Helical transfer through nonlocal interactions.
A pair of chiral bola-type enantiomers, ll-12PyBr and dd-12PyBr, was synthesized. They can cause physical gels in pure water. Sol-gel transcriptions were carried out to control mesoporous 1,4-phenylene-silica nanostructures and helicity using the organic self-assemblies of these amphiphiles as templates. Under acidic conditions, left-handed helical 1,4-phenylene-silica bundles were prepared using the self-assemblies of ll-12PyBr as templates. Additionally, right-handed helical silica and 1,4-phenylene-silica bundles were prepared using the self-assemblies of dd-12PyBr as templates. Under basic conditions, 1,4-phenylene-silica bundles were also obtained. However, it is hard to determine the handedness. For all of the 1,4-phenylene-silica bundles, it is interesting to find that the aromatic rings are packing in helix within the wall of the pore channels. Powder X-ray diffraction patterns indicated that the aromatic rings of 1,4-phenylene-silica bundles prepared under basic conditions showed a greater degree of order than those of 1,4-phenylene-silica bundles prepared under acidic conditions. Moreover, helical silica, 1,3-phenylene-silica, ethene-silica, and ethane-silica bundles were also prepared using the self-assemblies ll-12PyBr and dd-12PyBr as templates.
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
Xiaojian
X
Wu
Sunjun
S
Ji
Yi
Y
Li
Baozong
B
Li
Xiulin
X
Zhu
Kenji
K
Hanabusa
Yonggang
Y
Yang
D000143:Acids / Q000737:chemistry; D005782:Gels / Q000138:chemical synthesis / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D044367:Phase Transition; D016062:Porosity; D053838:Scattering, Small Angle; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry*; D013237:Stereoisomerism; D013696:Temperature; D014961:X-Ray Diffraction
C541540:1,4-phenylene-silica; D000143:Acids; D005782:Gels; D012822:Silicon Dioxide