Th<sub>6</sub>-Based Multicomponent Heterometallic Metal–Organic Frameworks Featuring 6,12-Connected Topology for Iodine Adsorption
Zhiheng Zhou, Xingjun Li, Zhi‐wei Huang, Lei Mei, Fuqiu Ma, Jipan Yu, Qiang Zhang, Zhifang Chai, Kong‐Qiu Hu, Wei‐Qun Shi
Abstract
Its high coordination number and tendency to cluster make Th 4+ suitable for constructing metal–organic frameworks (MOFs) with novel topologies. In this work, two novel thorium-based heterometallic MOF isomers (IHEP-17 and IHEP-18) were assembled from a Th 6 cluster, a multifunctional organic ligand [4-(1 H -pyrazol-4-yl)benzoic acid (HPyba)], and Cu 2+ /Ni 2+ cations via the one-pot solvothermal synthesis strategy. The framework features a 6,12-connected new topology net and contains two kinds of supramolecular cage structures, Th 36 M 4 and Th 24 M 2, suitable for guest exchange. Both MOF materials can efficiently adsorb I 2 . X-ray photoelectron spectroscopy, Raman spectroscopy, and single-crystal X-ray diffraction indicate that the adsorbed iodine is uniformly distributed within the Th 36 M 4 cage but not the Th 24 M 2 cage in the form of I 3 – .