Carbonatobis(ethylenediamine)cobalt(III) chloride is a salt with the formula [CoCO3(en)2]Cl (en = ethylenediamine). It is a red diamagnetic solid that is soluble in water. It is the monochloride salt of a cationic carbonate complex [CoCO3(en)2]+. The chloride ion in this salt readily undergoes ion exchange. The compound is synthesized by the oxidation of a mixture of cobalt(II) chloride, lithium hydroxide, and ethylenediamine in the presence of carbon dioxide:[1]
2CO3)CL.svg) | |
| Identifiers | |
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3D model (JSmol) | |
PubChem CID | |
CompTox Dashboard (EPA) | |
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| Properties | |
| C5H16ClCoN4O3 | |
| Molar mass | 274.59 g·mol−1 |
| Appearance | red solid |
| Density | 1.79 g/cm3 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
- CoCl2 + 2 en + CO2 + 0.5 H2O2 + LiOH → [CoCO3(en)2]Cl + H2O + LiCl
The cationic complex is octahedral with C2 symmetry.[2]
The carbonato ligand is readily replaced upon acid hydrolysis. Derivatives include the following complexes: cis- and trans-[CoCl2(en)2]+, cis-[Co(OH)(H2O)3(en)2]2+, cis-[Co(OH2)2(en)2]+, and cis-[Co(NO2)2(en)2]+.[1] Reaction with trifluoromethanesulfonic acid (HOTf) gives [Co(OTf)2(en)2]OTf.[3]