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.

这项工作使用原位振动光谱技术探讨了氮与宿主之间的相互作用，因为本征微孔聚合物（PIM-1）的孔结构，孔径和表面化学性质都发生了变化。N ₂对PIM-1的吸附使N ₂红外荧光素具有活性，建立了弱的偶极-偶极相互作用。对于PIM-1，室温下N ₂振动模式的扰动要比其他多孔碳材料强得多，这暗示了PIM-1的CN表面基团在振动光谱上的偏移程度大，并暗示了强烈的π-π堆积气体表面相互作用。N ₂无扰动在无孔的CN类似物（四氟对苯二腈）中或在PIM-1的CN基团转化为酰胺后，可以观察到质谱图。通过紫外线照射，PIM-1的孔径减小，导致拉曼活性N ₂扰动的位移增加。