Dicarbonyl(acetylacetonato)rhodium(I)

Dicarbonyl(acetylacetonato)rhodium(I) is an organorhodium compound with the formula Rh(O2C5H7)(CO)2. The compound consists of two CO ligands and an acetylacetonate. It is a dark green solid that dissolves in acetone and benzene, giving yellow solutions. The compound is used as a precursor to homogeneous catalysts.[2]

Dicarbonyl(acetylacetonato)­rhodium(I)
Names
Other names
Rhodium acetylacetonate dicarbonyl
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.035.392
  • InChI=1S/C5H8O2.2CO.Rh/c1-4(6)3-5(2)7;2*1-2;/h3,6H,1-2H3;;;/b4-3+;;;
    Key: GGRQQHADVSXBQN-FHJHGPAASA-N
  • CC(=CC(=O)C)O.[C-]#[O+].[C-]#[O+].[Rh]
Properties
C7H7O4Rh
Molar mass 258.034 g·mol−1
Appearance green solid
Density 1.95 g/cm3
Melting point 155 °C (311 °F; 428 K)
Structure[1]
triclinic
P1
a = 6.5189 Å, b = 7.7614 Å, c = 9.205 Å
α = 106.04°, β = 91.15°, γ = 100.21°
at 20°C
439.3 Å3
2
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

It is prepared by treating rhodium carbonyl chloride with sodium acetylacetonate in the presence of base:[3]

[(CO)2RhCl]2 + 2 NaO2C5H7 → 2 Rh(O2C5H7)(CO)2 + 2 NaCl

The complex adopts square planar molecular geometry. The molecules stack with Rh---Rh distances of about 326 pm. As such, it is representative of a linear chain compound.[1]

Portion of the lattice of Rh(acac)(CO)2 showing the "stacking" of the individual planar units through Rh---Rh interactions.

References
  1. Huq, Fazlul; Skapski, Andrzej C. (1974). "Refinement of the Crystal Structure of Acetylacetonatodicarbonylrhodium(I)". Journal of Crystal and Molecular Structure. 4 (6): 411–418. doi:10.1007/BF01220097. S2CID 96977904.
  2. Zacuto, Michael J.; Leighton, James L. (2002). "Dicarbonyl(acetylacetonato) Rhodium(I)". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn00024. ISBN 0471936235.
  3. Bonati, F.; Wilkinson, G. (1964). "Dicarbonyl-β-diketonato- and Related Complexes of Rhodium(I)". J. Chem. Soc.: 3156–3160. doi:10.1039/JR9640003156.
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