Controlled self-assembly triggered by olefin metathesis:: Cross-linked graphitic nanotubes from an amphiphilic hexa-peri-hexabenzocoronene
Controlled self-assembly triggered by olefin metathesis:: Cross-linked graphitic nanotubes from an amphiphilic hexa-peri-hexabenzocoronene
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DOI：
10.1021/ja051859p
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发表时间：
2005-06-15
影响因子：
15
通讯作者：
Aida, T
中科院分区：
文献类型：
--
作者：
Jin, W;Fukushima, T;Aida, T
在CH2Cl2中，Gemini型非离子六苯并冠烯两亲物（2）的无环二烯复分解（ADMET）导致自发形成具有交联表面的石墨纳米管，该两亲物带有末端烯丙基官能团的三甘醇链。在没有ADMET的情况下，由于在CH2Cl2中的高溶解度，2不能自组装形成管状结构。尽管2在THF中形成了纳米管，但在THF中预形成的纳米管表面上的ADMET仅缓慢地进行，并导致管状结构的部分破坏。交联的纳米管显示出比未交联的版本（195 °C）更高的软化温度（244 °C），并且在加热时保持其中空结构更长时间。
Acyclic diene metathesis (ADMET) in CH2Cl2of a Gemini-shaped nonionic hexabenzocoronene amphiphile (2), bearing triethylene glycol chains with terminal allylic functionalities, resulted in spontaneous formation of graphitic nanotubes with a cross-linked surface. Without ADMET,2did not self-assemble to form a tubular structure due to a high solubility in CH2Cl2. Although2formed nanotubes in THF, ADMET on the surface of the preformed nanotubes in THF proceeded only sluggishly and resulted in partial disruption of the tubular structure. The cross-linked nanotubes showed a softening temperature (244 °C) higher than that of the uncross-linked version (195 °C) and preserved their hollow structure much longer upon heating.