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首页> 外文期刊>Chemistry: A European journal >Self-assembled nanotapes of oligo(p-phenylene vinylene)s: Sol-gel controlled optical properties in fluorescent pi-electronic gels
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Self-assembled nanotapes of oligo(p-phenylene vinylene)s: Sol-gel controlled optical properties in fluorescent pi-electronic gels

机译：寡聚（对亚苯基亚乙烯基）s的自组装纳米带：荧光π电子凝胶中溶胶-凝胶控制的光学性质

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摘要

A rational approach to the design of supramolecular organogels of all-trans oligo(p-phenylene vinylene) (OPV) derivatives, a class of well-known organic semiconductor precursors, is reported. Self-assembly of these molecules induced gelation of hydrocarbon solvents at low concentrations (< 1 mm), resulting in high aspect ratio nanostructures. Electron microscopy and atomic force microscopy (AFM) studies revealed twisted and entangled supramolecular tapes of an average of 50-200 nm in width, 12-20 nm in thickness, and several micrometers in length. The hierarchical growth of the entangled tapes and the consequent gelation is attributed to the lamellar-type packing of the molecules, facilitated by cooperative hydrogen bonding, pi stacking, and van der Waals interactions between the OPV units. Gelation of OPVs induced remarkable changes in the absorption and emission properties, which indicated strong electronic interaction in the aggregated chromophores. Comparison of the absorption and emission spectra in the gel form and in the solid film indicated a similar chromophore organization in both phases. The presence of self-assembled aggregates of OPVs was confirmed by solvent- and temperature-dependent changes in the absorption and emission properties, and by selective excitation experiments. This is the first detailed report of the gelation-induced formation of OPV nanotapes, assisted by weak, nondirectional hydrogen-bonding motifs and pi-pi stacking. These findings may provide opportunities for the design of a new class of functional soft materials and nanoarchitectures, based on pi-conjugated organic semiconductor-type molecules, thereby enabling the manipulation of their optical properties.
机译：据报道，一种合理的设计全反式（对亚苯基亚乙烯基）（OPV）衍生物的超分子有机凝胶的方法是一类著名的有机半导体前体。这些分子的自组装诱导了低浓度（<1 mm）的烃类溶剂的凝胶化，从而产生了高纵横比的纳米结构。电子显微镜和原子力显微镜（AFM）研究表明，扭曲和纠缠的超分子带的平均宽度为50-200 nm，厚度为12-20 nm，长度为几微米。缠结带的分层生长和随之而来的凝胶化归因于分子的层状堆积，这是由OPV单元之间的协同氢键，π堆积和范德华相互作用所促进的。 OPVs的凝胶化引起吸收和发射特性的显着变化，这表明聚集的生色团中有很强的电子相互作用。凝胶形式和固体膜中吸收光谱和发射光谱的比较表明，在两个阶段中发色团的组织相似。 OPVs自组装聚集体的存在通过吸收和发射特性中溶剂和温度相关的变化以及选择性激发实验得到证实。这是凝胶诱导OPV纳米带形成的第一个详细报告，辅之以弱的，无方向性的氢键基序和pi-pi堆积。这些发现可能为基于π共轭有机半导体类型分子的新型功能性软材料和纳米结构的设计提供机会，从而能够操纵它们的光学性质。

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