Figure-eight thermal hysteresis of aminomethylenehelicene oligomers with terminal C16 alkyl groups during hetero-double-helix formation

Tsukasa Sawato, Rina Iwamoto, Masahiko Yamaguchi

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1 Citation (Scopus)

Abstract

1 : 1 mixtures of aminomethylenehelicene (P)-tetramer and (M)-pentamer with terminal C16 alkyl groups in fluorobenzene showed structural changes between hetero-double-helices B and C and random-coils 2A. Figure-eight thermal hysteresis appeared when the solution was cooled and heated at a constant rate and involved the crossing of cooling and heating curves in Δϵ/temperature profiles. This unusual thermal hysteresis emerged in the intermediate state between counterclockwise and clockwise thermal hystereses. This phenomenon arose from the competition between self-catalytic reactions to form B and C from 2A. Significant effects of terminal C16 alkyl groups on the thermodynamic and kinetic phenomena are also described.

Original languageEnglish
Pages (from-to)3290-3300
Number of pages11
JournalChemical Science
Volume11
Issue number12
DOIs
Publication statusPublished - 2020 Mar 28

ASJC Scopus subject areas

  • Chemistry(all)

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