Fig. 2: Structural aspects of COF.

Simulated structure of a COF-DT, b COF-DT-SO₃H, and c COF-DT-SO₃Na (Colors: blue—N, gray—C, red—O, yellow—S, pink—Na, white—H) with the pore sizes of 3.3, 2.5, and 2.4 nm, respectively. The powder-sample images under visible light of d COF-DT, e COF-DT-SO₃H, and f COF-DT-SO₃Na.