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Related Concept Videos

Mass Spectrometry: Aromatic Compound Fragmentation01:23

Mass Spectrometry: Aromatic Compound Fragmentation

Upon ionization, aromatic compounds generate a molecular ion that is observed as a prominent peak in their mass spectra. For example, the molecular ion peak for benzene appears at a mass-to-charge ratio of 78, while toluene is observed at a mass-to-charge ratio of 92. The molecular ion benzene is highly stable and does not readily undergo further fragmentation due to the significant amount of energy required to disrupt the aromatic stability of the benzene ring. In contrast, the molecular ion...
NMR Spectroscopy of Benzene Derivatives01:37

NMR Spectroscopy of Benzene Derivatives

Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling constants depend...
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
Directing and Steric Effects in Disubstituted Benzene Derivatives01:18

Directing and Steric Effects in Disubstituted Benzene Derivatives

When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the more strongly...
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.

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Related Experiment Video

Updated: Jun 2, 2026

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode
09:19

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode

Published on: June 4, 2021

Benzene-pyridine interactions predicted by the effective fragment potential method.

Quentin A Smith1, Mark S Gordon, Lyudmila V Slipchenko

  • 1Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States.

The Journal of Physical Chemistry. A
|April 21, 2011
PubMed
Summary

The general effective fragment potential (EFP2) method accurately models benzene and pyridine dimers, crucial for biological systems. This computational approach shows high agreement with advanced theoretical methods.

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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
07:49

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

Related Experiment Videos

Last Updated: Jun 2, 2026

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode
09:19

NMR-Based Fragment Screening in a Minimum Sample but Maximum Automation Mode

Published on: June 4, 2021

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
07:49

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Biophysics

Background:

  • Accurate modeling of nitrogen-containing heterocycles is vital for understanding biological systems.
  • The general effective fragment potential (EFP2) method offers a computationally efficient approach for molecular interactions.

Purpose of the Study:

  • To evaluate the accuracy of the EFP2 method for modeling benzene and pyridine dimers.
  • To compare EFP2 interaction energies with high-level theoretical data.

Main Methods:

  • Application of the general effective fragment potential (EFP2) method.
  • Comparison with high-level theoretical data including SCS-MP2, SAPT, and CCSD(T).
  • Analysis of potential energy curves and interaction energy components for various dimer configurations.
  • Utilizing EFP2 Monte Carlo/simulated annealing (MC/SA) for potential energy surface sampling.

Main Results:

  • EFP2 demonstrated excellent agreement with CCSD(T) and SCS-MP2 methods for different dimer orientations.
  • Average root-mean-square deviations (RMSD) were low (0.49-0.52 kcal/mol), indicating high accuracy.
  • EFP2 successfully sampled the potential energy surface for benzene-pyridine and pyridine dimers.

Conclusions:

  • The EFP2 method provides a reliable and accurate means to model nitrogen-containing heterocyclic dimers.
  • EFP2 is a viable computational tool for studies in biological systems requiring precise molecular interaction energies.