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Issue 13, 2019
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Controlled growth of imine-linked two-dimensional covalent organic framework nanoparticles

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Abstract

Covalent organic frameworks (COFs) consist of monomers arranged in predictable structures with emergent properties. However, improved crystallinity, porosity, and solution processability remain major challenges. To this end, colloidal COF nanoparticles are useful for mechanistic studies of nucleation and growth and enable advanced spectroscopy and solution processing of thin films. Here we present a general approach to synthesize imine-linked 2D COF nanoparticles and control their size by favoring imine polymerization while preventing the nucleation of new particles. The method yields uniform, crystalline, and high-surface-area particles and is applicable to several imine-linked COFs. In situ X-ray scattering experiments reveal the nucleation of amorphous polymers, which crystallize via imine exchange processes during and after particle growth, consistent with previous mechanistic studies of imine-linked COF powders. The separation of particle formation and growth processes offers control of particle size and may enable further improvements in crystallinity in the future.

Graphical abstract: Controlled growth of imine-linked two-dimensional covalent organic framework nanoparticles

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Publication details

The article was received on 18 Jan 2019, accepted on 20 Feb 2019 and first published on 21 Feb 2019


Article type: Edge Article
DOI: 10.1039/C9SC00289H
Chem. Sci., 2019,10, 3796-3801
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Controlled growth of imine-linked two-dimensional covalent organic framework nanoparticles

    Rebecca L. Li, N. C. Flanders, A. M. Evans, W. Ji, I. Castano, L. X. Chen, N. C. Gianneschi and W. R. Dichtel, Chem. Sci., 2019, 10, 3796
    DOI: 10.1039/C9SC00289H

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