Multi-functional materials have received wide attention due to their potential applications in various fields; therefore, developing a simple and easy strategy for the preparation of multi-functional materials is an interesting issue. In this work, a novel supramolecular gel, TP-QG, has been successfully constructed via the assembly of a simple methoxyl-pillar[5]arene host (TP) and a tripodal (tri-pyridine-4-yl)-amido-benzene guest (Q). Interestingly, TP-QG could act as a multi-functional material and showed strong fluorescence, good self-healing, host–guest stimuli-responsiveness and conductive properties. Due to these properties, TP-QG shows a fascinating application prospect. For instance, TP-QG could exhibit ultrasensitive fluorescence response for Fe³⁺ and F⁻ in water via the fluorescence “ON–OFF–ON” pathway; the lowest detection limit (LOD) of TP-QG for Fe³⁺ was 2.32 × 10⁻¹⁰ M and the LOD of TP-QG-Fe for F⁻ was 4.30 × 10⁻⁸ M. These properties permit TP-QG to act as not only a Fe³⁺ and F⁻ sensor, but also an “ON–OFF–ON” fluorescence display material and an efficient logic gate. Meanwhile, the xerogel of TP-QG could remove Fe³⁺ from water, and the adsorption ratio was 98.68%; the xerogel of TP-QG-Fe could also remove F⁻ from water; the removal ratio was about 87.92%. This work provides a feasible way to construct multi-functional smart materials by host–guest assembly.

中文翻译：

---

一种简单的柱[5]芳烃组装多功能材料，具有超灵敏传感、自愈、导电和主客体刺激响应特性

多功能材料因其在各个领域的潜在应用而受到广泛关注；因此，开发一种简单易行的多功能材料制备策略是一个有趣的问题。在这项工作中，通过简单的甲氧基-柱[5]芳烃主体（TP）和三足（tri-pyridine-4-yl）-淀粉-苯的组装成功构建了新型超分子凝胶TP-QG客人（Q）。有趣的是，TP-QG可以作为一种多功能材料，显示出强荧光、良好的自愈性、主客体刺激响应性和导电性能。由于这些特性，TP-QG显示出迷人的应用前景。例如，TP-QG可以通过“ON-OFF-ON”荧光通路对水中的Fe ³⁺和 F ^-表现出超灵敏的荧光响应；TP-QG对 Fe ³⁺的最低检测限 (LOD)为 2.32 × 10 ^-10 M，TP-QG-Fe对 F ^-的最低检测限 (LOD)为 4.30 × 10 ^-8 M。这些特性允许TP-QG起作用不仅作为 Fe ³⁺和 F ^-传感器，而且作为“ON-OFF-ON”荧光显示材料和高效的逻辑门。同时，TP-QG的干凝胶能去除水中的Fe ³⁺，吸附率为98.68%；TP-QG-Fe的干凝胶也可以从水中去除 F ^-；去除率约为87.92%。这项工作为通过主客体组装构建多功能智能材料提供了一种可行的方法。