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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
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,...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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...
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Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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Long-range repulsive interaction between molecules on a metal surface induced by charge transfer.

I Fernandez-Torrente1, S Monturet, K J Franke

  • 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.

Physical Review Letters
|November 13, 2007
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Molecular electron donors form superlattices on gold surfaces due to electrostatic repulsion. This long-range repulsion, driven by charge accumulation, dictates molecular spacing on metal surfaces.

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Area of Science:

  • Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding molecular adsorption on metal surfaces is crucial for designing advanced electronic and catalytic materials.
  • The behavior of molecular electron donors on metal surfaces can be complex, influenced by intermolecular interactions and substrate electronic properties.

Purpose of the Study:

  • To investigate the adsorption behavior and intermolecular interactions of molecular electron donors on a gold(111) surface.
  • To elucidate the driving forces behind the observed superlattice formation.

Main Methods:

  • Scanning Tunneling Microscopy (STM) was used to characterize the adsorption structure and molecular pair distributions.
  • Density Functional Theory (DFT) calculations were employed to understand the electronic properties and interactions of adsorbed molecules.

Main Results:

  • Spontaneous superlattice formation of molecular monomers was observed, with molecules spaced several nanometers apart.
  • Coverage-dependent pair distributions revealed a long-range intermolecular repulsive potential, inversely proportional to molecular separation.
  • DFT calculations indicated charge accumulation in the molecules due to electron donation into the gold substrate.

Conclusions:

  • Electrostatic repulsion between adsorbed molecules is a persistent phenomenon on metal surfaces.
  • The observed superlattice structure is a direct consequence of these long-range repulsive forces, influenced by electron donation into the metal.