Chemistry · IUPAC nomenclature of mononuclear co-ordination compounds, isomerism

The correct name for the complex ion (e n)_{2}\right]^{+} \) is :

The correct name for the complex ion \( \left[\operatorname{CoCl}(O N)(e n)_{2}\right]^{+} \) is :

  • A. chlorobis(ethylenediamine)nitrito-O-cobaltate (III) ion
  • B. chlorodiethyldiaminenitrito-O-cobalt (III) ion
  • C. chloronitrito-O-diethyldiamine cobaltate (III) ion
  • D. chlorobis(ethylenediamine)nitrito-O-cobalt (III) ion

Step-by-step solution

The complex ion [CoCl(ON)(en)₂]⁺ contains cobalt in +3 oxidation state. Ligands: chloro (Cl⁻), nitrito-O (ON⁻), and two ethylenediamine (en, neutral). Ligands are named alphabetically: chloro, then nitrito-O, then bis(ethylenediamine). Since the complex is cationic, the metal is named as 'cobalt' followed by the oxidation state in parentheses. Thus, the correct name is chlorobis(ethylenediamine)nitrito-O-cobalt(III) ion.
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