Stepwise Assembly of a Multicomponent Heterometallic Metal-Organic Framework via Th-6-Based Metalloligands

Herein we present a new metalloligand, Th6L12 [IHEP-10; L = 4-pyrazolecarboxylic acid (H2PyC)], which can be used to generate a novel multicomponent heterometallic metal-organic framework (MOF), [[Cu-3(mu(3)-OH)(NO3)(H2O)(2)](2)Th-6(mu O-3)(4)(mu(3)-OH)(4)(PyC)(6)(HPyC)(6)(H2O)(6)](NO3)(2) (IHEP-11), through further assembly with second [Cu3(mu 3-OH)(PyC)3] clusters. In IHEP-11, six Cu-3 clusters are connected by six NO3- anions to form an unprecedented annular Cu-18 cluster, which can be viewed as a 12-connected node to link with 12 Th-6 clusters, resulting a 4,12-connected shp net. Benefiting from the cationic framework and 3D porous structure, IHEP-11 can efficiently remove ReO4- (an analogue of radioactive (TcO4-)-Tc-99) from aqueous solution in a wide pH range. This work highlights the feasibility of constructing multicomponent MOFs through a step-by-step synthesis strategy based on metalloligands