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Related Concept Videos

Intermolecular Forces03:13

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...
Intermolecular Forces03:13

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...
Network Covalent Solids02:18

Network Covalent Solids

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...
Ionic Association01:28

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.
MO Theory and Covalent Bonding02:40

MO Theory and Covalent Bonding

The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

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Self-association based on orthogonal C=O...C=O interactions in the solid and liquid state.

Christoph Fäh1, Leo A Hardegger, Marc-Olivier Ebert

  • 1Laboratorium für Organische Chemie, ETH Zürich, Hönggerberg, HCI, CH-8093 Zürich, Switzerland.

Chemical Communications (Cambridge, England)
|December 22, 2009
PubMed
Summary

Researchers discovered a novel network of carbonyl-carbonyl interactions in a difluorocyclopentanone derivative. This finding demonstrates self-association driven by weak dipolar forces in nonpolar solvents, confirmed by NMR spectroscopy.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Crystallography

Background:

  • Carbonyl groups (C=O) are fundamental functional groups in organic chemistry.
  • Weak intermolecular interactions play crucial roles in molecular self-assembly and material properties.
  • Understanding non-covalent interactions is key to designing functional organic molecules.

Purpose of the Study:

  • To investigate the potential for orthogonal C=O...C=O interactions in organic molecules.
  • To explore the self-association behavior of alpha,alpha-difluorocyclopentanone derivatives in apolar solvents.
  • To confirm the presence and nature of these interactions using spectroscopic methods.

Main Methods:

  • X-ray crystallography to determine the solid-state structure.
  • Proton Nuclear Magnetic Resonance ((1)H NMR) spectroscopy to study self-association in solution.
  • Synthesis of an alpha,alpha-difluorocyclopentanone derivative.

Main Results:

  • Identification of a unique network of orthogonal C=O...C=O interactions in the crystal structure.
  • Evidence of self-association in apolar solvents, attributed to these dipolar interactions.
  • Confirmation of weak C=O...C=O interactions driving molecular assembly in solution.

Conclusions:

  • Orthogonal C=O...C=O interactions can facilitate molecular self-association in organic compounds.
  • Difluorination influences the electronic properties and interaction potential of carbonyl groups.
  • This study highlights a new mode of weak interaction for supramolecular assembly in organic chemistry.