Abstract:

Compared with polymer gels, small organic molecule-based gels possess easy modification, have better stimuli response, and show great application potential in many fields. In this work, gallic acid and mono-carboxy tetraphenylene were used as the starting materials to synthesize a gelator G1 with both aggregation-induced emission property and reduction responsiveness. The gelator G1 can self-assemble into gels in cyclohexane and dimethyl sulfoxide (DMSO), and the critical gelation concentrations were 5.6mg/mL and 16.7mg/mL, respectively. The results of UV-vis spectroscopy, fluorescence spectroscopy, infrared spectroscopy, temperature-dependent NMR study and XRD study indicated that π-π stacking and hydrogen bonding were the main driving forces for the formation of the gel. In addition, the results of the contact angle study indicated that the contact angle of the xerogel films derived from the DMSO gels was as high as 137°, suggesting strong hydrophobicity of the xerogel films, which can be potentially applied in the field of stimuli-responsive fluorescent hydrophobic materials.

Key words: organogel, aggregation-induced emission, reduction responsiveness, hydrophobic material

摘要：

与聚合物凝胶相比，有机小分子凝胶易于化学改性，具有更好的刺激响应，在众多领域显示出巨大的应用潜力。本文以没食子酸、单羧基四苯乙烯为基本原料，合成得到一种兼具聚集诱导发光性质和还原刺激响应性凝胶因子G1。凝胶因子G1能在环己烷和二甲基亚砜（DMSO）中自组装形成凝胶，临界成胶浓度分别为5.6mg/mL和16.7mg/mL。紫外光谱、荧光光谱、红外光谱、变温核磁、X射线衍射（XRD）研究结果表明，π-π堆积和氢键作用是凝胶因子G1 形成凝胶的主要驱动力。此外，接触角研究结果表明，凝胶因子G1在DMSO中形成的干凝胶薄膜的接触角高达137°，表明其具有较强的疏水性，在刺激响应性荧光疏水材料领域有着潜在的应用价值。

关键词: 有机凝胶, 聚集诱导发光, 还原响应性, 疏水材料