Molecular Thermal Hysteresis in Helix-Dimer Formation of Sulfonamidohelicene Oligomers in Solution
作者:Masanori Shigeno、Yo Kushida、Masahiko Yamaguchi
DOI:10.1002/chem.201204556
日期:2013.7.29
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
通过结构单元的重复偶联反应合成高达九聚体水平的磺酰胺基次甲基低聚物。一个四聚体在1,3-二氟苯中形成一个螺旋二聚体,加热时会展开为无规卷曲。这种结构变化表现出热滞现象,其中在温度升高和降低的过程中观察到不同的热响应。在不同的加热/冷却模式下检查了磁滞的特征,并基于种群变化和诱导期的存在来讨论了机理。还提出了关于使用热滞来感测温度升高/降低的建议。