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40 Chapter 3
extent than acetic acid (Table 3.1). At the same time, application of solvent exchange to
Ru-MOF 4, containing the lowest amount of the guest molecules, does not have significant
effect. The integration of the signals due to acetate protons reveals the same values,
suggesting the amount of the acetate before and after exchanging is constant. Comparing
all 1-4_ex samples, Ru-MOF 4 is the most promising one, with the lowest amount of guest
molecules G. In addition, the tiny amount of residual [BPh4] - in 4 was removed after
solvent exchange (Figure 3.6), as confirmed by the absence of the corresponding proton
signals at 7.3 ppm.
Figure 3.10. TG curves of the Ru-MOFs obtained from various Ru-SBUs before (1-4) and after (1-
4_ex) solvent exchange procedure.
From the TGA 1-4_ex samples (Figure 3.10) it is evident that these materials still possess
good thermal stability after utilized solvent exchange and do not decompose until 200 °C.
The shape of the TG curves of the 1_ex and 3_ex does not change after solvent exchange
and suggest a decomposition temperature of 200 °C and 250 °C, respectively (Figure 3.10).
In contrast, of the thermal stability of Ru-MOF 2 substantially decreases after solvent