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

Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.7K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
3.7K
Covalent Bonds01:29

Covalent Bonds

166.0K
Overview
166.0K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.2K
Intermolecular Forces03:13

Intermolecular Forces

74.0K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
74.0K
Network Covalent Solids02:18

Network Covalent Solids

16.3K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.3K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

4.0K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
4.0K

You might also read

Related Articles

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

Sort by
Same author

Designing stable π-radicals.

Chemical Society reviews·2026
Same author

Why Are Verdazyl Radicals Nonemissive?

The journal of physical chemistry. A·2026
Same author

Poling-free integrated second-order nonlinear optics with evaporated organic thin films.

Science advances·2026
Same author

Aspiration Pneumonia as a Marker of a High Healthcare Utilisation Trajectory in Older Adults With Dementia: A Retrospective Cohort Study.

Australasian journal on ageing·2026
Same author

Halogen-bonded self-assembly of mononuclear lanthanide(III) complexes: variable temperature photoluminescence study and sensing of nitroaromatics.

Dalton transactions (Cambridge, England : 2003)·2026
Same author

Intermolecular C─H···M (M = Fe and V) Interactions in Metalloporphyrins: A Combined Experimental and Computational Perspective.

Chemphyschem : a European journal of chemical physics and physical chemistry·2026
Same journal

A Lithium Superionic Conductor Softened by Nonmetal-Chlorine Chemical Bonds.

Journal of the American Chemical Society·2026
Same journal

A Ferrocene Metal-Ligand Triplet Diradical with a Terminal Iminyl Group Discovered by Time-Resolved Mid-Infrared Spectroscopy.

Journal of the American Chemical Society·2026
Same journal

Regulating Li-Ion Transport via Solvent and Ion Clustering Using Ternary Salts in Nonfluorinated Solvents for Extended Cyclability of Zero-Excess Lithium-Metal Batteries.

Journal of the American Chemical Society·2026
Same journal

Terahertz-Field-Induced Dissociation of Frenkel Excitons in Organic Semiconductors.

Journal of the American Chemical Society·2026
Same journal

Interplay between Slow Chirality Inversion and Slow Guest Uptake in a Triple-Helical Closed-Cage Metallocryptand.

Journal of the American Chemical Society·2026
Same journal

Controlled Sulfane Sulfur Delivery via Allyl Disulfide Rearrangement-Mediated Thiosulfoxide Formation.

Journal of the American Chemical Society·2026
See all related articles

Related Experiment Video

Updated: Feb 27, 2026

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

14.2K

Merocyanine-Linked Zwitterionic Covalent Organic Frameworks.

Zhechang He1, Cheng-Hao Liu1, Ting Yu1

  • 1Department of Chemistry, McGill University, 801 Sherbrooke Street W, Montréal, Quebec H3A 0B8, Canada.

Journal of the American Chemical Society
|February 26, 2026
PubMed
Summary
This summary is machine-generated.

We synthesized novel zwitterionic merocyanine-based covalent organic frameworks (COFs). These materials exhibit tunable properties, including reversible color changes and pore size adjustments based on medium polarity.

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

49.3K
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
05:26

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

3.9K

Related Experiment Videos

Last Updated: Feb 27, 2026

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

14.2K
Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

49.3K
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
05:26

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

3.9K

Area of Science:

  • Materials Science
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Merocyanines are π-conjugated systems known for their zwitterionic nature and optoelectronic properties.
  • Covalent Organic Frameworks (COFs) offer tunable structures and functionalities for advanced applications.

Purpose of the Study:

  • To synthesize the first merocyanine-based C=C-linked COFs.
  • To investigate the optoelectronic properties and stimuli-responsive behavior of these novel COFs.

Main Methods:

  • Condensation reaction between N-alkylcollidinium salts and hydroxytrimesic aldehyde.
  • Characterization using UV-Vis spectroscopy, DFT calculations, and time-resolved spectroscopy.
  • Preparation of thin films via heterogeneous nucleation.

Main Results:

  • Successful synthesis of stable, zwitterionic merocyanine-based COFs with charge-transfer absorption up to 850 nm.
  • Demonstrated pore contraction/expansion in response to medium polarity, leading to macroscopic changes.
  • Observed reversible color transitions (black to yellow) upon protonation.
  • DFT calculations indicated omnidirectional π-conjugation and large band dispersions.
  • Thin films exhibited vertical 2D sheet orientation, stimulated emission, and long-lived excited states.

Conclusions:

  • The developed merocyanine-based COFs represent a new class of functional materials.
  • Their stimuli-responsive behavior and optoelectronic properties hold promise for applications in sensors and optoelectronics.