Chem. Commun., 2026, Accepted Manuscript DOI: 10.1039/D6CC03255A, Communication Zixuan Zhang, Jianxin Huang, Yanxi Zhou, Qing Chen, Rongchang Luo Two cobalt-porphyrin porous hyper-crosslinked polymers, functionalized with halogen-free imidazole or halogenated imidazolium groups, were engineered with cooperative dual active sites. Both materials effectively catalyze the cycloaddition of CO₂ to epoxides...