Facile Synthesis of Aromatic Porous Organic Polymer for Highly Selective Capture of CO2 via Enhanced Local Dipole-π and Dipole-Quadrupol Interactions by Adjacent Benzene
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A new aromatic porous organic polymeric material named as N-PKIN has been successfully constructed. The electron-rich benzene in its microstructure can donate the electron density to the neighboring indole and carbonyl groups to further enhance the local dipole-π and dipole-quadrupole binding abilities to the CO2 molecules for effectively facilitating the adsorbent to attract CO2 selectively. As a result, this porous organic polymer showed outstanding CO2 absorption capacity and high CO2/N2, CO2/CH4 selectivity. In addition, upon exposure to humid condition, the porous organic polymer still kept high CO2 capture capacity and selectivity. Moreover, we have demonstrated that the CO2 absorption process is fully reversible.
The details of synthesis and characterizations of 1,4-diindolebenzoyl, 1,3,5-tris-(4-fluorobenzoyl) benzene; the structural characterization, thermal stability, BET specific surface area plots, isosteric heat of CO2 adsorption and gas adsorption isotherms of N-PKIN; the adsorption measurements and simulation method are shown in the Electronic Supplementary Material (ESM).
This research was financially supported by the National Natural Science Foundation of China (nos. U1233202 and 51175434).
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