Supramolecular gel systems provide an ideal platform for the study of conjugated polydiacetylene (PDA) in soft materials. Compared with the well studied amphiphiles, the bolaamphiphilic molecules received much less attention in the fabrication of supramolecular gels. It's a big challenge to develop bolaamphiphilic type cogelators with reasonable molecular structures for the preparation of PDA supramolecular gels. Herein, a novel bolaamphiphilic cogelator containing an imidazole group at both ends was designed and coassembled with commercially available diacetylene acid monomer at 1:2 molar ratio by multiple non‐covalent interactions. A white supramolecular gel was successfully prepared through the conventional heating‐cooling method and systematically characterized by ¹H‐NMR, FT‐IR, XRD, SEM and rheology test. After UV irradiation, blue PDA was polymerized in the supramolecular gel system, as verified by UV‐Vis absorption and Raman spectroscopy. When heated to 55°C and 75°C, a successive blue‐to‐purple‐to‐red colorimetric transition was observed for the PDA supramolecular gel. Interestingly, after cooled to room temperature, the purple PDA could return to the original blue phase reversibly, while the red PDA remained in the red phase with an obvious fluorescence enhancement effect. This work would promote the investigation of bolaamphiphilic molecules as well as conjugated PDA in soft materials.

中文翻译：

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基于聚二乙炔（PDA）的超分子凝胶与疏液性凝胶剂共组装

超分子凝胶系统为研究软质材料中的共轭聚二乙炔（PDA）提供了理想的平台。与经过充分研究的两亲物相比，该两亲分子在超分子凝胶的制备中受到的关注要少得多。开发具有合理分子结构的PDA两分子凝胶的保兰两亲型胶凝剂是一个巨大的挑战。在本文中，设计了一种新型的在两末端都带有咪唑基的两亲性凝胶剂，并通过多种非共价相互作用将其与市售的乙炔酸单体以1：2的摩尔比共组装。通过常规加热-冷却方法成功制备了白色超分子凝胶，并系统表征为¹H-NMR，FT-IR，XRD，SEM和流变性测试。紫外线照射后，蓝色PDA在超分子凝胶体系中聚合，这已通过紫外线可见吸收和拉曼光谱证实。加热至55°C和75°C时，观察到PDA超分子凝胶发生了连续的蓝色到紫色到红色的比色转换。有趣的是，冷却至室温后，紫色PDA可以可逆地返回到原始的蓝相，而红色PDA保持在红相中，具有明显的荧光增强作用。这项工作将促进研究软质材料中的亲两性分子以及共轭PDA。