Syntheses, Crystal Structures, and Properties of Two 2‑Fold Interpenetrating Metal–Organic Frameworks Based on a Trigonal Rigid Ligand
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Two 2-fold interpenetrating metal–organic frameworks based on 1,3,5-tris[2-(4-carboxyphenyl)-1-ethynyl]-2,4,6-trimethylbenzene (H3LMe), [Mn3(LMe)2(DMF)4(H2O)]·1.5DMF·3.5H2O (1) and [Cd3(LMe)2(DMF)][Cd3(LMe)2(DMF)2(H2O)]·5DMF·3.5H2O (2), have been synthesized by using rigid trigonal H3LMe and nitrate under solvothermal conditions. Complex 1 displays a three-dimensional open framework with rare (3,6)-connected 2-nodal sit topology, whereas complex 2 features a new (3,3,6)-connected topology. Both 1 and 2 are blue fluorescent, and the magnetic measurement of 1 indicates that metal centers within the trinuclear cluster exhibit antiferromagnetic coupling interactions. Significantly, although complexes 1 and 2 have similar total solvent-accessible volumes, 2 demonstrates a higher Brunauer–Emmett–Teller surface area than that of 1, further indicating the influence of pore structure on gas absorption.
