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Dicarbonyl(acetylacetonato)rhodium(I) is an 
organorhodium compound Organorhodium chemistry is the chemistry of organometallic compounds containing a rhodium-carbon chemical bond, and the study of rhodium and rhodium compounds as catalysts in organic reactions.
Stable organorhodium compounds and transient organor ...
with the formula Rh(O2C5H7)(CO)2. The compound consists of two CO ligand
In coordination chemistry, a ligand is an ion or molecule (functional group) that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's electr ...
s and an acetylacetonate
Acetylacetone is an organic compound with the chemical formula . It is a colorless liquid, classified as a 1,3-diketone. It exists in equilibrium with a tautomer . These tautomers interconvert so rapidly under most conditions that they are tre ...
. It is a dark green solid that dissolves in acetone
Acetone (2-propanone or dimethyl ketone), is an organic compound with the formula . It is the simplest and smallest ketone (). It is a colorless, highly volatile and flammable liquid with a characteristic pungent odour.
Acetone is miscib ...
and benzene
Benzene is an organic chemical compound with the molecular formula C6H6. The benzene molecule is composed of six carbon atoms joined in a planar ring with one hydrogen atom attached to each. Because it contains only carbon and hydrogen atoms, ...
, giving yellow solutions. The compound is used as a precursor to homogeneous catalysts.
It is prepared by treating rhodium carbonyl chloride
Rhodium carbonyl chloride is an organorhodium compound with the formula Rh2Cl2(CO)4. It is a red-brown volatile solid that is soluble in nonpolar organic solvents. It is a precursor to other rhodium carbonyl complexes, some of which are useful in ...
with sodium acetylacetonate
Sodium acetylacetonate is an organic compound with the nominal formula Na H(C(O)CH3)2 This white, water-soluble solid is the conjugate base of acetylacetone.
Preparation
The compound is prepared by deprotonation of acetylacetone:
:NaOH + CH ...
in the presence of base:
: CO)2RhClsub>2 + 2 NaO2C5H7 → 2 Rh(O2C5H7)(CO)2 + 2 NaCl
The complex adopts square planar molecular geometry
The square planar molecular geometry in chemistry describes the stereochemistry (spatial arrangement of atoms) that is adopted by certain chemical compounds. As the name suggests, molecules of this geometry have their atoms positioned at the corne ...
. The molecules stack with Rh---Rh distances of about 326 pm. As such, it is representative of a linear chain compound.
References
{{Acetylacetonate complexes Organorhodium compounds Homogeneous catalysis Carbonyl complexes Acetylacetonate complexes Rhodium(I) compounds