Hexadecacarbonylhexarhodium

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Hexadecacarbonylhexarhodium
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Names
IUPAC name
Hexadecacarbonylhexarhodium
Other names
Hexarhodium hexadecacarbonyl
Identifiers
28407-51-4 YesY
Properties
C16O16Rh6
Molar mass 1065.62 g/mol
Appearance Black crystals
Melting point 235 °C (455 °F; 508 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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 iron pentacarbonyl 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
3 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

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