To investigate whether these morphological variations translate into distinct physico-chemical properties, thermogravimetry analysis (TGA) and nitrogen sorption isotherm measurements were performed on the two yellow powders. While the TGA thermograms of the nanoparticles align well with the previously reported COF-300, confirming the high structural stability (> 500 ºC) of the obtained nanoparticulated material (Figure ), the nanorods exhibit a relatively lower thermal stability. This is evident from the weight loss of 6.20% observed between 350 ºC and 500 ºC, which can be attributed to the presence of guest COF oligomers within the structure (Figure ). Moreover, nitrogen sorption isotherm measurements of the previously activated COF-300 nanoparticles confirm their porosity. The results were adjusted to the Brunauer-Emmet-Teller (BET) model, indicating a mesoporous material with a BET surface area of 684 ± 4 m 2 g -1 (Figure ). The isotherm also displayed a hysteresis loop, indicating a dynamic behavior of the material in response to variations in gas pressure. However, note that the nanorods exhibited a lower porosity (138 ± 1 m 2 g -1 ) which can be attributed to the different crystal structure, as confirmed with the synchrotron XRD measurements and PXRD analysis.