Morphological Tuning of Covalent Organic Framework Single Crystals
Jie Zhang1, Zitao Wang1, Jinquan Suo1
1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, P. R. China.
Journal of the American Chemical Society
|December 13, 2024
Summary
Researchers developed a simple method to control the shape of covalent organic frameworks (COFs) single crystals. Modifying aniline levels precisely tuned crystal morphology, impacting their adsorption properties for Rh B.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Crystallography
Background:
- Synthesizing high-quality single-crystal covalent organic frameworks (COFs) with controlled morphologies remains a significant challenge.
- Precise control over crystal shape is crucial for tailoring material properties and functionalities.
Purpose of the Study:
- To develop a straightforward strategy for fine-tuning the morphology of COF single crystals.
- To investigate the influence of crystal aspect ratio on adsorption properties.
Main Methods:
- Utilized rigid triptycene derivatives as building blocks for COF synthesis.
- Varied aniline modulator concentrations to control crystal growth and morphology.
- Characterized synthesized COFs using Powder X-ray Diffraction (PXRD), Transmission Electron Microscopy (TEM), and N2 adsorption analysis.
- Employed Density Functional Theory (DFT) calculations to elucidate the growth mechanism.
Main Results:
- Successfully synthesized a series of high-quality COF single crystals (JUC-663-X) with diverse aspect ratios and defined facets.
- Confirmed structural consistency of the synthesized COFs.
- Elucidated the critical role of aniline as a modulator in anisotropic crystal growth.
- Demonstrated a significant influence of crystal aspect ratio on the adsorption properties of Rhodamine B (Rh B).
Conclusions:
- The developed strategy offers precise morphological control over COF single crystals.
- Aniline acts as a key modulator in directing anisotropic crystal growth.
- COF morphology directly impacts functional performance, specifically adsorption capabilities.
- This work opens new avenues for designing and synthesizing COFs with tailored properties.
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