Next, sorption studies were carried out to investigate the porosity of the material in its different phases. First, the CO2 uptakes of both the [Ald-IM][NTf2] and a[RCC1-IM][NTf2]6 were measured for comparison (298K, 1 bar), and to see the effect on uptake on incorporation of the RCC1 core (Fig. ). The quantity of CO2 adsorbed by a[RCC1-IM][NTf2]6 was found to be threefold higher than just the bulky imidazolium ionic liquid [Ald-IM][NTf2] (218±2.8 µmol/g vs 76±1.3 µmol/g, respectively). However, when taking into account the molecular weights of the two materials, the CO2 solubility in a[RCC1-IM][NTf2]6 far exceeds that of [Ald-IM][NTf2] (0.78 vs 0.04 molCO2/molIL, respectively) with the latter being similar to analogous ionic liquids such as [BMIM][NTf2] (75±2.8 µmol/g, 0.03 molCO2/molIL). Subsequently, the CO2 uptake was measured at 373 K (100 °C), enabling the uptake of the organic-cage derived ionic liquid l[RCC1-IM][NTf2]6 to be assessed in its melted state (Fig. ). While the volume of the sample visibly reduced on melting, and stirring of the thin layer of clear yellow viscous liquid was not possible, the measured uptake of l[RCC1-IM][NTf2]6 (198±6.58 µmol/g; 0.71 molCO2/molIL) was similar to that of the solid a[RCC1-IM][NTf2]6 at 298 K. Finally, the CO2 uptake after cooling back to 298 K was repeated to study the uptake of the ag[RCC1-IM][NTf2]6 material, which was also similar to both the amorphous and liquid phases (204±1.68 µmol/g; 0.73 molCO2/molIL). Measurements were also repeated over two samples to ensure reproducibility. For context, the CO2 uptake in this organic cage-based ionic liquid is comparable to that of our previously reported 20 wt% type III porous liquid of CC3-R/CC3-S in [BPy][NTf2] at room temperature (209.8 ± 6.7 µmol/g), and the CO2 uptake in ag[RCC1-IM][NTf2]6 is on the same order of magnitude as our previously reported meltquenched glass formed from RCC3, albeit slightly lower, which is likely due to the increased number of secondary amines in the latter.