Two forms of crystals are observed for aqueous solution of 3,4-MDPV with gold chloride reagent. Sheaves of short yellow rods and tight clusters of colorless flat, thick plates are formed at substance amounts of 10 μg. Both forms of crystals form within 15 minutes of mixing the reagent in. This reagent is the best reagent for 3,4-MDPV among the gold based reagents. The crystals are sturdy and suitable for infrared spectroscopy. The crystals with the clusters of thick plates offers good features for infrared microspectroscopy in transmission mode.
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