Hu Chaolei, Chen Damien W, Sudan Sylvain, Severin Kay
Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
Chem Sci. 2025 Feb 27;16(13):5559-5564. doi: 10.1039/d5sc00335k. eCollection 2025 Mar 26.
Soft polymer networks with palladium cages as crosslinks can be obtained by combining polymeric N-donor ligands with Pd salts in organic solvents. Herein, we describe an alternative procedure that enables the preparation of hydrogels with Pd L -type junctions. The gels were obtained by photoinitiated copolymerization of palladium cages with acrylamide monomers in water. Cages with varying nuclearities ( = 2, 4, or 12) and different acrylates were employed. The material properties could be tuned by changing the crosslinker density. Thermoresponsive hydrogels were obtained when NIPAm was used as the monomer. The dynamic nature of the Pd-based crosslinks allows the creation of stimuli-responsive hydrogels. In particular, we were able to alter the network topology of a hydrogel by anion-induced conversion of PdL crosslinks into PdL-type junctions.
通过在有机溶剂中将聚合物氮供体配体与钯盐相结合，可以得到以钯笼作为交联点的软聚合物网络。在此，我们描述了一种替代方法，该方法能够制备具有Pd L型连接点的水凝胶。这些凝胶是通过钯笼与丙烯酰胺单体在水中进行光引发共聚而得到的。使用了具有不同核数（n = 2、4或12）的笼以及不同的丙烯酸酯。通过改变交联剂密度可以调节材料性能。当使用NIPAm作为单体时，可得到热响应性水凝胶。基于钯的交联的动态性质使得能够创建刺激响应性水凝胶。特别地，我们能够通过阴离子诱导将PdL交联转变为PdL型连接点来改变水凝胶的网络拓扑结构。
