Pinching polymorphs

Joel Bernstein

Research output: Contribution to journalReview articlepeer-review

31 Scopus citations


An organic molecular system having three polymorphic forms, two of which were optically indistinguishable but have different mechanical properties was described. The crystallization of 6-chloro-2,4-dinitroaniline in layered structure of nearly parallel layers with alternating separations of 3.057 and 3.209 Å was shown. A batch of chunky crystals were grown along with needle-like morphology and corrugated crystal structure. It was found that one form of the compound was easily deformed under an applied mechanical shear force and other strongly resisted such force. On further X-ray analysis, it was also found that first form corresponded to the expected layer, but the second corresponded to yet another polymorphic form.

Original languageEnglish
Pages (from-to)427-428
Number of pages2
JournalNature Materials
Issue number6
StatePublished - 1 Jan 2005

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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