Photoelectric
Covalent Organic Frameworks: Converting
Open Lattices into Ordered Donor–Acceptor Heterojunctions
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Abstract
Ordered
one-dimensional open channels represent the typical porous
structure of two-dimensional covalent organic frameworks (COFs). Here
we report a general synthetic strategy for converting these open lattice
structures into ordered donor–acceptor heterojunctions. A three-component
topological design scheme was explored to prepare electron-donating
intermediate COFs, which upon click reaction were transformed to photoelectric
COFs with segregated donor–acceptor alignments, whereas electron-accepting
buckyballs were spatially confined within the nanochannels via covalent
anchoring on the channel walls. The donor–acceptor heterojunctions
trigger photoinduced electron transfer and allow charge separation
with radical species delocalized in the π-arrays, whereas the
charge separation efficiency was dependent on the buckyball content.
This new donor–acceptor strategy explores both skeletons and
pores of COFs for charge separation and photoenergy conversion