Dimanganese decacarbonyl

Dimanganese decacarbonyl

Names
IUPAC name bis(pentacarbonylmanganese)(Mn—Mn)
Other names Manganese carbonyl Decacarbonyldimanganese
Identifiers
CAS Number	10170-69-1 Y
3D model (Jmol)	Interactive image
ChemSpider	451751 Y
ECHA InfoCard	100.030.392
PubChem	517769
RTECS number	GG0300000
UNII	85SI7K7FWW N
InChI InChI=1S/10CO.2Mn/c10*1-2;; Y Key: QFEOTYVTTQCYAZ-UHFFFAOYSA-N Y InChI=1/10CO.2Mn/c10*1-2;; Key: QFEOTYVTTQCYAZ-UHFFFAOYAD
SMILES [Mn].[Mn].[C-]#[O+].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-].[O+]#[C-]
Properties
Chemical formula	C10O10Mn2
Molar mass	389.98 g/mol
Appearance	yellow crystals
Density	1.750 g/cm3
Melting point	154 °C (309 °F; 427 K)
Boiling point	sublimes 60 °C (140 °F; 333 K) at 0.5 mm Hg
Solubility in water	insoluble
Structure
Dipole moment	0 D
Hazards
Main hazards	CO source
R-phrases	23/24/25
S-phrases	22-26-36/37/39-45
Related compounds
Related compounds	Re2(CO)10 Co2(CO)8 Fe3(CO)12 Fe2(CO)9
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Dimanganese decacarbonyl is the chemical compound with the formula Mn₂(CO)₁₀. This metal carbonyl is an important reagent in the organometallic chemistry of manganese.

The compound was first prepared in low yield by the reduction of manganese iodide with magnesium under CO. A more efficient preparation entails reduction of anhydrous MnCl₂ with sodium benzophenone ketyl under 200 atmospheres of CO. The availability of inexpensive methylcyclopentadienyl manganese tricarbonyl ("MMT") has led to a low pressure route to Mn₂(CO)₁₀.

Mn₂(CO)₁₀ has no bridging CO ligands: it can be described (CO)₅Mn-Mn(CO)₅. There are two kinds of CO ligands; one CO on each Mn is coaxial with the Mn-Mn bond (293 pm), and four on each manganese that are perpendicular to it (equatorial). In the stable rotamer, the two Mn(CO)₅ subunits are staggered. The overall molecule thus belongs to the point group D_4d, which is an uncommon symmetry.

Mn₂(CO)₁₀ is air stable as a crystalline solid, but solutions require Schlenk techniques. It finds limited use in organic synthesis. Characteristic reactions:

The anion is a versatile nucleophile. Protonation gives the hydride [HMn(CO)₅], and methylation gives [(CH₃)Mn(CO)₅].

Mn₂(CO)₁₀ is a volatile source of a metal and a source of CO.