Statistical Representation of Stacking Disorder in Layered Covalent Organic Frameworks

Yingying Zhang, Miroslav Položij, Thomas Heine

Research output: Contribution to journalArticlepeer-review

Abstract

Covalent organic frameworks (COFs) are among the fastest-growing classes of materials with an almost unlimited number of achievable structures, topologies, and functionalities. The exact structure of layered COFs is, however, hard to determine due to an often significant mismatch between experimental powder X-ray diffraction (PXRD) pattern and predicted geometries. We attribute these discrepancies to an inherent disorder in the stacking of layered COFs, invalidating standard theoretical three-dimensional (3D) models. We have represented the structures of COF-1, COF-5, and ZnPc-pz by stacking layers following the Maxwell-Boltzmann energy distribution of their stacking modes. The simulated PXRD patterns of the statistical COF models are close to the experimental ones, featuring an unprecedented agreement in peak intensity, width, and asymmetry. The rarely considered ABC stacking mode proved to be important in layered COFs, as well as including solvent molecules. Our model also shows several general features in PXRD originating from the stacking disorder.

Original languageEnglish
Pages (from-to)2376-2381
Number of pages6
JournalChemistry of Materials
Volume34
Issue number5
DOIs
Publication statusPublished - 2022 Mar 8

Bibliographical note

Funding Information:
The authors gratefully acknowledge ZIH Dresden for computer time. Y.Z. acknowledges China Scholarship Council. M.P. acknowledges the Alexander-von-Humboldt Foundation for funding. All authors thank Deutsche Forschungsgemeinschaft for support within CRC 1415.

Funding Information:
China Scholarship Council, Alexander-von Humboldt foundation, Deutsche Forschungsgemeinschaft (CRC 1415).

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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