Question

Write IUPAC names of the following coordination compounds:
(i) \( [Ag(NH_3)_2][Ag(CN)_2] \)
(ii) \( K_3[Fe(C_2O_4)_3] \)

Hint:

When the metal is in an anionic complex, its name must end with the suffix '-ate' (e.g., Ferrate, Argentate, Cuprate, Plumbate).

Answer 1

Write IUPAC names of the following coordination compounds:

(i) \( [Ag(NH_3)_2][Ag(CN)_2] \)

Solution:
This compound consists of two different ions:
- The first ion is \( [Ag(NH_3)_2]^+ \), where \( Ag \) is silver and \( NH_3 \) is ammonia, a neutral ligand.
- The second ion is \( [Ag(CN)_2]^− \), where \( Ag \) is silver and \( CN \) is cyanide, a monodentate ligand.
The IUPAC name for this compound is Diamminesilver(I) cyanidosilver(I).

(ii) \( K_3[Fe(C_2O_4)_3] \)

Solution:
In this compound:
- The central metal ion is \( Fe^{3+} \), iron in the +3 oxidation state.
- The ligand \( C_2O_4^{2−} \) is oxalate, which is a bidentate ligand, and there are three oxalate ligands attached to the metal ion.
The IUPAC name for this compound is Potassium tris(oxalato)ferrate(III).