*2.7. Thermal Analysis*

Simultaneous thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) measurements were performed using a Mettler Toledo TGA/DSC1 thermal analyzer (Mettler Toledo, Columbus, OH, USA). Samples (3–5 mg) were placed into sealed aluminium pans and heated in a stream of nitrogen (100 mL min<sup>−</sup>1) from 25 to 400 ◦C at a heating rate of 10 ◦C min<sup>−</sup>1.
