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IUPAC Nomenclature of Coordination Compounds

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: IUPAC Nomenclature of Coordination Compounds

1. Order

  • Ligand → Metal
  • Cation first, then anion

2. Ligand Names

  • Cl⁻ → chloro
  • CN⁻ → cyano
  • OH⁻ → hydroxo
  • NH₃ → ammine
  • H₂O → aqua
  • CO → carbonyl

3. Number Prefix

  • di, tri, tetra, penta, hexa
  • Special: bis, tris (if ligand has number)

4. Order of Ligands

  • Alphabetical order

5. Metal Name

  • Neutral/cation → normal name
  • Anionic complex → ends with “-ate”
    Fe → ferrate
    Cu → cuprate
    Co → cobaltate

6. Oxidation State

  • Write in Roman (II), (III)

7. Important

  • Counter ions not named
  • Complex always in [ ]

8. Examples

Neutral complexes

  • [Co(NO₂)₃(NH₃)₃] → Triamminetrinitrocobalt(III)
  • Fe(CO)₅ → Pentacarbonyliron(0)

Cationic complexes

  • [Cu(NH₃)₄]²⁺ → Tetraamminecopper(II) ion
  • [Fe(H₂O)₅(NCS)]²⁺ → Pentaaquathiocyanatoiron(III) ion

Anionic complexes

  • [Ni(CN)₄]²⁻ → Tetracyanonickelate(II) ion
  • [Fe(CN)₆]⁴⁻ → Hexacyanoferrate(II) ion

Compounds (Very Important)

  • [Co(NH₃)₅Cl]Cl₂ → Pentaamminechlorocobalt(III) chloride
  • K₃[Al(C₂O₄)₃] → Potassium trioxalatoaluminate(III)
  • Na₃[Co(NO₂)₆] → Sodium hexanitrocobaltate(III)
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