Photomodulated Supramolecular Chirality in Achiral Photoresponsive Rodlike Compounds Nanosegregated from the Helical Nanofilaments of Achiral Bent-Core Molecules

Kibeom Kim, Hanim Kim, Seong Yong Jo, Fumito Araoka, Dong Ki Yoon, Suk Won Choi

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We prepared a nonchiral mixture of achiral bent-core molecules and photoresponsive rodlike liquid crystalline (LC) molecules. With the help of the isothermal photochemical nematic (N)-isotropic (Iso) phase transition of the photoresponsive rodlike LC molecules, the corresponding phase transition from a dark conglomerate BX phase to another distinguishable dark conglomerate B4 phase took place in the mixture. A large circular dichroism (CD) signal originating from supramolecular chirality was detected in the initial BX phase. On the other hand, the detected CD signal was decreased in the B4 phase after UV irradiation. Interestingly, the decreased CD signal could be reverted to the initial CD signal with visible irradiation. This chiroptical process revealed in this work was stable and reversible and thus opens up the possibility of practical applications such as rewritable optical storage.

Original languageEnglish (US)
Pages (from-to)22686-22691
Number of pages6
JournalACS Applied Materials and Interfaces
Volume7
Issue number40
DOIs
StatePublished - Oct 14 2015

Keywords

  • bent-core
  • chirality
  • chiroptical switching
  • circular dichroism
  • helical nanofilament
  • liquid crystal

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