Fig. 2. (a) XRD patterns of COF-1and COF-2; (b) FT-IR spectrum of COF-1 and COF-2; (c) 13C NMR spectra of COF-1 and COF-2; (d) TGA curves of COF-1 and COF-2; (e) N2 adsorption–desorption isotherm, inset: pore-size distribution of COF-1 and COF-2.
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