Synthesis, self-assembly, and characterization of supramolecular polymers from electroactive dendron rodcoil molecules
Synthesis, self-assembly, and characterization of supramolecular polymers from electroactive dendron rodcoil molecules
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DOI：
10.1021/ja049325w
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发表时间：
2004-11-10
影响因子：
15
通讯作者：
Stupp, SI
中科院分区：
文献类型：
--
作者：
Messmore, BW;Hulvat, JF;Stupp, SI
我们在这里报告的合成和自组装的一系列的三个分子与树枝状棒状螺旋结构，含有共轭段的寡（噻吩），寡（亚苯基-亚乙烯基），寡（亚苯基）。尽管它们的结构不同，但所有三种分子都产生类似的自组装结构。电子和原子力显微镜揭示了自组装成高纵横比的带状纳米结构，在低浓度诱导凝胶化的非极性溶剂中的分子。自组装导致吸收光谱蓝移和荧光光谱红移、猝灭，表明带状结构内共轭链段的聚集。将这些分子组装成一维纳米结构是制备具有有机电子功能的π-π堆叠超分子聚合物的一条途径。在低聚（噻吩）衍生物中，自组装导致碘掺杂膜的电导率由于自组装而增加3个数量级。我们还发现，这些超分子组件的电场排列可以用于在器件衬底上创建自组装纳米线阵列。
We report here the synthesis and self-assembly of a series of three molecules with dendron rodcoil architecture that contain conjugated segments of oligo(thiophene), oligo(phenylene-vinylene), and oligo(phenylene). Despite their structural differences, all three molecules yield similar self-assembled structures. Electron and atomic force microscopy reveals the self-assembly of the molecules into high aspect ratio ribbon-like nanostructures which at low concentrations induce gelation in nonpolar solvent. Self-assembly results in a blue-shifted absorption spectrum and a red-shifted, quenched fluorescence spectrum, indicating aggregation of the conjugated segments within the ribbon-like structures. The assembly of these molecules into one-dimensional nanostructures is a route to pi-pi stacked supramolecular polymers for organic electronic functions. In the oligo(thiophene) derivative, self-assembly leads to a 3 orders of magnitude increase in the conductivity of iodine-doped films due to self-assembly. We also found that electric field alignment of these supramolecular assemblies can be used to create arrays of self-assembled nanowires on a device substrate.