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Electron Transport Chains01:28

Electron Transport Chains

The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Selection Rules: Thermal Activation
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Characterization of Thermal Transport in One-dimensional Solid Materials
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Temperature-Dependent Electron Transport in Single Terphenyldithiol Molecules.

T Grellmann1,2, D Mayer1, A Offenhäusser1

  • 1Peter Grünberg Institute (PGI) and JARA-FIT Fundamentals of Future Information Technology, Forschungszentrum Jülich , D-52425 Jülich, Germany.

The Journal of Physical Chemistry. A
|April 5, 2017
PubMed
Summary

Electronic properties of terphenyldithiol (TPT) molecules show a surprising shift in charge transport mechanism with temperature. Elastic tunneling dominates at low temperatures, transitioning to inelastic hopping above 100 K.

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Area of Science:

  • Condensed matter physics
  • Molecular electronics
  • Quantum transport

Background:

  • Understanding charge transport mechanisms in single molecules is crucial for developing molecular electronic devices.
  • Terphenyldithiol (TPT) is a linear, symmetric aromatic molecule with potential applications in molecular electronics.

Purpose of the Study:

  • To investigate the temperature-dependent electronic transport properties of individual terphenyldithiol (TPT) molecules.
  • To identify the dominant charge transport mechanism in TPT across a range of temperatures.

Main Methods:

  • Utilized cryogenic mechanically controllable break junctions (MCBJ) for precise control over molecular junctions.
  • Measured the electronic conductance of single TPT molecules at temperatures ranging from 30 K to 300 K.

Main Results:

  • Observed a distinct change in the charge transport mechanism around 100 K.
  • Elastic tunneling was the dominant mechanism at low temperatures (below 100 K).
  • Inelastic transport, specifically hopping, became dominant at higher temperatures (above 100 K).
  • The work function and molecular energy level of TPT remained temperature-independent.

Conclusions:

  • The study reveals an unusual temperature dependence of the charge transport mechanism in TPT molecules.
  • This finding aligns with theoretical predictions and experimental observations for similar short, rodlike molecules.
  • Highlights the importance of temperature in dictating charge transport pathways in molecular junctions.