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Related Concept Videos

Intermolecular Forces03:13

Intermolecular Forces

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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...
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Intermolecular vs Intramolecular Forces03:00

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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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Intermolecular Forces in Solutions02:28

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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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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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Intermolecular Forces and Physical Properties02:56

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Bacterial Immobilization for Imaging by Atomic Force Microscopy
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Quantitative assessment of intermolecular interactions by atomic force microscopy imaging using copper oxide tips.

Harry Mönig1,2, Saeed Amirjalayer3,4, Alexander Timmer3,4

  • 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Münster, Germany. harry.moenig@uni-muenster.de.

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Atomic force microscopy (AFM) now offers stable imaging for organic compounds. A new copper oxide tip (CuOx tip) overcomes previous limitations, enabling precise bond length determination and analysis of intermolecular bonds.

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Area of Science:

  • Surface Science
  • Chemical Physics
  • Nanotechnology

Background:

  • Atomic force microscopy (AFM) is crucial for resolving organic compound bonding structures.
  • Traditional AFM probe passivation using weakly bound molecules (e.g., CO, Xe) causes image distortions and inaccurate bond length measurements.
  • These limitations hinder reliable interpretation of molecular structures and bonding.

Purpose of the Study:

  • To introduce a novel, structurally stable tip passivation method for AFM.
  • To enable accurate quantitative determination of bond lengths and bond order effects.
  • To facilitate reliable characterization of intermolecular bonding and hydrogen bonds.

Main Methods:

  • Development and application of a copper oxide tip (CuOx tip) for AFM.
  • Verification of the oxygen-terminated Cu tip through indentation into oxidized copper substrates.
  • Utilizing the stable CuOx tip to image organic compounds at the molecular level.

Main Results:

  • The covalently bound oxygen atom in the CuOx tip provides high structural stability.
  • Achieved quantitative determination of individual bond lengths and bond order effects.
  • Provided conclusive experimental evidence for an unusual intermolecular N-Au-N three-centre bond.
  • Demonstrated characterization of hydrogen bond strength and configuration within molecular assemblies.

Conclusions:

  • The CuOx tip overcomes limitations of traditional AFM passivation, enabling precise molecular imaging.
  • This stable AFM probe allows for accurate analysis of complex intermolecular interactions.
  • The findings pave the way for more reliable interpretation of chemical bonding in organic systems.