Fig. 2: Structural characterization data.

a FT-IR spectra of Im-COF-1a and IQO-COF-1, b Solid-state CP-MAS 13C NMR spectra of 13C-isotope enriched Im-COF-1a and IQO-COF-1. c High resolution N 1 s XPS spectra of Im-COF-1a and IQO-COF-1. d, e Experimental, Pawley-refined and simulated eclipsed AA stacking PXRD patterns of IQO-COF-1 and IQO-COF-2. f N2 sorption isotherms at 77 K of Im-COF-1a and IQO-COF-1 (inset: pore size distribution). g, h HR-TEM image of IQO-COF-1 and IQO-COF-2 (inset: enlargement of selected area and the FFT patterns). i PXRD patterns of as-prepared IQO-COF-1 after being subjected to different harsh chemical conditions. TFA, trifluoroacetic acid.