resolver

V, cm 3 /g
Chapter 4 117
more) in comparison with syntheses performed in EtOH. Thus, the protic EtOH solvent
probably slows down to a certain degree the BTC↔ip substitution rate. Therefore, it is
not surprising that the above-mentioned samples prepared from Cu(NO3)2·3H2O using
EtOH instead of DMF are not phase-pure solids (Figure 7.23).
600
500
400
300
200
100
/ Cu-BTC
/ D1
/ D2
/ D3
/ D4
0
0.0 0.2 0.4 0.6 0.8 1.0
relative pressure, p/p 0
Figure 4.48. N 2 sorption isotherms collected at 77 K for the Cu-DEMOF samples D1-4 in
comparison with the parent Cu-BTC. Closed and opened symbols represent the adsorption and
desorption isotherms, respectively. Black circles - Cu-BTC; blue triangles - D1; blue stars - D2; red
diamonds - D3; red squares - D4. Metal source: Cu(BF 4 ) 2 ·6H 2 O. Solvent employed for the synthesis
of the D1 and D2 (blue): DMF; for D3 and D4 (red): EtOH.
All N2 sorption isotherms recorded at 77 K for Cu-DEMOFs D1-8 as well as the parent Cu-
BTC show type I isotherms without any hysteresis loop (Figures 4.48, 4.49), suggesting
their microporosity. To recall and opposed to these observations, in the Cu-DEMOFs with
pydc or 5-X-ip DLs (X = NO2, CN, or OH), the generation of mesopores were reported. [139]
This different behavior indicates, that the defects in Cu-DEMOFs prepared in current work
tend to be isolated rather than correlated as in earlier reported homologous frameworks
(Figure 4.17). Interestingly, all Cu-DEMOFs synthesized from Cu(BF4)2·6H2O (D1-4) show