Thermal hysteresis exhibited by synthetic helical molecule: Memory effect at molecular level

Masanori Shigeno, Masahiko Yamaguchi

研究成果: Article査読

抄録

Thermal hysteresis is a phenomenon, in which different responses occur during heating and cooling. Although bulk materials can exhibit thermal hysteresis by strong and multiple cooperative interactions between molecules, thermal hysteresis at molecular level in nonpolar organic solvents was essentially not known until now. We found that a chiral sulfonamido helicene tetramer forms a helix dimer in 1,3-difluorobenzene, which unfolds to a random coil on heating. This structural change exhibited thermal hysteresis, in which different structures of a helix dimer and a random coil were formed during heating and cooling at the same temperature. The phenomenon was explained by the different populations of helix dimers and random coils at the same temperature, and by the presence of induction periods. Thermal hysteresis is related to the "memory effect": the molecules memorize their thermal history, whether they were heated or cooled in the past. The model can also explain the "memory effect".

本文言語English
ページ(範囲)511-512
ページ数2
ジャーナルKobunshi
62
9
出版ステータスPublished - 2013 9 1

ASJC Scopus subject areas

  • 化学工学(全般)

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