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

IUPAC name of _{6}\right] \) is

IUPAC name of \( N a_{3}\left[C o\left(N O_{2}\right)_{6}\right] \) is

  • A. sodium hexanitrocobaltate (III)
  • B. sodium cobaltnitrate
  • C. trisodium hexanitrocobalt
  • D. hexanitrocobalt (III) trisodium complex

Step-by-step solution

In Na3[Co(NO2)6], the cation is Na+ and the anion is [Co(NO2)6]^3-. The ligand NO2- is nitro, and six are indicated by 'hexanitro'. The cobalt is in the +3 oxidation state (since each NO2- is -1, total -6, and overall charge -3 gives Co +3). Anionic complexes of cobalt are named cobaltate, so the anion is hexanitrocobaltate(III). The name of the compound is sodium hexanitrocobaltate(III).
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