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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
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Topology Switching in Polymetallic Fragments Governed by Metal Encapsulation.

Niklas Geue1,2, Kim Greis3, Hari R Newnham2

  • 1Institute of Chemistry and Biochemistry, Freie Universität Berlin, Altensteinstraße 23a, Berlin 14195, Germany.

Journal of the American Chemical Society
|June 25, 2026
PubMed
Summary
This summary is machine-generated.

We developed a gas-phase method to control the structure of metal assemblies. Encapsulating metal ions within a chromium ring directs the formation of specific metallosupramolecular structures, enabling targeted synthesis.

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Area of Science:

  • Supramolecular Chemistry
  • Coordination Chemistry
  • Mass Spectrometry

Background:

  • Metallosupramolecular assemblies offer potential in extraction, catalysis, and recognition.
  • Current solution-phase synthesis methods for these complexes are often difficult to control.
  • Directed assembly of complex metallosupramolecular structures remains a challenge.

Purpose of the Study:

  • To introduce a novel gas-phase approach for controlling the topology of polymetallic complexes.
  • To investigate the influence of guest cation identity on the assembly structure.
  • To enable the targeted synthesis of specific metallosupramolecular architectures.

Main Methods:

  • Utilized ion mobility mass spectrometry (IM-MS) for analyzing gas-phase complexes.
  • Employed density functional theory (DFT) calculations to support experimental findings.
  • Investigated host-guest complex formation via collision-induced dissociation (CID).

Main Results:

  • Demonstrated gas-phase synthesis of metallosupramolecular assemblies by encapsulating metal cations within a {Cr8} ring.
  • Showcased topology switching (ring, host-guest, or open chain) based on the guest cation's identity.
  • Successfully produced distinct polymetallic fragments with controllable topologies.

Conclusions:

  • The gas-phase encapsulation method provides precise control over metallosupramolecular assembly topology.
  • This approach facilitates the targeted synthesis of novel polymetallic rings, host-guest complexes, and open chains.
  • The findings offer valuable insights into the stoichiometric and conformational preferences of these assemblies.