Inverse thermoresponse of a water-soluble helicene oligomer in aqueous-organic mixed solvent systems
Inverse thermoresponse of a water-soluble helicene oligomer in aqueous-organic mixed solvent systems
复制标题
DOI：
10.1016/j.tet.2017.08.046
复制
发表时间：
2017-10-19
期刊：
影响因子：
2.1
通讯作者：
Yamaguchi, Masahiko
中科院分区：
文献类型：
--
作者：
Saito, Nozomi;Kobayashi, Higashi;Yamaguchi, Masahiko
含TEG基团的乙炔基螺烯（M）-四聚体在水/三乙胺/丙酮体系中表现出相反的热响应，即加热诱导双螺旋的形成和冷却解离。在这项研究中，我们研究了在5和40摄氏度之间的温度下，水含量的溶剂效应，并表明在不同的水溶液系统中发生了逆热响应。在丙酮中，寡聚体表现出普通的热响应：冷却诱导双螺旋的形成和加热解离。水含量增加到约10%导致转换到逆热响应。进一步增加抑制的协会，并没有引起的温度反应。当含水量增加到约50%时，出现了先前研究观察到的逆热响应。两种类型的逆温度响应，被称为I型和II型，分别出现在高和低水分含量。(C)2017由Elsevier Ltd.出版
A water-soluble ethynylhelicene (M)-tetramer with TEG groups exhibited the inverse thermoresponse in water/triethylamine/acetone, in which heating induced the formation of double helix and cooling dissociation. In this study, we examined the solvent effect with regard to water content at temperatures between 5 and 40 degrees C, and showed that the inverse thermoresponse occurred in different aqueous solution systems. In acetone, the oligomer exhibited the ordinary thermoresponse: Cooling induced the formation of double helix and heating dissociation. The increase in water content to approximately 10% caused the switch to the inverse thermoresponse. Further increase inhibited the association, and did not induce the thermoresponse. When the water content was increased to approximately 50%, the inverse thermoresponse appeared as observed previously study. Two types of inverse thermoresponses, termed type I and II, appeared at high and low water contents, respectively. (C) 2017 Published by Elsevier Ltd.