Fig. 1. (a) Synthetic schemes of the triaminoguanidinium-based ionic porous organic framework (POF2) and ZnO-loaded framework (Zn/POF2, the crystallite/particle size of ZnO is not to scale as per the pore sizes of the frameworks in the pictorial depiction). (b) The Fourier transform infrared (FTIR) spectra of POF2 and Zn/POF2. (c) The thermogravimetric analysis (TGA) of POF2 (green) and Zn/POF2 (blue) demonstrating the high loading of ZnO in Zn/POF2. (d) The comparative analysis of the powder X-ray diffraction pattern of POF2, Zn/POF2, and ZnO illustrating the loading of ZnO in Zn/POF2. (e) The crystal structure and packing of the model compound based on triaminoguanidinium chloride and benzaldehyde (MTAG) depicting Cl⁻ ions sandwiched between the layers. (f) The PXRD analysis of POF2: simulated PXRD pattern (pink), experimental PXRD pattern (red), observed peaks (green) and the eclipsed structure model of POF2 (top view); grey: carbon, blue: nitrogen, green: chlorine. The FESEM and TEM (inset) images of (g) POF2 and (h) Zn/POF2, respectively. (i) The C1s XPS analysis of Zn/POF2. (j) The nitrogen sorption isotherms of POF2 (green) and Zn/POF2 (blue) measured at 77 K; solid circles represent adsorption, and open circles represent desorption. (k) The pore size distribution estimated by the non-local density functional theory (NLDFT) method depicting hierarchical porosity in POF2 and Zn/POF2.