Fig. 4: Redox-triggered switching process.
From: Redox-triggered switching in three-dimensional covalent organic frameworks
a Reversible crystal structures transformation between 3D-TPB-COF-HQ and 3D-TPB-COF-Q. b Solid-state 13C NMR spectra of 3D-TPB-COF-HQ during the oxidation/reduction process. (c) PXRD patterns of 3D-TPB-COF-HQ during oxidation/reduction process. Note: 3D-TPB-COF-HQ (black line); oxidation for 2 min (red line); oxidation for 40 min (blue line); oxidation for 90 min (3D-TPB-COF-Q, green line); reduction for 30 min (dark violet line); reduction for 60 min (sienna line); reduction for 90 min (3D-TPB-COF-HQ (R), cyan line). Inset: the pictures of corresponding materials.
