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

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

9.6K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
9.6K
Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

2.0K
2.0K
Network Covalent Solids02:18

Network Covalent Solids

16.2K
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...
16.2K
Covalent Bonds01:29

Covalent Bonds

162.8K
Overview
162.8K
Covalent Bonds01:08

Covalent Bonds

11.2K
Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
11.2K
Covalent Bonding and Lewis Structures02:46

Covalent Bonding and Lewis Structures

61.4K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
61.4K

You might also read

Related Articles

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

Sort by
Same author

Aqueous two-phase extraction enables the chirality and handedness sorting of mechanically interlocked derivatives of SWCNTs.

Nanoscale·2026
Same author

Ultrafast Capture of Per- and Polyfluoroalkyl Substances from Water by Mesoporous Zirconium Metal-Organic Frameworks.

ACS materials letters·2026
Same author

Two-dimensional melt growth of large-scale, single-crystalline hybrid organic-inorganic perovskite films.

Nature communications·2026
Same author

Templating Rules for Mechanically Interlocked Carbon Nanotubes.

Journal of the American Chemical Society·2026
Same author

Charge Density Wave-Induced Highly Sensitive Terahertz Detection Based on a Large Nonlinear Hall Effect.

ACS nano·2026
Same author

Deciphering Competitive Kinetics in Nitrate Reduction via Mechanistic Modeling: Impact of Ru and Pd Dopants on Reaction Selectivity.

Journal of the American Chemical Society·2026

Related Experiment Video

Updated: Feb 5, 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

14.1K

Layer-Stacking-Driven Fluorescence in a Two-Dimensional Imine-Linked Covalent Organic Framework.

Pablo Albacete, José I Martínez1, Xing Li2

  • 1Departamento de Nanoestructuras, Superficies, Recubrimientos y Astrofı́sica Molecular , Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC) , 28049 Madrid , Spain.

Journal of the American Chemical Society
|September 15, 2018
PubMed
Summary

Researchers created two-dimensional imine-based covalent-organic frameworks (COFs) with tunable layer stacking. IMDEA-COF-1 exhibits solid-state fluorescence, a first for imine-linked 2D-COFs, due to controlled pyrene unit arrangement.

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

49.2K
Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
06:45

Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior

Published on: March 8, 2024

9.9K

Related Experiment Videos

Last Updated: Feb 5, 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

14.1K
Synthesis and Characterization of Functionalized Metal-organic Frameworks
11:27

Synthesis and Characterization of Functionalized Metal-organic Frameworks

Published on: September 5, 2014

49.2K
Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
06:45

Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior

Published on: March 8, 2024

9.9K

Area of Science:

  • Materials Science
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Covalent-organic frameworks (COFs) are crystalline porous polymers with tunable structures.
  • Imine-based COFs are synthesized via Schiff-condensation reactions.
  • Controlling the solid-state properties of COFs is crucial for their applications.

Purpose of the Study:

  • To synthesize novel 2D imine-based COFs using 1,6-diaminopyrene (DAP) and tritopic aldehydes.
  • To investigate the effect of layer stacking on the fluorescence properties of these COFs.
  • To demonstrate the first example of an imine-linked 2D-COF with solid-state emission.

Main Methods:

  • Schiff-condensation reactions between DAP and 1,3,5-benzenetricarbaldehyde (BTCA) or 2,4,6-triformylphloroglucinol (TP).
  • Characterization of the resulting COFs (IMDEA-COF-1 and IMDEA-COF-2) using techniques like X-ray diffraction.
  • Photoluminescence spectroscopy to determine emission properties.
  • Theoretical calculations to rationalize packing structures.

Main Results:

  • Formation of two distinct 2D imine-based COFs, IMDEA-COF-1 and IMDEA-COF-2.
  • Observation of significant layer-packing-driven fluorescence in the solid state.
  • Controlled layer stacking (eclipsed or staggered) achieved through chemical design.
  • IMDEA-COF-1 exhibited green emission with a 3.5% absolute photoluminescence quantum yield.
  • Theoretical calculations supported the observed packing preferences.

Conclusions:

  • The study successfully synthesized two novel 2D imine-based COFs with tunable solid-state fluorescence.
  • Controlled layer stacking is a key factor in achieving desirable photophysical properties in COFs.
  • IMDEA-COF-1 represents a significant advancement as the first imine-linked 2D-COF with solid-state emission.