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首页> 外文期刊>Chemistry: A European journal >Wide-range light-harvesting donor-acceptor assemblies through specific intergelator interactions via self-assembly
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Wide-range light-harvesting donor-acceptor assemblies through specific intergelator interactions via self-assembly

机译：通过自组装通过特定的凝胶间相互作用实现大范围采光的供体-受体组装

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We have synthesized two new low-molecular-mass organogelators based on tri-p-phenylene vinylene derivatives, one of which could be designated as the donor whereas the other one is an acceptor. These were prepared specifically to show the intergelator interactions at the molecular level by using donor-acceptor self-assembly to achieve appropriate control over their macroscopic properties. Intermolecular hydrogen-bonding, π-stacking, and van der Waals interactions operate for both the individual components and the mixtures, leading to the formation of gels in the chosen organic solvents. Evidence for intergelator interactions was acquired from various spectroscopic, microscopic, thermal, and mechanical investigations. Due to the photochromic nature of these molecules, interesting photophysical properties, such as solvatochromism and J-type aggregation, were clearly observed. An efficient energy transfer was exhibited by the mixture of donor-acceptor assemblies. An array of four chromophores was built up by inclusion of two known dyes (anthracene and rhodamine 6G) for the energy-transfer studies. Interestingly, an energy-transfer cascade was observed in the assembly of four chromophores in a particular order (anthracene-donor-acceptor-rhodamine 6G), and if one of the components was removed from the assembly the energy transfer process was discontinued. This allowed the build up of a light-harvesting process with a wide range. Excitation at one end produces an emission at the other end of the assembly. Join the cascade! Intergelator interactions between two p-phenylene-vinylene-based, low-molecular-mass gelators formed through donor-acceptor assembly have been demonstrated. A cascade energy transfer was described in an assembly of four different chromophores in a particular order. In this assembly, excitation at the first chromophore produces an emission at the fourth, thus establishing a wide-range light-harvesting process (see figure).
机译：我们基于三对亚苯基亚乙烯基衍生物合成了两种新型的低分子有机胶凝剂，其中一种可以指定为供体，而另一种可以是受体。通过使用供体-受体自组装来实现对其宏观性能的适当控制，专门制备了这些分子以显示分子水平上的凝胶间相互作用。分子间的氢键键合，π堆积和范德华力相互作用对单个组分和混合物均起作用，从而导致在所选的有机溶剂中形成凝胶。胶凝剂相互作用的证据来自各种光谱学，微观，热学和机械学研究。由于这些分子的光致变色性质，清楚地观察到了有趣的光物理性质，例如溶剂变色和J型聚集。供体-受体组件的混合物显示出有效的能量转移。通过包含两种已知的染料（蒽和罗丹明6G）来构建四个发色团，以进行能量转移研究。有趣的是，在四个生色团的组装过程中，以特定顺序（蒽-供体-受体-罗丹明6G）观察到了能量转移级联，如果从该组分中除去一种组分，则会中断能量转移过程。这允许建立广泛的光收集过程。一端的激励在组件的另一端产生辐射。加入小瀑布！已经证明了通过供体-受体组装形成的两个对亚苯基-亚乙烯基的低分子质量胶凝剂之间的胶凝剂相互作用。在四个不同的生色团的组装中以特定顺序描述了级联能量转移。在该组件中，第一个生色团的激发在第四个生色团产生发射，因此建立了宽范围的光收集过程（见图）。

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