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

Lewis Acids and Bases02:33

Lewis Acids and Bases

48.4K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
48.4K
Lewis Acids and Bases02:16

Lewis Acids and Bases

17.3K
This lesson delves into Lewis acids and bases in the context of the octet rule for electron-deficient compounds. Here, the concept is discussed, emphasizing the group 13 elements like boron or aluminium. Since group 13 elements possess three valence electrons, they form trivalent compounds with a sextet of electrons and a vacant orbital for the central atom. Consequently, these electron-deficient compounds accept electrons from other species to complete their octet in a chemical reaction. They...
17.3K
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
Catalysis02:50

Catalysis

30.6K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
30.6K
Lewis Symbols and the Octet Rule02:36

Lewis Symbols and the Octet Rule

81.0K
Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis developed a model called the Lewis model that simplified the depiction of chemical bond formation and provided straightforward explanations for the chemical bonds seen in most common compounds.
81.0K
Covalent Bonds01:29

Covalent Bonds

162.8K
Overview
162.8K

You might also read

Related Articles

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

Sort by
Same author

Sublytic C5b-9 triggers glomerular mesangial cell apoptosis in rat Thy-1 nephritis via Gadd45 activation mediated by Egr-1 and p300-dependent ATF3 acetylation.

Journal of molecular cell biology·2016
Same author

Improving the hydrogen selectivity of graphene oxide membranes by reducing non-selective pores with intergrown ZIF-8 crystals.

Chemical communications (Cambridge, England)·2016
Same author

The Association Between Genetic Polymorphism rs703842 in CYP27B1 and Multiple Sclerosis: A Meta-Analysis.

Medicine·2016
Same author

High-Flexibility, High-Toughness Double-Cross-Linked Chitin Hydrogels by Sequential Chemical and Physical Cross-Linkings.

Advanced materials (Deerfield Beach, Fla.)·2016
Same author

Synthesis, structure, and magnetic and catalytic properties of metal frameworks with 2,2'-dinitro-4,4'-biphenyldicarboxylate and imidazole-containing tripodal ligands.

Dalton transactions (Cambridge, England : 2003)·2016
Same author

Reactive oxygen species and hormone signaling cascades in endophytic bacterium induced essential oil accumulation in Atractylodes lancea.

Planta·2016

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

Hydrazone-based covalent organic frameworks for Lewis acid catalysis.

Tanay Kundu1, Jian Wang, Youdong Cheng

  • 1Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore. chezhao@nus.edu.sg.

Dalton Transactions (Cambridge, England : 2003)
|September 19, 2018
PubMed
Summary

Two new hydroxy-rich hydrazone-based covalent organic frameworks (COFs) were synthesized and functionalized with cobalt. These novel COFs demonstrate size-selective Lewis acid catalysis for aldehyde cyanosilylation reactions.

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: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
04:51

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

Published on: June 23, 2023

4.2K

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: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
04:51

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

Published on: June 23, 2023

4.2K

Area of Science:

  • Materials Science
  • Catalysis
  • Organic Chemistry

Background:

  • Hydrazone-based covalent organic frameworks (COFs) offer rich functionality but lack diversity and broad applications.
  • Developing novel COFs with enhanced properties is crucial for advancing materials science and catalysis.

Purpose of the Study:

  • To synthesize novel hydroxy-rich hydrazone-based COFs.
  • To investigate the catalytic activity of these COFs post-synthetically incorporated with Cobalt(II) ions.
  • To explore their application in size-selective cyanosilylation of aldehydes.

Main Methods:

  • Synthesis of two distinct hydroxy-rich hydrazone-based COFs in pure water.
  • Post-synthetic incorporation of Cobalt(II) ions into the COF structures.
  • Evaluation of the catalytic performance in the cyanosilylation of various aldehydes, assessing size selectivity.

Main Results:

  • Successful synthesis of two novel hydrazone-based COFs in an environmentally friendly aqueous medium.
  • Demonstration of Lewis acid catalytic activity by the Cobalt(II)-incorporated COFs.
  • Exhibition of significant size selectivity in the cyanosilylation of aldehydes, indicating tailored catalytic performance.

Conclusions:

  • The synthesized hydroxy-rich hydrazone-based COFs represent a valuable addition to the limited variety of COFs.
  • The Cobalt(II)-functionalized COFs show promising Lewis acid catalytic capabilities.
  • The observed size selectivity opens avenues for developing advanced catalysts for specific organic transformations.