Lin Qi, Zhu Xin, Fu Yong-Peng, Zhang You-Ming, Fang Ran, Yang Li-Zi, Wei Tai-Bao
Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, P. R. China.
Soft Matter. 2014 Aug 21;10(31):5715-23. doi: 10.1039/c4sm00841c. Epub 2014 Jul 2.
Through the rational introduction of the multi self-assembly driving forces and F(-) sensing sites into a gelator molecule, low-molecular-weight organogelators L1 and L2 were designed and synthesized. L1 and L2 showed excellent gelation ability in DMF and DMSO. They could form stable organogels (OGL1 and OGL2) in DMF and DMSO with very low critical gelation concentrations. OGL1 and OGL2 could act as anion-responsive organogels (AROGs). Unlike most of the reported AROGs showing gel-sol phase transition according to the anions' stimulation, OGL1 could colorimetrically sense F(-) under gel-gel states. Upon addition of F(-), OGL1 showed dramatic color changes, while the color could be recovered by adding H(+). Moreover, OGL1 showed specific selectivity for F(-), other common anions and cations could not lead to any similar response. What deserves to be mentioned is that the report on specific sensing of anions under gel-gel states is very scarce. The gel-gel state recognition can endow the organogel OGL1 with the merits of facile and efficient properties for rapid detection of F(-). Therefore, OGL1 could act as a F(-) responsive smart material.
通过将多种自组装驱动力和氟离子传感位点合理引入到一种凝胶因子分子中，设计并合成了低分子量有机凝胶因子L1和L2。L1和L2在N,N-二甲基甲酰胺（DMF）和二甲基亚砜（DMSO）中表现出优异的凝胶化能力。它们能够在DMF和DMSO中以极低的临界凝胶化浓度形成稳定的有机凝胶（OGL1和OGL2）。OGL1和OGL2可以作为阴离子响应性有机凝胶（AROGs）。与大多数报道的根据阴离子刺激显示凝胶-溶胶相转变的AROGs不同，OGL1能够在凝胶-凝胶状态下通过比色法传感氟离子。加入氟离子后，OGL1显示出显著的颜色变化，而通过加入氢离子颜色可以恢复。此外，OGL1对氟离子表现出特异性选择性，其他常见阴离子和阳离子不会导致任何类似的响应。值得一提的是，关于在凝胶-凝胶状态下对阴离子进行特异性传感的报道非常稀少。凝胶-凝胶状态识别可以赋予有机凝胶OGL1简便高效的特性，用于快速检测氟离子。因此，OGL1可以作为一种氟离子响应性智能材料。
