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V, cm 3 /g<br />
118 Chapter 4<br />
500<br />
400<br />
300<br />
200<br />
100<br />
/ Cu-BTC<br />
/ D5<br />
/ D6<br />
/ D7<br />
/ D8<br />
0<br />
0.0 0.2 0.4 0.6 0.8 1.0<br />
relative pressure, p/p 0<br />
Figure 4.49. N 2 sorption isotherms collected at 77 K for the Cu-DEMOF samples D5-8 in<br />
comparison with the parent Cu-BTC. Closed and opened symbols represent the adsorption and<br />
desorption isotherms, respectively. Black circles - Cu-BTC; olive triangles - D5; olive stars - D6;<br />
magenta diamonds - D7; magenta squares - D8. Metal source: Cu(NO 3 ) 2 3H 2 O. Solvent utilized for<br />
the synthesis of the D5 and D6 (olive): DMF +HBF 4 ; for D7 and D8 (magenta): DMF.<br />
increased SBET in comparison with the parent Cu-BTC (1561 m 2 /g) (Table 4.9). In fact, the<br />
porosity of these samples rises along with the increase of incorporated amount of ip, no<br />
matter whether DMF or EtOH has been used. Thus, enhanced porosity provides indirect<br />
indications on absence of unreacted H2ip and proves the in-framework incorporation of<br />
ip in these solids. Remarkably, Cu-DEMOF sample D2 (25% of ip incorporation) reveals<br />
the highest SBET (2030 m 2 /g) among all the samples. Furthermore, solids D6, repeated<br />
following communicated earlier method, show a little lower SBET than the reported values<br />
(2030 m 2 /g). [140] Unfortunately, there is no exact reported SBET value for D5. Only a<br />
general increase trend of SBET value along with the incorporation amount of ip was given<br />
in the earlier report. However, in current study, incorporation of higher quantity of ip, as<br />
in the case of sample D6, leads to the decreased porosity instead in comparison with D5.<br />
Similar trend has been traced for the solids D7 and D8, where the latter sample reveals a<br />
little lower SBET value than the former. Consequently, it might be possible that some guest