Extended Data Fig. 1: CO2 adsorption structures in COF-999.
From: Carbon dioxide capture from open air using covalent organic frameworks
a, Formation of carbamic acid under dry conditions. b, Formation of carbamic acid/carbamate under humid conditions. c, Formation of bicarbonate under humid conditions. All numbers represent atom distances in pm. C, gray; N, blue; O, red; H, white. Additional structures are shown in Supplementary Information section 14.
