Figure 4

(a) CO2 sorption isotherms for (t-Bu-G 1 N) 2 measured at 195 K, 273 K and 298 K. (b) CO2 sorption isotherms for CC(t-Bu-G 1 N) 3 measured at 195 K, 273 K and 298 K. (c) CO2 sorption isotherms for (t-Bu-G 2 N) 2 measured at 195 K, 273 K and 298 K. (d) Isosteric heat (Q st) of CO2 sorption for (t-Bu-G 2 N) 2 , CC(t-Bu-G 1 N) 3 and (t-Bu-G 1 N) 2 (only sorption data at 273 K and 298 K were used).