This work demonstrates the design of an in-plane polarized electric field induced by the hydrogen bonding and π–π stacking of amide-functionalized PDI supramolecules (sAmi-PDI), which are synthesized via a simple method in an acid medium. Acid-driven self-assembly is achieved via changing the local electrostatic interactions during intermolecular sAmi-PDI contact. A process that appropriately directs and accelerates the in-plane polarized electric field could improve the photoelectric separation efficiency. Moreover, π–π stacking and hydrogen-bond networks construct bridges for the molecule–molecule transfer of photogenerated electron–hole pairs, providing powerful assistance to enhance in-plane polarization. Meanwhile, the functionalized PDI molecules contain a large number of electron donors and acceptors in an acid medium; this is beneficial for improving the degree of self-assembly and providing a driving force for the efficient migration and separation of electron–hole pairs. Benefiting from the above-mentioned in-plane polarization and bridging role of electron–hole pairs, the photocatalytic performance of sAmi-PDI was dramatically enhanced almost 2-fold during the photodegradation of typical organic pollutants. Our results suggest that the enhanced photocatalytic activity could be attributed to fast carrier separation and migration caused by the in-plane polarized electric field, originating from hydrogen-bond networks and π–π stacking structures. This finding could provide a brand-new strategy for guiding the synthesis of PDI supramolecules with in-plane polarization, and could contribute to the construction of green, economical, and sustainable supramolecular materials.

中文翻译：

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官能化的PDI超分子的氢键键合和π–π堆叠诱导的面内极化，可有效地光催化降解有机污染物

这项工作演示了通过酰胺键化的PDI超分子（s Ami-PDI）的氢键键合和π–π堆叠诱导的面内极化电场的设计，该方法是在酸性介质中通过简单的方法合成的。酸驱动的自组装是通过改变分子间相互作用过程中的局部静电相互作用来实现的Ami-PDI联系人。适当地引导和加速面内极化电场的过程可以提高光电分离效率。此外，π-π堆积和氢键网络为光生电子-空穴对的分子-分子转移构建了桥梁，为增强平面内极化提供了有力的帮助。同时，官能化的PDI分子在酸性介质中含有大量的电子供体和受体。这有利于提高自组装程度，并为电子-空穴对的有效迁移和分离提供驱动力。得益于上述面内极化和电子-空穴对的桥接作用，s的光催化性能在典型的有机污染物的光降解过程中，Ami-PDI显着提高了近2倍。我们的结果表明，增强的光催化活性可以归因于平面内极化电场引起的快速载流子分离和迁移，该极化电场源自氢键网络和π-π堆积结构。这一发现可以提供一种指导平面内极化合成PDI超分子的全新策略，并有助于绿色，经济和可持续的超分子材料的构建。