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Crystallinities/morphologies of nano-/micromaterials are decisive features for their applications and can be controlled by both kinetics and thermodynamics. Adding competitors as reversible terminators/inhibitors slows down the reaction, permitting thermodynamic control of the reaction and generation of more ordered products. Here, we introduce a reversible polycondensation-termination method to switch a kinetically controlled (irreversible) reaction to thermodynamic control for the synthesis of an emerging nanoporous material, specifically a 2D covalent organic framework with high crystallinity and well-defined morphology.

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