Fig. 1 | Nature Communications

Fig. 1

From: Two-dimensional semiconducting covalent organic frameworks via condensation at arylmethyl carbon atoms

Fig. 1

Chemical structures of the C = C bond linked covalent organic frameworks. a Representative two examples of 2D covalent organic frameworks with carbon–carbon double bond (C = C) linkages through Knoevenagel condensation at methylene carbon atoms by using inorganic base catalysts. b Metal-free approach to the target 2D covalent organic framework (g – C40N3-COF) with C = C linkages via condensation at arylmethyl carbon atoms upon organic base catalysis

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