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Keywords:

  • acetylene;
  • adsorption;
  • copper;
  • microporous materials;
  • zinc

Abstract

The acetylene-sorption properties of six porous coordination polymers (PCPs), [M2(L)2(dabco)]n (dabco=1,4-diazabicyclo[2.2.2]octane, M=Cu2+ (1), Zn2+ (2), L=1,4-benzenedicarboxylate (bdc; 1 a, 2 a), 1,4-naphthalenedicarboxylate (ndc; 1 b, 2 b), 9,10-anthracenedicarboxylate (adc; 1 c, 2 c)), were investigated. The acetylene sorption isotherms of 1 and 2 measured at 195 K are of type I and show a steep increase at low relative pressures. The sorption properties of carbon dioxide at 195 K were also investigated. Compounds 1 and 2 showed a large difference in onset pressure between acetylene sorption isotherms, although the difference between the carbon dioxide sorption isotherms is not so significant. In particular, 2 c displayed a remarkable affinity for acetylene. The acetylene sorption isotherm at 298 K showed that the adsorption amounts for 2 c and 2 b at 298 K, 1 atm (101 and 106 mL g−1, respectively) were higher than those of other conventional porous materials. Notably, of the compounds 1 and 2, the porous crystals 2 c had the highest affinity for acetylene.