College of Chemical Engineering, Northwest Minzu University (Northwest University for Nationalities), Lanzhou 730070, China.
Soft Matter. 2019 Jan 30;15(5):999-1004. doi: 10.1039/c8sm02319k.
A series of stable super metal hydrogels (TP-Ms, M = Tb3+, Eu3+, La3+ and Ce3+) with a low critical gelation concentration (2.28 × 10-3 M, 0.1%) was successfully constructed by forming hierarchical assemblies of a tripodal gelator (TP) with rare earth metal ions (Tb3+, Eu3+, La3+ and Ce3+). Interestingly, the super metal hydrogels TP-Eu and TP-La show a specific and ultrasensitive response to histidine (His). The addition of a series of amino acids into the metal hydrogels TP-Eu and TP-La showed that only His could induce distinct fluorescent enhancement for TP-Eu and TP-La, while other amino acids did not significantly interfere with the His sensing process. The LODs of super metal-hydrogel TP-Eu and TP-La for His are (1.83-1.94) × 10-9 and (1.83-1.85) × 10-9 M, respectively. In addition, constructing super supramolecular metal hydrogels by hierarchical assemblies of an easily synthesized tripodal gelator and rare earth metal ions is a novel and efficient approach to the design and development of multi-functional super supramolecular metal hydrogel-based materials.
一系列具有低临界凝胶浓度（2.28×10-3 M，0.1%）的稳定超金属水凝胶（TP-Ms，M=Tb3+、Eu3+、La3+和 Ce3+）通过形成具有稀土金属离子（Tb3+、Eu3+、La3+和 Ce3+）的三足凝胶剂（TP）的分级组装成功构建。有趣的是，超金属水凝胶 TP-Eu 和 TP-La 对组氨酸（His）表现出特异性和超灵敏响应。将一系列氨基酸加入到金属水凝胶 TP-Eu 和 TP-La 中表明，只有 His 可以诱导 TP-Eu 和 TP-La 明显的荧光增强，而其他氨基酸对 His 传感过程没有明显干扰。超金属水凝胶 TP-Eu 和 TP-La 对 His 的 LOD 值分别为（1.83-1.94）×10-9 和（1.83-1.85）×10-9 M。此外，通过易于合成的三足凝胶剂和稀土金属离子的分级组装构建超超分子金属水凝胶是设计和开发多功能超超分子金属水凝胶基材料的一种新颖而有效的方法。
