Carbonatobis(ethylenediamine)cobalt(III) chloride

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Carbonatobis(ethylenediamine)­cobalt(III) chloride
Identifiers
3D model (JSmol)
  • InChI=1S/2C2H8N2.CH2O3.ClH.Co/c2*3-1-2-4;2-1(3)4;;/h2*1-4H2;(H2,2,3,4);1H;/q;;;;+3/p-3
    Key: JVHWBGXYXBWMPO-UHFFFAOYSA-K
  • C(CN)N.C(CN)N.C(=O)([O-])[O-].[Cl-].[Co+3]
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).

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]

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]

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