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What is observed is is that ammonia acts as a base and precipitates iron(III) solutions as iron(III) hydroxide. Similar problems are encounteerd with iron(II).

The underlying reason is that iron(III) does not bond strongly to N donors. iron(II) also does not bond strongly.

It is possible to make the [Fe(NH3)6] 3+ ion and I suspect that this is made in liquid ammonia, avoiding the probelm of interaction with water. Certainly other iron(II) salts dissolve in liquid ammonia to give ammine complexes although some are quite unstable.

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