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Keywords:

  • cobalt;
  • fluorine;
  • hydrogen storage;
  • metal–organic frameworks;
  • microporous materials;
  • X-ray diffraction

Abstract

The synthesis, structure, and gas adsorption properties of three new metal–organic frameworks (MOFs) designed from isonicotinic acid (INA) and its fluorinated analogue 3-fluoroisonicotinic acid (FINA) along with CoII as the metal center have been reported. Co-INA-1 ([Co3(INA)4(O)(C2H5OH)3][NO3]C2H5OH3 H2O; INA=isonicotinic acid) and Co-INA-2 ([Co(INA)2]DMF) are structural isomers as are Co-FINA-1 ([Co3(FINA)4(O)(C2H5OH)2]H2O; FINA=3-fluoroisonicotinic acid) and Co-FINA-2 ([Co(FINA)2]H2O), but the most important thing to note here is that Co-INA-1 and Co-FINA-1 are isostructural as are Co-INA-2 and Co-FINA-2. The effect of partial introduction of fluorine atoms into the framework on the gas uptake properties of MOFs having similar structures has been analyzed experimentally and computationally in isostructural MOFs.