UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper I

Q1(b). Coordination nomenclature

Question

Write IUPAC nomenclature of the following coordination compounds: (i) [CoCl(CN)(NO₂)(NH₃)₃] (ii) [Pt(Py)₄][PtCl₄].

(i) Triamminechloridocyanido(nitrito-κ N)cobalt(III). (ii) Tetrakis(pyridine)platinum(II) tetrachloridoplatinate(II).

In (i), chlorido, cyanido and nitrito each carry -1 charge; ammonia is neutral. The neutral complex therefore contains Co(III).
List ligand names alphabetically, ignoring multiplicative prefixes. The formula NO₂ is conventionally read as N-bound nitrite (traditional name nitro); ONO would specify O-bound nitrite.
In (ii), four neutral pyridine ligands surround Pt(II) in the cation.

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