Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

1.3K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.3K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.3K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.3K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.8K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.8K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

3.2K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
3.2K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.5K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Infrared Spectroelectrochemical Insights into Rhenium-Based Supramolecular Assemblies for Electron Storage and Transfer.

Inorganic chemistry·2026
Same author

Tracking Optical Phonon Dynamics in InP Nanocrystals via Transient Absorption and Femtosecond Stimulated Raman Spectroscopy.

ACS nano·2026
Same author

Synthesis of Two-Dimensional Mechanically Interlocked Polymers at the Hundred-Gram Scale.

Journal of the American Chemical Society·2026
Same author

Comparative evaluation of PFAS-selective adsorbents in hard-to-treat residual waste streams.

Chemical engineering journal (Lausanne, Switzerland : 1996)·2026
Same author

Phonon modulation of strongly coupled gold tetrahedral plasmonic nanoparticles and a carbocyanine J-aggregate.

Nanoscale·2026
Same author

Probing the External Surface Chemistry of Imine-Based Covalent Organic Frameworks Using Reactive Organic Dyes.

Journal of the American Chemical Society·2026

Related Experiment Video

Updated: Oct 6, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

13.6K

Solvothermal depolymerization and recrystallization of imine-linked two-dimensional covalent organic frameworks.

Woojung Ji1, Leslie S Hamachi1,2, Anusree Natraj1

  • 1Department of Chemistry, Northwestern University 2145 Sheridan Road Evanston IL 60208 USA wdichtel@northwestern.edu.

Chemical Science
|January 13, 2022
PubMed
Summary

Researchers discovered that heating 2D imine-linked covalent organic frameworks (COFs) causes them to depolymerize and then repolymerize with improved crystallinity and porosity. This solvothermal recrystallization offers a new method for enhancing 2D COF materials quality.

More Related Videos

Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

48.4K
Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

7.5K

Related Experiment Videos

Last Updated: Oct 6, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

13.6K
Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

48.4K
Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

7.5K

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Understanding the formation and growth of imine-linked 2D covalent organic frameworks (COFs) is crucial for improving their material quality and achieving larger crystallite sizes.
  • Current limitations in 2D COF quality and size hinder their potential applications and the advancement of 2D polymerization techniques.

Purpose of the Study:

  • To investigate a novel temperature-dependent depolymerization mechanism in colloidal 2D imine-linked COFs.
  • To develop a new method for enhancing the crystallinity and material quality of 2D COFs through controlled depolymerization and repolymerization.

Main Methods:

  • Characterization of 2D COF crystallinity and porosity using X-ray diffraction, infrared spectroscopy, and N2 porosimetry.
  • In situ monitoring of COF crystallinity evolution during solvothermal processes using wide-angle X-ray scattering.
  • Quantification of free COF monomer concentrations versus temperature via variable temperature 1H NMR spectroscopy.

Main Results:

  • A previously unknown temperature-dependent depolymerization of 2D imine-linked COFs was observed upon heating to 90 °C.
  • Repolymerization upon cooling led to significantly improved crystallinity and porosity, as demonstrated with TAPB-PDA COF.
  • The extent of depolymerization is dependent on the specific COF structure and its initial material quality, with TAPB-DMTA COF showing partial depolymerization.

Conclusions:

  • Solvothermal depolymerization and repolymerization provide an effective strategy for recrystallizing and enhancing the quality of 2D COFs.
  • Material quality and network-dependent properties, such as interlayer interactions, influence the stability of 2D COFs against depolymerization.
  • This work offers a new approach for solvent annealing 2D COFs and may guide conditions for synthesizing large-area 2D polymers.