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Osmium pentacarbonyl

Osmium pentacarbonyl
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/5CO.Os/c5*1-2;
    Key: RLUHVGZGDXPTEM-UHFFFAOYSA-N
  • C(=O)=[Os](=C=O)(=C=O)(=C=O)=C=O
Properties
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).

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

[edit]
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

[edit]
  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.
Os(0)
Os(0,I)
Os(I)
Os(I,II)
Os(II)
Organoosmium(II) compounds
Os(III)
Os(IV)
Os(V)
Os(VI)
Os(VII)
Os(VIII)
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
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Osmium pentacarbonyl
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