UV and Chemical Modifications of Polymer of Intrinsic Microporosity 1 to Develop Vibrational Spectroscopic Probes of Surface Chemistry and Porosity
This work probes host-guest interactions of nitrogen using in-situ vibrational spectroscopy, as the pore structure, pore size, and surface chemistry of a Polymer of Intrinsic Microporosity (PIM-1) are varied. N2 adsorption to PIM-1 renders the N2 infrared vibron active, establishing a weak dipole-dipole interaction. The perturbation of the N2 vibrational mode at room temperature is much stronger for PIM-1 than other porous carbon materials, implicating the C-N surface group of PIM-1 in the degree of shift in the vibrational spectra and suggesting a strong π-π stacking gas-surface interaction. No perturbation of the N2 spectra is observed for a non-porous C-N analogue (tetrafluoro-terepthalonitrile) or after conversion of the C-N group of PIM-1 to an amide. The pore size of PIM-1 is reduced via UV irradiation, leading to an increase in the shift of the Raman-active N2 perturbation.
P. Ray et al., "UV and Chemical Modifications of Polymer of Intrinsic Microporosity 1 to Develop Vibrational Spectroscopic Probes of Surface Chemistry and Porosity," Microporous and Mesoporous Materials, vol. 277, pp. 29-35, Elsevier B.V., Mar 2019.
The definitive version is available at https://doi.org/10.1016/j.micromeso.2018.09.013
Chemical and Biochemical Engineering
Keywords and Phrases
Adsorption; Nitrogen; Porous polymers; Spectroscopy
International Standard Serial Number (ISSN)
Article - Journal
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