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Related Concept Videos

π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
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...
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

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 annulenes. In...
Directing Effect of Substituents: ortho–para-Directing Groups01:14

Directing Effect of Substituents: ortho–para-Directing Groups

Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate electrons...
Directing Effect of Substituents: meta-Directing Groups01:09

Directing Effect of Substituents: meta-Directing Groups

Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the ortho, meta, and para...
Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...

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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
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Substituent effects in parallel-displaced pi-pi interactions.

Stephen A Arnstein1, C David Sherrill

  • 1Center for Computational Molecular Science and Technology, School of Chemistry and Biochemistry and College of Computing, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA.

Physical Chemistry Chemical Physics : PCCP
|May 10, 2008
PubMed
Summary
This summary is machine-generated.

Substituents significantly alter pi-pi interactions in benzene dimers by modifying electronic structure. These changes impact electrostatic, dispersion, and induction forces, affecting molecular stacking.

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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Molecular Interactions

Background:

  • Pi-pi interactions are crucial in molecular recognition and materials science.
  • Understanding substituent effects on these interactions is key to designing functional molecules.

Purpose of the Study:

  • To investigate how substituents influence pi-pi interactions in parallel-displaced benzene dimers.
  • To analyze the impact of substituents across the entire potential energy surface.

Main Methods:

  • High-quality quantum-mechanical calculations.
  • Symmetry-adapted perturbation theory (SAPT) to dissect interaction components (electrostatics, exchange-repulsion, dispersion, induction).
  • Second-order Møller-Plesset perturbation theory (MP2) and spin-component-scaled MP2 (SCS-MP2) methods with augmented correlation-consistent basis sets (aug-cc-pVDZ, aug-cc-pVTZ).

Main Results:

  • Substituents markedly alter the electronic structure of the benzene pi cloud.
  • Significant changes in pi-pi interaction energies were observed due to substituents.
  • Direct interactions between substituents and the opposing pi cloud were identified.

Conclusions:

  • Substituents play a critical role in modulating pi-pi stacking interactions.
  • The electronic and direct substituent-arene interactions are key factors determining interaction strength.