Conjugated
porous polymers (CPPs) have drawn significant attention
in materials science. We envisioned that simple building blocks may
provide a more general platform for constructing functional CPPs.
Herein, we report a new synthetic strategy to incorporate a simple
boron element building block into CPPs by using efficient boron/tin
(B/Sn) exchange reaction, which is distinct from the commonly employed
Pd-catalyzed C–C coupling toward CPPs in the literature. More
importantly, this synthetic strategy allows us to construct the first
example of the CPPs having the nonprotected B-centers and the highest
B-content reported to date, which is beneficial for strong Lewis acid–base
interactions. The boron (B)-CPPs exhibit the well-defined chemical
structures and the microsized porous structures. This synthetic protocol
also allows us to access the B-CPPs having the smallest aromatic linker
between the B-centers, which can enhance the electronic communications
of the adjacent B-centers and increase Lewis acidity of the B-centers.
Because of the strong electronic communications of the adjacent B-centers
via the p−π* coupling, the B-CPPs exhibit higher Lewis
acidity compared to that of the B-monomer. Combining the high microporosity,
the high Lewis acidity, and small steric protection of the B-centers
endows these B-CPPs with excellent triethylamine and pyridine sensing
and absorptivity properties.
Recently, exploring new type polymerization protocols has been a major driving force in advancing organic polymers into highly functional materials. Herein we report a new polycondensation protocol to implant phosphorus...
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