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34 Chapter 3
After activating the Ru-MOFs, thermal gravimetric analysis (TGA) was performed
demonstrating stability of the samples 1-4 up to 200 °C. Interestingly, Ru-MOF 4 is the
most stable among the samples of discussed series and can be heated up to 250 °C without
decomposition (Figure 3.5). Both as-synthesized and activated phases of the sample 1
showed weight loss around 100 °C, which can be attributed to either a) loss of the residual
coordinated solvent within the framework or b) adsorbed molecules such as water during
transfer of the activated sample from the glovebox to the instrument. Ru-MOF 2 shows a
slow weight decrease at low temperature range (30-150 °C), which is similar to the
sample 1. Noteworthy, no similar observation was found in the curves of 3 and 4, meaning
there are less residual solvent molecules trapped as compared to the other two samples
1 and 2. Thus, it suggests that the pores of the frameworks 3 and 4 are more accessible
and activation (desorption of the guest molecules) is facilitated.
Figure 3.5. TG curves of the activated Ru-MOFs 1-4.