Hexadecacarbonylhexarhodium

Hexadecacarbonylhexarhodium
IUPAC name

Hexadecacarbonylhexarhodium
Other names

Hexarhodium hexadecacarbonyl
Identifiers
CAS number 28407-51-4
Properties
Molecular formula C16O16Rh6
Molar mass 1065.62 g/mol
Appearance Black crystals
Melting point

235 °C, 508 K, 455 °F
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Hexadecacarbonylhexarhodium is a metal carbonyl cluster with the formula Rh6(CO)16.[1] It exists as black crystals that are soluble in organic solvents.[2]

Discovery and synthesis

Rh6(CO)16 was first prepared by Heiber in 1943 by carbonylation of RhCl3•3H2O at 80-230 °C and 200 atm carbon monoxide with silver or copper as a halide acceptor. It was incorrectly formulated as Rh4(CO)11. Subsequently, the carbonylation of a mixture of anhydrous rhodium trichloride and pentacarbonyliron was shown to give good yields of Rh6(CO)16. Other compounds of rhodium are also effective precursors such as Rh2Cl2(CO)4 and rhodium(II) acetate:[3]

3 Rh2(O2CCH3)4 + 22 CO + 6 H2O → Rh6(CO)16 + 6 CO2 + 12 CH3CO2H
Rh2Cl2(CO)4 + 4 CO + 6 Cu → Rh6(CO)16 + 6 CuCl

Reactions and applications

Rh6(CO)16 catalyzes a number of organic reactions including hydrogenation and hydroformylation.[2]

References

  1. ^ Eugene R. Corey, Lawrence F. Dahl, Wolfgang Beck (1963). "Rh6(CO)16 and its Identity with Previously Reported Rh4(CO)11". J. Am. Chem. Soc. 85 (8): 1202–1203. doi:10.1021/ja00891a040. 
  2. ^ a b Shanklin, Michael S. Doyle, Michael P. Encyclopedia of Reagents for Organic Synthesis (2001) doi:10.1016/S0022-328X(00)87682-2
  3. ^ B.R. James, G. L. Rempel and W.K. Teo (1976). "Hexadecacarbonylhexarhodium". Inorganic Syntheses 16 (49). doi:10.1002/9780470132470.ch15..