Osmium pentacarbonyl

Osmium pentacarbonyl
Identifiers
CAS Number
  • 16406-49-8
3D model (JSmol)
  • Interactive image
ChemSpider
  • 65793451
PubChem CID
  • 10892861
CompTox Dashboard (EPA)
  • DTXSID901336738 Edit this at Wikidata
InChI
  • InChI=1S/5CO.Os/c5*1-2;
    Key: RLUHVGZGDXPTEM-UHFFFAOYSA-N
  • C(=O)=[Os](=C=O)(=C=O)(=C=O)=C=O
Properties
Chemical formula
 C5O5Os
Molar mass 330.28 g·mol−1
Appearance colorless liquid
Melting point 2–2.5 °C (35.6–36.5 °F; 275.1–275.6 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound

Osmium pentacarbonyl is the organoosmium compound with the formula Os(CO)5. It is the simplest isolatable carbonyl complex of osmium. Osmium pentacarbonyl is a colorless volatile liquid that is obtained by treating solid triosmium dodecacarbonyl under 200 atmospheres of carbon monoxide at 280-290 °C. In contrast, also at 200 atm of CO, solid Ru3(CO)12 converts to Ru(CO)5 at milder temperature of 160 °C.[1]

Reactions

Structure proposed for Os2(CO)9.[2]

Samples of Os(CO)5 convert back to the trioosmium cluster upon heating to 80 °C. The analogous conversion of Ru(CO)5 back to Ru3(CO)12 occurs at room temperature.[1] Chlorination of the pentacarbonyl gives a cationic pentacarbonyl complex:[1]

Os(CO)5 + Cl2 → [Os(CO)5Cl]+Cl−

Upon UV irradiation, hexane solutions of the pentacarbonyl react with ethylene to give mono-, di-, and trisubstituted derivatives:[3]

Os(CO)5 + n C2H4 → Os(CO)5-n(C2H4)n + n CO (n = 1,2,3)

References

  1. ^ a b c Rushman, Paul; Van Buuren, Gilbert N.; Shiralian, Mahmoud; Pomeroy, Roland K. (1983). "Properties of the Pentacarbonyls of Ruthenium and Osmium". Organometallics. 2 (5): 693–694. doi:10.1021/om00077a026.
  2. ^ Moss, John R.; Graham, William A. G. (1977). "The Enneacarbonyls of Ruthenium and Osmium". Journal of the Chemical Society, Dalton Transactions: 95. doi:10.1039/DT9770000095.
  3. ^ Kiel, Gong Yu; Takats, Josef; Grevels, Friedrich Wielhelm (1987). "Multisubstitution of Os(CO)5 by ethylene: Isomeric Os(CO)2(C2H4)3 and a Derivative of Os(CO)(C2H4)4". Journal of the American Chemical Society. 109 (7): 2227–2229. doi:10.1021/ja00241a075.
  • v
  • t
  • e
Osmium compounds
Os(0)
  • Os(CO)5
  • Os3(CO)12
Os(0,I)
  • H2Os3(CO)10
Os(I)
  • OsB
  • OsI
Os(I,II)
  • Os2B3
Os(II)
  • OsB2
  • OsBr2
  • OsCl2
  • OsP2
  • OsI2
Organoosmium(II) compounds
  • Os(C5H5)2
    • Os(III)
    • OsI3
    • OsCl3
    • OsBr3
    Os(IV)
    • OsO2
    • OsBr4
    • OsCl4
    • OsF
      4
    • OsI4 (hypothetical)
    Os(V)
    • OsF5
    • OsCl5
    Os(VI)
    • OsF6
    Os(VII)
    • OsF
      7       (hypothetical)
    Os(VIII)
    • OsO4
    • OsS4
    • OsF8 (hypothetical)
    • v
    • t
    • e
    Metal carbonyl complexes
    H2CO He
    Li Be2(CO)4 H3BCO C(CO)2
    (C=C)(CO)2
    (HC=CH)CO     		NCO− OCO F2CO
    H(CO)F
    (FCO)2     		Ne
    Na Mg(O3)2(CO)2 Al Si PCO− SCO Cl2CO
    (ClCO)2     		Ar
    K Ca(CO)8 Sc(CO)8− Ti(CO)7
    Ti(CO)62-
    Cp2Ti(CO)2     		V(CO)6
    C5H5V(CO)4
    V(CO)6−     		Cr(CO)6
    C6H6Cr(CO)3     		Mn2(CO)10
    Mn(CO)5−     		Fe(CO)5
    Fe2(CO)9
    Fe3(CO)12
    Fe(CO)42−
    C4H6Fe(CO)3
    C4H4Fe(CO)3     		Co2(CO)8
    Co4(CO)12
    Co(CO)4−
    HC(Co(CO)3)3     		Ni(CO)4 (Cu(CO)Cl)n Zn Ga Ge As SeCO Br2CO Kr
    Rb Sr(CO)8 Y(CO)8− Zr Nb Mo(CO)6
    C7H8Mo(CO)3     		Tc2(CO)10
    Tc(CO)5−     		Ru(CO)5
    Ru3(CO)12
    Ru(CO)42−     		Rh4(CO)12
    Rh6(CO)16
    Rh2Cl2(CO)2     		Pd(CO)4 [Ag(CO)][B(OTeF5)4] Cd In Sn Sb Te I Xe
    Cs Ba(CO)8 * Lu Hf Ta W(CO)6
    (C5H5)2W2(CO)6     		Re2(CO)10
    Re(CO)5−     		Os(CO)5
    Os3(CO)12
    Os(CO)42−
    Os3(CO)102-     		Ir4(CO)12 Pt Au Hg Tl Pb Bi Po At Rn
    Fr Ra ** Lr Rf Db Sg(CO)6 Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
     
    * La(CO)8− Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb
    ** Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No