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Dimanganese decacarbonyl, [3] which has the chemical formula Mn 2 (CO) 10, is a binary bimetallic carbonyl complex centered around the first row transition metal manganese.The first reported synthesis of Mn 2 (CO) 10 was in 1954 at Linde Air Products Company and was performed by Brimm, Lynch, and Sesny. [4]
When conducted under an atmosphere of carbon monoxide, reduction of Mn(II) salts gives dimanganese decacarbonyl Mn 2 (CO) 10, an orange and volatile solid. The air-stability of this Mn(0) compound (and its many derivatives) reflects the powerful electron-acceptor properties of carbon monoxide.
Mn 2 (CO) 10 + Br 2 → 2 BrMn(CO) 5. The complex undergoes substitution by a variety of donor ligands (L), e.g. to give derivatives of the type BrMn(CO) 3 L 2. The complex adopts an octahedral coordination geometry. [2] Manganese pentacarbonyl bromide is a precursor to the arene complexes [(η 6-arene)Mn(CO) 3] +. [3]
Mn 2 (CO) 10 is a simple and clear case of a metal-metal bond because no other atoms tie the two Mn atoms together. When several metals are linked by metal-metal bonds, the compound or ion is called a metal cluster. Many metal clusters contain several unsupported M–M bonds. Some examples are M 3 (CO) 12 (M = Ru, Os) and Ir 4 (CO) 12.
Group 7 elements with 7 valence electrons form pentacarbonyl dimers Mn 2 (CO) 10, Tc 2 (CO) 10, and Re 2 (CO) 10. Group 8 elements with 8 valence electrons form pentacarbonyls Fe(CO) 5, Ru(CO) 5 and Os(CO) 5. The heavier two members are unstable, tending to decarbonylate to give Ru 3 (CO) 12, and Os 3 (CO) 12.
MnCO 3 + 0.44 O 2 → MnO 1.8 + CO 2. This method is sometimes employed in the production of manganese dioxide, which is used in dry-cell batteries and for ferrites. [3] Manganese carbonate is widely used as an additive within plant fertilizers. It is also used in multivitamins, in ceramics as a glaze colorant and flux, and in concrete stains. [5]
MnCO 3 → MnO + CO 2. This calcining process is conducted anaerobically, lest Mn 2 O 3 form. An alternative route, mostly for demonstration purposes, is the oxalate method, which also applicable to the synthesis of ferrous oxide and stannous oxide. Upon heating in an oxygen-free atmosphere (usually CO 2), manganese(II) oxalate decomposes into ...
The development of metal carbonyl clusters such as Ni(CO) 4 and Fe(CO) 5 led quickly to the isolation of Fe 2 (CO) 9 and Fe 3 (CO) 12.Rundle and Dahl discovered that Mn 2 (CO) 10 featured an "unsupported" Mn-Mn bond, thereby verifying the ability of metals to bond to one another in molecules.