Interfacial polymerization with COF monomers and Sc(OTf) 3 afforded large-area (several cm 2) free-standing films with tunable thickness (2.5 nm to 100 mm). When the films were thick (100 mm), they exhibited X-ray diffraction corresponding to the expected crystalline structure. The films were integrated into the thin-film composite membranes for water nanofiltration, where they showed enhanced rejection of model pollutant Rhodamine WT.
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