A Fluorescent Organic Nanotube Assembled from Novel p-Phenylene Ethynylene-Based Dicationic Amphiphiles

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• 作者：Ai-Jan Chen ; I-Jui Hsu ; Wei-Yi Wu ; Yu-Tse Su ; Fu-Yu Tsai ; Chung-Yuan Mou
• 刊名：Langmuir
• 出版年：2013
• 出版时间：February 26, 2013
• 年：2013
• 卷：29
• 期：8
• 页码：2580-2587
• 全文大小：424K
• 年卷期：v.29,no.8(February 26, 2013)
• ISSN：1520-5827

文摘

Novel 蟺鈥揺xtended conjugated amphiphiles composed of a hydrophilic section of two quaternary ammonium groups and p-phenylene ethynylene with adjustable alkyl chain hydrophobic section were prepared by a multistep synthesis. These dicationic amphiphiles showed good water solubility and formed a tubular assembly in water. The evidence for the nanotubular comes from direct optical and TEM observations. A strong 蟺鈥撓€ stacking interaction between neighboring molecules, as evidenced by the red-shift and self-quenching in fluorescence, is proposed for the self-assembly. At the same time, dehydration of the bromide led to strong counterion condensation in headgroups, which resulted in the small curvature structure of the nanotubes. A bilayer lamellar structural model for the organic nanotube is proposed, and a reasonable structural model based on the experimental XRD pattern, as well as cell constants, is proposed.