Interpenetrated Metal-Organic Framework with Selective Gas Adsorption and Luminescent Properties

A new 2-fold interpenetrated cadmium metal organic framework {[Cd-2(TPPBDA)(OBA)(2)]center dot 4DMA center dot 8H(2)O}(n) (1) (Cd-MOF) (TPPBDA = N,N,N',N'-tetrakis(4-(4-pyridine)-phenyl)biphenyl-4,4'-diamine, H(2)OBA = 4,4'-oxybis(benzoate), and DMA = N,N-dimethylacetamide) was synthesized by a solvothermal reaction. Compound 1 is a 3D net with a meso-helical chain. A noticeable structural feature is that the arrangement of lattice DMA molecules is different in the different meso-helical channels. The material exhibits gas sorption properties for CO2, H-2, and CH4. The adsorption selectivity of CO2/CH4 was calculated from the single-component isotherms using the dual-site Langmuir-Freundlich-based ideal adsorbed solution theory. In addition, the luminescent properties of the Cd-MOF in the solid state and in suspension in different organic solvents was investigated.