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Updated: Jan 22, 2026
11:27
Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Dehydration-Assisted Rapid Modulated Synthesis of Monodisperse Covalent Organic Framework Single Crystals With
Yixiao Ren1, Jingtian Cheng1, Jiao Xie1
1State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, China.
Small (Weinheim an Der Bergstrasse, Germany)
|January 20, 2026
Summary
Researchers developed a new dehydration-assisted method for rapidly synthesizing tunable covalent organic framework (COF) single crystals. This technique controls crystal size for improved iodine sorption performance.
Area of Science:
- Materials Science
- Crystallography
- Chemical Engineering
Background:
- Controlling mesoscale features of covalent organic framework (COF) single crystals is crucial for structural analysis and performance studies.
- Rapid synthesis of uniform and tunable COF single crystals presents a significant challenge due to complex crystallization processes.
Purpose of the Study:
- To develop an effective strategy for the rapid synthesis of COF single crystals with tunable sizes.
- To elucidate the role of water in the crystallization of imine-linked COFs.
- To investigate the impact of crystal size on sorption properties.
Main Methods:
- A dehydration-assisted modulated synthesis strategy was developed.
- Systematic studies on the role of water in solvothermal and aniline-modulated syntheses were conducted.
- Kinetic analyses of imine-exchange reactions were performed.
- Adjustments to reaction temperature, solvent, and stirring conditions were employed.
Main Results:
- A rapid synthesis of single-crystalline imine-linked 3D COFs (COF-300, COF-303, COF-320) was achieved within 1–3 hours.
- Uniform COF-300 single crystals with sizes tunable from 213 nm to 44.3 µm were synthesized.
- Hydrolysis was identified as a factor retarding crystallization in modulated synthesis.
- Crystal size influenced iodine sorption kinetics and capacity, with smaller crystals showing enhanced performance.
Conclusions:
- The dehydration-assisted modulated strategy enables rapid and size-tunable synthesis of COF single crystals.
- Understanding water's role in crystallization is key to optimizing COF synthesis.
- Tailoring COF crystal size offers a pathway to enhance gas sorption kinetics and capacity.
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