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Molecular function of counting the numbers 1 and 2 exhibited by a sulfoneamidohelicene tetramer
Masanori Shigeno1, Yo Kushida, Yuta Kobayashi
1Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University 6-3 Aoba, Sendai 980-8578 (Japan), Fax: (+81) 22-795-6811.
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.
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