November 01, 2024, 05:40:36 AM
Forum Rules: Read This Before Posting


Topic: Lump of chemical  (Read 1642 times)

0 Members and 1 Guest are viewing this topic.

Offline anders94

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
Lump of chemical
« on: September 05, 2018, 07:55:26 AM »
Our lab ordered the radical TEMPO, but it arrived as a giant lump, which could be due to it melting during transport.
The chemical is supposed to be a powder. Was thinking of doing a recrystalisation, but don't know if there is something to consider before doing that for a radical.

Offline pgk

  • Chemist
  • Full Member
  • *
  • Posts: 892
  • Mole Snacks: +97/-24
Re: Lump of chemical
« Reply #1 on: September 06, 2018, 11:59:09 AM »
Probably, TEMPO (bp: 33-38oC) melted during transport and then, slowly re-frozen to form the giant lump. Besides, (accidental) absorption of humidity helps this kind of appearance.
Anyway, recrystallization of TEMPO (with some loss) is described in the link, below:
https://www.tcichemicals.com/en/gb/support-download/tcimail/backnumber/article/146drE.pdf
« Last Edit: September 06, 2018, 12:12:44 PM by pgk »

Offline wildfyr

  • Global Moderator
  • Sr. Member
  • ***
  • Posts: 1776
  • Mole Snacks: +203/-10
Re: Lump of chemical
« Reply #2 on: September 06, 2018, 12:30:58 PM »
Nah, go ahead an recrystallize. Or even just dissolve it in a good solvent and dump wholesale into a bad cold solvent to precipitate it and re-powderize it. Maybe ethanol into ether?

As always, try with a small amount first, then do the rest.

Sponsored Links