A robust photo-responsive zirconium metal-organic framework for tailorable CO2 capture

A metal–organic cage with light-switchable motifs for controllable CO2 adsorption

“…S4†), a distinct band at 1558 cm −1 was observed, which corresponds to the stretching vibration of the NN double bond. 46 Such an observation serves as clear evidence for the successful integration of azobenzene groups within NUT-102. Also, X-ray photoelectron spectroscopy (XPS) was carried out to further analyze the composition of NUT-102.…”

Pore engineering of metal–organic frameworks for boosting low-pressure CO2 capture

“…Very recently, Sun's group attempted to incorporate azobenzene groups into the framework of UiO-67. 178 The trans -isomers transform into cis -isomers with light irradiation changed from visible to UV. Furthermore, DFT calculations proved that the adjustable CO 2 adsorption capacity between these two isomers stemmed from the difference in their polarity and CO 2 binding energy ( trans -azobenzene state: −33 kJ mol; cis -azobenzene state: −31 kJ mol −1 ).…”

Emerging porous materials for carbon dioxide adsorptive capture: progress and challenges

“…Recently, stimuli-responsive porous materials have been considered promising candidates for CO 2 sieving, among which light-responsive materials with dynamic structural variation have attracted a lot of attention due to their fascinating features, such as rapid responsiveness, high precision, and few undesired byproducts. 100–102 Integrating photochromic molecules such as azobenzene and its derivatives into the skeleton is a widely used strategy to construct light-responsive materials, which present reversible isomerization upon irradiation, further achieving interesting CO 2 swing adsorption behaviour. 103 For example, Zn(AzDC)(4,4′-BPE) 0.5 (AzDC: 4,4′-dicarboxylate; 4,4′-BPE: trans -1,2-bis(4-pyridyl)ethylene), a triply interpenetrated framework demonstrated cis – trans photoisomerizability, with 42% desorption capacity under static irradiation conditions, and as much as 64% during dynamic measurements, which resulted from the coordination of 4,4′-BPE to Zn units.…”