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Molecular Thermal Hysteresis in Helix‐Dimer Formation of Sulfonamidohelicene Oligomers in Solution
Author(s) -
Shigeno Masanori,
Kushida Yo,
Yamaguchi Masahiko
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201204556
Subject(s) - dimer , hysteresis , tetramer , thermal hysteresis , helix (gastropod) , thermal , materials science , population , crystallography , chemical physics , chemistry , thermodynamics , condensed matter physics , phase transition , physics , organic chemistry , ecology , demography , sociology , enzyme , biology , snail
Sulfonamidohelicene oligomers up to the nonamer level were synthesized by the repeated coupling reactions of a building block. A tetramer formed a helix dimer in 1,3‐difluorobenzene, which unfolded to a random coil with heating. This structural change exhibited thermal hysteresis in which different thermal responses were observed in the course of temperature increase and decrease. The feature of the hysteresis was examined under different heating/cooling modes, and the mechanisms are discussed on the basis of the population change and the presence of an induction period. A proposal regarding the use of thermal hysteresis for sensing a temperature increase/decrease is also given.