Five MOFs with different topologies based on anthracene functionalized tetracarboxylic acid: syntheses, structures, and properties†
Abstract
Five coordination polymers based on 5,5′-(2,3,6,7-tetramethoxyanthracene-9,10-diyl)diisophthalic acid (H4LOMe): [Mn4(LOMe)(OAc)2(μ3-OH)2(NMP)4(H2O)2]·2H2O (1), [Ni2(LOMe)0.5(H2LOMe)0.5(μ3-OH)(H2O)3]·6H2O (2), [Cd2(LOMe)(H2O)2(NMP)]·2DMF·NMP·H2O (3), [Co2(LOMe)(H2O)2]·2NMP·DMA·2H2O (4), [Zn2(LOMe)(H2O)2]·2NMP·2H2O·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 π⋯π stacking interaction; complex 2 displays a 3D framework with fsc topology based on 2D 44-sql layers and tetranuclear SBUs; complex 3 reveals a 3D PtS network via the LOMe 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.