Pentamethylcyclopentadienyl rhodium dichloride dimer is an

organometallic Organometallic chemistry is the study of organometallic compounds, chemical compounds containing at least one chemical bond between a carbon atom of an organic molecule and a metal, including alkali, alkaline earth, and transition metals, and so ...

compound with the formula C₅(CH₃)₅RhCl₂)sub>2, commonly abbreviated p*RhCl₂sub>2 This dark red air-stable

diamagnetic Diamagnetic materials are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. In contrast, paramagnetic and ferromagnetic materials are attracted ...

solid is a reagent in organometallic chemistry.

Structure and preparation

The compound has idealized C_2h

symmetry Symmetry (from grc, συμμετρία "agreement in dimensions, due proportion, arrangement") in everyday language refers to a sense of harmonious and beautiful proportion and balance. In mathematics, "symmetry" has a more precise definit ...

. Each metal centre is pseudo-octahedral. The compound is prepared by the reaction of rhodium trichloride trihydrate and

pentamethylcyclopentadiene 1,2,3,4,5-Pentamethylcyclopentadiene is a cyclic diene with the formula C5Me5H (Me = CH3). 1,2,3,4,5-Pentamethylcyclopentadiene is the precursor to the ligand ''1,2,3,4,5-pentamethylcyclopentadienyl'', which is often denoted Cp* (C5Me5) and read ...

in hot methanol, from which the product precipitates: :2 Cp*H + 2 RhCl₃(H₂O)₃ -> ce \text/chem> p*RhCl₂sub>2 + 2 HCl + 6 H₂O It was first prepared by the reaction of hydrated

rhodium trichloride Rhodium(III) chloride refers to inorganic compounds with the formula RhCl3(H2O)''n'', where ''n'' varies from 0 to 3. These are diamagnetic solids featuring octahedral Rh(III) centres. Depending on the value of ''n'', the material is either a de ...

with

hexamethyl Dewar benzene Dewar benzene (also spelled ''dewarbenzene'') or bicyclo .2.0exa-2,5-diene is a bicyclic isomer of benzene with the molecular formula C6H6. The compound is named after James Dewar who included this structure in a list of possible C6H6 structures ...

Reactions

Reductive

carbonylation Carbonylation refers to reactions that introduce carbon monoxide into organic and inorganic substrates. Carbon monoxide is abundantly available and conveniently reactive, so it is widely used as a reactant in industrial chemistry. The term carbon ...

gives p*Rh(CO)₂ The Rh-'' μ''-Cl bonds are labile and cleave en route to a variety of adducts of the general formula Cp*RhCl₂L. Treatment with silver ions in polar coordinating solvents causes precipitation of

silver(I) chloride Silver chloride is a chemical compound with the chemical formula Ag Cl. This white crystalline solid is well known for its low solubility in water (this behavior being reminiscent of the chlorides of Tl+ and Pb2+). Upon illumination or heating, ...

, leaving a solution containing dications of the form p*RhL₃sup>2+ (L = H₂O, MeCN). The chemistry is similar to that of the

analog Analog or analogue may refer to: Computing and electronics * Analog signal, in which information is encoded in a continuous variable ** Analog device, an apparatus that operates on analog signals *** Analog electronics, circuits which use analog ...

pentamethylcyclopentadienyl iridium dichloride dimer Pentamethylcyclopentadienyl iridium dichloride dimer is an organometallic compound with the formula C5(CH3)5IrCl2)sub>2, commonly abbreviated p*IrCl2sub>2 This bright orange air-stable diamagnetic solid is a reagent in organometallic chemistry ...

References

Organorhodium compounds Dimers (chemistry) Pentamethylcyclopentadienyl complexes Chloro complexes Rhodium(III) compounds {{Rhodium compounds

Structure and preparation

Reactions

Further reading (early literature)

References