Shining a Light on Photoresponsive Type III Porous Liquids

08 August 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Porous materials are the subject of extensive research because of potential applications in areas such as gas adsorption and molecular separations. Until recently, most porous materials were solids, but there is now an emerging class of materials known as porous liquids. The incorporation of intrinsic porosity or cavities in a liquid can result in free-flowing materials that are capable of gas uptakes that are significantly higher than conventional non-porous liquids. A handful of porous liquids have also been investigated for gas separations. Until now, the release of gas from porous liquids has relied on molecular displacement (e.g., by adding small solvent molecules), pressure or temperature swings, or sonication. Here, we explore a new method of gas release that involves photoisomerisable porous liquids comprising a photoresponsive MOF dispersed in an ionic liquid. This results in the selective uptake of CO2 over CH4, and allows gas release to be controlled by using UV light.


Porous liquids
Metal-Organic Framework
Ionic liquids
Gas uptake

Supplementary materials

Supporting Information
Contains synthesis and characterisation, and details of the gas adsorption setup and studies.

Supplementary weblinks


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