Proton-exchange membrane
fuel cells are promising energy devices
for a sustainable future due to green features, high power density,
and mild operating conditions. A facile proton-conducting membrane
plays a pivotal role to boost the efficiency of fuel cells, and hence
focused research in this area is highly desirable. Major issues associated
with the successful example of Nafion resulted in the search for alternate
proton conducting materials. Even though proton carrier loaded crystalline
porous organic frameworks have been used for proton-conduction, the
weak host–guest interactions limited their practical use. Herein,
we developed a crystalline 2D-polymer composed of benzimidazole units
as the integral part, prepared by the condensation of aryl acid and
diamine in polyphosphoric acid medium. The imidazole linked-2D-polymer
exhibits ultrahigh proton conductivity (3.2 × 10–2 S cm–1) (at 95% relative humidity and 95 °C)
in the pristine state, which is highest among the undoped porous organic
frameworks so far reported. The present strategy of a crystalline
proton-conducting 2D-polymer will lead to the development of new high
performing crystalline solid proton conductor.
Solvent-free organic liquids have been known for their excellent luminescent features. Hence, the recent developments in this area have marked them as potential emitters with high quantum yield and enhanced...
Aesthetic designs from nature enable new knowledge to be gained and, at the same time, inspire scientific models. In this context, multicomponent macrocycles embody the advantage of precisely positioning the structural units to achieve efficient communication between them. However, the construction of a functionalizable macrocycle for ultrafast charge separation and stabilization has not been attempted. Herein, we report the synthesis, crystal structure, and transient absorption of a new functionalizable macrocycle consisting of an oligothiophene-ring-strapped perylene bisimide. Transient absorption results point to a sequential improvement in charge separation and stabilization from the macrocycle to the corresponding linear dimer and 2D polymer due to the unique design. Our macrocycle design with a supportive spatial arrangement of the donor and acceptor units will inspire the development of more complex synthetic systems with exciting electron-transfer and charge-separation features.
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