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FT-IR and 13C NMR spectra of CCOFs and starting materials. (a) IR spectra of Tpg, DB, BD, Td, COF-TpgDB, COF-TpgBD, and COF-TpgTd (from bottom to top). (b) 13C NMR spectra of COF-TpgDB (blue). (c) 13C NMR spectra of COF-TpgBD (red). (d) 13C NMR spectra of COF-TpgTd (yellow). (e) Schematics of CCOFs.
