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