Molecular Thermal Hysteresis in Helix-Dimer Formation of Sulfo namidohelicene Oligomers in Solution.
Molecular Thermal Hysteresis in Helix-Dimer Formation of Sulfo namidohelicene Oligomers in Solution.
复制标题
溶液中磺基纳米螺旋烯低聚物形成螺旋二聚体的分子热滞后。
DOI：
10.1002/chem.201204556
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
山口 雅彦
中科院分区：
文献类型：
--
作者：
重野 真徳;串田 陽;山口 雅彦
通过结构单元的重复偶联反应合成高达九聚物水平的磺酰胺螺旋烯低聚物。四聚体在 1,3-二氟苯中形成螺旋二聚体，加热后展开成无规卷曲。这种结构变化表现出热滞后，在温度升高和降低的过程中观察到不同的热响应。研究了不同加热/冷却模式下的滞后特征，并根据群体变化和诱导期的存在讨论了其机制。还给出了关于使用热滞来感测温度升高/降低的建议。
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.