Syntheses, Crystal Structures, and Properties of Two 2‑Fold Interpenetrating Metal–Organic Frameworks Based on a Trigonal Rigid Ligand

Two 2-fold interpenetrating metal–organic frameworks based on 1,3,5-tris­[2-(4-carboxyphenyl)-1-ethynyl]-2,4,6-trimethylbenzene (H₃L^Me), [Mn₃(L^Me)₂­(DMF)₄­(H₂O)]­·1.5DMF­·3.5H₂O (<b>1</b>) and [Cd₃(L^Me)₂­(DMF)]­[Cd₃(L^Me)₂­(DMF)₂­(H₂O)]­·5DMF­·3.5H₂O (<b>2</b>), have been synthesized by using rigid trigonal H₃L^Me and nitrate under solvothermal conditions. Complex <b>1</b> displays a three-dimensional open framework with rare (3,6)-connected 2-nodal <i><b>sit</b></i> topology, whereas complex <b>2</b> features a new (3,3,6)-connected topology. Both <b>1</b> and <b>2</b> are blue fluorescent, and the magnetic measurement of <b>1</b> indicates that metal centers within the trinuclear cluster exhibit antiferromagnetic coupling interactions. Significantly, although complexes <b>1</b> and <b>2</b> have similar total solvent-accessible volumes, <b>2</b> demonstrates a higher Brunauer–Emmett–Teller surface area than that of <b>1</b>, further indicating the influence of pore structure on gas absorption