A Doubly Interpenetrated Co(II) Framework: Synthesis, Crystal Structure and Selective Adsorption of CO2

A novel, porous and doubly interpenetrated MOF (FJU-29) was synthesized and characterized by FT-IR, TGA and X-ray single-crystal/powder diffraction. FJU-29 crystallizes in monoclinic, space group C2/c with a = 22.2890(7), b = 10.9175(2), c = 21.5601(7) angstrom, beta = 112.908(4)degrees, V = 4832.7(3) angstrom(3), Z = 8, M-r = 450.26, D-c = 1.238 g/cm(3), F(000) = 1832, mu(CuKa) = 5.885 mm(-1), R = 0.0585 and wR = 0.1544 for 4789 observed reflections (I > 2 sigma(I)), and R = 0.0726 and wR = 0.1627 for all data. FJU-29 possesses paddle-wheel {Co-2(COO)(4)} clusters bridged by bi-pyrazolate naphthalene diimide ligands (H2NDI) and H2BDC to from a 3D framework with a pcu-topology. The desolvated FJU-29a shows the BET surface area of 560.44 m(2).g(-1) accompanies with discriminating uptakes in CO2 and N-2. The adsorption selectivity determined by ideal adsorbed solution theory (IAST) indicated that FJU-29a has high CO2/N-2 (18/85) selectivity (75.5) at 296 K and 100 kPa. The relatively high selectivity further implies that FJU-29a is a potential material for practical flue gas purification.