
S9
made phases, and by immersion of the reaction chamber into solid carbon dioxide contained in a
cryogenic vessel (at 198 K) during isotherm measurement. Samples were desolvated at 150°C
under high dynamic vacuum (10
-7
mbar) until a constant mass had been reached; typically
overnight. The carbon-dioxide (SFC grade) used for this study was supplied by BOC gases. All
admittance pipe work was thoroughly decontaminated under high vacuum prior to the admission
of any gas, and an activated carbon standard of known surface area was used to validate all
measurement protocols. All isotherm data points were fitted by the IGASwin systems software
v.1.03.84 (Hiden Isochema 2002) using a linear driving force model, and all data were corrected
for buoyancy effects. The CO
2
sorption and desorption isotherms for 1 are shown in Figure S5.
The corresponding isotherms for 2 can be found in Figure 3.
CO
2
Sorption for 1
0
2
4
6
8
10
12
14
16
18
20
0 0.1 0.2 0.3 0.4 0.5 0.6
P / P
0
CO
2
Uptake (% mass)
ads
desorp
Figure S5. Sorption-desorption isotherm of 1 at 198 K obtained with CO
2
gas over the pressure
range 2-1000 mbar (relative pressure range from 6 x 10
-5
to 0.5)
5. TGA Measurements
Thermogravimetric analysis (TGA) was conducted using a Perkin-Elmer Pyris 1 TGA instrument
with heating under N
2
at 5 ºC min
-1
from room temperature to 600 ºC for 1 and 2. The TGA
traces for 1 and 2 are shown in Figures S6 and S7, respectively.
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