Structures Involving Polyatomic Molecules and Ions

Many compounds with a polyatomic cation and/or anion assume a rock salt-type structure. These range from KSH, KCN, and NH4I, where the polyatomic ions are fairly simple (see Table 7.9), to a more complicated example such as hexaam-minecobalt(III) hexachlorothallate(III), [Co(NH3)g] [TlClg], where both the cation and anion are complex ions. In all these cases, the anions assume an fee array and the cations occupy the octahedral holes. 

Examples where the cubic symmetry has been degraded are simply too numerous to be treated in a systematic way here. Two examples, however, are calcium 

Structures with polyatomic molecules or ions, (a) Dry ice, C02(s), with CO molecules in fee array. 

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