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Opening Pandora’s Box: Chirality, Polymorphism, and Stoichiometric Diversity in Flurbiprofen/Proline Cocrystals

  • Natalia Tumanova
  • , Nikolay Tumanov
  • , Koen Robeyns
  • , Franziska Fischer
  • , Luca Fusaro
  • , Fabrice Morelle
  • , Voraksmy Ban
  • , Geoffroy Hautier
  • , Yaroslav Filinchuk
  • , Johan Wouters
  • , Tom Leyssens
  • , Franziska Emmerling

Research output: Contribution to journalArticlepeer-review

Abstract

Proline has been widely used for various cocrystallization applications, including pharmaceutical cocrystals. Combining enantiopure and racemic flurbiprofen and proline, we discovered 18 new crystal structures. Liquid-assisted grinding proved highly efficient to explore all the variety of crystal forms. A unique combination of state-of-the-art characterization techniques, comprising variable temperature in situ X-ray diffraction and in situ ball-milling, along with other physicochemical methods and density functional theory calculations, was indispensable for identifying all the phases. Analyzing the results of in situ ball-milling, we established a stepwise mechanism for the formation of several 1:1 cocrystals via an intermediate 2:1 phase. The nature of the solvent in liquid-assisted grinding was found to significantly affect the reaction rate and, in some cases, the reaction pathway.
Original languageEnglish
Pages (from-to)954-961
Number of pages8
JournalCrystal Growth and Design
Volume18
Issue number2
DOIs
Publication statusPublished - 4 Jan 2018

Funding

FundersFunder number
CISM
European Cooperation in Science and TechnologyCM1402
European Synchrotron Radiation Facility
Fonds De La Recherche Scientifique - FNRS
Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture
Paul Scherrer Institut
Université Catholique de Louvain

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