Antisolvent addition at extreme conditions

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Abstract

This article describes the use of antisolvent addition at high-pressure to aid precipitation and recovery of high-pressure phases to ambient pressure. Paracetamol (PCM) was used as a model system to demonstrate the principle due to the extensive literature of paracetamol at high-pressure and ambient pressure. We have observed that we are able to recover the orthorhombic form of paracetamol to ambient pressure using this technique, although solvent-mediated transformations are a hurdle. During this investigation we observed a new methanol solvate of paracetamol that is simlar in structure to the known form. The methanol solvate is stable to 0.2 GPa before transformation to the orthorhombic form that is known to be the stable form at high pressure.
Original languageEnglish
Pages (from-to)4437-4443
Number of pages7
JournalCrystEngComm
Volume21
Issue number30
Early online date29 Apr 2019
DOIs
Publication statusPublished - 14 Aug 2019

Keywords

  • paracetamol
  • pressure
  • metastable
  • antisolvent
  • crystallization
  • polymorph
  • solution-mediated transformation
  • high-pressure

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