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. 2015 Oct 12;5:14650. doi: 10.1038/srep14650

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Copyright © 2015, Macmillan Publishers Limited

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The 2 × 2 pore structures of the double-stage COFs are presented. The double-stage strategy generates hexagonal, rhombic and tetragonal COFs with different π-column orderings and different pore sizes and shapes, increasing the diversity and complexity of COF structures.