Overall recommended test:
The gold bromide reagent gives the most distinct crystals for 5-IAI but the crystals are very thick and do not easily give informative IR spectra. However, the spectra can be obtained when the crystals are chosen carefully. The acidic gold chloride reagent is recommended for a combined test because of the distinct crystals observed and their suitability for IR microspectroscopy.
Browse the 5-IAI Collections:
5-IAI in 5% HAuCl₄ in 1:2 concentrated H₂SO₄: H₂0
5-IAI in Gold Bromide (HAuBr₄)