A Water and Thermally Stable Metal-Organic Framework Featuring Selective CO2 Adsorption

A 2-fold interpenetrated microporous MOF [Ni-2(C2O4)(L)(2)](n)center dot 6nH(2)O (HL = 4,2':4 '',2'-terpyridine-4'-carboxylic acid) (1) was synthesized and structurally characterized. 1 has obvious ID channels along the crystallographic a and c axes with a pore size of 5.7 to 6.9 angstrom. Topological analysis shows that the framework of 1 can be interpreted as a (3,4)-connected net with point symbol (6(3))(6(5)center dot 8). 1 exhibits high water and thermal stability, which is demonstrated by TGA, PXRD, and VT-PXRD. Additionally, the high temperature structure of 1' (433 K) undoubtedly demonstrates the stability of the framework. More importantly, 1 shows high selectivities for CO2 over N-2, H-2, and CH4 at low pressure and 273 K.