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- Title
Helical Polybissilsesquioxane Bundles Prepared Using a Self-Templating Approach.
- Authors
Wang, Qingfeng; Lin, Shuwei; Qin, Jiaming; Li, Yi; Li, Baozong; Yang, Yonggang
- Abstract
Polybissilsesquioxanes with single-handed helical morphologies attracted much attention during the last decade, which could be applied as asymmetric catalysts and chiral stationary phases. Herein, a pair of chiral biphenylene-bridged bissilsesquioxanes were synthesized. They self-assembled into helical bundles in ethanol, behavior that was confirmed in field emission scanning electron microscopy images. Circular dichroism analysis indicated that the biphenylene groups twisted in a single-handed fashion. Single-handed helical polybissilsesquioxane bundles were prepared via polycondensation of the bissilsesquioxanes, using a self-templating approach. Because of the shrinkage that occurred during polycondensation, the helical pitches of the bundles were shorter than those of their corresponding organic self-assemblies. The wide-angle X-ray diffraction pattern indicated that there were no p-p interactions among the diphenylene groups. The circular dichroism spectra indicated that the chirality was successfully transferred from the bissilsesquioxane self-assemblies to the polybissilsesquioxane. The polybissilsesquioxanes displayed a capacity for the adsorption of nitrobenzene and had potential application for enantioseparation.
- Subjects
CHIRALITY; CATALYSTS; OPTICAL rotation; CIRCULAR dichroism; POLYCONDENSATION; MATHEMATICAL models
- Publication
Chirality, 2016, Vol 28, Issue 1, p44
- ISSN
0899-0042
- Publication type
Article
- DOI
10.1002/chir.22533