Molecular function of counting the numbers 1 and 2 exhibited by a sulfoneamidohelicene tetramer

Masanori Shigeno, Yo Kushida, Yuta Kobayashi, Masahiko Yamaguchi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The sulfoneamidohelicene tetramer in solution exhibits different molecular responses to the same cooling stimulus delivered once and twice under thermal hysteresis conditions. Its random-coil state at a high temperature was cooled and maintained at a given temperature for which its molecules remained in a random coil (first cooling); the resulting solution was heated and cooled, after which a helix dimer formed (second cooling). Such a property can be regarded as a molecular function of counting the numbers 1 and 2. Chemistry that counts! The sulfoneamidohelicene tetramer in solution responds not to the first cooling stimulus but to the second under thermal hysteresis conditions; this changes the structure from a random coil to a helix dimer (see figure; Boc=tert-butoxycarbonyl). This is a molecular function of counting the numbers 1 and 2.

Original languageEnglish
Pages (from-to)12759-12762
Number of pages4
JournalChemistry - A European Journal
Volume20
Issue number40
DOIs
Publication statusPublished - 2014 Sep 26

Keywords

  • counting
  • helical structures
  • sulfonamides
  • thermal hysteresis
  • threshold

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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