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A novel metal-organic framework[Co(BTTA)(H2O)2]n(FJI-H24)has been prepared from H2BTTA ligand and CoCl2,and its structure was determined by single-crystal X-ray diffraction,thermogravimetric analysis,and Fourier transform infrared spectroscopy.It has relatively narrow pores and high density of open metal ions and free Lewis base sites.Gas adsorption tests demonstrate that FJI-H24 has moderate CO2(34.0 cm3.g-1)and C2H2(53.0 cm3·g-1)adsorption capacity,but displays high selectivity of CO2/N2(87)and C2H2/CH4(66)under ambient conditions(298 K,1 atm),which may be attributed to its relatively narrow pores and polar environment.This work will provide a potential strategy for preparing practical porous metal-organic frameworks for gas adsorption and purification.