Dimanganese decacarbonyl

Dimanganese decacarbonyl
Dimanganese decacarbonyl
Identifiers
CAS number 10170-69-1 YesY
ChemSpider 451751 YesY
RTECS number GG0300000
Jmol-3D images Image 1
Properties
Molecular formula C10O10Mn2
Molar mass 389.98 g/mol
Appearance yellow crystals
Density 1.750 g/cm3
Melting point

154 °C

Boiling point

sublimes 60 °C
(0.5 mm Hg)

Solubility in water insoluble
Structure
Dipole moment 0 D
Hazards
R-phrases 23/24/25
S-phrases 22-26-36/37/39-45
Main hazards CO source
Related compounds
Related compounds Co2(CO)8
Fe3(CO)12
Fe2(CO)9
 YesY decacarbonyl (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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.[1]

Contents

Synthesis

The compound was first prepared in low yield by the reduction of manganese iodide with magnesium under CO.[2] A more efficient preparation entails reduction of anhydrous MnCl2 with sodium benzophenone ketyl under 200 atmospheres of CO.[3] The availability of inexpensive methylcyclopentadienyl manganese tricarbonyl ("MMT") has led to a low pressure route to Mn2(CO)10.[4]

Structure

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, 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 D4d, which is an uncommon symmetry.

Reactions

Mn2(CO)10 is air stable as a crystalline solid, but solutions require Schlenk techniques. It finds limited use in organic synthesis.[5] Characteristic reactions:

  • Reduction of Mn2(CO)10 gives the manganese pentacarbonyl anion, which can be isolated as a salt:
Mn2(CO)10 + 2 Na → 2 Na[Mn(CO)5]

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

  • Halogenation of Mn2(CO)10 proceeds with scission of the Mn-Mn bond.
Mn2(CO)10 + Br2 → 2[Mn(CO)5Br]

Safety

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

References

  1. ^ Elschenbroich, C. ”Organometallics” (2006) Wiley-VCH: Weinheim. ISBN 978-3-29390-6
  2. ^ Brimm, E. O.; Lynch, M. A.; Sesny, W. J. "Preparation and Properties of Manganese Carbonyl" Journal of the American Chemical Society 1954, volume 76, page 3831 - 3835.
  3. ^ King, R. B. Organometallic Syntheses. Volume 1 Transition-Metal Compounds; Academic Press: New York, 1965. ISBN 0-444-42607-8
  4. ^ King, R. B.; Stokes, J. C.; Korenowski, T. F. "A Convenient Synthesis of Dimanganese Decarbonyl from Inexpensive Starting Materials at Atmospheric Pressure" Journal of Organometallic Chemistry 1968, volume 11, Pages 641-643.
  5. ^ Pauson, P. L. “Decacarbonyldimanganese” in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. DOI: 10.1002/047084289.

Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Dirheniumdecacarbonyl — Strukturformel Allgemeines Name Dirheniumdecacarbonyl Summenforme …   Deutsch Wikipedia

  • Organomanganese chemistry — is the chemistry of organometallic compounds containing a carbon to manganese chemical bond. In a recent review Cahiez et al. argue that as manganese is cheap and benign (only iron performs better in these aspects), organomanganese compounds have …   Wikipedia

  • Nickel carbonyl — Chembox new Name = Nickel carbonyl ImageFile = Nickel carbonyl 2D.png ImageSize = 150px ImageName = Nickel carbonyl ImageFile1 = Nickel carbonyl 3D vdW.png ImageSize1 = 150px ImageName1 = Nickel carbonyl IUPACName = Tetracarbonylnickel(0)… …   Wikipedia

  • Diiron nonacarbonyl — Diiron nonacarbonyl …   Wikipedia

  • Molecular symmetry — in chemistry describes the symmetry present in molecules and the classification of molecules according to their symmetry. Molecular symmetry is a fundamental concept in chemistry, as it can predict or explain many of a molecule s chemical… …   Wikipedia

  • Chromium hexacarbonyl — IUPAC name Hexacarbonylchromium …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”