Improved Synthesis of β-Ketoenamine-Linked Covalent Organic Frameworks via Monomer Exchange Reactions
2018
β-ketoenamine-linked covalent organic frameworks (COFs) offer
excellent structural versatility and outstanding aqueous stability,
but their less dynamic linkages complicate obtaining samples with
high crystallinity and surface areas that approach theoretical
values. In contrast, imine-linked COFs are often isolated with
superior materials quality. Here we synthesize several β-
ketoenamine-linked COFs, including two unreported structures,
with unmatched crystallinity and high surface areas by preparing
the topologically equivalent imine-linked COF and exchanging its
triformylbenzene monomers with triformylphloroglucinol.
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