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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...
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Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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π Molecular Orbitals of 1,3-Butadiene

Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
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The Buckingham Pi theorem is a valuable method in dimensional analysis, reducing complex relationships between variables into dimensionless terms. Relevant variables in analyzing the lift force on an airplane wing include lift force, air density, wing area, aircraft velocity, and air viscosity. Expressing each variable in terms of fundamental dimensions — mass, length, and time — provides a consistent foundation for constructing these dimensionless terms.
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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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Published on: July 27, 2018

Energy component analysis of π interactions.

C David Sherrill1

  • 1Center for Computational Molecular Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. sherrill@gatech.edu

Accounts of Chemical Research
|October 2, 2012
PubMed
Summary

Symmetry-adapted perturbation theory (SAPT) reveals key insights into noncovalent π-interactions, including cation-π and π-π interactions. SAPT analysis highlights the crucial roles of induction, dispersion, and charge penetration effects in molecular binding.

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Area of Science:

  • Computational Chemistry
  • Molecular Interactions
  • Biophysics

Background:

  • Noncovalent interactions are fundamental to biomolecular structure, solvation, crystal packing, and drug docking.
  • Energy component analysis, including Symmetry-Adapted Perturbation Theory (SAPT), elucidates the contributions of intermolecular forces like electrostatics, dispersion, induction, and exchange-repulsion.

Purpose of the Study:

  • To demonstrate how SAPT provides detailed insights into the nature of noncovalent π-interactions.
  • To analyze cation-π interactions, π-π interactions, and substituent effects using SAPT.
  • To showcase the application of advanced SAPT algorithms to larger biological systems.

Main Methods:

  • Symmetry-Adapted Perturbation Theory (SAPT) for energy component analysis.
  • Application of SAPT to model systems like benzene dimers, benzene-pyridine, and pyridine dimers.
  • Computational studies of larger systems, including DNA intercalation complexes.

Main Results:

  • SAPT reveals that cation-π interactions are driven by strong polarization (induction) effects, even overcoming expected electrostatic repulsion.
  • For π-π interactions, SAPT highlights the significant contribution of London dispersion forces and the importance of charge penetration effects, which can lead to attractive electrostatics.
  • Analysis of substituted dimers and heteroatom-containing systems shows complex interplay of dispersion, exchange-repulsion, and electrostatic effects.

Conclusions:

  • SAPT is a powerful tool for understanding the nuances of noncovalent π-interactions, going beyond simpler electrostatic models.
  • Charge penetration effects are critical in π-stacking interactions, particularly in systems with significant orbital overlap like DNA.
  • Recent advancements allow SAPT computations on large systems, enabling detailed analysis of biomolecular complexes and materials.