Systematic Screening of DMOF-1 with NH2, NO2, Br and Azobenzene Functionalities for Elucidation of Carbon Dioxide and Nitrogen Separation Properties

Abstract

In this study, dabco MOF-1 (DMOF-1) with four different functional groups (NH<sub>2</sub>, NO<sub>2</sub>, Br and azobenzene) has been successfully synthesized through systematic control of the synthesis condition of their parent framework. The functionalised DMOF-1 is characterized using various analytical techniques including PXRD, TGA and N<sub>2</sub> sorption. The effect of the various functional groups on the performance of the MOFs for post-combustion CO<sub>2</sub> capture is evaluated. DMOF-1s with polar functional groups are found to have better affinity with CO<sub>2</sub> compared with the parent framework as indicated by higher CO<sub>2</sub> heat of adsorption. However, imparting steric hindrance to the framework as in Azo-DMOF-1 enhances CO<sub>2</sub>/N<sub>2</sub> selectivity, potentially as a result of lower N<sub>2</sub> affinity for the framework.

Light-induced switchable adsorption in azobenzene- and stilbene-based porous materials

“…Their findings demonstrated that a high density of azobenzene moieties per MOF unit cell changed the host-guest chemistry, providing the basis for the drastic switchable adsorption results [76]. More recently, an azobenzene functionalized gated MOF was studied for gas sorption by Ladewig and coworkers in 2019 [91].…”