*3.3. Thermal Analysis*

In order to characterize the thermal stability of **1** and **2**, their thermal behaviors were investigated by TGA (Figure 6). For **1**, a weight loss of 9.8% was witnessed in the temperature scale of 25–60 ◦C, which corresponds to the removal of guest molecules of water. The TG curve goes into a platoon within 160–270 ◦C, which implies that the framework stability of **1** is up to 270 ◦C. After that, a weight loss step occurrs until 800 ◦C, which corresponds to the decomposition of organic ligands. (Figure 6a). As for **2**, the first weight loss is 3.6% at 200 ◦C. Due to the absence of guest molecules according to the SCXRD analysis, the first weight loss was attributed to the elimination of water molecules adhering to the sample's surface. The second weight loss begins at 300 ◦C; after that, a sharp weight loss occurred, which corresponds to the decomposition of organic ligands. The TGA result of **2** implies that the framework stability of **2** is up to 300 ◦C (Figure 6b).

**Figure 6.** The TGA diagrams for **1** (**a**) and **2** (**b**).
