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(a) Reaction scheme of diboronic acid self-condensation into hexagonal 2D COFs. STM images of 2D COFs resulting from monomers polycondsation, (b) 2 monomers, (c) 3 monomers, (d) 5 monomers (insets demonstrate an enlarged view) Reproduced from ref. [7] with permission from the American Chemical Society.
