Looks OK although with the resolution of the photo it's hard to tell. The main thing is to avoid having any dark red, purple or black specks in the dish. Perhaps there's one at the bottom of the picture towards the middle?
The main thing is that the yellow oily stuff is still about 99% DMT, as determined by analysis. It just does that sometimes for a variety of reasons.
EDIT:
I just put another extraction in the freezer for it to dry off.
Hang on, did you get these crystals from evaporation or freeze precipitation? In case of the former, it seems like the freezer is a strange choice of place to dry the crystals off.
If the latter, it's a good idea to cover and invert the dish to allow the residual naphtha to drip off before finally removing from the freezer to air dry, waiting until the dish has warmed up before removing the cover in order to minimise condensation on the crystals.
Looks like the oil is hardening up. Likely it was due to residual naphtha. But you do seem to have some pink spots in there which look like base solution droplets have come over. If you think this is the case, I'd strongly suggest you recrystallise from heptane or light petroleum ether.
Maybe you know this, but an easy way of circumventing base liquid carry-over is to put the separated naphtha into a holding jug before carefully transferring it to the precipitation dish.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.