A Polyhedron-based Metal-Organic Framework showing high CO2 Adsorption Capacity

A novel porous copper-based metal-organic framework {[Cu-2(TTDA)(2)]*(DMA)(7)}(n) (1) (DMA = N,N-dimethylacetamide) was designed and synthesized via the combination of a dual-functional organic linker 5-(4-(4H-1,2,4-triazol-4-yl)phenyl)-[1,1:3,1-terphenyl]-4,4-dicarboxylic acid (H(2)TTDA) and a dinuclear Cu-II paddle-wheel cluster. This MOF is characterized by elemental analysis, powder X-ray diffraction (PXRD), thermo gravimetric analysis (TGA), and single-crystal X-ray diffraction. The framework is constructed from two types of cages (octahedral and cuboctahedral cages) and exhibits two types of circular-shaped channels of approximate size of 5.8 and 11.4 angstrom along the crystallographic c axis. The gas sorption experiments indicate that it possesses a large surface area (1687 m(2)g(-1)) and high CO2 adsorption capacities around room temperature (up to 172 cm(3)g(-1) at 273 K and 124 cm(3)g(-1) at 298 K).