Liao Lieqiang, Zhong Xiang, Jia Xinjian, Liao Caiyun, Zhong Jinlian, Ding Shunmin, Chen Chao, Hong Sanguo, Luo Xuzhong
Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry, Nanchang University Nanchang 330031 P. R. China
Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, College of Chemistry and Chemical Engineering, Gannan Normal University Ganzhou 341000 P. R. China
RSC Adv. 2020 Aug 6;10(49):29129-29138. doi: 10.1039/d0ra05072e. eCollection 2020 Aug 5.
Supramolecular organogels are soft materials comprised of low-molecular-mass organic gelators (LMOGs) and organic liquids. Owning to their unique supramolecular structures and potential applications, LMOGs have attracted wide attention from chemists and biochemists. A new "superorganogel" system based on dicarboxylic acids and primary alkyl amines (R-NH) from the formation of organogels is achieved in various organic media including strong and weak polar solvents. The gelation properties of these gelators strongly rely on the molecular structure. Their aggregation morphology in the as-obtained organogels can be controlled by the solvent polarity and the tail chain length of R-NH. Interestingly, flower-like self-assemblies can be obtained in organic solvents with medium polarity, such as tetrahydrofuran, pyridine and dichloromethane, when the gelators possess a suitable length of carbon chain. Moreover, further analyses of Fourier transformation infrared spectroscopy and H nuclear magnetic resonance spectroscopy reveal that the intermolecular acid-base interaction and van der Waals interaction are critical driving forces in the process of organogelation. In addition, this kind of organogel system displays excellent mechanical properties and thermo-reversibility, and its forming mechanism is also proposed.
超分子有机凝胶是由低分子量有机凝胶剂（LMOG）和有机液体组成的软材料。由于其独特的超分子结构和潜在应用，LMOG引起了化学家和生物化学家的广泛关注。基于二元羧酸和伯烷基胺（R-NH）形成有机凝胶的新型“超级有机凝胶”体系可在包括强极性和弱极性溶剂在内的各种有机介质中实现。这些凝胶剂的凝胶化性质强烈依赖于分子结构。它们在所制备的有机凝胶中的聚集形态可通过溶剂极性和R-NH的尾链长度来控制。有趣的是，当凝胶剂具有合适的碳链长度时，在中等极性的有机溶剂（如四氢呋喃、吡啶和二氯甲烷）中可获得花状自组装体。此外，傅里叶变换红外光谱和氢核磁共振光谱的进一步分析表明，分子间酸碱相互作用和范德华相互作用是有机凝胶化过程中的关键驱动力。此外，这种有机凝胶体系表现出优异的机械性能和热可逆性，并且还提出了其形成机制。
