![]() | |
![]() | |
![]() | |
Names | |
---|---|
IUPAC name
Di-μ-chloro-bis[chloro(pentamethylcyclopentadienyl)rhodium(III)]
| |
Other names
Dichloro(pentamethylcyclopentadienyl)rhodium(III)
| |
Identifiers | |
3D model (
JSmol)
|
|
ChemSpider | |
PubChem
CID
|
|
| |
| |
Properties | |
C20H30Cl4Rh2 | |
Molar mass | 618.07 g·mol−1 |
Appearance | red solid |
dichloromethane, chloroform | |
Hazards | |
GHS labelling: | |
![]() ![]() | |
Danger | |
H302, H312, H315, H319, H332, H334, H335 | |
P261, P264, P270, P271, P280, P285, P301+P312, P302+P352, P304+P312, P304+P340, P304+P341, P305+P351+P338, P312, P321, P322, P330, P332+P313, P337+P313, P342+P311, P362, P363, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Pentamethylcyclopentadienyl rhodium dichloride dimer is an organometallic compound with the formula [(C5(CH3)5RhCl2)]2, commonly abbreviated [Cp*RhCl22 This dark red air-stable diamagnetic solid is a reagent in organometallic chemistry. [1]
The compound has idealized C2h symmetry. Each metal centre is pseudo-octahedral.
The compound is prepared by the reaction of rhodium trichloride trihydrate and
pentamethylcyclopentadiene in hot methanol, from which the product precipitates:
[1]
It was first prepared by the reaction of hydrated rhodium trichloride with hexamethyl Dewar benzene [2]
This complex was first prepared from hexamethyl Dewar benzene and RhCl3(H2O)3. [3] [4] [5] The hydrohalic acid necessary for the ring-contraction rearrangement is generated in situ in methanolic solutions of the rhodium salt, and the second step has been carried out separately, confirming this mechanistic description. [6] The reaction occurs with the formation of 1,1-dimethoxyethane, CH3CH(OCH3)2, and hexamethylbenzene is produced by a side reaction. [5] [6]
This rhodium(III) dimer can be reduced with zinc in the presence of CO to produce the rhodium(I) complex [Cp*Rh(CO)2]. [7]
Reductive carbonylation gives [Cp*Rh(CO)2]. [8]
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, leaving a solution containing dications of the form [Cp*RhL32+ (L = H2O, MeCN).
The chemistry is similar to that of the analog pentamethylcyclopentadienyl iridium dichloride dimer.
{{
cite book}}
: |journal=
ignored (
help)
![]() | |
![]() | |
![]() | |
Names | |
---|---|
IUPAC name
Di-μ-chloro-bis[chloro(pentamethylcyclopentadienyl)rhodium(III)]
| |
Other names
Dichloro(pentamethylcyclopentadienyl)rhodium(III)
| |
Identifiers | |
3D model (
JSmol)
|
|
ChemSpider | |
PubChem
CID
|
|
| |
| |
Properties | |
C20H30Cl4Rh2 | |
Molar mass | 618.07 g·mol−1 |
Appearance | red solid |
dichloromethane, chloroform | |
Hazards | |
GHS labelling: | |
![]() ![]() | |
Danger | |
H302, H312, H315, H319, H332, H334, H335 | |
P261, P264, P270, P271, P280, P285, P301+P312, P302+P352, P304+P312, P304+P340, P304+P341, P305+P351+P338, P312, P321, P322, P330, P332+P313, P337+P313, P342+P311, P362, P363, P403+P233, P405, P501 | |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Pentamethylcyclopentadienyl rhodium dichloride dimer is an organometallic compound with the formula [(C5(CH3)5RhCl2)]2, commonly abbreviated [Cp*RhCl22 This dark red air-stable diamagnetic solid is a reagent in organometallic chemistry. [1]
The compound has idealized C2h symmetry. Each metal centre is pseudo-octahedral.
The compound is prepared by the reaction of rhodium trichloride trihydrate and
pentamethylcyclopentadiene in hot methanol, from which the product precipitates:
[1]
It was first prepared by the reaction of hydrated rhodium trichloride with hexamethyl Dewar benzene [2]
This complex was first prepared from hexamethyl Dewar benzene and RhCl3(H2O)3. [3] [4] [5] The hydrohalic acid necessary for the ring-contraction rearrangement is generated in situ in methanolic solutions of the rhodium salt, and the second step has been carried out separately, confirming this mechanistic description. [6] The reaction occurs with the formation of 1,1-dimethoxyethane, CH3CH(OCH3)2, and hexamethylbenzene is produced by a side reaction. [5] [6]
This rhodium(III) dimer can be reduced with zinc in the presence of CO to produce the rhodium(I) complex [Cp*Rh(CO)2]. [7]
Reductive carbonylation gives [Cp*Rh(CO)2]. [8]
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, leaving a solution containing dications of the form [Cp*RhL32+ (L = H2O, MeCN).
The chemistry is similar to that of the analog pentamethylcyclopentadienyl iridium dichloride dimer.
{{
cite book}}
: |journal=
ignored (
help)