Chemistry:Cis-Dichlorobis(ethylenediamine)cobalt(III) chloride
cobalt(III)_chloride.png)
| |
| Identifiers | |
|---|---|
3D model (JSmol)
|
|
| ChemSpider | |
PubChem CID
|
|
| |
| |
| Properties | |
| C4H16Cl3CoN4 | |
| Molar mass | 285.48 g·mol−1 |
| Appearance | violet solid |
| Melting point | decomposes |
| good | |
| Hazards | |
| GHS pictograms | 
|
| GHS Signal word | Warning |
| H315, H319, H335 | |
| PP261Script error: No such module "Preview warning".Category:GHS errors, PP264Script error: No such module "Preview warning".Category:GHS errors, PP271Script error: No such module "Preview warning".Category:GHS errors, PP280Script error: No such module "Preview warning".Category:GHS errors, PP302 + P352Script error: No such module "Preview warning".Category:GHS errors, PP304 + P340Script error: No such module "Preview warning".Category:GHS errors, PP305 + P351 + P338Script error: No such module "Preview warning".Category:GHS errors, PP312Script error: No such module "Preview warning".Category:GHS errors, PP321Script error: No such module "Preview warning".Category:GHS errors, PP332 + P313Script error: No such module "Preview warning".Category:GHS errors, PP337 + P313Script error: No such module "Preview warning".Category:GHS errors, PP362Script error: No such module "Preview warning".Category:GHS errors, PP403 + P233Script error: No such module "Preview warning".Category:GHS errors, PP405Script error: No such module "Preview warning".Category:GHS errors, PP501Script error: No such module "Preview warning".Category:GHS errors | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
| |
| Infobox references | |
cis-Dichlorobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCl2(en)2]Cl (en = ethylenediamine). The salt consists of a cationic coordination complex and a chloride anion. It is a violet diamagnetic solid that is soluble in water. One chloride ion in this salt readily undergoes ion exchange, but the two other chlorides are less reactive, being bound to the metal center.
Synthesis and optical resolution
Cis-dichlorobis(ethylenediamine)cobalt(III) chloride is obtained by heating a solution of trans-dichlorobis(ethylenediamine)cobalt(III) chloride, e.g. using a steam bath.
The racemate can be resolved into two enantiomers (Λ and Δ) by the formation of the d-α-bromocamphor-π-sulfonate salt. The diastereomeric salts are separated by recrystallization. After their purification, the individual diastereomers are converted back to the chloride salt by reaction with ice cold hydrochloric acid.[2]
Λ-cis-[CoCl2(en)2]+
Δ-cis-[CoCl2(en)2]+
cobalt(III).png)
cobalt(III).png)
cobalt(III)_chloride.png)
Related complexes
This salt is less soluble than its dull-green isomer trans-dichlorobis(ethylenediamine)cobalt(III) chloride. This pair of isomers were significant in the development of the area of coordination chemistry.[3] The chiral cis isomer is obtained by heating the trans isomer. Both isomers of dichlorobis(ethylenediamine)cobalt(III) have often been used in stereochemical studies.
Tris(ethylenediamine)cobalt(III) chloride in contrast to the bis(ethylenediamine) complexes does not undergo substitution.
References
- ↑ "575909". sigma. https://www.sigmaaldrich.com/AU/en/sds/aldrich/575909.
- ↑ John C. Bailar, Jr. (1946). "Cis - and trans -Dichlorobis-(ethylenediamine)cobalt(III) Chloride and the Resolution of the cis Form". Cis- and Trans-Dichlorobis-(Ethylenediamine)Cobalt(III) Chloride and the Resolution of the Cis Form. Inorganic Syntheses. 2. p. 222-225. doi:10.1002/9780470132333.ch71. ISBN 9780470132333.
- ↑ Jörgensen, S.M. "Ueber Metalldiaminverbindungen" J. prakt. Chem. (in German), 1889, volume 39, page 8. doi:10.1002/prac.18890390101
 |  |
