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Intermolecular vs Intramolecular Forces03:00

Intermolecular vs Intramolecular Forces

Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Van der Waals Interactions01:24

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...
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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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Use of Microscale Thermophoresis to Measure Protein-Lipid Interactions
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Intermolecular interaction studies using small volumes.

David Bourry1, Davy Sinnaeve, Katelijne Gheysen

  • 1Department of Chemistry, Ghent University, Ghent, Belgium.

Magnetic Resonance in Chemistry : MRC
|December 17, 2010
PubMed
Summary
This summary is machine-generated.

New 1-mm NMR probe technology enables intermolecular interaction studies with minimal sample volumes, significantly reducing protein and ligand consumption for chemical shift perturbation and STD spectroscopy.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Biophysical Chemistry
  • Chemical Biology

Background:

  • Traditional NMR spectroscopy often requires substantial sample volumes and amounts of valuable biomolecules or ligands.
  • Investigating intermolecular interactions is crucial for understanding biological processes and drug discovery.
  • Limited sample availability, particularly for complex ligands, poses a significant challenge in traditional NMR studies.

Purpose of the Study:

  • To introduce and evaluate a 1-mm room-temperature probe for NMR-based intermolecular interaction studies.
  • To demonstrate the feasibility of using small sample volumes (5-10 µl) for chemical shift perturbation (CSP) and Saturation Transfer Difference (STD) spectroscopy.
  • To highlight the economic and practical advantages of this technology for analyzing interactions involving limited or expensive compounds.

Main Methods:

  • Utilized a 1-mm room-temperature NMR probe setup.
  • Employed chemical shift perturbation (CSP) and Saturation Transfer Difference (STD) spectroscopy techniques.
  • Developed an alternative titration protocol involving individual sample preparation for each titration point, suitable for small sample volumes.

Main Results:

  • Achieved successful intermolecular interaction studies using significantly smaller sample volumes (5-10 µl).
  • Demonstrated a substantial reduction in ligand consumption (less than 10% compared to 5-mm probe setups) for titration experiments.
  • Confirmed the effectiveness of the 1-mm probe for studying interactions with limited quantities of complex ligands.

Conclusions:

  • The 1-mm room-temperature probe technology offers a cost-effective and sample-sparing alternative for NMR-based interaction studies.
  • This method enables the investigation of molecular interactions that were previously unfeasible due to sample limitations.
  • The technology has significant implications for drug discovery and the study of natural products or synthetically challenging molecules.