Smart covalent organic networks (CONs) with “on-off-on” light-switchable pores for molecular separation

Jiangtao Liu, Shaofei Wang, Tiefan Huang, Priyanka Manchanda, Edy Abou-Hamad, Suzana Pereira Nunes

Research output: Contribution to journalArticlepeer-review

95 Scopus citations


Development of the new-generation membranes for tunable molecular separation requires materials with abilities beyond strict separation. Stimuli response could remotely adjust the membrane selectivity. Azobenzene derivatives can be photo-switched between trans and cis isomers under ultraviolet or visible light. Here, the azobenzenes were implanted as light switches to bridge the flexible cyclen building blocks. The smart covalent organic network membranes fold and unfold as origami that can be photo-switched between on-state (large) and off-state (small) pores. The cis membranes with off state under ultraviolet (UV) light have higher dye rejection than trans membranes with on-state channels. By controlling the trans-to-cis azobenzene isomerization via UV/Vis light, the pore size can be remotely controlled at the molecular level and the solvent permeance and dye rejection can be dynamically tuned.
Original languageEnglish (US)
Pages (from-to)eabb3188
JournalScience advances
Issue number34
StatePublished - Aug 19 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): URF/1/3441-01-01
Acknowledgements: We thank L. Upadhyaya, D. Mahalingam, and B. Pulido for valuable assistance and fruitful discussion in the research process. The schematic illustration in Fig. 1 was produced by X. Pita, scientific illustrator at King Abdullah University of Science and Technology (KAUST)


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