- 2073 Bhadra · 4 marks
IUPAC names and EAN of complexes
Short answer
IUPAC names: hexaamminecobalt(III) chloride, tetraaquadichlorochromium(III) chloride, tetraamminecopper(II) sulfate, potassium hexafluoroaluminate(III). EAN values: Co 36, Cr 33, Cu 35, Al 22. Only cobalt attains the krypton configuration.
Write the IUPAC name of the following complexes compounds and find the Effective Atomic Number of the central metal in these complexes. (i) [Co(NH₃)₆]Cl₃ (ii) [Cr(H₂O)₄Cl₂]Cl (iii) [Cu(NH₃)₄]SO₄ (iv) K₃[AlF₆]
EAN = (Z − oxidation state) + 2 × (number of ligand donor pairs).
| Complex | IUPAC name | Metal | Calculation | EAN |
|---|---|---|---|---|
| [Co(NH₃)₆]Cl₃ | hexaamminecobalt(III) chloride | Co³⁺ | 27 − 3 + 12 | 36 |
| [Cr(H₂O)₄Cl₂]Cl | tetraaquadichlorochromium(III) chloride | Cr³⁺ | 24 − 3 + 12 | 33 |
| [Cu(NH₃)₄]SO₄ | tetraamminecopper(II) sulfate | Cu²⁺ | 29 − 2 + 8 | 35 |
| K₃[AlF₆] | potassium hexafluoroaluminate(III) | Al³⁺ | 13 − 3 + 12 | 22 |
Answer: EAN of Co = 36, Cr = 33, Cu = 35, Al = 22. Only the cobalt complex reaches the Kr configuration (36).
✓ Answer checked by Claude Opus 5.5 (high effort)
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