2-EMC with the aqueous gold chloride reagent gives characteristic large clear crystals. The crystals grow as large, thick tablets that are stacked. The crystals are very bright under crossed polars. 2- EMC residue (5 μg) can be dissolved in either water, 10% hydrochloric acid, or 10% acetic acid to achieve the described crystals.
The crystals are very well-suited for single crystal infrared spectroscopy. The easy to acquire IR spectra are information-rich with the crystal spectra being very similar to the drug standard.
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