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We report structures of polycrystalline frameworks by uncovering the coexistence of different morphologies and their static and dynamic behaviors, disclosing a realistic picture and multiple-scale insights into structures of the most frequently used polycrystalline frameworks. Visualization with high-resolution transmission electron microscopy revealed four distinct morphologies, i.e., nanoparticle aggregates, nanorod aggregates, ultrathin nanosheets, and parasitic fusion entities. Moreover, direct visualization revealed the existence of different polygons and channels and their contents together with their boundaries and unstructured complements.

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  This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © 2025 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work seehttps://doi.org/10.1021/jacs.5c09081.

Keyword: covalent organic framework, transmission electron microscopy

Date published: 2025-07-30

Publisher: American Chemical Society

Journal:

• Journal of the American Chemical Society (ISSN: 00027863) vol. 147 issue. 30 p. 26955-26968

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5800

First published URL: https://doi.org/10.1021/jacs.5c09081

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Updated at: 2025-10-09 11:28:57 +0900

Published on MDR: 2026-07-18 08:27:29 +0900