Cooling-rate dependent single-crystal-to-single-crystal phase transition in an organic co-crystal

Adam W. Crawford, Ryan H. Groeneman, Daniel K. Unruh, Kristin M. Hutchins

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We investigate a previously unobserved phase transition in an organic co-crystal containing the olefin trans-1,2-bis(4-pyridyl)ethylene. The olefin undergoes molecular motion in the crystalline state, and converts from a disordered to ordered phase upon cooling. Ordering causes a unit cell change to occur via a reversible single-crystal-to-single-crystal (SCSC) transformation. The ordered phase is only accessed via slow cooling; flash cooling locks the crystal in a kinetically trapped, disordered state, and SCSC reversibility is lost. The common practice of flash cooling may inhibit access to thermodynamic products and unique phases.

Original languageEnglish
Pages (from-to)3258-3261
Number of pages4
JournalChemical Communications
Volume55
Issue number22
DOIs
StatePublished - 2019

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