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. 2021 Jan 28;11(9):5192–5203. doi: 10.1039/d0ra09292d

Fig. 3. (a) Schematic shape of prefunctionalization (direct modification or in situ synthesis) method;27 (b) hydrogen bonding between CO2 molecule and –NH2 functional group;28 (c) dipolar ion (zwitterion) formation by the acidic CO2 and basic NH2 groups.29.

Fig. 3