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首页> 外文期刊>Chemistry: A European journal >Dendronized Triangular Oligo(phenylene ethynylene) Amphiphiles:Nanofibrillar Self-Assembly and Dye ACHTUNGTRENUNGEncapsulation
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Dendronized Triangular Oligo(phenylene ethynylene) Amphiphiles:Nanofibrillar Self-Assembly and Dye ACHTUNGTRENUNGEncapsulation

机译：树枝化的三角形低聚（亚苯基乙炔）两亲物：纳米原纤维的自组装和染料乙酰酮包封

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摘要

Triangular-shaped oligo(phenyleneethynylene) amphiphiles 1a and 1b decorated in their periphery with two- and four-branched hydrophilic triethyleneglycol dendron wedges, have been synthesized and their self-assembling properties in solution and onto surfaces investigated. The steric demand produced by the dendritic substituents induces a face-to-face rotated p stacking of the aromatic moieties. Studies on the concentration and temperature dependence confirm this mechanism and provide binding constants of 1.2105 and 1.7105m1 in acetonitrile for 1a and 1b, respectively.Dynamic and static light scattering measurements complement the study of the self-assembly in solution and demonstrate the formation of rod-like supramolecular structures in aqueous solution. The nanofibers formed in solution can be efficiently transferred onto surfaces. Thus, TEM images reveal the presence of strands of various thickness, with the most common being several micrometers long and with diameters of around 70 nm. Some of these nanofibers present folded edges that are indicative of their ribbon-like nature. Interestingly, compound 1b can also form thick filaments with a rope-like appearance, which points to a chiral arrangement of the fibers. AFM images under highly diluted conditions also reveal long fibers with height profiles that fit well with the molecular dimensions calculated for both amphiphiles. Finally, we have demonstrated the intercalation of the hydrophobic dye Disperse Orange 3 within the filaments and its subsequent release upon increasing the temperature.
机译：已经合成了三角形的低聚（亚苯基亚乙炔基）两亲物1a和1b，它们在外围装饰了两支和四支亲水性三乙二醇树枝状楔形物，并研究了它们在溶液和表面上的自组装性能。由树枝状取代基产生的空间需求引起芳族部分的面对面旋转p堆积。对浓度和温度依赖性的研究证实了这种机理，并提供了1a和1b分别在乙腈中的1.2105和1.7105ml的结合常数。动态和静态光散射测量补充了溶液中自组装的研究并证明了棒的形成水溶液中的类超分子结构。溶液中形成的纳米纤维可以有效地转移到表面上。因此，TEM图像显示存在各种厚度的股线，最常见的股线长度为几微米，直径约为70 nm。这些纳米纤维中的一些呈现折叠的边缘，这表明它们的带状性质。有趣的是，化合物1b还可以形成具有绳状外观的粗长丝，这表明纤维的手性排列。在高度稀释的条件下，AFM图像还显示出具有高度轮廓的长纤维，该高度轮廓与两个两亲物的分子尺寸都非常吻合。最后，我们证明了疏水染料分散橙3在细丝中的嵌入及其在温度升高时的释放。

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