretical calculations indicate, however, that no direct iron-iron bond exists and the bond in the molecule comes solely from interactions on the CO bridge about.