A Transformation Strategy for Highly Crystalline Covalent Triazine Frameworks: from Staggered AB to Eclipsed AA Stacking.

Fabrication of crystalline covalent triazine frameworks (CTFs) under mild conditions without induction of carbonization is a long-term challenging subject. Herein, a tandem transfor-mation strategy was demonstrated for the preparation of highly crystalline CTFs with high surface areas under mild, metal- and solvent-free conditions. CTF-1 with a staggered AB stacking order (orange powder) obtained in the presence of a catalytic amount of superacid at 250 C was transformed to highly crystalline CTF-1 with an eclipsed AA stacking order (greenish powder) and surface area of 646 m2 g-1 through annealing at 350 C under nitrogen. The strategy can be ex-tended to the production of crystalline fluorinated CTFs with controllable fluorine content. This finding unlocks opportunities to design crystalline CTFs with tunable photoelectric properties.

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