Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 20, Pages 6600-6604Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900141
Keywords
active sites; adsorbents; metal-organic frameworks; photoresponsive systems
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Funding
- National Science Fund for Excellent Young Scholars [21722606]
- National Natural Science Foundation of China [21676138, 21878149, 21808110, 21576137]
- China Postdoctoral Science Foundation [2018M632295]
- Six Talent Plan [2016XCL031]
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Photoresponsive metal-organic frameworks (PMOFs) are of interest for tailorable CO2 adsorption. However, modulation of CO2 adsorption on PMOFs is based on steric hindrance or structural change owing to weak interactions between CO2 and active sites. It is challenging to fabricate PMOFs with strong but tailorable sites for CO2 adsorption. Now, the construction of PMOFs with target-specific (strong) active sites is achieved by introducing tetraethylenepentamine into azobenzene-functionalized MOFs for tailorable CO2 adsorption. Amines are specific active sites for CO2, contributing to capture CO2 selectively. Cis/trans isomerization of azobenzene motifs trigged by UV/Vis light adjusts the electrostatic potential of amines significantly, leading to exposure/shelter of amines and modulation of CO2 adsorption on strong active sites. This system enables us to design adsorption processes for CO2 capture from mixtures, which is impossible to realize by traditional PMOFs.
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