Covalent organic frameworks (COFs), a class of crystalline porous polymers that allow the atomic precise integration of organic building blocks into periodicities, have emerged as a novel media for designing and synthesizing advanced organic materials. Because of their high surface area, excellent thermal stability, and low densities, COFs have emerged as a new media for gas adsorption. We have synthesized various COFs with π electronic building blocks and developed light-emitting, semiconducting, photoconducting, and charge separating properties.
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