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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

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,...
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...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...

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Silicon Nanowires and Optical Stimulation for Investigations of Intra- and Intercellular Electrical Coupling
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Molecular junctions based on intermolecular electrostatic coupling.

Zhiwei Yi1, Stefan Trellenkamp, Andreas Offenhäusser

  • 1Institute of Bio- and Nanosystems (IBN 2), Research Center Jülich, 52425 Jülich, Germany.

Chemical Communications (Cambridge, England)
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Researchers studied the electrical conductance of individual ferrocene molecules linked electrostatically. They found the conductance was lower than for similar molecules linked covalently, offering insights into molecular electronics.

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Area of Science:

  • Molecular electronics
  • Electrochemistry
  • Nanotechnology

Background:

  • Ferrocene derivatives are promising for molecular electronic devices.
  • Understanding charge transport through single molecules is crucial for advancing nanoelectronics.

Purpose of the Study:

  • To investigate the conductance of electrostatically linked ferrocene molecular junctions.
  • To compare the conductance of electrostatically linked versus covalently linked ferrocene systems.

Main Methods:

  • Assembly of electrostatically linked ferrocene junctions using an electrochemical mechanical break junction technique.
  • Measurement and analysis of single-molecule conductance via conductance histograms.

Main Results:

  • Successfully assembled and measured the conductance of individual ferrocene junctions.
  • Observed conductance peaks at multiples of 3.4 × 10(-5) G(0).
  • Found that electrostatic linkage results in approximately one order of magnitude lower conductance compared to covalent linkage (cysteamine-ferrocene-cysteamine).

Conclusions:

  • Electrostatically linked ferrocene junctions exhibit significantly lower conductance than covalently linked ones.
  • The study provides valuable data for designing molecular electronic components based on ferrocene.
  • Findings highlight the impact of linkage chemistry on charge transport in single-molecule junctions.