Five MOFs with different topologies based on anthracene functionalized tetracarboxylic acid: syntheses, structures, and properties

Five coordination polymers based on 5,5'-(2,3,6,7-tetramethoxyanthracene-9,10-diyl) diisophthalic acid (H4LOMe): [Mn-4(L-OMe)(OAc)(2)(mu(3)-OH)(2)(NMP)(4)(H2O)(2)]center dot 2H(2)O (1), [Ni-2(L-OMe)(0.5)(H2LOMe)(0.5)(mu(3)-OH)(H2O)(3)]center dot 6H(2)O (2), [Cd-2(L-OMe)(H2O)(2)(NMP)]center dot 2DMF center dot NMP center dot H2O (3), [Co-2(L-OMe)(H2O)(2)]center dot 2NMP center dot DMA center dot 2H(2)O (4), [Zn-2(L-OMe)(H2O)(2)]center dot 2NMP center dot 2H(2)O center dot DOE (5) (NMP = N-methylpyrrolidone, DMF = N, N'-dimethylformamide, DMA = N, N'-dimethylacetamide, DOE = 1,4-dioxane) were prepared by solvothermal methods and characterized by elemental analysis (EA), single-crystal X-ray crystallography, powder X-ray diffraction (PXRD), infrared spectroscopy (IR), and thermogravimetric analyses (TGA). X-ray crystallography analysis shows that complex 1 bears a two-dimensional (2D) (4,4) network based on tetranuclear secondary building units, which are further assembled into a three-dimensional supramolecular structure via pi center dot center dot center dot pi stacking interaction; complex 2 displays a 3D framework with fsc topology based on 2D 4(4)-sql layers and tetranuclear SBUs; complex 3 reveals a 3D PtS network via the L-OMe bridging dimetal {Cd2O11} units; complexes 4 and 5 possess 3D open frameworks with a rarely reported 3-nodal (4,4,4)-connected nou network. Moreover, magnetic susceptibility measurement of complexes 1 and 2 confirm the presence of magnetic exchange coupling among the metal ions of tetranuclear clusters, and fluorescent spectra of complexes 1, 3 and 5 show emission signals in the blue region.