Extended Data Fig. 5: 13C CP/MAS solid-state NMR spectra of COF-992-CN to COF-995-CN and COF-992 to COF-995.
From: Crystalline coumarin-linked covalent organic frameworks
a, 13C solid-state NMR spectra of COF-992-CN and COF-992. b, 13C solid-state NMR spectra of COF-993-CN and COF-993. c, 13C solid-state NMR spectra of COF-994-CN and COF-994. d, 13C solid-state NMR spectra of COF-995-CN and COF-995.
