Controlled self-assembly triggered by olefin metathesis: cross-linked graphitic nanotubes from an amphiphilic hexa-peri-hexabenzocoronene.
Acyclic diene metathesis (ADMET) in CH2Cl2 of 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, 2 did not self-assemble to form a tubular structure due to a high solubility in CH2Cl2. Although 2 formed 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 degrees C) higher than that of the uncross-linked version (195 degrees C) and preserved their hollow structure much longer upon heating.
Jin
Wusong
W
Aida Nanospace Project, Exploratory Research for Advanced Technology (ERATO), Japan Science and Technology Agency (JST), National Museum of Emerging Science and Innovation, 2-41 Aomi, Koto-ku, Tokyo 135-0064, Japan.
Fukushima
Takanori
T
Kosaka
Atsuko
A
Niki
Makiko
M
Ishii
Noriyuki
N
Aida
Takuzo
T