Organic glasses with tunable liquid-crystalline order through kinetic arrest of end-over-end rotation: The case of saperconazole

Zhenxuan Chen, Junguang Yu, Rattavut Teerakapibal, Lieven Meerpoel, Ranko Richert, Lian Yu

Research output: Contribution to journalArticle

Abstract

Liquid crystals (LCs) undergo fast phase transitions, almost without hysteresis, leading to the notion that it is difficult to bypass LC transitions. However, recent work on itraconazole has shown that a nematic-to-smectic phase transition can be frustrated or avoided at moderate cooling rates. At each cooling rate, the highest smectic order obtained is determined by the kinetic arrest of the end-over-end molecular rotation. We report that the same phenomenon occurs in the system saperconazole, an analog of itraconazole where each of the two Cl atoms is replaced by F. Saperconazole has a wider temperature range over which smectic order can develop before kinetic arrest, providing a stronger test of the previous conclusion. Together these results indicate a general principle for controlling LC order in organic glasses for electronic applications.

Original languageEnglish (US)
Pages (from-to)2025-2030
Number of pages6
JournalSoft Matter
Volume16
Issue number8
DOIs
StatePublished - Feb 28 2020
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

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