Synthesis, characterization and selective hysteretic sorption property of metal-organic frameworks with 3,5-di(pyridine-4-yl) benzoate

Three new metal-organic frameworks (MOFs) {[Zn(L)(HCOO)(H2O)]center dot H2O)(n) (1), {Cd(L)(2)}(n) (2) and {Co(L)(BDC)(0.5)(H2O)}(n) (3) [HL = 3,5-di(pyridine-4-yl)benzoic acid, H2BDC = 1,4-benzenedicarboxylic acid] were synthesized by hydro/solvothermal reactions and characterized by elemental analysis, thermogravimetric analysis, IR spectroscopy, powder and single crystal X-ray diffraction. Complex 1 is a two-dimensional (2D) network with {6(3)} topology, which is further assembled into a three-dimensional (3D) supramolecular architecture through hydrogen bonding interactions. Complex 2 is a 2-fold interpenetrating 3D framework with a point (Schlafli) symbol of {6(3)}{6(7).8(3)}, while 3 is a 3D net formed by interpenetration of 2D bilayers (2D + 2D -> 3D) with a point (Schlafli) symbol of {6(3)}{6(6)}. Selective and hysteretic sorption of carbon dioxide (CO2) was found for 3 at 195 K, and the photoluminescence properties of 1 and 2 were investigated.