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CO 2<br />
adsorbed, mmol/g<br />
Chapter 4 99<br />
3.5<br />
3.0<br />
2.5<br />
parent Ru-MOF<br />
2a<br />
2b<br />
2.0<br />
1.5<br />
1.0<br />
0.5<br />
0.0<br />
0 200 400 600 800 1000<br />
P, mbar<br />
Figure 4.35. CO 2 isotherms collected at 298 K for the parent Ru-MOF and DEMOF derivatives 2a<br />
(15%) and 2b (28%) with ip DL. Black circles – parent Ru-MOF; blue triangles – 2a; dark cyan<br />
diamonds – 2b.<br />
The CO2 and H2 adsorption isotherms of 2a and 2b show that 2a exhibits higher uptake.<br />
The adsorption capacity of the sample 2b revealed to be a little lower compared to 2a<br />
while it is still the same as with the parent Ru-MOF (Figures 4.35 and 4.36). Although the<br />
defects B in the Ru-DEMOFs 2a and 2b do not induce ruthenium reduction, vacant-sites<br />
caused from the creation of defects B (missing of Ru-paddlewheels) could still<br />
accommodate gas molecules. In addition, the vacant-sites in the defects B make the gas<br />
molecules access to the surrounding CUS easier. This could be the positive effect of the<br />
defects B in the Ru-DEMOFs with ip DL. On the other hand, the generation of defects B<br />
leads to the partial missing of the di-ruthenium PW units and, hence, the overall CUSs in<br />
Ru-DEMOFs decrease. In the case of Ru-DEMOF 2a, the positive effect of the defects B is<br />
rather dominant and results in the higher H2 and CO2 capacity. But when it comes to 2b,<br />
the negative effect of the defects B eliminates the positive influence on the gas uptake,<br />
which leads to the observation we see in Figures 4.35 and 4.36. The Ru-DEMOFs 1a and<br />
1c featuring higher gas (H2 and CO2) uptake in comparison with 2a (Table 4.6), implying
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