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π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
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Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
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Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
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Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...

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Exploring Protein-Glycan Interactions: Advances in Nuclear Magnetic Resonance
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The cation-π interaction.

Dennis A Dougherty1

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States.

Accounts of Chemical Research
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

The cation-π interaction is a key molecular recognition force, crucial for protein structure, drug binding, and biological processes. Its significant binding energy, comparable to hydrogen bonds, is driven by electrostatics and observed in systems from gas phase to biological environments.

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Area of Science:

  • Chemical Physics
  • Biochemistry
  • Molecular Biology

Background:

  • Cation-π interactions are recognized as a major force in molecular recognition.
  • They are comparable in strength to hydrogen bonds and ion pairs.
  • These interactions are vital for macromolecular structure and drug-receptor binding.

Purpose of the Study:

  • To provide a perspective on the intellectual origins and fundamental nature of cation-π interactions.
  • To highlight the significance of cation-π interactions in various chemical and biological systems.

Main Methods:

  • Review of early cyclophane studies and gas-phase experimental data.
  • Analysis of electrostatic and polarizability contributions to binding energy.
  • Examination of cation-π interactions in protein structures and biological processes.

Main Results:

  • Cation-π interactions exhibit substantial binding energies (e.g., Li+ to benzene: 38 kcal/mol).
  • They remain significant in aqueous and biological conditions, enhancing binding by 2-5 kcal/mol.
  • Electrostatic attraction between cations and the π system's negative potential is the primary driver.
  • Interactions are observed in protein structures (e.g., lysine/arginine with aromatic residues) and biological processes.

Conclusions:

  • Cation-π interactions are a fundamental noncovalent force with significant implications in chemistry and biology.
  • They play critical roles in neurotransmitter-receptor binding, drug-receptor interactions (e.g., nicotine to ACh receptors), and other biological functions.