The reaction of hexaaquacopper(III) and ammonia produces a complex ion and water. This reaction can occur because ammonia has a lone pair of electrons. Amines can also react in similar ways because of their lone pair of electrons.
The initial reaction between hexaaquacopper(III) and butylamine produces a pale blue precipitate.
The complex ion formed from the reaction of hexaaquacopper(III) and butylamine reacts in excess butylamine to form a deepblue solution.
