The heliconical nematic twist-bend phase from “classic” bent-core benzylideneanilines with oligomethylene cores

Alyssa N. ScarbroughDepartment of Chemistry and Biochemistry and Soft Materials Research Center, University of Colorado, Boulder, CO, USA

Michael R. TuchbandDepartment of Physics and Soft Materials Research Center, University of Colorado, Boulder, Colorado, USA

Eva D. KorblovaDepartment of Chemistry and Biochemistry and Soft Materials Research Center, University of Colorado, Boulder, CO, USA

Renfan ShaoDepartment of Physics and Soft Materials Research Center, University of Colorado, Boulder, Colorado, USA

Yongqiang ShenDepartment of Physics and Soft Materials Research Center, University of Colorado, Boulder, Colorado, USA

Joseph E. MaclennanDepartment of Physics and Soft Materials Research Center, University of Colorado, Boulder, Colorado, USA

Matt A. GlaserDepartment of Physics and Soft Materials Research Center, University of Colorado, Boulder, Colorado, USA

Noel A. ClarkDepartment of Physics and Soft Materials Research Center, University of Colorado, Boulder, Colorado, USA

David M. WalbaDepartment of Chemistry and Biochemistry and Soft Materials Research Center, University of Colorado, Boulder, CO, USACorrespondence[email protected]

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ABSTRACT

We report the synthesis and properties of several new heliconical twist-bend nematic (N_TB) bimesogens possessing “classic” bent-core benzylideneaniline wings combined with oligomethylene spacers of odd parity. While short alkoxy tails combined with a resorcinol diester core in the classic system appear to give SmA phases (not B2 phases), in the present system, methoxy or ethoxy tails exhibit the N_TB phase as evidenced by textural analysis. Several of these compounds also exhibit microscopic helical defect structures in the N_TB phase, which have been reported in other lamellar and pseudo-lamellar liquid crystal phases, but not in the N_TB phase.

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The heliconical nematic twist-bend phase from “classic” bent-core benzylideneanilines with oligomethylene cores

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The heliconical nematic twist-bend phase from “classic” bent-core benzylideneanilines with oligomethylene cores

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