Abstract
Metal-organic frameworks (MOFs) have emerged as promising materials for use in practical applications of renewable energy, water harvesting, and catalytic transformation. Here we report the design of a highly porous MOF, termed MOF-907. Single crystal X-ray diffraction analysis, in combination with topological deconstruction, revealed a MOF based on trigonal prismatic secondary building units linked together by triangular and linear units to form a previously unseen net (nha) with minimal transitivity, which is rational for these constituent building units. The catalytic properties of MOF-907 for the microwave-assisted radical polymerization of methyl methacrylate were demonstrated. MOF-907 produced a poly methyl methacrylate product in a short reaction time (30 min) with high yield (98%), high molecular weight (20,680 g mol−1), and low polydispersity (1.23).
Highlights
Metal-organic frameworks (MOFs) have emerged as promising materials for use in practical applications of renewable energy, water harvesting, and catalytic transformation
Single crystal X-ray diffraction analysis revealed that MOF-907 crystallized in the body-centered cubic space group, Im-3m (No 229), with a lattice parameter of a = 44.4781(14) Å (Supplementary Data 1 and Supplementary Table 1)
These primary cages assemble into the second level of the structure, in which each trigonal prismatic vertex of the primary octahedral cage is shared with another primary octahedral cage (Fig. 2a)
Summary
Metal-organic frameworks (MOFs) have emerged as promising materials for use in practical applications of renewable energy, water harvesting, and catalytic transformation. MOF-907 produced a poly methyl methacrylate product in a short reaction time (30 min) with high yield (98%), high molecular weight (20,680 g mol−1), and low polydispersity (1.23) It is a central premise of reticular chemistry that structures of the highest symmetry (i.e., minimal transitivity) are the most likely to result from linking simple, symmetric building units[1,2,3,4]. For the first two questions, we know that complex MOFs constructed from multiple building units rarely follow the minimal transitivity principle (MOF-205 is a notable exception) In this contribution, we describe a complex ternary MOF system, termed MOF-907, which is constructed from trigonal prismatic Fe3O(–CO2)[6] clusters with triangular 4,4′,4”-benzene1,3,5-triyl-tris(benzoic acid) (H3BTB) and linear 2,6-naphthalenedicarboxylic acid (H2NDC) linkers. In addressing the third question, we elucidate the relationship between high symmetry and the favorable geometry of the pore structure within such systems, leading to this material′s enhanced catalytic properties
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