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Two Isostructural Flexible Porous Coordination Polymers Showing Contrasting Single-Component and Mixture Adsorption Properties for Propylene/Propane
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Citations
36
References
2020
Year
Solvothermal reactions of 3-(3-methylpyridin-4-yl)benzoic acid (Hmpba) with Mn(NO<sub>3</sub>)<sub>2</sub> or Co(NO<sub>3</sub>)<sub>2</sub> yielded isostructural porous coordination polymers, [Mn(mpba)<sub>2</sub>]·guest (MCF-56, <b>1·g</b>) and [Co(mpba)<sub>2</sub>]·guest (MCF-57, <b>2·g</b>), respectively. X-ray diffraction revealed that <b>1·g</b> and <b>2·g</b> possess similar one-dimensional ultramicroporous channels, and guest-free [Mn(mpba)<sub>2</sub>] (<b>1'</b>) and [Co(mpba)<sub>2</sub>] (<b>2'</b>) possess significantly and slightly contracted channels, respectively. Single-component C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> adsorption isotherms and computational simulations showed the typical nonporous-to-porous structural transformations for <b>1'</b>, in which C<sub>3</sub>H<sub>6</sub> exhibits a significantly lower threshold pressure, and the typical small-pore-to-large-pore structural transformations for <b>2'</b>, in which C<sub>3</sub>H<sub>6</sub> exhibits a slightly lower threshold pressure. Mixture column breakthrough experiments showed that the C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> separation performances of <b>2'</b> are obviously better than those of <b>1'</b>, because the latter cannot adsorb C<sub>3</sub>H<sub>6</sub> below the threshold pressure for pore opening, and the pore opened by C<sub>3</sub>H<sub>6</sub> can adsorb C<sub>3</sub>H<sub>8</sub>.
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