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 (H3LMe), [Mn-3(LMe)(2)(DMF)(4)(H2O)]center dot 1.5DMF center dot 3.5H(2)O (1) and [Cd-3(LMe)(2)(DMF)][Cd-3(LMe)(2)(DMF)(2)(H2O)]center dot 5DMF center dot 3.5H(2)O (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.