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Auric iodide, AuI3

Gradual addition of a solution of auric chloride to one of potassium iodide yields complex AuI4-ions, converted by further addition of auric chloride into auric iodide:

3AuI4' + Au••• = 4Aul3.

On drying, the dark-green product decomposes into aurous iodide and iodine. It is soluble with difficulty in water to an unstable solution.

A complex iodide having the formula CsI,AuI3 is produced in glistening, black crystals by the interaction of gold dichloride and caesium iodide.

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