Reversible Phase Transition of Robust Luminescent Hybrid Hydrogels
Reversible Phase Transition of Robust Luminescent Hybrid Hydrogels
复制标题
鲁棒发光混合水凝胶的可逆相变
DOI：
10.1002/anie.201712670
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发表时间：
2018-02-19
影响因子：
16.6
通讯作者：
Li, Huanrong
中科院分区：
文献类型：
--
作者：
Li, Zhiqiang;Wang, Guannan;Li, Huanrong
我们在此报告了通过合理选择和结合光开关来远程控制鲁棒发光混合水凝胶的可逆相变。用胍基团官能化的偶氮苯单元被用作光开关，并通过涉及用2,6-吡啶二甲酸（PDA）基团官能化的β-环糊精的主客体包合方法掺入。虽然胍基官能团与带负电的锂皂石基质表面结合以连接有机和无机成分，但 PDA 基团能够同时与不同的镧系金属离子配位，从而使水凝胶广泛发光。由于其与环糊精的构象依赖性结合行为，偶氮苯的异构化诱导包合物的缔合或解离，从而导致发光杂化水凝胶的可逆光控溶胶凝胶相变。
We report herein on remote control over a reversible phase transition of robust luminescent hybrid hydrogels as enabled by the rational selection and incorporation of photoswitches. Azobenzene units functionalized with a guanidinium group were utilized as the photoswitches and incorporated through a host-guest inclusion method involving -cyclodextrins functionalized with 2,6-pyridinedicarboxylic acid (PDA) groups. While the guanidinium functional groups bind to the negatively charged Laponite matrix surface to connect organic and inorganic components, the PDA groups enable simultaneous coordination with different lanthanide metal ions, thus rendering the hydrogel broadly luminescent. Owing to its conformation-dependent binding behavior with -cyclodextrin, the isomerization of azobenzene induced association or dissociation of the inclusion complexes and thus lead to a reversible photocontrolled solgel phase transition of the luminescent hybrid hydrogels.