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

IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

1.4K
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
1.4K
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

1.9K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.9K
Resonance02:52

Resonance

65.0K
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
65.0K
Network Covalent Solids02:18

Network Covalent Solids

16.1K
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...
16.1K
Metallic Solids02:37

Metallic Solids

20.6K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.6K
Types of Chemical Bonds02:37

Types of Chemical Bonds

94.1K
Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O. 
94.1K

You might also read

Related Articles

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

Sort by
Same author

Jahn-Teller Distortions in Pseudo-Octahedral Low-Spin Ni(III) Complexes With O,O or N,N Bidentate Ligands: A DFT Study.

Journal of computational chemistry·2026
Same author

<sup>1</sup>H NMR chemical shift as an index of UV-vis absorption/emission maxima in aromatic dyes.

Physical chemistry chemical physics : PCCP·2026
Same author

Comprehensive Modeling of Acetone Clusters: QTAIM Analysis and QCE Study.

Journal of computational chemistry·2026
Same author

Comparative Review of <i>O</i>,<i>O</i>'-, <i>N</i>,<i>O</i>-, and <i>N</i>,<i>N</i>'-Bidentate Ligands: Structural and Electronic Properties of β-Diketones, Enaminones, and β-Diketiminates.

Molecules (Basel, Switzerland)·2026
Same author

Donor-Acceptor Pentacene Analogues With Near-Infrared Emission and Tunable Aromaticity.

Angewandte Chemie (International ed. in English)·2026
Same author

Metal-centered X-ray absorption and emission spectroscopy of iron corroles: implications for ligand non-innocence.

Chemical science·2026

Related Experiment Video

Updated: Jan 27, 2026

Introducing Shear Stress in the Study of Bacterial Adhesion
13:28

Introducing Shear Stress in the Study of Bacterial Adhesion

Published on: September 2, 2011

16.2K

Norcorrole as a Delocalized, Antiaromatic System.

Jeanet Conradie1,2, Cina Foroutan-Nejad3, Abhik Ghosh4

  • 1Department of Chemistry, UiT - The Arctic University of Norway, 9037, Tromsø, Norway. conradj@ufs.ac.nz.

Scientific Reports
|March 21, 2019
PubMed
Summary

Nickel norcorrole molecules appear antiaromatic magnetically but have symmetrical structures. This is due to stable dipyrrin fragments within the norcorrole ring system, explaining the conflicting properties.

More Related Videos

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
10:22

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T

Published on: January 16, 2021

5.9K
Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C UV-C Damage
12:59

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C UV-C Damage

Published on: February 15, 2020

6.7K

Related Experiment Videos

Last Updated: Jan 27, 2026

Introducing Shear Stress in the Study of Bacterial Adhesion
13:28

Introducing Shear Stress in the Study of Bacterial Adhesion

Published on: September 2, 2011

16.2K
MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
10:22

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T

Published on: January 16, 2021

5.9K
Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C UV-C Damage
12:59

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C UV-C Damage

Published on: February 15, 2020

6.7K

Area of Science:

  • Inorganic Chemistry
  • Computational Chemistry
  • Quantum Chemistry

Background:

  • Norcorroles are macrocyclic compounds with unique electronic properties.
  • Antiaromaticity is a property where cyclic molecules exhibit destabilization due to specific electron counts.
  • Nickel complexes are widely studied for their catalytic and electronic applications.

Purpose of the Study:

  • To investigate the structural and electronic properties of nickel norcorrole.
  • To reconcile the magnetic criterion of antiaromaticity with the calculated molecular structure.
  • To understand the electronic contributions of the dipyrrin fragments to the norcorrole system.

Main Methods:

  • High-quality Density Functional Theory (DFT) calculations were employed.
  • Magnetic criteria were used to assess aromaticity.
  • Fragment Molecular Orbital (FMO) analysis was performed.

Main Results:

  • Nickel norcorrole exhibits a symmetric and delocalized structure.
  • No significant bond length differences were observed between adjacent Cmeso-Cα bonds.
  • The magnetic criterion indicated strong antiaromaticity, contrasting with the calculated structure.

Conclusions:

  • The observed structural symmetry in nickel norcorrole is attributed to the high stability of its dipyrrin fragments.
  • Dipyrrin fragments maintain their electronic and structural integrity within the norcorrole ring.
  • This stability explains the discrepancy between magnetic antiaromaticity and the molecule's delocalized structure.