College of Science and Hebei Research Center of Pharmaceutical and Chemical Engineering, Hebei University of Science and Technology, Yuhua Road 70, Shijiazhuang 050080, PR China.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, PR China.
J Colloid Interface Sci. 2018 Jul 1;521:190-196. doi: 10.1016/j.jcis.2018.03.051. Epub 2018 Mar 15.
Driven by tunable metal-ligand interactions, a polydentate ligand TC containing terpyridine and carboxylic acid units was developed to construct metallo-polymers that showed multiple aggregation modes with controlled macroscopic properties. In the presence of different kind of Zn ions or NaOH, TC could form metallo-polymers via π-π stacking and metal-ligand interaction that further trapped water molecules, resulting in hydrogels and crystals. Moreover, these TC/Zn hydrogels could transform to soluble and fluorescent aggregates in the presence of NaOH due to the formation of binuclear metallo-polymers with enhanced ICT emission. The metal-ligand interactions tuned by different metal salts in gels, crystals, and sols were also studied and illustrated in detail, it was also proved that water was an essential linker for constructing Na-based metallo-polymers from the TC/NaOH crystal data. This work demonstrated the engineered coordination pathways in generating controllable hydrogels and metallo-polymers for the first time, which led to novel approach for facilely constructing a number of hydrogels with tailorable macroscopic properties.
受可调金属-配体相互作用的驱动，开发了一种多齿配体 TC，它含有三吡啶和羧酸单元，用于构建具有可控宏观性质的金属聚合物。在不同种类的 Zn 离子或 NaOH 的存在下，TC 可以通过 π-π 堆积和金属-配体相互作用形成金属聚合物，进一步捕获水分子，从而形成水凝胶和晶体。此外，由于形成具有增强 ICT 发射的双核金属聚合物，这些 TC/Zn 水凝胶在存在 NaOH 时会转变成可溶性和荧光聚集体。还研究并详细说明了凝胶、晶体和溶胶中不同金属盐调变的金属-配体相互作用，还从 TC/NaOH 晶体数据证明水是构建基于 Na 的金属聚合物的必要连接体。这项工作首次展示了通过工程化配位途径生成可控水凝胶和金属聚合物，为轻松构建具有可定制宏观性质的大量水凝胶提供了新方法。
