Sublimation of a quite special compound. This thing in the flask has a really large molecular weight, near to 500 but it could be purified easily with a simple trick, just heat it in vacuum while the other part of the flask is cooled with dry ice or liquid nitrogen.
The deep green color at the surface of the cold finger is exactly what we were looking for, perfectly pure, freshly sublimed compound.
Using Abderhalden’s drying pistol for something else than drying chemicals. In this case we dried a compound and purified it by sublimation. It is seen well that the compound formed beautiful crystals near to the glass joint where the tube was not heated by the boiling solvent (the whole apparatus could be seen here).
Next things to do: get out the crystals and find at least one piece that will be large and well shaped for an X-ray diffraction analysis to know that how does this compound looks like.
Subliming 4-amino-4H-1,2,4-triazole. It is quite interesting that a molecule with that much nitrogen in it does not decompose at even 160 °C, it only sublimes a bit. Sublimation is the transition of a substance directly from the solid to the gas phase without passing through an intermediate liquid phase.
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