Fig. 4. The crystal structures of CO₂ and SO₂-loaded MFM-305-CH₃ and MFM-305 studied by powder diffraction at 298 K. (a) Interactions of CO₂ molecule with the methyl, chloride ions and the –CH on pyridyl groups in MFM-305-CH₃. (b) Interactions of CO₂ molecule with the N- and C–H groups of pyridyl centre and the hydroxyl group in MFM-305. (c) Interactions of SO₂ molecule with the methyl, chloride ions and the –CH on pyridyl groups in MFM-305-CH₃. (d) Interactions of SO₂ molecule with the N– and –CH centres of pyridyl and the hydroxyl group in MFM-305. Carbon, black; hydrogen, olive; oxygen, red; interactions between CO₂ and frameworks C–H are shown in olive dashed line; interactions between adsorbed CO₂ molecules and hydroxyl are shown in orange dashed line; interactions between adsorbed CO₂ molecules and chloride ions are shown in yellow dashed line; interactions between adsorbed CO₂ molecules and N atoms are shown in light green dashed line.