We next investigated the cyclability and reproducibility of CO2 uptake in the photoresponsive porous liquid on switching between UV (365 nm) and blue (450 nm) light (Figure ). A 12.5 wt. % porous liquid sample was prepared and cycled through 10 experiments where it was continually exposed to UV light for the 'on' experiments, before being exposed to blue (450 nm) light for 10 minutes and then starting the 'off' experiment (Figure ). Overall, the average CO2 uptake was 97.9±2.0 mol/gPL after the porous liquid was exposed to blue light, compared to 90.4±1.6 mol/gPL when the porous liquid was exposed to UV lightthis is a decrease of 7.5 mol/gPL, equating to an 8% reduction of CO2 in the porous liquid when exposed to UV light. While this was lower than the previously observed 16%, we believe this is due to partial saturation since the sample was not left to degas for 24 hours, unlike the initial experiments, but rather was only degassed for 60 minutes between measurements. Hence the sample is likely still partially saturated with gas leading to a lower CO2 capacity and smaller difference when the sample is exposed to UV light. We also studied the gas selectivity of this porous liquid. First, the CH4 uptake was investigated in the neat ionic liquid and in the 20 wt. % porous liquids formed using the three different batches of MOF. Little to no CH4 uptake was observed, and all of the porous liquid uptakes were well below that of the theoretical gas uptakes (Table , S2 and S3). For the MOF with the highest uptake in the solid state, there was a very small increase in CH4 uptake from 4.0 mol/gPL in the neat ionic liquid to 13.4 mol/gPL in the porous liquid; this demonstrates a 13fold increase of CO2 over CH4 for the 20 wt. % porous liquid, which we believe is the highest CO2/CH4 selectivity of any reported porous liquid to date. We ascribe the lack of CH4 uptake in the porous liquid to the very low solubility of methane in the ionic liquid carrier solvent and the preferential CO2 uptake observed in the photoresponsive MOF in the solid-state.